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1 to 7 Peak Programme Meter Drive Amplifier

PPM 131

PPM 131 is a small, high quality meter drive amplifie r, ideal for incorporation 1nto m1xers and other equipment where unbalanced s1gnals are present. If necessary, input balancing can be achieved by a transformer avail able from Soundex.

There IS adequate ga1n to cope with non-standard leve ls.

Power supplies present no prob lem to the PPM 131 , s1nce apart from being protected against reverse b1as1ng , the amp li fier may be operated from e1ther s1ngi <c' or dual ra il power - the OV generator on board t an be linked in or out of use. • •

Each PPM 131 leaves the Soundex fac tory hav1ng been al igned , both statically and ballistically , to the BS5428 spec ification and because on ly high stability close tolerance components are used , re-a l1gnment 1s achieved in two steps

Bulgin Electronics One of the Bulgin Group of Companies Soundex Ltd Park Lane, Broxbourne, Hertfordshire, EN1 0 7NQ England. Telephone: Hoddesdon (09924) 64455

Specification

The fol lowing speci fication will only apply when the PPM 131 is used in conJunction with a peak programme meter movement conforming to draft BS 5428 pt 9 or IEC 268-1 OA.

Performance

Dimensions

BS 5428 type 2A and 2B

72.5mm x 57mm x 12mm (component height)

Power Requirements

Input

Sensitivity

Voltage : +20or ± 10V D.C. to +30or ± 15V D.C. Current: 31 mA

Protection : Diode protected against reverse connection

Configuration: Unbalanced (Balancing transformer BTX 1 may be added)

Impedance: 8K2 ohm Connector: 5 pin, 0 1 inch pitch Mol ex type

Variable up to --6dB indicating as OdB meter

Frequency Response The frequency response has not been deliberately rolled off and is flat± 0.3dB at each input level up to the frequency shown intable2.

Accuracy See table 1

Indicating Instrument Type: Any PPM movement conforming to

BS 5428 type 2A and 28 may be applied to the PPM 131

Scale: 1 to7or --12dBto +12dB

Dynamic Response

Table 1

Input volts Input R.M.S. dB

0.1\!456 - 12 0.30837 - 8 0.48873 - 4 0.77459 0 1.22765 + 4 1.94569 + 8 3 08372 +12

Installation

Attack : Measured by applying bursts of 5KHz tone for various periods at an amplitude which would read +8dB if continuous

Burst Width ms

100 10

5 1.5 0.5

Meter reading relative to MK6 (+BdB)

0 ± O.SdB - 2.5 ± O.SdB -4 ± 0.75dB - 9 ± 1dB

-17 ± 2 OdB

Decay: 2.8 ± 0.3 sec (Time taken for meter to fall between+ 12dB and - 12dB)

Table 2

Max error Indication Frequency dB dB KHz

±0 5 +12 52 ±0.2 + 8 50 ±0.3 + 4 31 ±0.2 0 25 ±0.3 - 4 24 ±0.2 - 8 20 ±0.5 -12 17

The PPM 131 is intended to be secured directly onto the input studs of the meter movement and various fixing locations make this a possibility with most commonly used meters . All other electrical connections are made via a 5 pin , 0.1 " pitch connector supplied with the PPM 131

Connector Pin Designations

Pin No.

1

2 3 4 5

Function

Posit1ve supply Internally generated OV Negative supply External OV supply S1gnal input

~o:::::=:;::-::;-::;-------;:=:=========:::;~ ~ Power supply dual rail When the PPM 131 is powered from a dual rail supply the internal ly generated OV should be disregarded, therefore connect as shown below, making no connection to pin 2.

Power supply single rail Operation from a single ra1l power supply requires that use be made of the internally generated OV for the correct function of the PPM 131 Connect as shown below and short pins 2 and 4 together

+ve- dJ ov. ­

Audio~l

I._~ ~_p

PPMlll

PPM131

[b

~---------------"

Audio

PPM131

Sourdex MX1 dJ Bk.

[b

Audio should be connected to pin 5. VR1 is used to attenuate the input and therefore sets the gain of the PPM 131 Independently of law. Balancing of the aud io 1nput can be achieved by the use of a balancing transformer as shown below. The Soundex BTX1 is a suitable 1:1 transformer designed to work into 1 OK ohm load

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Commissioning Each PPM 131 has been carefully aligned to meet the specifications previously mentioned and it will be found that apart from minor gain adjustment using VR1 , no other adjustments are necessary. However, it is recommended that the following checks are carried out to ensure correct function and where necessary the remedial procedures can be followed. Before powering up the PPM 131 , check power and aud io connections are correct and that the meter is mechanically zeroed. With no audio signals present, turn on power and confirm that the meter needle remains at zero. (There may be an initial jolt to the meter needle). Any zero error at this stage may be removed using VR2. Connect audio and apply 0 level tone , 1KHz (0.77459V R.M.S.) and see that the meter indicates 0 level (MK4). If not, adjust VR1 and afterwards confirm that all · other points on the scale are within tolerance by application of appropriate tone levels. It will normal ly be found that all points can be toleranced with this one adjustment , but if not proceed to law adjustment.

Law Adjustments Proceed as for commissioning but, instead of applying 0 level tone alld adjusting VR1 to obtain 0 level (MK4) on the meter, apply -8dB tone and adjust VR1 to obtain -8dB (MK2) on the meter. Then apply +8dB tone and adjust VR3 to set +8dB (MK6) on the meter. The law should then be correct and may be verified by application of appropriate tone levels without further adjustments to the PPM 131 N.B. Extraneous fe rrous objects (including mounting panel ) in the proximity of the meter movement will interfere with its linearity, therefore confirm that this phenomenon is not responsible if alignment difficulties occur.

Attack and Decay R14 sets the decay time and R13 sets the attack time. These have been factory set by tone burst generator (see specification). When two PPM 131 's are used as a stereo pair it may be necessary to maintain tracking of the two meters on decay. This should be done by speeding up the slower meter with a high value resistor placed in parallel with R14. Experience has shown that differing attack times are not perceivable when both are within specification.

Ordering Details Description PPM 131 driver card including connector Balancing transformer

Order Code PPM 131 BTX 1

Various meter movements suitable for use with the PPM 131 are stocked by Soundex. For complete details on meters conforming to draft BS 5428 type 2A and 28, see Soundex data sheet

Bulgin Electronic·s © Bulg1n Electronics Soundex Ltd . 19821ssue I

One of the Bulg1n Group of Compan1es Soundex Ltd Park Lane, Broxbourne, Hertfordshire, EN10 7NQ England . Telephone: Hoddesdon (09924) 64455

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PROPOSED SPECIAL FACILITY SPECIFICATION FOR AGREEMENT : BALANCED PATCHBAY

REFER TO: AHB SYNCON · B MANUAL SCHEMATICS SBC 12 FIG6 & SBC 13 FIGS AND TO PLANS ATTACHED

General Specification

Module Circuit Configuration

SB12 ch Mic I/P ~ Transformer Ba l ' Line I/P II II

M'track 0/P II II

Tape 1/P Unbalanced FX I/P . Unbalanced Pre eq ins't Unbalanced 0/P insert Unbalanced

SB21 mst'r Aux 0/P A Transformer Bal II II II II 8 II II

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2 L R II II

3 L R II II

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Output impedance: 22 bhms plus L + C + R of transformer approx 75 ohms total midband

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