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TECHNICAL MANUAL

TRAVELING WAVE TUBE AMPLIFIERS(TWTA)

MODELS: A230/240-330/340-350 SERIES

REVC

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LogiMetrics. INC

TECHNICAL MANUAL

TRAVELING WAVE TUBE AMPLIFIERS(TWTA)

MODELS: A2301240-330/340-3S0 SERIES

REVC

Prepared by:

LogiMetrics, .Inc.121-03 Dupont StreetPlainview, NY 11803 USA

Doc: A230SER.C / M089/090Rev A - LED - 09-87Rev B - 240/340 - 05-89RllvC-350 -01-93

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LogiMetricS, INC 12'-OJ OUPONTST. PlAINVIEW. NVlIBOJ • IS16)3"-I700 • Tl060-Bl52 lOGM ETUG • FAX"16-349-9552

Innovation in Instrumentation

QUALITY POLICY

LogiMetrics is a manufacturer of Traveling WaveTube microwave amplifiers and Electronic Systems.LogiMetrics is committed to designing, building andassembling its products to its catalog specificationsand/or to comply with special customer requirements, when specified, conforming to industryquality standards and delivery dates.

bg~~President and CEO

10740210/93

T'NT I\mplili",~ • EMC Suc.Cf'plihilily Sy~I"!Il'5 • EW .In:nming Sysiems

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LogiMetrics. INC

WARRANTY

All LogiMetrics, Inc. products are in warranty against defects in materialand workmanship for a period of one year from date of shipment and, ifproperly used, will perform in full accordance with their applicablespecifications.

Any instrument that proves to be defective during the warranty period willbe repaired, or at our option, replaced without charge. The warranty isvoid if the inspection seals are broken without prior written authorizationfrom the factory. Equipment returned to the factory is to be shippedprepaid by Buyer and will be returned F.O.B. Destination. C.O.D. returnswill not be accepted by our Receiving Department.

No other warranty is expressed or implied. LogiMetrics is not liable forconsequential damages incurred while using its products.

CAUTION

THIS EQUIPMENT SHOULD BE SERVICED ONLYBY QUALIFIED TECHNICAL PERSONNEl.

THE INSTRUMENT CONTAINS HIGH VOLTAGE. EXTREMECARE MUST BE TAKEN TO AVOID COMING INTO CONTACTWITH ANY HIGH VOLTAGE POINT. INJURY ON CONTACT

WITH HIGH VOLTAGE CAN RESULT.

LOGIMETRICS,. Inc., 121-03 Dupont Street, Plainview, NY 11803Printed in USA1'-92

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LogiMetrics. INC

WARRANTY

LIMITED WARRANTY FOR LOGIMETRICS PRODUCTS

1. WARRANTY

a. Equipment components, and subsystems (i.e., "Products"), exclusive of- microwave tubes,manufactured and sold by LogiMetrics, Inc. are warranted to be free of defects in material andworkmanship for a period of one (1) year except as otherwise specified on LogiMetrics quotation oragreed to in writing by LogiMetrics. LogiMetrics' obligation under all warranties is limited in accordancewith the periods of time and all other conditions stated in all provisions of this warranty.

b. This warranty applies only to defects in material and workmanship in products manufactured byLogiMetrics, including non-LogiMetrics parts, except microwave tubes.

c. Microwave tubes, which are supplied as an integral part of LogiMetrics products, are warranted onlyin accordance with the tube manufacturer's applicable warranty. _

d. Power Supplies and passive components which include electromagnets, solenoids, filters,circulators, couplers, waveguides, diplexers, and other passive devices are warranted for one (1) yearof unlimited hours of operation following the date of shipment thereof, unless otherwise specified.

e. Repair, or at LogiMetrics option, replacement of the LogiMetrics product or defective parts thereinshall be the sole and exclusive remedy for all valid warranty claims; provided that under certaincircumstances LogiMetrics may, as an alternative, elect to refund an equitable portion of the purchaseprice of the product.

2. WARRANTY PERIOD

The applicable warranty period shall commence on the date of shipment from LogiMetrics to theoriginal purchaser and extend for the stated period following the date of shipment. The warranty periodfor microwave tubes shall commence on the date of shipment from LogiMetrics and extend for thespecified time period or number of hours of operation in accordance with the terms of the applicableexpress written warranty of the tube manufacturer. Upon beginning of the applicable LogiMetricswarranty period, all customer's remedies shall be governed by the terms stated or referenced in thiswarranty. In-warranty repaired or replacement products or parts are warranted only for the remainingunexpired portion of the original warranty period applicable to the repaired or replaced products or parts.Repair or replacement of products or parts under warranty does not extend the original warranty period.

3. WARRANTY COVERAGE LIMITATIONS

a. The following are expressly NOT COVERED under warranty:

1. Any loss, damage, and/or malfunction relating in any way to shipping, storage, accident,abuse, alternation, misuse, neglect, failure to use products under normal operating conditions or withinrespective LogiMetrics specified ratings, failure to use products according to any operating instructionsprovided by LogiMetrics, lack of routine care and maintenance as indicated in any operating ormaintenance instructions, or failure to use or take any proper precautions under the circumstance.

2. Products, items, parts, accessories, subassemblies, or components which are expendable innormal use or are of limited life, such as but not limited to bulbs, fuses, lamps, glassware, etc.

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LogiMetrics. INC

3. Microwave tubes have a one (1) year warranty from date of shipment from LogiMetrics.

a. At LogiMetrics sole option, it may furnish warranty replacement parts to the customer before thedefective part is returned to and received by LogiMetrics. If LogiMetrics furnishes such parts in advance,the customer understands and agrees that it will return the replaced defective parts to LogiMetrics withinsixty (60) days after LogiMetrics advance shipment. In the event defective parts are not returned andreceived by LogiMetrics with this sixty (60) day period, the advance replacement parts shall be deemednot furnished under warranty and customer agrees to pay LogiMetrics invoices for all such advanceshipment replacement parts at their then current selling prices.

b. LogiMetrics will not make warranty adjustments for failures of products or parts which occur afterthe specified warranted hours of operations or after the specified maximum adjustment period. Unlessotherwise agreed, failure shall be deemed to have occurred no more than seven (7) working days beforethe first date on which a notice of failure is received by LogiMetrics. Under no circumstances shall anywarranty exceed the period stated above unless expressly agreed to in writing by LogiMetrics. In theevent customers and/or users of any LogiMetrics products subject to this warranty fail to keep accuraterecords of the number of hours of operation or time period of use, LogiMetrics, at its sole discretion, mayreject any such claims or determine probable usage for the equipment, component, or subsysteminvolved.

4.· LIABILITY LIMITATIONS

a. THIS WARRANTY IS EXPRESSLY IN LIEU OF AND EXCLUDES ALL OTHER EXPRESS AND IMPLIEDWARRANTIES, INCLUDING BUT NOT LIMITED TO WARRANTIES OF MERCHANTABILITY AND OFFITNESS FOR PARTICULAR PURPOSE, USE OR APPLICATION, AND ALL OTHER OBLIGATIONS ORLIABILITIES ON THE PART OF LOGIMETRICS, UNLESS SUCH OTHER WARRANTIES, OBLIGATIONS ORLIABILITIES ARE EXPRESSLY AGREED TO IN WRITING BY LOGIMETRICS.

b. All obligations of LogiMetrics under this warranty shall cease in the event its products or partsthereof have been subjected to accident, abuse, alteration, misuse or neglect, or which have not beenoperated and maintained in accordance with proper operating procedures.

c. IN NO EVENT SHALL LOGIMETRICS BE LIABLE FOR INCIDENTAL, CONSEQUENTIAL, SPECIAL, ORRESULTING LOSS OR DAMAGE OF ANY KIND HOWSOEVER CAUSED. LIABILITY FOR DAMAGESSHALL NOT EXCEED THE PAYMENT, IF ANY, RECEIVED BY LOGIMETRICS FOR THE UNIT ORPRODUCT OR SERVICE FURNISHED OR TO BE FURNISHED, AS THE CASE MAY BE, WHICH IS THESUBJECT OR CLAIM OR DISPUTE.

d. No action, regardless of form, arrSlng out of, or in any way connected with, the products, orservices, furnished or to be furnished by LogiMetrics, may be brought by the customer more than one(1) year after the cause of action has accrued.

e. Statements made by any person, including representatives of LogiMetrics, which are inconsistentor in conflict with the terms of the warranty, shall not be binding upon LogiMetrics unless reduced towriting and approved by an officer of LogiMetrics.

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LogiMetrics. INC

RETURN PROCEDURES

5. WARRANTY CLAIM

All claims under warranty must be made promptly after occurrence of circumstances giving rise tothe claim and must be received at LogiMetrics within the applicable warranty period. LogiMetricsreserves the right to reject any warranty claim not promptly reported. After expiration of the applicablewarranty period, microwave tubes, power supplies, and components are not subject to adjustment.

6. WARRANTY INFORMATION

When a product is returned for repair and/or adjustment, a full description of the circumstancesgiving rise to the warranty claim should be included. Such information will help establish the cause offailure and expedite adjustment or repair.

7. TRANSPORTATION AND PACKAGING

Any product returned to LogiMetrics for examination must be properly packed and sent prepaid.LogiMetrics reserves the right to reject any warranty claim on any item where seals have been brokenor that has been altered in the field without written LogiMetrics authorization. Returned products shouldbe carefully packaged in the original container, and unless otherwise indicated, shipped to:

LogiMetrics, Inc.101-32 Dupont StreetPlainview, NY 11803Attention: Customer Service

8. AUTHORIZATION FOR EVALUATION

When any product is returned for examination and inspection, or for arty other reason, customerand its shipping agency shall be responsible for all damage resulting from improper packing or handling,and for loss in transit, notwithstanding any defect or nonconformity in the product. By returning aproduct, the owner grants LogiMetrics permission to open and disassemble the product as required forevaluation. In all cases LogiMetrics has sole responsibility for determining the cause and nature offailure, and LogiMetrics determination with regard thereto shall be final. .

If it is found that LogiMetrics' product has been returned without cause and is still serviceable, thecustomer will be notified and the product returned at its expense; in addition, a charge for testing andexamination will be made on the product so returned.

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OPTIO-l-.2D Option 10-1/2 - IEEE-488 GPIBRev O/~age 1 of 6

LogiMetrics TWT Amplifier Operational Instructions

for

Options 10-1 and/or Option 10-2

IEEE-48B General Purpose Interface Bus (IEEE-488 GPIB)

The LogiMetrics Traveling Wave Tube Amplifiers (TWTAs) provide remotecontrol operation via the IEEE-4BB GENERAL PURPOSE INTERFACE BUS, (GPIB),conform to T, L, SH, AH interface functions and all mechanical specifications,as described by IEEE STO 488-1978.

Located on the rear panel of the unit is a 24 pin GPIB connector forelectrical connections to external peripherals and an Address Select Switchused in selecting the amplifier's address.

-If the amplifier is to be controlled from a hot computer via theIEEE-488 GPIB, a standard IEEE-488 cable must be used. An address unique tothe amplifier must be selected and commands issued using the Control Commands.

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OPTI0-1-.2D Option 10-1/2 - IEEE-488 GPIBRev D/Page 2 of 6

I. Address Switch Selection/Command Code

Table 1

IEEE-488, Address Switch (Location Rear Panel), Address 20 Selected

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ADDRESS SELECT

A1 A2 A3 A4 1'.5 BR1 3R2 TESTIOPR

1 2 3 4 5 6 7 8

III III

III

, OFF

III III III 1/1 III

(1) (2)(Binary Code)

(4) (8) (16)

Shaded areas indicate switch depressions.

Example illustrates switch depressions for ADDRESS 20(Binary code 1 + Binary Code 1£ =20)

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.:-logiMetrics, INC

OPTIO-l-.2D Option 10-1/2 - IEEE-488 GPIBRev D/Page 3 of 6

I. Address Switch Selection/Command Code, continued

I COMMAND CODES I DESCRIPTION IRESPONSE COMMANDS:

...PRINT @ 20: PWON, (CR) , (LF) Send power command to ampl ifier.

INPUT @ 20: S$ NOTE 1 Request from amp1i fi er. S5destination string variable forstatus responses.

HP BASjC EXAMPLE USING GPIB-488 INTERFACE:

OUTPUT 720; "PWON" NOTES 3,4 ISend command to amplifier.

ENTER 720; 55 NOTES 3,4 IReturn amplifier status.

STATUS COMMANDS:

PRINT @ 20: COLV, (Cr) , (L f)I

Requests unit to respond withcollector voltage.

WAIT 1 NOTE 2 IINPUT @20: SS NOTE 1 I Command for stri ng vari abl e to

display collector voltage.

NOTES:

l. Address ampl i fi er as talker.

2. Allow unit to process status request.

3. 7 = Address of GPIB card.

4. 20 = Address of LogiMetrics' amplifier.

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; LoglM.etricS.INCoPTl 0- 1- . 20 Option 10-1/2 - I£EE-488 GP1B

Rev D/Page 4 of 6

II. Amplifier Control Commands Status Commands and Responses forStandard 1EEE-488 GPIB

I Table 2 IAmpl ifier Commands I Command Codes I Ampl i fi er Status

Contro7 Command Codes:.POWER OFF , PWOF, (C r) , (Lf) I AC applied, no high vol tage or

Filament voltage.POWER ON (STANDBY) PWON, (Cr) , (Lf) IHi gh voltage app1i ed, time out

s~Quence during war~-up period.RFON (A3 30/340=iE SET)

IRFON, (Cr), (L f)

IRF Power On after waim- up period i scCiilplete.

RESET (.D.3 30/3 40 NotI

RSET , (Cr) , (L f)I

Resets instruments if fault occurs.Valid)

I Diagnosis r ' Codes (with ODtion 22 HITAs On7y):L.ommana

I COlL~CTOR VOL T.~GE I COlV (Cr). (L f) I Ou~puts Coll ector Voltage.HELIX VOLTAGE I HLXV, (C r) , (Lf) I Ou~puts H~lix Voltage.HELIX CURRENT I HLXT, (C r) , (Lf) \ Outouts Helix Current.

I RF ?OWER OUT (WAITS) I PWRW, (Cr) , (Lf) I Outputs OU~Dut Power in Watts.RF ?OVJ::R OUT (d3m) I P'n'RD, (C r) , (L f) I OutDuts Out Jut Power in dBm.**CATHODE VOL ~.~G~ I CT;-;V, (Cr) , (Lf) I OU:Jut s r -, ,

Vol~age.l..a~nOGe

**C.::."THODE CURR~N"T I CTnT, (Cr) , (Lf) I OutDuts Cathode Voltage**:)~ pml~R OUT (. I r.-- -) I FPWT, (C;') , (Lf) I Ou:pu"':.s ou;';:lut P8vler Watts"r \YI.-\:I,)

I **RF POYER OUT (03) I r-~nr"'\ (Cr), (L f) I Outputs OutDut ?ower d3mr, "":::.,

STATUS RESPONSES FROM TWTAContro7 Responses I Amp7ifier ConditionPOW::R OFF I AC aDplied, NO high voltage or 'filament va ltage. :

N1P TIMINGI

Warm-up period after filament has. been a;:Jplied.(Typically 180 seconds) .

STANDBY IA~plifier is warmed up, ready to apply into "RFON"mode.

RFON I High voltage applied - TRANSMIT mode.

FAULT RESPONSE*THERMAL FAULT TWT Thermal Overload.*COLLECTOR OVERCURRENT TWT collector Current Overl Dad.*HELIX OVERCURRENT TWT Helix Current Overload.SYNTAX ERROR Syntax error.* Certain amplifiers ONLY, otherwise "FAULT"**P-BAND ONLY

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·".1ogiMetrics. INC.,

OPTlO-l- .2D Option IO-1/2 - IEEE-488 GPIBRev D/Page 5 of 6

III. Amplifier Control Commands, Status Command 2nd Responses forC1 I L/MATE Forma

I Table 3 IAmpl i fi er Commands I C1 IL Codes

POWER OFF I RST SGC :CHO, (Cr), (L f)

POWER ON (STANDBY) I FNC SGC :CHO SET GAIN 50 SET VLST, (C r) , (Lf)RFON I FNC SGC :CHO SET GAIN 50 SET VLON, (C r) , (L f)

RESET RST SGC :CHO (C r) , (Lf)OPEN (Disables Remote IOPN :CHO, (Cr ), (Lit

RFON)CLOSE (Enables Remote

ICLS :CI10, (C r) , (Lf)

RFON)

I STATUS RESPONSES FROM T'rITA II Function I CIlL (Response) I Comment

I?OhIER OFF

I(sp) (cr) (1 f) I :!;C 2~Dl 2d no high voltage. No

rii=.:nen vo haoe.

IAt'iP i~HING

IF06TWiP-,: Ai·\P iIHING

I~:2.i:;]- ~p ~eriod ar:er Filamenthas Jeen 2Dplied.

STANDBYI

(sp) (Ci ) (l f)I.~mplifi2r is wariaed up, readyfor t rar.s;;,it -.nr::>

IIIU"";_ •

R~ON I (sp) (c r) (1 f)I

:-i~=h \.'al~=~e ap~lied tra:lsmitii1oce.

II r/iULT RESPONSES I"'IH::;:(~i.!l,L FAULT

IF07TWi;:, :

ITWT -h - Overload.I eriT,c: I

THRI·\ JVERLOAD"'COLLECTOR OVERCURRENT

IF07TWTA: I T'WT Colle:tor Current Overload.

COll OVERCURR::NT*"-1 L" I jV OVERCURRENT

IF07T\oiTA: I TWT Helix Current Overload.I.IL. _ .. 1\

HELX OV::RCURR::NT I

SYNTAX ERRORI

F07T'Wifl,:I

Syn:2.x error.SNTX ERROR

**SOL/FIL FAULT N/A I Solenoid/Filament Fault**CAIH OVERCURRENT I N/A IIWT Cathode Current Overload**THRM OVERLOAD N/A TWT Thermal Overload**VS\o!R OVERLOAD N/A VSVJR Overload*Certain amolifiers ONLY, otherwise "FAULT".**P-BAND ONLY

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.' ... lpgiMetrics. INC

" OPTI0-1-.2D Option 10-1/2 - IEEE-48B ~PIB

Rev D/Page 6 of 6

I Tabl e 4 II REMOTE TERMINAL SytrTAX FOR 1£££-488 (OPTION 10-1/2) AND R5232 (OPTION 10-3) I

I Item I Function I Syntax

1 I Power On I "PWON"

2 I Power Off I "PWOF"

3 I RF ON I "RFON" II 4 I Ampl i fi er Fault Reset I "RSET"

5 I Status ... I "STA"

6 I Standby I "PWON"

I Table :J II STATUS -1NFORP'IATI ON FOR 1£::E-488 (OPTiON 10-1/2) AND RS232 (OPT! ON 10-3)

Item I Status' I Description

1 I Po\·,'E:R O~- I " ,. -. in ?O\.,fEK OFr condition.ir :-.mpI1Tler

2 I .~Jl PLI F1ER "TIMiNG I iwo '? ) ioiinu"te i','a rm- up condH. ion 2.7-::'er POW~R ON.\-

3 I ST.!l.NDBY I .!:.:iiDiifier in Si.::';W3Y condit ion f ..... _ ... transmitting) . I\ ; I:.J i..

4 I R::ON I Ali1~lifier t;G~s;::i~t;ng.

:- I SYN"Tf:..X ER?OR I Inv2.1id comr;;anc stri;)g sent by :=:iio't.e t eri;i1 it a1 .

I 7<:J I 3E.';M CURRENT I 3e2.;n current ove;load a;npllj'"~er 7"ault.

* i I DUTY CYCLE I Duty cycle amDlifier fault.I

* 8 I PWS/TWT "THERMAL I Power supply and TWT therr.,al ampli7ier fault.

I * I I fault.r

9 WAVEGUIDE PRESSURE Waveguide pressure amplifier7<10 I .A, IR FLOW I A. i rfl ow amplifier faul t.*11 I VSWR FA,ULT I VSWR ampl i fier fault.

12 I PARITY ERROR I RS232 ONLY (Option 10-3).13 I FRAME ERROR RS232 ONLY (Option 10-3).

14 I OVERRUN ERROR RS232 ONLY (Option 10-3).*Provided with A710/A750 Ampl i fi ers.

-15-

LogiMetrics. INC

A230SER.TC Technical Manual/A230/240-330/340-350 SeriesPage i

TABLE OF CONTENTS

iJ; ..L .

Paragraph Title

SECTION 1. INTRODUCTION

1.0 Introduction1.1 Scope of Manual1.2 Purpose and Use of the Equipment1.3 General Description1.4 Equipment Specifications

SECTION 2. OPERATION

Page

iiI

1-1,!

1-1 ,i

1-1 II':·

1-1 ,

1-1

2.02.12.22.32.42.5

3.03.13.23.2.13.2.23.2.33.33.43.53.63.73.83.8.13.8.23.8.33.93.10

3.10.13.10.23.10.33.10.4

OperationGenera1InstallationOperating ProceduresOperating Controls, Indicators and ConnectorsConnection and Preliminary Operation

SECTION 3. THEORY OF OPERATION

Theory of OperationGenera1Traveling Wave Tube (TWT)DC OperationRF OperationCharacteristics of Traveling Wave Tub~s

RF BlockPower Supply TheorySwitching and Inverter Circuits A1A2HV and Control Assembly A1A4Collector and Helix SuppliesFaultsCollector FaultThermal FaultHelix FaultSwitch/Interface Assembly, Theory of OperationCentral Processor Unit, (CPU) Assembly,

Theory of OperationSerial InterfaceGPIB ControllerBuffers, Drivers and TransceiversOn-Board Address Decoders

2-12-12-12-12-12-2

3-13-13-13-13-13-33-53-63-63-73-83-83-83-93-93-9

3-153-153-153-153-17

i...

iI

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LogiMetrics, INC

A230SER.TC Technical Manual/A230/240-330/340-350 SeriesPage ii

Paragraph

4.04.14.1.14.1.24.24.34.4

5.05.15.25.3

6.0

TABLE OF CONTENTS (Cont'd)

Titl e

SECTION 4. MAINTENANCE

MaintenanceAssembly and Disassembly ProceduresRemoval of CoverRemoval of Traveling Wave TubeTest and Alignment ProceduresRequired EquipmentHV Test

SECTION 5. TROUBLESHOOTING DIAGRAMS

Troubleshooting DiagramsRequired EquipmentTop Cover RemovalTroubleshooting Diagram Index

SECTION 6. DRAWINGS - SCHEMATICS, ASSEMBLIESAND PARTS LIST

Drawings - Schematics, Assemblies and Parts List

4-14-14-14-14-14-24-4

5-15-15-15-1

6-1

-17-

LogiMetrics. INC

A230SER.TC Technical Manual/A230/240-330j340-350 SeriesPage iii

Figure Dwg. No.

TABLE OF CONTENTS (Cont'd)

Title

2-12-22-1A2-2A3-13-23-33-4

3-53-64-14-24-3A4-3B5-1

Table

104628A230/A330ACOI

130006A240/A340ACOIA230/A330AC03A230/A330AC04

Text107214

TextA230/A330AC02A230/A330AC05A230/A330AC06A230/A330AC08A230/A330AC09

Text

Outline &Installation TWT AmplifierOperating Controls, Indicators &ConnectorsOutline Drawing Model A240/A340Operating Controls, Indicators &ConnectorsSimplified Block Diagram of TWT AmplifierInput/Output Characteristics of TWTRF Block DiagramSchematic Amplifier Interface and Switch

Circuit (LED) A610/PI/O Port DescriptionFunctional Block Diagram, CPU AssemblyResistive Load NetworkText Fixture for HV TestTypical RF Measurement Test SetupNoise Power TestHV Testing and Troubleshooting

Title

2-52-62-72-83-23-43-5

3-103-123-164-54-64-114-125-24

1-11-21-32-1

A230/240 Series TWTA 1-2A330/340 Series TWTA 1-4A350 Series TWTA 1-6Operating Controls, Indicators &Connectors - 2-3Front Panel

-18-

LogiMetrics, INC

A230SER.Cl Technical Manual/A230/240-330/340-350 SeriesRev C/Page 1-1

Section 1. INTRODUCTION

1.0

1.1

Introduction

Scope of Manual

1.2

Th is techn i cal manual cant ains instruct ions for the use andmaintenance of Model A230/240 Series, Model A330/340 Series and Model A350Series of Traveling Wave Tube Amplifiers (TWTA) (herein referred to as ModelTWTA) manufactured by LogiHetrics, Inc., Plainview, New York USA. This manualincludes a general description of the amplifier, operating instructions,theory of operation, maintenance, schematics, parts list and wire list.

Purpose and Use of the Equipment

The LogiMetrics Model TWTA is used to amplify microwave signals.

The Model TWTA can be used with most microwave signal generatorsand modulators. Typical uses are general laboratory equipment to increasedynamic range measurements and as part of radar and communication systems.

1.3 General Description

The Model TWTA is a self-contained compact instrument suitable forbench or rack use. This amplifier consists of a panel, a chassis, and dustcovers. The panel serves as a mounting for the controls, connectors, andmonitoring meter. The dust covers enclose and protect the internal componentsof the equipment. Kits to rack and mount the amplifiers are optional.

1.4

Models:

Equipment Specifications

The following describes equipment specifications for the following

Table 1-1.Table 1-2.Table 1-3.

A230/240 Series TWTAA330/340 Series TWTAA350 Series TWTA

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Logi1\1etrics. INC

THIS PAGE INTENTIONALLY LEFT BLANK

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TABLE 1-1A230j240 SERIES TWTA

MEDIUMPOWERAMPLIFIERSA230/240 SERIES10WATTSCW1.0-18.0 GHz .

• General laboratory Instrumentation

• System Preamplifiers

• Threat Simulation

• Antenna Patterns Testing

• Component Testing

• EMC Susceptibility Testing

• Communications

Optionally, the TWTA's can be suppliedwith complete input and output VSWR '"protection. These medium power lWTAs r··are compact and lightweight making them L:ideal for bench operation or rack mounting.

r:!":

r

standard IEEE-488 GPIB. Each amplifierfeatures complete regulation of the helix,filament, and grid power supplies, thusproviding stable operation and long life forthe lWTs. The TWT is fully protectedagainst power supply malfunctions suchas helix overcurrent.

~;:;;'!":I=4_

• Monitor-Digital DisplayStandbyFaultsHelix Voltage/CurrentCollector VoltagePower Out (option 30) in Watts anddBm

• Mode- Digital DisplayPower On/OffRFOn

• ControlsPower OnPower OffRFOnRFOff

LocaI Select

• Ease of Maintenance

• Designed to meet the safetyrequirements of IEC-348 andUndeJWriters laboratory of AmericanStandards

• Broadband Coverage

The l.cgimetrics 3.5" high A230 series andthe 525" high A240 series of medium pcl'Nermicroprocessor based instrumentation andsubsystem amplIfiers provide the user withproven reliable instrumentation for a widevariety of test and system applications.

The operating modes are selectable via frontpanel push button controls and the operatingmode is displayed on an LED digital display.Additionally, salient power supply voltages,OJrrents and fault indicators can be displayed.

Each amplifier is remote controllable via the

LogiMetrics, Inc.

-21-

LogiMetrics, Inc. l"age !-,)

(6) NOT TO EXCEED lAIR IN,1----- 22.50 --~~.

OVEFlAU. LENGTH I I

RFINPUTRFOUTPUT

a:~a:

o

[AJROUTe-<

16.S0[ : .. ~AIR IN-

'::.-AiR IN

19.00

-AIR IN..,

TABLE 1-1 (Contld)

C=6IllIIIDJ AlAIN

RF INPUT

IIRFOUTPUT

...z

)0II:u.

DllIJ]]] AIR IN

=SERIES A

A230 3.50"A240 525"

DIMENSIONS IN INCHES

A230/240 SERIES

Warranty: One full year from date of shipment non-prorated forboth the 1WT and power supply. - -

Model Frequency Min Min MaxNumber Range Pwr Sat NF

(GHz) Out" Gain"(Watts) (dB) (dB)

r: A230 SERIES-FULL RACK 3.50" HA230/L 1.0-2.0 10 30 35A230/S 2.0-4.0 10 30 35A230/C 4.0-8.0 10 30 35A230/X 8.0-12.4 10 30 35A230/U 12.4-18.0 10 30 35A230/IJ 6.0-18.0 10 30 35

A240 SERIES-FULL RACK 525- H

A240/L 1.0-2.0 10 30 35A240/S 2.0-4.0 10 30 35A240/C 4~0-8.0 10 30 35A240/X 8.0-12.4 10 30 35

. A240/U 12.4-18.0 10 30 35A240/1J 6.0-18.0 10 30 35

"Higher output power and gains available

Spurious: -40dBc (-5OdBc available)IniOut Impedance: 50 Ohms

-,". IniOut VSWR: 2.5:1 MaximumResidual AM: 1% Maximum (-4OdBc)(3)RF Connectors:

Frequency Input Output1.0-18.0 GHz Type N TypeNLocation: Front Panel Front Panel

Air ExhaustRear Panel

38 pounds maximum (17.3 kg)38 pounds maximum (17.3 kg)

Intemal Forced AirAir Intake IRear Panel

3.50" (88.9mm)Hx16S (419mm)Wx20.5"(521mm)D Rack Mount (4)5.25" (133mm)Hx16S (419mm)Wx20S(521 mm)D Rack Mount (4)

Option 15Option 18Option 22Option 30

Option 08Option 09Option 12Option 13Option 14

Option 04-XX Altemate Prime Power (2)Option 07 Input Pin Diode Pulse Modulator with 40dB

isolation; 15ns rise/fall timesIntegral Output Circulator (1)Integral Input Isolator (t) .RF sample of the output (~3OdBc) (1)Chassis Slides for 19" Rack MountingIntemal Preamp for rated power @ less than 0dBm inputInput Attenuator; 20dB Range (1)RF InputlOutput Connectors on the Rear PanelIntemal System Diagnostics ;RF Output Power displayed on Digital FrontParlel display (1)

Other options available (2)NOTES(1) Option may IffOld rated output power and gain(2) CorrsuIt factory tor flatures and other Iunc:lions(3) Typically -40dBc AM; ·5SdBc FJ.t(~) Add Z' te de¢llor 1.: 8cndSpeciflc:ations subfect te cnanqe withQut noliot

Weight:A230 Series:A240 Series:Cooling:

A240 Series:

Dimensions:A230 Series:

Standard: Operating mode control and status monitoring via"IEEE-488 GPIB.

mwmm;i.i=Sl?;j~~~:;j&_aOperating Temperature: 0-50'C (4O'C @ 10,000 Feet)Relative Humidity: 95% (noncondensing)Operating Altitude: 10,000 feet maximumNonOperating Temp.: -20 To 70'CNonOperating Altitude: 50,000 feet maximum

{.\.I ,';!,!, ; )h! t,., ~np!>~-:-i#!@}j§k~~.· -~....,_:""~~;r---.-..21'"'2B·~tm

Switchable 115 or 230 VAC, ±lO%,Single Phase, 50-400 Hz, 750 VA maximumSwitchable 115 or 230 VAC, ±lO%, SinglePhase, 50-60 Hz,750 VA maximum

A.240 Series:

A230 Series:

!.-:-

. 121-03 Dupont Street. Plainview, New YorK '1803, U.s.A. • (516)349-1700. TWX: 7608152 LOGMETUC· FAX: (516)349-8552

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LogiMetrics, Inc. Page 1-4

L..- ['---_

I\

TABLE 1-2A330/340 SERIES TWTA

MEDIUMPOWERAMPLIFIERS

A330/340 SERIES20WATTSCW1.0-18.0 GHz

f;

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• EMC Susceptibility Testing• Communications• General Laboratory Instrumentation• System Preamplifiers• Threat Simulation• Antenna Pattems Testing• Component Testing


• Mode- Digital DisplayPower OnlOffRFOn

• ControlsPower OnPower OffRFOnRFOffLocal Select

• Ease of Maintenance• Designed to meet the safety

requirements of IEC-348 andUnderwriters Laboratory of AmericanStandards

• Broadband Coveragy

i.I~:;,.:;:"_i1l~I,!~_wiE~ f-

The logimetrics 3.5" high A330 Series and filament, and grid power supplies, thusthe 5.25" high A340 Series of medium power providing stable operation and long fife formicroprocessor based instrumentation and the TWTs. The TWT is fully protectedsubsystem amplifiers provide the user with against power supply malfunctions suchproven reliable instrumentation for a wide as helix overcurrent.variety of test and system applications.The Optionally, the T'NTAs can be suppliedoperation mcdes are seledable via front with complete input and output VSWRpanel push button controls and the operation protection. These medium power TWTAsmode is displayed on an LED digital display. are compact and lightweight making them i,-'Additionally, salient power supply voltages, ideal for bench operation or rackc:urrents and fault indicators can be mounting. [,displayed.

Each amplifier is remote controllable via thestandard IEEE-488 GPIB. Each amplifierfeatures complete regulation of the helix,

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LogiMetrics, Inc. Pa e 1-5


TABLE 1-2 (Cont 1d)

C=:>()]]lIlI) AIR IN

0 RFINPUT

IIRFOUTPUT

~z

I0a:u..

0IIlIIIl AIR IN

=. .j

""~"'I

:~ 1.48

-~..,

00

(6) NOT TO EXCEED .AIR IN----- 22.50 ! !

OVERALL LENGTH

11--__ (6) 20.50 AIR IN I I \- 1.50

1 ~

,•

'=-AIR IN

AlROUT-i ..

6.50c

19.[

AIR IN-;-AIRIN

..

oa:<wa:

RFINPUTRFOUTPUT

SERIES A·A330 3.50·A340 5.25"

A330/340 SERIES

38 pounds maximum (17.3 kg)38 pounds maximum (17.3 kg)Intemal Forced AirAir Intake Air ExhaustRear Panel Rear Panel

Reflected Power Cutoff VSWR Protection (1) (4)A1temate Prime Power (2)Input Pin Diode Pulse Modulator with 40dB Isolation;15ns risetfall timesIntegral Output Circulator (1) (5)Integral Input Isolator (1) (S)RF sample of the output (-3OdBc) (1)Chassis Slides for 19" Rack MountingInternal Preamp for rated power @ less than a inputInput Attenuator. lOdS Range (1)RF Input/Output Connectors on the Rear PanelInternal System DiagnosisRF Output Power displayed on Digital Front PanelDisplay (1)

Other options available (2)NOTES(1) Optlan may ,lied rated output pawti and gain(2) ComuIt f:Icloty tor features and other Iunc:llclOs131 Typially -4SdBc AM: .55dBC FY(-')~ III Models~. J:4OCJ(S) Nor~11 on Model CJ(5) Md r to d8g1l'I for ""\.. BandS4l-:itlt alj",s subjea te change wittlout l'tCIliQ

Option 08Option 09Option 12Option 13Option 14Option 15Option 18Option 22Option 30

Option 03Option 04-XXOption 07

A33OI34O:

WeightA330 Series:A340 Series:Cooling:

Operating Temperature: o.SO>C (40)C @ 10.000 Feet)ReIa1ive Humidity: 95% (noncondensing)Operating Altitude: 10.000 feet maximumNonOperating Temp.: ·20 To 70'C _.NonOperating Altitude: 50.000 feet maxim'um

(.{.!\ilhi;('I~ka)2i ,(.$f-.~-:::Bl~'Ri:J

Dimensions:A330 Series: 3.50· (89mm)HX16.S" (419mm)Wx20S

(521mm)D Rack Mount (6)A340 Series: 5.25" (133mm)Hx16's" (419mm)Wx20S

(521mm)DRack Mount (6)

Standard: Operating mode control and stanJs monitoring viaIEEE-4l38 GPIB.

)::2~Vjii[·'~1\11=~Jl&~'!!!'·~~·"'II:l~·~t!l~'~f·-:'ii"-~·i~~3

OutputTypeNFront Panel

InputTypeNFront Panel

-40dBc (-SOdBc available)so Ohms2..5:1 Maximum1,"0 Maximum (-4OdBc) (3)

Higher outpUt power and gamsavaila.ble

Warranty: One full year from date of shipment non-prorated forboth the TWT and power supply.

121-03 Dupont Street. Plainview. New York 11803. U.S.A. • (516)349-1700· TWX: 7608152 LOGMETUC • FAX: (516)349-8552

PRIMEPOWER= ..... ;.: -<~ .. '- . ".<:; J:,"... ..

A330 Series: Switchable 115 or Z30 VAC. ±10%, SinglePhase. 50-400 Hz. 750 VA maximum

A340 Series: Switchabte 115 or 230 VAC. ::10%, SinglePhase. 50-60 Hi.750 VA maximum

RF Connectors:Frequency1.0.18.0 GHzLocation:

Spurious:In/Out Impedanca:In/Out VSWR:Residual AM:


(GHz) Out" Gain"(Watts) (dB) (dB)

A330 SERIES-FULL RACK 3.50· H

A3301L 1.0-2.0 20 33 35A330/S 2.0-4.0 20 33 35A330/C 4.o-a.0 20 33 35A330/CJ 4.0-4.5 10 30 35

4.5-18.0 20 33 35A3301X 8.0-12.4 20 33 35A3301U 12.4-18.0 20 33 35A3301lJ 6.0-18.0 20 33 35

A340 SERIES-FULL RACK 5.25" H

A3401L 1.0-2.0 20 33 35A340/S 2..Q--4.0 20 33 35A340/C 4.0-8.0 20 33 35A340/CJ 4.0-4.5 10 30 35

4.5-18.0 20 33 35A340IX 8.0-12.4 20 33 35A340IU 12.4-18.0 20 33 35A340IIJ 6.0-18.0 20 33 35

. .

-24-

Il ,

Page 1-6

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TABLE 1-3A350 SERIES TWTA

MEDIUMPOWERAMPLIFIERS

A350 SERIES50WATTSCW4.0-18.0 GHz

L

• General Laboratory Instrumentation

• System Preamplifiers

• Threat Simulation

• Antenna Pattems Testing

• Component testing

features complete regulation of the heHx,filament, and grid power supplies. thusproviding stable operation and long life forthe 1WTs. The TWT is fully protectedagainst power supply malfunctions suchas helix overcurrent.

Optionally. the TWTAs can be suppliedwith complete input and output VSWRprotection. These medium power TWrAsare compact and lightweight making themideal for bench operation or rackmounting.

~2~J(:J·.·,,(..,\~_ I• EMC Susceptibility Testing i -

• Communications

f.'

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I(J~~C> l __

I

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• Mode- Digital DisplayPower On/OffRFOn

• ControlsPower OnPower OffRFOnRFOff

Local Select

• Ease of Maintenance• Designed to meet the safety

requirements of IEC·348 andUnderwriters Laboratory of AmericanStandards

• Broadband Coverage

The Logimemcs A350 Series of mediumpower, linear broadband microwaveamplifiers provide the user with provenreliable instrumentation for a wide varietyof test and system applications.Theoperationa1 modes are selectable via frontpanel push button controls and the opern.tionmode is displayed on an LED digital display.AcXfitionaJIy, salient power supply voltages,currents and fault irxflCatOrS can bedisplayed.

Each amplifier is remote controllable via thestandard IEEE-488 GPIB. Each amplifier

r------------------------------j ,

LogiMetrics, Inc.

-25-

LogiMetrics, Inc. Page 1-7NOT TO EXCEED ,AIR IN

f----- 24.5 -_.:......--'OVERAlL LENGTH I

TABLE 1-3 (Cont'd)

AlROUT-I

I::.-. AIR INRFINPUTRFOUTPUT

a:«wa:

MODEL AA3501C 22SA3501J,lJX 20.5"

o16.50

I

AJRIN-

1-1·,

A AlR IN t I 1_ 1.50

~~I If!!

C::=:::::>lDIl1DJ 1I1A IN

D RF INPUT

IIRFOUTPUT

l-z

Iac:u.

lDIl1DJ AlAIN=..


A350 SERIES

);I#=s=~,:;{>t%~(~I~~~


(GHz) Out· Gain·(Watts) (dB) (dB)

,. A350/C 4.0-8.0 50 40 35A350/1J 8.0-18.0 50 35 35A350/1JX 6.0-18.0 40 35 35

-Higher output power and gains available

hl=,/,t}~ l={JI:;==iJFti't :~?:%l:2~>*}f{ ..~Standard: Operating mode control and status monitoring via

IEEE-488 GPIB.

rnFIim'm}!~~'·1;1§FE&~~~__Operating Temperature: O·SO°C (40°C @ 10,000 Feet)Relative Humidity: 9S% (noncondensing)Operating Altitude: 10,000 feet maximumNonOperating Temp.: -20 To 70°CNonOperating Altitude: 50,000 feet maximum

t3·!\iil,i.(.]1~1:J1:J!(;Jj,'~tiEMiia

A350 Series: Switchable 115 or 230 VAC, ±10%, singlephase, 50-60 Hz, 750 VA maximum

-40dBc (-5OdBc available)50 Ohms2.5:1 Maximum1% Maximum (-4Od8c) (3)

Option 15Option 22Option 30

Option 09Option 12Option 13Option 14

Option 03 Reflected Power Cutoff, VSWR protection (1)Option Q4.XX Alternate Prime Power (2)Option 07 Input Pin Oiede Pulse Modulaor with 40dB

Isolation; 15 ns riselfall times (1)Integral Input Isolator (1)RF sample of the output (-30dBc) (1)Chassis Slides for 19" Rack MountingInternal Preamp for rated power @ less than 0dBm inputInput Attenuator; 20dB range (1)Internal System DiagnosticsRF Output Power displayed on Digital FrontPanel display {1}

Other options available (2)NOTES(1)Option may etIed r.ad DlJlIlUl power and gain(21Consult faacxy tor feaIlnS and other functions(3)TypicaJIy~& AM: -55dSc FMSpecific:alions subject 1I2 d1ange wilhcul nallCll

Air ExhaustRear Panel

OutputType NFrant Panel

InputTypeNFront Panel

5.25* {133mm)Hx1SS {419mm)Wx22.5"{571mm)DRack Mount5.25* {133mm)Hx1SS {419mm)Wx20S{521mm)D Rack Mount38 pounds maximum (17.3 kg)Internal Forced AirAir IntakeRear Panel

WeightCooling:

Dimensions:A350/C:

A3501IJX

Spurious:In/Out Impedance:In/Out VSWR: .Residual AM:RF Connectors:

Frequency4.0-18.0 GHzLocation:

Warranty: One full year from date of shipment non-prorated forboth the 1WT and power supply.

121-03 Dupont Street, Plainview, New Yeri< 11803, U.S.A. (516)349-1700. TWX: 7608152 LOGMETUC • FAX: (5161349-8552

-26-

LogiMetrics. INC

A230SER.C2 Technical Manual/A230/240-330/340-350 SeriesRev C/Page 2-1

Section 2. OPERATION

2.0

2.1

Opera~ion

Genera1

The amplifier is shipped complete and ready to operate; no specialor permanent installation procedures are required. The amplifier should beunpacked upon receipt observing the usual customary precautions when unpackingelectronic equipment.

2.2 Installation

After unpacking the amplifier, plan its installation. Therequired space is shown in Figure 2-1 for the Model A230/240 and Figure 2-1Afor the Model A330/34-0. If the amp1i fier, is to be rack mounted, the rackmounting hardware must be installed. The amplifier requires 115 volts, singlephase 50-60 Hz ACpower.

The amplifier is shipped ready for 115 voltoperation. If the amplifier is to be operatedfrom a 230 Volt source, RESET lfne programmingcard in line Filter Assembly on rear panel,and change fuse to 3 Amp, 230 VAC.

Connect the power cable of the amplifier to an AC receptacle. Ifthe AC receptacle is not a grounding type, use an adapter and connect thegreen lead to ground.

2.3 Operating Procedures

The operating procedures for the Model TWTA are described inparagraphs 2.4 and 2.5.

2.4 Operating Controls, Indicators, and Connectors

The operating controls and indicators of the amplifier are locatedon its front panel, and their functions are listed in Table 2-1 and shown inFigure 2-2 and Figure 2-2A.

-27-

LogiMetrics. INC


2.5 Connection and Preliminary Operation

To operate the amplifier, proceed as follows:

a. Connect the RF OUTPUT connector to a 50 ohm load. The TWTsproduce a saturated power output in excess of the nominalvalue. Check data sheet supplied with unit and use a loadwith a continuous rating in excess of the equipment's fullpower output.

CAUTION

THE TWT USED IN THE AMPLIFIER CAN BE PERMANENTLYDAMAGED IF THE AMPLIFIER'S RF OUTPUT IS NOTPROPERLY TERMINATED. ALWAYS RETURN THE RF POWERSWITCH TO THE OFF POSITION WHEN CHANGING THE RFLOAD. THIS PRECAUTION SHOUlO BE OBSERVED EVEN 'IFNO RF POWER IS ApPLIED TO THE RF INPUT CONNECTOR.

b. Connect a signal source to the RF INPUT having the requiredfrequency range, power level, and impedance.

c. Depress AC line switch to ON position and LCL (LOCAL switch)on front pane~l.

d. Depress PWR ON swi-tch and allow the unit to warm-up. Thiswarm-up period is timed automatically in the unit and uponcompletion will indicate STANDBY on the LED display.

NOTE

The time delay circuitry will automaticallylock out any of the other operating circuits.It is suggested that the RF ON switch not bedepressed while the unit is timing out.

e. Depress the RF ON switch. The LED display will indicate anRFON condition indicating that the TWT is in operating conditionand the precautions on the RF OUTPUT termination should beobserved even if RF signal is not present in the RF INPUTconnector.

,

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-28-

logiMetrics. INC


Table 2-1Operating Controls, Indicators &Connectors - Front Panel

i,.L.

Fig 2-2 &. 2-2AIndex No.

1

2

3

4

6

7

Control Indicatoror Connector

Line Power

Power ON

Power OFF

RF ON

LOCAL

TWT Monitors:(Standar~)

a. Helix Current

b. Helix Voltage

c. Collector

d. RF Power(Watts)

e. RF Power (dB)

Function

Controls the application of ACpower and illuminates to indicatethe AC power applied toamplifier.

Controls the application offilament power to the TWT andinitiates timing circuitry.

Controls the removal of allsupplies from the TWT and resetsthe warm-up timer.

Controls the application of thehigh voltage power supplies tothe TWT (Transmit mode). 5 RFOFF. Remove the high voltage(except filament) from the TWT(No Transmit in Standby).

Places amplifier in LOCAL mode ofoperation. Illuminates toindicate local operation. Whenunit is in external computercontrolled mode, the LOCAL switchwill not be illuminated. Unitmay be brought into localoperation by depressing the LOCALswitch at any time duringoperation.

Displays the actual TWT helixcurrent on the LED display.Displays the actual TWT cathodevoltage with respect to ground.Displays the actual TWT collectorvoltage. Voltage with respect toground.Displays the RF output in Watts.

Displays the RF output power indBm.

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LogiMetrics. INC


Table 2-1 (Cont'd)Operating Controls, Indicators &Connectors - Front Panel

Fig 2-2 &2-2A Control IndicatorIndex No. or Connector Function --

8 RF Input Connector A connector for applying the RF-. signa1 input.

9 RF Output Connector A connector for applying the RFsignal output to a load.

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3.0

3.1

Section 3. THEORY OF OPERATION

Theory of Operation

Genera1

This section contains a simplified description of the operatingprinciple of a microwave amplifier. The microwave amplifier is composed of aTraveling Wave Tube (TWT) and its associated power supplies. The TWT andpower supplies are connected as shown in Figure 3-1.

3.2 Traveling Wave Tube (TWT)

The Traveling Wave Tube (TWT) is a device for amplifying microwavesignals. It is characterized by wide instantaneous band widths, high gain,and high dynamic ranges. The TWT consists of an electron gun, a grid (orgrids), a helix structure, and a collector located in a magnetic structure.These are arranged as shown in Figure 3-1.

3.2.1 DC Operation

Electrons leaving the electron gun are accelerated through thehelix structure to the collector by the high voltage from the power supplies.This electron beam is focused by the external periodic permanent magnetstructure into a fine beam. Very few electrons strike the helix structure;most electrons pass through the helix and strike the collector element.Typically, the collector cu~rent is greater than 90% of the cathode current.The kinetic energy of the beam is dissipated in the collector structure asheat, and care must be taken to properly cool this structure.

3.2.2 RF Operation

I

I::' When an RF signal is applied to the input of the helix structure,it causes alternately accelerating and decelerating electric fields along thehelix structure. Electrons passing through the helix will either speed up orslow down, depending on which part of the field they are in. Electrons thatare slowed down meet with el ectrons that are accel erated by the precedingfield. Therefore, the input RF signal interacts with the electron beam,causing it to bunch up. This process grows exponentially as the beam travelsthrough the helix and the amplitude of the RF wave associated with the bunchedelectrons increases. This amplified RF wave is coupled to the RF Outputconnector of the TWT. The length of the travel ing wave tubes usuallyincreases for higher gain tubes and decreased with increasing frequency (orshorter wave lengths).

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A230SER. C3

Technical ~anual/A230/240-330/340-350 SeriesRev C/Page 3-2

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3.2.3 Characteristics of Traveling Wave Tubes

The input/output characteristic is shown in Figure 3-2. The smallsignal region is characterized by linear operation, low intermodulationproducts, and low harmonic generation. The saturation region is characterizedby maximum power output, high intermodulation products, and harmonicgeneration. The gain of a TWT is usually 6 to 8 dB lower at saturation thanthe small signal gain, and decreases further in the overdrive region. Forthis reason, a TWT is usually operated in the small signal region or up to themaximum output point. The saturated power for a TWT is specified to maintainthe minimum gain specification.

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A230SER.C3

Technical Manual/A230/240-330/340-350 SeriesRev C/Page 3-4

SATURATIONOUTPUT

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RF INPUTCONN~CTOR

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LogiMetrics. INC


3.3.1 The RF input cable is connected to a small gain preamp and theoutput of the preamp is connected to the RF input of the TWT and the output ofthe TWT is then connected to the input of a circulator and load combination toprotect the TWT from excessive external VSWR.

3.3.2directionalconnector.

Port 2 of the circulator is then connected to the input of a 30 dBcoup1er, the output of wh i ch is connected to the RF output

3.3.3 The coupled port of the coupler is connected to a DC block, theoutput of which is connected to a 20 dB attenuator, the output is connected toa detector. The output of the detector is then connected to the RF monitorcircuit on the interface assembly. The signal is processed to provide displayof RF power in Watts or dBm. I

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3.4 Power Supply Theory

The following paragraphs (3.4.1 through 3.9) should be read inconjunction with the schematics contained in Section 6 of this manual.

3.4.1 AC (line voltage selectable) is fused and filtered by the inputconnector-filter assembly AIJI. The AC power is applied to AIT1 andrectifier-capacitor network, through main switch AISl, on the front panel.The connections to the bridge capacitor network, whichever AC line voltageselected, will prOVide approximately 300 VDC for the sWitching regulator.

3.4.2 Outputs from the transformer are appl ied to thesecondary/auxil iary switching assembly AIA2 where they are rectified andfiltered and post regulated by three various terminal regulators to provide:

1. Separate isolated +12 VDC (for the switching and invertercircuits), a +15 VDC (for the preamp and fan).

2. A (+)12 VDC and a (-)12 VDC at ground potential (for thecontrol and monitoring circuitry), and an isolated +5V supply(for all the logic circuitry), [interface and microprocessorassemblies.]

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A separate isolated secondary from AITI is applied to the filamentsupply (part of the HV Assembly) AIA4 where it is rectified, filtered,switched and post regulated to approximately 6.3 VDC which will be at cathodepotential.

3.5 Switching and Inverter Circuits AIA2.

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A230SER.C3 Technical Manual/A230/240-330/340-3S0 SeriesRev C/Page 3-7

control s the pul se wi dth of the output of U13. An i nh i bit si gna1 is alsoprovided from the HV Control Assembly AIA4. This inhibit signal (currentlimited) is series connected to AIA2U7, AIA2U8, AIA2U9, AIA2UIO opto-couplersand prevents any si gna1 input to FET driver IC s AIA2U8 and AIA2U7, and theoutputs of AIA2U12 drives opto-couplers AIA2U9 and AIA2UIO.

When a power on signal is commanded into the HV Control AssemblyAIA4 from the Interface Control Board AlAI, the filament circuit AIA4, throughan opto-~oupler, is turned on (operation of this circuit will be discussed inparagraph 3.6) and the inhibit signal is removed allowing the drive signal tofeed the inverting FET transistors. Since there is no applied voltage to AIT2and source of these transistors, (The switching regulator is held off with theinhibit and slow start signals). After warm-up timing has been completed andRFON has been commanded, the signal will arrive to AIA2QS to allow the slowstart (minimum pulse width to maximum until the feedback signal takes controlof the pulse width) to come up.

AIA2Ql with AIA2CR4, AIA2L2, AIA2C3 and AIA2C4 are connected as asWitching regulator and apply voltage to the inverter circuit. The choppedsignal is then applied to AIT2. The AIT2 steps up the voltage which is thenfed back through a divider to AIA2Ul3 for regulation.

3.6 HV and Control Assembly AIA4

Input commandi from the interface assembly are current sources toAIA4U12 opto-coupler. The power on function output of AIA4Ul2 is inverted byAIA4U16 which in turn drives AIA4QS PNP transistor via anti-bounce circuitconsisting of parts of AIA4Ul6 and AIA4UlI which in turn drives AIA4Q4, AIA4Qland AIA4Q2 to provide the inhibit signal. The output of.AlA4U12 also drivesAIA4U7, and in turn AIA4U16 hex inverter with open collectors to drive theAIA4U14 fi ber opt i c dri ver. The opto rece i ver AIA4U15 is connected to aDarl i ngton pair of trans i stors AIA4Q6 and AIA4Q7 to pass an unregul atedvoltage from the filament bridge rectifier and filter cap to AIA4U17 SVregulator. AIA4U17 in series with 2 diodes AIA4CR18 and AIA4CR19, provide theapproximately 6.3 VDC regulated filament voltage.

The RF ON/RESET function output pf AIA4U12 is inverted by AIA4U7E,and AIA4U78 and is also applied to the input of AIA4U88. The leading edge ofthe output of AIA4U7E is used to clock (reset) AIA4U9A or B if they werepreviously latched by a fault. The output of AIA4U78 on the trailing edge (RFOFF) with discrete components trigger AIA4U19A (4 second timer), the output ofwhich is applied to AIA4U8B. This insures that there is a 4 second intervalbetween RF OFF and RF ON in case of microprocessor control or computer controlmalfunction.

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LogiMetrics. INC


3.7 Collector and Helix Supplies

One AIT2 secondary is applied to a HV bridge rectifier AIA4CRI toAIA4CR4 and is filtered by AIA4Cl and AIA4C2 with bleed resistors AIA4R2 andAIA4R3. In series with the (+) output of this supply is a resistor zenerdiode network with a fiber optic driver AIA4Ul. This network emits a faultsignal if the collector current exceeds approximately 150 rnA. The output ofthis network is supplied to the TWT collector. The negative side of thissupply is supplied to the cathode of the TWT and is connected to the negativeside of the helix supply by isolating resistor AIA4R13 and two HV resistordivider strings, one from the (+) if the collector supply and one from thecathode end of this supply. The output of these dividers drive current drivercircuits AIA4U2, A and 8 then go to the interface assembly for processing anddisplay of helix and collector voltages.

The other AIT2 secondary is applied to a voltage doubler circuitAIA4CR5, AIA4CR6, AIA4C6, and AIA4C7 with bleeder resistor AIA4R19 andAIA4R20. The negative of this supply is applied to isolating resistor AIA4R13and resistive HV divider AIA4R14, AIA4R15 and AIA4R24 which is compared to areference level set by trimmer AIA4R51. The error signal is amplified by andcompensated by AIA4U3 circuitry. The output is used as the feedback signal tocontrol the pulse width of AIA4U13 of the Auxiliary Switcher Assembly (A2).

The positive side of the voltage doubler circuit is feed throughAIA4R21 to a low resistance resistor divider. The voltage generated by thecurrent through this divider is compared to reference levels for a slow(normal level) current trip and a fast (high level) current trip comparitors(low level AIA4U4A, high level AIA4U5) to sense excessive current possiblydrawn by the TWT. AIA4U48 is also connected to this divider and is connectedto provide current drive to the interface assembly for processing the helixcurrent display.

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3.8.1

Faults

Collector Fault

Collector Fault (overcurrent) creates an optical signal fromAIA4Ul into AIA4UI3. The output of AIA4U13 drives through AIA4U7C to AIA4UBA,then to AIA4U9A and drives inhibit circuit for shutdown. AIA4Ul3 output alsopresets AIA4U9B "0" Flip-Flop. "Q" output of AIA4U9B goes to AIA4UI6. Thisoutput will drive an opto-coupler on the interface' assembly for statusi ndi cat ion. The "Q" output of AIA4U9A through AIA4U8B sets up a slowstart/inhibit signal and thereby latching off the high voltage. The "Q"output of AIAU9A is "RED" with the output of AIA4Ul6B via AIA4CRl4 to drivethe inhibit circuit into inhibit mode during any fault.

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LogiMetrics. INC


3.8.2 Thermal Fault

Thermal fault is derived from a thermal sensitive switch that ismounted in the TWT and connected via AIA4J6, AIA4U7E inverts this signal, thisoutput is appl ied to input of NORGATE AIA4U8A, and as with the collectorfault, the slow start/inhibit circuit shuts down the high voltage.

The output of AIA4U7E is also applied to AIA4UI6. This outputwill drive an opto-coupler on the interface assembly for status indication.

3.8.3 Helix Fault

The resistor network from the helix supply (+) to ground is usedto sense the current drawn from the helix supply. The slow fault section isslowed by a long time constant RC network, the output is applied to the (-)input of an op amp AIMU4A. The (+) input of AIA4U4A is connected to apotentiometer AIA4R52 which can be set, so that the trip will occur at apredicted safe current level (max). AIA4U4A output pulls down the (+) inputof AIA4U5 comparitor, which drives the inhibit drive circuit as well as toAIA4U7D input. The output of AIA4U7D is then applied to one input of NORGATEAIA4U8A and as previously described sets up a slow start/inhibit signal latch,as well as a status drive to the Interface Assembly. The fast (high currentsurge) is sensed the same as the slow ci rcuit, but without the slow timeconstants and is set up to a higher level of current for tripping. A pulsestretching network is connected in the ci rcuitry surroundi ng AIA4U5, tocompensate for the quickness of the spike;

3.9 Switch/Interface Assembly, Theory of OperationReference: Schematic, Dwg. No. 106401, Rev. J

Interfac~and Switch Circuit, 330/IJ

The foll owi ng numbered paragraphs correspond to the numberedblocks on the SWitch/Interface schematic Dwg. No. 106401. The p~ragraphs arebroken down to: Function Title; Inputs; Outputs and Description of Function.

L Function Title - I/O Port Decoding

Inputs - High order address bus, IORQ

Outputs - Port addresses 00-07 and IX (See Figure 3-4 for portdescriptions.

Description ,- Ul and U2 are 74LS138, 3 to 8 1inedecoders/demultiplexers. U1 receives the 4 MSBs of theaddress bus and outputs 1 of 8 possible decode lines whichyield the most significant digit of the port number, in thiscase it outputs a decode at Ul-15 which corresponds to A12-A15low ("0") or port number OX. U2 in turn receives the lowerorder address bits to yield the least significant digit of theport number (e.g., U2-12 is low when A15-A8 are as follows:00000011 or hex 03) ..

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LogiMetrics. INC


2. Function Title - Amplifier Control Port (03)

Inputs - Data bus, Decode 03 WR (wrlte)

outputs - 8 control lines for various amplifier functions(See Figure 3-5 for bit-by-bit breakdown.)

Description - U4 is an octal O-type Flip~Flop~ depending onthe state of the data bus when decode 03 is low ("0") and onthe rising edge of the WR (write) pulse the output lQ-8Q latchaccordingly. U3 is an open collector-high voltage outputinverter which commands other amplifier assemblies.

·3. Function Title - Amplifier Status Port (01)

Inputs - Decode 01, RD (read), various amplifier statuses(See Figure 3-5 for description) decode 01, RD (read).

Outputs - Status onto data bus.

Description - U5 is a tri-state output octal latch, whichreceives various amplifier status at its inputs, 10-80, andlatches it onto data bus when decode 01 is low on the risingedge of the RO (read) pulse.

4. Function Title - Timer

Inputs - TMR STR, (U20-2) TMR RST (U20-4)

Outputs - AMP TMG (U20-3)

Description - U20 is a 555 timer used as a presettable, 2minute one-shot. When the amplifier is commanded to POWER-ON,it requires a warm-up period and not until the warm-up periodis over, can high voltage be applied to the amplifier tube.This output (U20-3) is applied to the amplifier status portwhere the software monitors it for completion.

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LogiMetrics. INC


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II/O PORT DESCRIPTION

# D7 06 05 D4 D3 D2 01 00

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01 SUM/HlX THRM Call FAULT SWITCH AMP PWR PWRFlT FlT FlT INT INT TMNG WATTS READ

DB

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03 TMR TMR lCl MUX MUX RFON PWR ON WRITESTRT STOP RST AO Al CMD CMD

04 INTERRUPT WRITERESET

05 DISPLAY WRITEDATA

06 DISP DISP DISP SWITCH WATTS DB WRITER/W RS DE RST lED lED

07 MONITOR FAULT WRITETRIGGER

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5. Function Title - Interrupt Latch

Inputs - Sum Fault, Switch Interrupt

Output - RST 7.5

Description - The software which supports this assembly isinterrupt driven that is on the occurrence of certain events(e.g., switch closure or ampl ifier fault). The main bodyprogram is interrupted to handle such an event. U9 which isan R/S latch is set by an amplifier fault @ U9-1 or a frontpanel switch closure @ U9-5. These 1atched outputs areapplied to US system status port and U18. U18-8 goes to theRST 7.5 1ine of the 8085 CPU on the CPU Assembly, itinterrupts the main body program. The fi rst step in theinterrupt routine is to look at the system status port anddetermi ne whether it was an amp1ifi er fault or a switchclosure.

6. Function Title - Fault Receiver

Inputs - Sum/Hlx Flt, Thermal Flt, Coll Flt.

Outputs - TTL level version of above signals

Description - I.C.'s U21 and U22 are dual _opto-couplers usedto isolate the faults coming from the amplifier. The optocoupl ers convert an open call ector output to a 0-5V TTLcompatible signal. The faults are coded as such: Sum/Hlx Fltis a negative going pulse, if the Interface Assembly receivesonly this pulse then the amplifier has a Helix Fault. IfThermal Flt is active with this pulse, then the amplifier hasa thermal fault. Likewise, if both Sum/Hlx Flt and Call Fltare active then there is a.collector fault.

7. Function Title - "Watch Dog" Timer

Inputs - Decode 07.

Outputs - Relay open or relay close (Monitor Flt)

Description - U23, an LS123, is a retriggable one-shottriggered by the 07 decode from U2-7. The software generatesa 07 decode on a periodic bases while the program is running.this decode keeps the output of U23 timing at can active low,inverted at U3, therefore no current through the coil of Kl,yielding the output normally close. If the program were tostop running, the user of the amplifier would be alerted by anopen at the Monitor Flt signal.

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LogiMetrics. INC


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8. Function Title - Amplifier Parameter Samples

Input - Det RF Power, Coll Voltage, Helix Voltage, HelixCurrent

Output - Scaled versions of the above from 0-5V.

Description - Ull is an inverting amplifier with gain andoffset adjustments to convert the approximate voltage of 0 to-100 mV from the RF detector to a voltage of 0, to U12.A, Band C are buffer ampl ifiers which converts the floatingsamples of the amplifier power supply to referenced voltage ofo to +5V.

9. Function Title - Analog-to-Digital Conversion

Inputs - Parameter Samples; Call Voltage, Helix Voltage, HelixCurrent and Detected Video, MUX Address.

Description - U13, an AD7502, is an analog multiplexer whichselects one of the four amplifier parameters to be Converted.The Multiplexer is addressed by two-bits from U4 when thecorresponding switch on the front panel is depressed. U14 isan ADC0804 8-bit analog-to-digital converter. Conversionbegins on the software issuance of WR (write) pulse and afteran approximate conversion time of 100 usee, the convertedvoltage may be read via port 02. A precision reference isappl ied at U14-9 to establ ish· a scale factor.

10. Function Title - Front Panel Switch Controller

Inputs - Summed Switch Closure, Switch Depressions Outputs LED drive lines.

Description - The following circuit description will bewritten for one switch example, but applicable to all. Ondepression of S7 (PWR ON), simultaneously a closure to groundgenerates a summed switch closure pulse at U18-6 and sets U174. The closure pulse generates an interrupt and the interruptroutine will read port 00 (U15) and detect that U15-8 (U17-4)is set, therefore the software will execute a PWR ON routine.Part of the PWR ON routine will provide drive to the PWR ONswitch LED at UI0-9. -

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A230SER.C3 Technical Manual/A230/240-330/340-350 SeriesRev C/Page 3-1S

3.10 Central Processor Unit, (CPU) Assembly, Theory of Operation

The CPU Functional Block Diagram is shown in Figure 3-6. The8085A Central Processor Unit (CPU) executes GPIB and serial driver routines,processes interrupts, and executes general system software. It is capable ofdirectly accessing 64K of memory, and 256 I/O ports. The 808SA is driven bya 6.144 MHz clock. It can process interrupts from virtually any source on theinterface bus, IEEE 488 bus, or the two serial ports.

The on-board ROM memory is a single PROM socket that can hold 2K,4K, or 8K of EPROM or PROM. PROM's and EPROM's with only 24 pins are alwaysinstalled away from pins 1, 2, 27 and 28 at socket position UI0. The PROMsocket is memory mapped starting at location 0000. The 8085A CPU jumps tothis starting location on power-up. lK of the RAM is provided on-board forscratchpad and program development.

3.10.1 Serial Interface

The WD82S0 serial communications interface (J5) prOVides all thehardware to generate synchronous or asynchronous serial communications. TheWD8250 also provide MODEM control signals. The WD8250 is mapped onto the CPUI/O system and requires eight ports to access ten on-chip registers. Thesecond serial port, called the DEBUG port, is implemented by the 808SA CPUSerial In and Serial Out lines. Also part of J5.

3.10.2 GPIB Controller

The GPIB controller provides all the hardware to control the IEEE488 bus. The controller is also mapped onto the CPU I/O system and requireseight ports to access thirteen on-chip registers. The GPIB controller may beprogrammed to control up to fifteen addition devices or instruments. Thecontroll er may also be programmed to be a GPIB Tal ker/Li stener.

3.10.3 Buffers, Drivers and Transceivers

The CPU Assembly' is fully buffered at every I/O and memoryinterface. Every accessible line on the Interface bus (J2 &J3) connector isproperly buffered to meet the drive and isolation requirements for normal busexpansion. Both serial ports are buffered with RS-232C drivers for true +/-12Volt serial communications. The GPIB signal is buffered with IEEE 4888standard three-state transcei vers, capabl e of dri vi ng fi fteen more GPIBdevices. The GPIB drivers may be used in open-collector mode.

Jl supports the GPIB. LogiMetrics provides a cable, which plugsinto the 24 pin rectangular connector Jl at the card side and a GPIB panelmount connector.

LogiMetrics prOVides a rear panel switch to select addresses andaddressing modes.

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3.10.4 On-Board Address Decoders

The address decoders put the on-board PROM starti ng at memorylocation 0000. On power-up and reset, the CPU begins executing at the firstPROM location. The lK RAM is located at 3COOH to 3FFFH. The TMS 99l4A GPIBcontroller is mapped at I/O ports 30H to 37H. The DIP switch is read at port34H. The TMS 99l4A allows this location to be used for an external addressport. The WD8250 serial controller is mapped at I/O ports 38H to 3FH.

The CPU (A3), Front Panel Interface Board (AlAI), and the DisplayBoard (AIDSl) are interactive and require extremely sophisticated testequi pment to debug an troubleshoot. Fi el d maintenance of these assembl i esshaul d be done on a board 1eve1 bas is. The fo 11 owi ng 1i st descri bes thesymptom and the recommended board to be replaced.

Board Number Symptom Corrective Action

AlDSI Amplifier operational on Replace Display Boardboard local and remotecontrols, but no display.

AlAI Operation via computer, Replace Interface Boardbut no local controlpanel.

A3 No operation from 1oca1 Replace CPU Boardcontrol panel nor computercommands.

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Section 4. MAINTENANCE

4.0

4.1

4.1.1

4.1. 2

Maintenance

Assembly and Disassembly Procedures

Removal of Cover

Removal of Traveling Wave Tube

a) Disconnect RF cables connected at TWT J1 and J2and voltage connector J3.

b) Remove four (4) Philip head screws attaching 1/4 inch rightangle heatsink from collector end of TWT. Remove four (4)socket head screws connecting 1/4 inch heatsink from main aircooled heatsink.

c) Loosen two (2) socket head screws from both ends of TWT.Carefully slide TWT off heatsink. Reinstallation is reverseof this procedure.

NOTE: Install fresh thermal compound one (1) milthick when installing the TWT.

4.1.3 To remove A1A2, Auxiliary SWitching Assembly, remove top cover onbottom of chassis. Remove three (3) Philip screws, then detach three (3)connectors on board and remove.

Reinstallation is reverse of this procedure.

NOTE: All P.C. boards, TWTs and other accessoriesshould not be repaired in the field, but sentback to manufacturer for evaluation and/orrepairs.

4.2 Test and Alignment Procedures

(Ref. Auxiliary Switch, Dwg. #106389 &HV, Dwg. #106392)

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A230SER.C4

4.3 Required Equipment


I Equipment I Number IDigital Multimeter 2

HV Probe Calibrator 1

Resistive Load Box 1

Variac 10 Amp 1

Current Probe 1

0-300 VDC Supply @ 3A Capacity 1

Test Fixture 1

4.3.1 With no power applied, measure leakage resistance from AIA2C9 (t)and AIA2C9 (-) to chassis also drain (case of AIA2Ql) to chassis more than orequal to 10 megohms. Measure from (t) case of AIA2Q2 to (-) case of AIA2Qlapproximately 20 kilohms. Measure from (t) AIA2C9 to (-) AIA2C9 approximately50 kilohms.

4.3.2 Remove plug from AIA2, AIA2J3. Remove plug from AIA4J2. Connecttest fixture into AIA4J2. Remove plug from AIA4J3 and connect resistor loadbox to AIA4J3.

NOTE: Line voltage selection is for 115V operationand a 6.25 amp fuse is in place. Apply ACinto input power connected through variac(turned down). On front panel, place SIinto the "ON" position. Monitor (t) andt-) 12V supplies, pin 2 and 6 to pin 1 GNDof AIA2Jl across AIA2CI0 and AIA2Cll.Monitor each of the isolated +12V supplies.

4.3.3 Monitor t15V supply across input to preamp on assembly AI. Presetall potentiometers to approximately 10 turns from CCW end position.

4.3.4 Slowly increase variac setting, making sure that these voltagesregulate and are within tolerance.

All: 12V +/- O.3V15V +/- O.3V

NOTE: Operation of fan, circulating air frominside to out.

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4.3.5 With oscilloscope, check output of A1A2U12, pins 11 and 14.

At least a lOV squarewave signal at approximately 30 kHz rate withapproximately 45% duty cycle (+ signal to period).

Inhibit signal A1A4E8 from either emitter of A1A4Q1 isapproximately (-)11 VDC.

4.3.6 With oscilloscope, note no drive at gate to source of A1A2Q2 andAIA2Q3 (across) AIA2VR6 and A1A2VR7). A1so note emitter of AlA2Q4 is atapproximately ground potential and that there is no drive to A1A2Q1 (acrossAlA2VR9) .

4.3.7 Check that there is no fil ament vol tage across 5 ohm lOW loadresistor (resistor load box) or from pin 1 to pin 2 of A1A4J3.

4.3.8 On test fixture, place POWER ON switch to the ON position.

NOTE: Approximately 6.3V filament supply is nowon. With oscilloscope, note gate drive toAlA2Q2 and A1A2Q3.

Inhibit signal reads approximately +12 VDC AIA4E8. At positiveend of helix supply, junction (AIA4R21) 470 ohm, (A1A4R43) 390 ohm, and(A1A4R39) 3.9K, inject a positive voltage 0-10 VDC monitoring the current intothis network set at 5 mAo Adjust (A1A4R49), so that the meter on the testfixture monitoring the helix current will read approximately 33% of full scale(.033A).

NOTE: Selector switch set to helix current (I)metering.

4.3.9 Adjust helix slow current trim potentiometer A1A4R52 fullyclockwise, increase input voltage (0-10 VDC) until 12 rnA {consult TWT datasheet} of current is being supplied. Adjust trim potentiometer A1A4R52counter clockwise until helix/sum fault just occurs and is indicated on thetest fixture.

NOTE: Inhibit signal A1A4E8 is approximately -10 VDC.Reduce input voltage to zero.

4.3.10 With an oscilloscope, monitor gate drive on AIA2Ql.fixture, place RF ON switch to the RF ON position. Note: Fault{reset} inhibit signal A1A4E8 is at +12V. Slow start signal A1A2Jl,now at logic "0" (OV).

NOTE: Slow start of drive signal to gate of AIA2Q1from minimum pulse width to maximum. Withpotentiometer A1A2R9, set maximum pulsewidth to 60% {at approximately 60 kHz}.

On testclearingpin 4 is

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4.3.11 Short AIA4TPI to ground E9 (effective input to AIA4U4). Increaseinput current to 40 rnA. St AIA4R53 CCW until helix/sum fault is justindicated. Remove input current.

NOTE: Inhibit signal AIA4E8 emitter approximately-lOY and slow start signal at a logic WI"(5V). Remove ground at AIA4TPI. On testfixture, press reset, helix/sum fault shouldbe extinguished.

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4.3.12 At (+) end of collector supply, apply 0-20V supply across (+) toAIA4R4 and AIA4R3 and (-) to AIA4El4 collector output. Slowly increase powersupply and note that the current, the coll ector fault and hel ix/sum faultilluminate is greater than 130 rnA, and less than 160 mAo Select RX (A1A4R81)to adjust this trip.

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4.3.14 With a clip lead, short out (A1A4J6, 1 and 2), thermal fault andhelix/sum fault should light up. Remove short and press reset.

Reduce power supply to zero and press reset on text fixture.4.3.13

NOTE:

NOTE:

Fault indicator extinguishes.

Fault indicator extinguishes.

4.3.15 Inject a -4.75V signal into A1A4U2 Pin 2 and adjust A1A4R30 forhelix metering on test fixture, reads 4KV (.08mA).

NOTE: Selector switch to collector metering.

4.3.16 Inject a -4.75V signal into AIA4U2 Pin 6 and adjust AIAR32 forhelix metering on test fixture, reads 4KV (.08mA).

NOTE: Selector switch to hel ix voltage metering.

4.4 HV TEST

The Resistive Load Network diagram is shown in Figure 4-1 and TestFixture for HV Test diagram is shown in Figure 4-2.

4.4.1 Connect AIA2J3 to HV test fixture. Connect plug from AIA2J3 intoHV Test fixture as shown in Figure 4-2.

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4.4.2

4.4.3

On test fixture, put RF ON switch to RF ON position~

With scope monitor emitter AIA2Q4 (AIA2TP4) to ground.

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4.4.4 Slowly increase variac and monitor cathode potential with HV DCprobe. Continue to increase variac until waveform on scope starts to decreasein pulse width.

NOTE: Cathode potential will start regulating onAIA4 Assembly, adjust AIA4R51 clockwise andincrease variac setting until regulatedvoltage is approximately 3.90 KV. Arc downcathode supply with 100 ohm resistor.Helix overcurrent displayed, press RF ON,measure ripple with high voltage, scopeprobe should be less than 30V p-p.

4.4.5 Measure collector voltage (cathode voltage to GNO minus collectorvoltage to GND) should be minimum -1.8 KV, maximum -2.0 KV.Continue toincrease variac until 320 VDC is across bridge rectifier capacitor network.

NOTE: Meter reading for helix current.

4.4.6 Switch to helix voltage on test fixture. Adjust (AIA4R32) so thatmeter reads .076 rnA (3.8KV). Switch to collector voltage on test fixtureadjust (AIA4R30) so that meter reads nominally .038 rnA (approximately 2KV) tocoincide with collector to ground potential.

4.4.7

4.4.8

Put RF ON switch to RF OFF.

NOTE: HV decreased to zero.

Put RF ON switch to RF ON.

NOTE: Slow rise and stabilization of HV on meterwith HV probe.

4.4.9 Decrease variac and shut down (front panel switch to OFF). Testfixture to OFF mode. (Do not remove variac and test fixture from J3 ofauxiliary switch assembly. Remove AIA4J2 from high voltage assembly).

4.5.0 Connect ribbon cable from interface assembly front panel to AIA4J2high voltage assembly.

4.5.1LED ON.

Switch power ON and note fans turning, local LED ON and power OFF

4.5.2 Press Power ON and note filament voltage across filament load onH.V. load test fixture and display r~ads PWR ON and timing from 120 secondsdown, and power ON LED ON and RF OFF LED ON.

4.5.3 The scope monitor E8 of H.V. control assembly in reference to GNDand monitor TP4 if auxiliary switch assembly E8 should be approximately +10Vand when timing is complete, display should read PWR ON standby.

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A230SER.C4

4.5.4assembly.


Press RF ON and note switching waveform at TP4 of auxiliary switchDisplay should read RF ON.

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4.5.5 Press collector voltage, LED should illuminate and display shouldread collector volts 00.0 KV, approximately.

4.5.6 Press helix voltage, and LED should illuminate and collector LEDextinguishes. Display should read helix volts 00.0 KV, approximately.

4.5.7 Press helix I (current) and LED should illuminate and helixvoltage should extinguish. Display should read helix current 00.0 rnA,approximately.

4.5.8 Connect Power Supply approximately 600 VDC with (-) to GND andmomentarily connect to junction R21 and R43 of high voltage control board.

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4.6.2 Increase variac while monitoring the cathode potential until thereis 320 VDC across bridge rectifier in test fixture.

4.6.1 ~ Press RF ON and waveform at TP4 of switcher should return and £8should go from -lOY to +IOV approximately, and display should read RF ON.

4.6.3 Check TWT data sheet for specified cathode voltage, adjust RSI forapproximately 3.9 KV (IJ) or specified cathode voltage. Press helix voltageon front panel. Adjust AIA4R32 so that front panel metering agrees with highvoltage probe measurement.

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Switching waveform goes to a volts and E8goes to (-IOV) and stays there. Displayshould read helix overcurrent and RF OFFLED illuminates.

NOTE:

4.5.9 Press RF ON waveform on auxi 1i ary switcher returns and E8 goesfrom -lOY to +IOV approximately, and RF ON LED illuminates.

4.6.0 Set power supply to approximately lOY connect (-) to El4 andmomentarily connect (+) to junction R3 and R4 of the H.V. control assembly.

NOTE: Switcher waveform goes to OV and E8 goes to(-IOV) and stays there. RF OFF LED illuminatesand display reads collector overcurrent.

4.6.4 Now consult TWT data sheet for collector voltage and verify thatit is within specified range by measuring the collector (refer to GND) andsubtracting from the cathode (refer to GND) to get the actual collectorvoltage.

V Cathode - V Collector = Actual Collector Voltage

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A2305ER.C4 Technical Manual/A230/240-330/340-350 SeriesRev C/Page 4-9

4.6.5 Press collector voltage front panel. Adjust AIA4R30 so that frontpanel metering agrees with the actual collector voltage.

4.6.6 Press helix current and adjust AIAR49 so that it agrees with helixmeter in test fixture.

NOTE: If TWT has anode proceed to step 4.7.1.

4.6.7 Turn vari ac down and turn test fi xture OFF. Turn uni t OFF bypressing PWR OFF and turn OFF Breaker 51. Disconnect test fixtures and removedummy load.

4.6.8 Connect TWT to J3 of high voltage control board and connect PI ofharness to A2J3 of auxiliary switches assembly. Terminate input and output ofamplifier.

4.6.9 Turn on supply, 51 Breaker press power ON - countdown 120 secondsto standby begins. After time out, press RF ON.

Display should read RF ON.

Display readings if I/O band:

Collector Voltage is pressed --- 1.94 KVHelix Voltage is pressed ------- 3.90 KVHelix Current is pressed ------- 1 to 4 rnA

4.7.0 Press RF OFF. Turn unit OFF and setup RF equipment for RF dataand alignment. Refer to Figure 4-3A.

4.7.1 If TWT has anode to select resistor for voltage divider, use thefollowing formula:

Let the TWT manufacturers nominal cathode voltage = X

Let the TWT manufacturers nominal anode voltage = Y

Then the anode voltage divider will be equal to:

Y x 5 Meg ohmsX-V

Example: Cathode Voltage = 3 KVAnode Voltage = -400 V

400 = 400 x 5 Meg = 769K ohms3000 - 400 2600

. NOTE: Install resistor and adjust pot on anode boardto TWT spec. Proceed back to step 4.6.7.

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4.7.2 Refer to Figure 4.3A for a suggested equipment connection to beused for measuring the amplifier performance. All components must be capableof handling the rated power output of the amplifier and provide an impedancematch over the frequency band of operation. The amplifier is rated at 10Watts, +40 dBm for the A230 amp1ifi er and 20 Watts, +43 dBm for the A330amplifier. Both model amplifiers have a saturated power capability of morethan +3 dB above rated power output.

4.7.3 The minimum gain of the A230 is 30 dB and A330 series amplifiersis 33 dB, therefore, the RF signal generator must have a capabil ity of atleast +20 dBm to supply sufficient power to drive the amplifier into powersaturation.

CAUTION

DO NOT OPERATE THE AMPLIFIERWITHOUT AN OUTPUT RF TERMINATION.

4.7.4 Connect all AC power and RF test equipment to the amplifier. Turnpower QN and after the 2 minute time delay, turn unit to RF ON. Apply RFpower to the input and take measurement data for a minimum of 5 frequenciesacross the band.

NOTE: It may be necessary to sl ightly readjustthe helix voltage if gain difficulties areexperienced at the band edges.

RF Noise Measurement

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Refer to Figure 4.3B and arrange the RF measurement equipment ast·

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4.7.6 Turn ON the amplifier. The power as indicated on the RF milliwattmeter plus the 40 dB attenuation figure is the actual noise generated by theamplifier. Is the actual noise generated by the amplifier.

Example: -27 dBm meter indication + 40 dB attenuation(-27 dBm + 40 dB = +13 dBm or 11.3 mW)

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A230SER.C4

LogiMetrics, INC

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FREQUENCYCOUNTER

INPUT PWR 1----,METER

RF SIGNALSOURCE

CAPABLE OF +20 dbm

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Technical Manual/A230/240-330/340-350 SeriesHev C/Page 4-12

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A230SER.C4

A.M. Noise Measurement


4.7.7 Refer to Figure 4.3B and adjust the signal generator for midbandoperation with the amplifier operating at rated power output.

4.7.8 Di sconnect the mill iwatt RF power meter head from the 10 dBattenuator and insert the diode in its place. With the oscilloscope connectedto the diode output, measure the DC output voltage and the AC peak-to-peakvo ltage.

4.7.9 Using the formula A.C.(-P) x 100% noise2 x (D.C.)

Calculate the noise figure of the amplifier.

Power Monitor Calibration

,- 4.8 Set the RF signal generator at midband of the operating range ofthe unit being tested. Turn the RF OFF from signal generator and leave unitin RF ON mode.

4.8.1 Press PWR ON button and adjust RIG of interface board untildisplay just reads 0 Watts.

4.8.2 Turn RF ON at signal generator and adjust RF drive for 43 dBm outas indicated on an external power meter.

4.8.3 Now adjust R14 on interface board to have display indicate 20Watts. Press power dBm button and verify it reads 43 dBm.

4.8.4 Lower RF drive from signal generator to get lW out (30 dBm) asindicated on Ext power meter. Adjust RIG on interface board to read 30 dBm.

4.8.5 Repeat if necessary and scan RF band and balance R14 and RIG fora balance across RF operating range.

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Section 5. TROUBLESHOOTING DIAGRAMS

5.0 Troubleshooting Diagrams

This section contains the Troubleshooting Diagrams that willassist in the maintenance of A230/240-330/340-350 Series.

5.1

5.2'

Required Equipment

1. DMM with current metering2. Power Supply 0-20V 100 rnA3. Oscilloscope4. High Voltage probe with meter to5 KV

Top Cover Removal

'i

5.3 Troubleshooting Diagram Index

I 1. S. NO. I TITLE I1-1 thru 7-1 Preliminary Calibration and Logic

Troubleshooting Diagram (No. H.V.)

8-1 thru 19-1 Inhibit Troubleshooting Diagram

20-1 thru 23-8 Slow Start Troubleshooting Diagram

24-1 thru 26-7 Helix Fault with H.V. TroubleshootingDi agram .

Figure 5-1 H.V. Testing and Troubleshooting

27-1 thru 29-1 Thermal Fault with H.V. TroubleshootingDiagram

30-1 thru 33-1 No/Low Filament Voltage TroubleshootingDiagram

34-1 thru 37-1 No/Low Cathode Voltage with H.V.Troubleshooting Diagram

38-1 thru 39-1 Collector Fault with H.V. TroubleshootingDiagram

40-1 thru 43-1 Inaccurate Metering with H.V. TroubleshootingDiagram

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A230SER.C5Technical Proposal/A230/240-330/340-350 Series

Rev C/Page 5-2r :

f

Unplug' connector Pl from AlA2J3.

Unplug connector from tube to AlA4J3.

Reconnect line cord and place power switches to ON position.

TS 1-1 ~\ TS 1-2Power switch lights. No 7 Check line cord,

selector card, powercord connector assy.

Yes

TS 1-3Before continuing, check all auxiliaryvoltages Ul through U6.

Yes

."

fuse, lineswitch, line

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TS 1-1/1-3. preliminary Calibration & Logic Troubleshooting Diagram I(No B. V.)

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A230SER.CS

Yes

Technical Proposal/A230/240-330/340-350 SeriesRev C/Page 5-3

TS 2-1 TS 2-2LOCAL switch illuminates -----)-+" Press LOCAL switch on fronton front panel. No" panel. Check all ribbon

connectors on AlAl, AlA3, AlA4.Refer to paragraph 3.37.

Yes

TS 2-1/2-2". preliminary Calibration & Logic Troubleshooting Diagram(No H. V.)

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Yes

Technical Proposal/A230j240-330/340-350 SeriesRev C/Page 5-4

TS 3-1 >~ TS 3-2Press PWR ON switch front Press PWR ON switch again.panel switch illuminates No Refer to TS 2-2.Read out views PRW ONtiming 120 seconds.

Yes

TS 3-1/3-2. preliminary Calibration & Logic Troubleshooting Diagram(No B.V.)

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A230SER.CS Technical Proposal/A230/240-330/340-3S0 SeriesRev C/Page 5-5

Yes

TS 4-2Check for wave form at AlA2Ull pin 5 & pin 7 to sourcesof AlA2Q2, Q3.

TS 4-1Once timing is complete, check with scope at gateAlA2TP5 to, source of AlA2Q2 for a gate drive ofapprox 10V &: at a frequency'of 25 KHz with a dutycycle of approx 45%. Check AlA2TP6 for an identicalwave form 180 0 out~of-phase.t No

Yes

TS 4-3Check AlA2Ull, AlA2VR6,AlA2VR7, AlA2Q3, AlA2Q2& that AlA2K2 is notshorted.

Yes

\11TS 4-4Check for wave forms at AlA2U9pin 3 & AlA2UlO pin 3 to GND.

No Yes

-'

TS 4-5Check AlA2U12.

'vTS 4-6Ch~ck inhibit signal" at AlA2Jlpin 5. Is it approx +12V.

TS 4-7Check inhibi't cireui t.Refer to TS 8-1.

i Ye~TS 4-8Check AlA2U9, AlA2UlO.

Yes

'v .TS 4-1/4-8. ' Preliminary Calibration & Logie Troubleshooting Diagram

(No Ei. V.)

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~ .

Yes

TS 5-2------------~> C~eck for a slow start signal

of approx +5V @ AlA2Jl pin 4.

TS 5-1Check for wave form@ AlA2TP7 to GND.Is there a wave form?

No Yes

TS 5-4Refer to slow startTS 20-1.

TS 5-3Check AlA2Q5, AlA2CRll.

No

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A230SER.C5

No

Technical 'Proposal/A230/240-330/340-350 SeriesRev C/Page 5-7

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form of approx lOV at 50 KHzrs 6-1Jepr ess RF ON switch. Check for waveHith a duty cycle of approx 60%.

TS 6-2 1No TS 6-3 TS 6-4Check for wave ) Check for wave -->? Check' for wave formform @ AlA2U8 No form @ AlA2U7 No @ AlA2U13 pins 14, 11.pin 6. pin 3.

Yes No

\11 \ IITS 6-5 TS 6-6Check AlA2Q4, CRIS, Check for slow start signal.CRl4, CRl3.

No Yes

TS 6-7\11

TS 6-8 \V~heck AlA2Q5, C27, R9. Refer to slow start TS 20-1.

_. Yes ITS 6~9 ~ TS 6-10 TS 6-11Check for inhibitl No >Replace AlA2U7. Refer to inhibit TSsignal@ AlA2Jl ,_Y~.e_s ~) 8-1.pin 5.

,~Yes

TS 6-12Check A1.A2Ql, 0R9, 08. (If FET is' replaced, replace C:R3).

Yes

toTS 6-1/6-12. preliminary Calibration & Logic Troubleshooting Diagram

(No H.V.)

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logiMetrics. INC

A230SER.C5

Yes

TS .7-1Depress PWR OFF button.


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A230SER.C5 Technical Proposal/A230/240-330/340-350 SeriesRev CjPage 5-9

TS 8-1Normal inhibit signal (no fault) is -ll.5V.For inhibit or fault +11.5V, measure @AlA4E8 to GND.

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TS 8-1. Inhibit Troubleshooting Diagram

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TS 9-1To troubleshoot a fault or inhibitcondition when no fault exists.

TS 9-1. Inhibit Troubleshooting Diagram

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TS 10-1AlA4E8 measures approx -12V. Measure voltage at anodeof AlA4CR9. Does the voltage measure approx -11V?

No

TS10-2Check AlA2Q2.

Yes

TS 10-1/10-2. Inhibit Troubleshooting Diagram

-74-

LogiMetrics. INC


l~TS 11-1 TS 11-2Measure voltage at --------;7-:l- Is there a positive voltagecathode of AlA4CR9. No present at AlA4US pin 3.Does this voltagemeasure approx +11.SV?

Yes

TS 11-3Check AlA4US

Yes

TS 11-5Check voltage referenceAlA4VR4 & AlA4R5 3.

No

TS 11-7Check voltage referenceAl.A4VR4, RS 2.

Yes

No

TS 11-4Is the voltage at AlA4U4pin 12 approx f12V?

No

TS' 11-6Is there a positive voltageat AlA4U4 pin :2.

Yes

TS 11-8c..'1eck AlA4U4.

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LogiMetrics, INC

A230SER.C5

Yes


TS 12-1 -------7-3> TS 12-2Measure voltage at No Check AlA4Q4.collector of AlA4Q5.Does this voltagemeasure approx -.7V7

Yes

TS 12-1/12:"2. Inhibit Troubleshooting Diagram

-76-

LogiMetrics. INC

A230SER.C5

Yes


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TS 13-1 TS 13-2Does the voltage at base ~~ Check under voltage protectionof AlA4Q5 measure approx No circuit consisting of AlA4Q9, Q3,-2V? VR6, VR3. Also check AlA4Q5.

Yes


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LogiMetrics, INC

A230SER.C5

Yes


TS 14-1Does the voltage at cathode of AlA4C.~4.measure approx +5V? ------~

l·yes

, TS 14-2 . :7 TS 14-3Does the voltage of Yes Check AlA4Ull, U16BAlA4U16 pin 2measure approx +5V?

No

JYes

TS 14-5Check AlA4016A

No

TS 14-4Does the voltage at AlA4U12pin 7 measure approx zero V?

1No

TS 14-6Check that AlA4U12 pin 2is low.

TS 14-7Refer to paragraph 3.37.


-78-

LogiMetrics, INC

A230SER.C5

No


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TS 15-1 -------~"7' TS 15-2Does AlA4U9A pin 4 Yes 7' Check AlA4U9.measure +5V?

No


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LogiMetrics, INC

A230SER.C5

No

Technical Proposal/A230/240-330/340-350 SeriesRev CjPage 5-17

TS 16-1 ~~ TS 16-2Does voltage at Yes Check ALA4U8AlA4U8 pin 1measure zero V?

No

TS 16-3Check the normally closedthermocouple and AlA4J6.

•

~;e;6~~ltage at AlA4U8------N-O----~>~~e~~-itA4U7,AlA4U13.pin 2 measure zero V7

TS 16':"6Does voltage at AlA4U8pin 13 measure zero V?

No


-80-

LogiMetrics, INC

A230SER. C5

No


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TS 18-1 -------3-~TS 18-2Does AlA4U16 pin 9 No Check AlA4U16.measure +5V?

Yes

TS 18-1/18-2 Inhibit Troub1eshoo~ing Diagram

-82-

LogiMetrics. INC

A230SER.C5

Yes

TS 19-1Check AlA4U19, 010.


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A230SER. C5

TS 20-1For slow start to begin, thevoltage at AlA4Jl pin 4 willgo from +5V to zero V.


TS 21-1To troubleshoot an inhibit slowstart when one is not desired.

TS 20-1, 21-1 Slow Start Troubleshooting Diagram

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LogiMetrics. INC

A230SER.CS Technical Proposal/A230/240-330/340-350 SeriesRev C/Page 5-22

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TS 22-1 TS 22-2Front panel display--------------»~Can this condition be reached?reads "RF ON- No If yes, continue to TS 23-1.

If not, refer to paragraph 3.37.

Yes

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LogiMetrics, INC

A230SER.C5

Yes


TS 23-1 -------7~TS 23-2Does AIA4018 pin 3 No Check AlA4CR22, 018.measure zero V?

Yes

TS 23-3 3=> TS 23-4~:

Does AIA4018 pin 4 No Check AlA4U8, U19, 010, U12.measure zero V:

11Yes

TS 23-5 TS 23-6Does AIA4U18 pin 5 Check that an RF ON. signalmeasure zero V7 of zero V is present at

A.LA4U12 pin 3, if not referto paragraph 3.37.

YesNo

TS 23-7Check AlA4U18.

TS 23-8Check Ull. Also checkfor a PWR ON signalof zero V @ AlA4U12 pin 2.

TS 23-1/23-8 Slow Start Troubleshooting Diagram

-86-

LogiMetrics. INC


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24.0 H.V. Testing and Troubleshooting

An H. V. load will be needed when troubleshooting to besure tube is not damaged.

Figure 5-1. H.V. Testing and Troubleshooting II

A 1A4J3~

CD ( filament

0 ( cathode 3.9kv

2kv.

(2) ( collector

" groundchassis· ····rground

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scope

TS 24-2______~~ Check for shorts to GND from

Yes cathode & filament connections.The resistance of the load shouldbe measured.

1fault occurRFON is de-

TS 24-4Does the voltage exceed 4.1 KV1Refer to TS 25.1.

Yes

TS 24-3Measure with an HV scope probe and a storageto ensure that the cathode voltage does notexceed 4.1 KV. Does the helix fault occur

- before the voltage reaches regulated output?

INC

TS 24~1

--Does helixevery timepressed.

Yes No

TS 24-5Check for referencevoltage @ AlA4VR4. CheckAlA4B3. Is feedbackvoltage present?

TS 24-6Check voltage potentiometerAlA4R51, U3, VR4 & all asso-

·ciated components.

Ii

·1II;!

Yes

TS 24-7Check AlA2Ql.

No

TS 24-8Check AlA4U3 & all relatedcomponents including voltageadj. potentiometer RSI.

I

IV

No

TS 24-1/24-8 Helix Fault with H.V. Troubleshooting Diagram-88-

LogiMetrics. INC

A230SER.C5

No


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TS 25-1Check that fast o.c. IC AlA405 pin 3is at approx 5V and that slow o.c.AlA4U4 pin 2 is at approx 2.5V, if socheck AlA4R43, R42, 05, 04.

TS 26-11

Adjust AlA4R53 to get 5Vat AlA4US pin 3 and adjustAlA4R52 to get 2.SV atAlA4U4 pin 2.

TS 25-1/26-7 Helix Fault with H.V. Troubleshooting Diagram

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TS 27-1This test is performed with tubeconnected and all other circuitry functioning.

TS 28-1Jr

TS 28-2Does thermal fault occur >~ Check tha t +ISV to fans isbefore RF ON is depressed? No measured at AlE3 (located

inside rear of unit on chassis)to GND.

No

TS 28-3Check AlA203.

Yes

TS 29-1 .Check connection between thethermocouple & AlA4J6 pin 1.should measure zero volts atCheck the~mocouple on tube.

N.C.It

pin 1.

Yes

TS 28-4"Check to make sure both fans areoperating & that the air passageis clear & the thermocouple onthe tube is operatIonal &accurate.

TS 27-1/29-1 Thermal Fault with H. V. Troubleshooting Diagram

-90-

LogiMetrics, INC

A230SER.C5 Technical Proposal/A230j240-330j340-350 SeriesRev CjPage 5-28

TS 30-1 ,H. V. does not need to be On when checking filament supply.Unplug AlA2Pl.

TS 31-1 TS 31-2First check to see if a ----->~ Check that A1A3U14 pin 2, 3,light signal is present NO is low or zero V. Check U16 U7A,on the light fiber by un- U12 for a PWR ON signal.plugging it from AlA4U15with the front panel.Display reading PWR ON orRF ON or STANDBY. Is thelight fibre illuminated.

Yes

TS 32-1 ~ TS 32-2Check that AlA4UlS pin 8 No Check AlA4U15.is pulled down to GND when,light fibre is insertedinto U15 ..

lyesTS 33-1Check for AC voltage from Tl.Check Zl, C29, Q6, Q7, 017,CRlS, CRl9.

TS 30-1/33-1 N%r Low Filament Voltage Troubleshooting Diagram

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A230SER. C5 Technical ProposaljA230j240-330/340-350 SeriesRev C/Page 5-29

CAUTION

Check AlA2TPS to source of.AlA2Q3. All should haveKHz. If not, refer to

H.V. PRESENT WHILE TESTING. DISCONNECT TUBEAND CONNECT DUMMY LOAD AS PER DIAGRAM

TS 34-1Check AlA2TP7 to source of AlA2Ql.AlA2Q2. Check AlA2TP6 to source ofdrive Q1 at 50 KHz and Q2, Q3 at 25preliminary calibration TS 1-1/7-1.

TS 35-1t "" TS 35 2Voltage across R37 (E4,---H-i-9-h--7"~If ou~put cathode voltage isE7) should measure approx. low & voltage across R37 is

. 150 VDC. Is voltage correct? high, check AlA2Q2, AlA2Q3.

YesL.-------7~TS 35-3

Low If output cathode voltage 1Slow and voltage across R37 islow check cathode voltage.Check setting on AlA4R51.

--TS 36-1 TS 36-2Similar waveforms should ~~ Check Q2, Q3. Check snubberappear across Q2, Q3 of No circuits consisting of VR2-VR5approx 350V & approx Cl, C2, Rl6-Rl9, CRl6, CRl7.duty cycle.

Yes

TS 37-1Check high voltage doubler andbridge. Check all H.V. outputcomponents.

TS 34-1/37-1 No/Low cathode Voltage with H.V. TroubleshootingDiagram

-92-

LogiMetrics. INC

A230SER.C5 Technical Proposal/A230j240-330j340-350 SeriesRev CjPage 5-30

CAUTION

H.V. PRESENT THROUGHOUT COLLECTORFAULT CIRCUIT TO LIGHT FIBRE.

TS 38-1. Disconnect light :eiber pipe connected to A.lA4Ul. Does collector·fault occur with dummy ~oad connected?

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TS 39-1rCheck AlA4013, R69.

No

TS 38-2Check AlA4UlVRl, R77, RBl,C3 and light tiber.

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-93-

LogiMetrics, INC


TS 40-1Attempt to adjust AlA4R32, RJO, R49to acquire proper reading of meters.

1TS 41-1 ----.~ TS .41-2With correct cathode voltage Yes Refer to paragraph 3.37check to see-helix E outputAlA4J2 pins 4, & 6 can beadjusted from zero V to SV.

TS 42-1Check AlA4U2j R32.

TS 43-11 .For collector voltage and helixcurrent, follow same procedureas TS 41-1, checking for voltageadjustment on corresponding pins.

TS 40-1/43-1 Inaccurate Metering with R.V. Troubleshooting Diagram

-94-

logiMetrics. INC


Section 6. DRAWINGS - SCHEMATICS, ASSEMBLIES AND PARTS LIST

6.0 Drawings - Schematics, Assemblies and Parts List

This section contains the schematic and assembly drawings that areessential aids in the maintenance of the A230/240-330/340-350 Series.

-95-

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