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“Invent a New India Using Knowledge”

है”ह”ह

IS 1885-81 (1993): Electrotechnical Vocabulary, Part 81:Electrical Measuring Instruments [ETD 1: BasicElectrotechnical Standards]

December 1993

IS 1885( Part81 ) :1993

WTGhfWmIEC Pub50(302) ( 1983)

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f~d m mrwm

lndzan Standard

ELECTROTECHNIC’ALVOCABULARY

PART 81 ELECTRICAL MEASURING INSTRUMENTS

(.JDC 621”317:001”4

@ BIS 1993

BUREAU OF INDIAN STANDARDS

MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG

NEW DELHI 110002

h-ice Group 4,,

Basic Electmtechnical Standards Sectional Committee, ET 01

CONTENTS

Section Page

302-01

302-02

302-03

302-04

302-05

302-06

302-07

302-08

302-08

CHAPTER 302: ELECTRICAL MEASURING INSTRUMENTS

General terms relating to the principle of operation . . . . . .

General terms relating to constructional or operational details

Detecting and indicating instruments . . . . . . . . . . . . . .

Electric energy meters .. . . . . . . . . . . . . . . . . . . . .

Bridges . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Constructional elements . . . . . . . . . . . . . . . . . . . .

Terms relating to technical characteristics . . . . . . . . . . .

Terms relating to the performance . . . . . . . . . . . . . . .

Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . 1

. . . . . . . . . . . . . . . . . . 2

. . . . . . . . . . . . . . . . . . 3

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. . . . .. . . . . . . . . . . . . . 5

. . . . . . . . . . . . . . . . . . 5

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. . . . . . . . . . . . . . . . . . 6

. . . . . . . . . . . . . . . . . . 7

NATIONAL FOREWORD

This Indian Standard (Part 81) which is identical with IEC Pub 50 (302) (1983) ‘International electrotechnicalvocabulary-Chapter 302 : Electrical measuring instruments’, issued by the International ElectrotechnicalCommission (IEC), was adopted by the Bureau of Indian Standards on the recommendation of BasicElectrotechnical Standards Sectional Committee and approval of the Electrotechnical Division Council.

Only the English text given in the IEC publication has been retained while adopting as ~dian Standard, and thepage numbers given here are not the same as in IEC Publication.

IS 1885 (Part XI): 1966 ElectrotechnicaI Vocabulary Part XI Electrical Measurements was based on IEC Pub 50(20) (1958) International electrotechnical vocabulary :Group 20 Scientific and industrial measuring instmments.IEC 50 (20)(1958) has been revised and extended and has been brought out in one volume as IEC 50 (301, 302,303), Chapter 301: General terms on measurements in electricity, Chapter 302: Electrical measuring instrumentsand Chapter 303: Electronic measuring instruments.

IS 1885 (Part 81) is being brought as dual numbered standard of IEC 50 (302) and similarly IEC 50 (301) and1~” 50 (303) are being dealt. When all the three parts of IS 1885 corresponding to IEC 50 (301, 302, 303) havebeen brought out, IS 1885 (Part XI) :1966 will stand withdrawn.

1S 1885 (Part 81): 1993IEC Pub 50 (302) (1983)

Indian Standard

ELECTROTECHNICAL VOCABULARY

PART 81 ELECTRICAL MEASURING INSTRUMENTS

CHAPTER 302: ELECTRICAL MEASURING INSTRUMENTS

SECTION 302-01—GENEML TERMS RELATING TO THE PRINCIPLE OF OPERATION

302-01-01

electrostatic instrument

An instrument intended to determine potential dif-ference which operates by means of electrostatic forcesbetween fixed and movable charged electrodes.

302-01-02

permanent-magnet moving-coil instrument

An instrument which operates by the interaction of acurrent in a movable coil with the field of a fixedpermanent magnet.

Note — llse movable part of these instruments can have more thanone coil, measuring the sum or ratio of the currents inthem.

302-01-03

moving-magnet instrument

Au instrument which operates by the interaction of thefield of a movable permanent magnet with a current ina fixed coil.

Note. — The instrument can have more than one coil.

302-01-04

moving-iron instrument

An instrument comprising a movable pieee of soft mag-netic material which is actuated either by a current in af~ed coil or by one (or more) fixed piece(s) of soft mag-netic material, magnetized by a current in the fixed coil.

302-01-05

electrodynamics instrument

An instrument which operates by the interaction of a cur-rent in a movable coil with a current in one or more fixedcoils.

Note. — This term is generally reserved for instruments which dono! have ferromagnetic material in the magnetic circuit,

302-01-06

ferrodynamic instrument

An instrument which operates by the interaction of a

current in a movable coil with a current in one or morefixed coils and which incorporates soft ferromagneticmaterial in the magnetic circuit.

302-01-07

induction instrument

An instrument which operates by the interaction of thealternating magnetic field(s) of (a) fixed electro-mag-net(s) with the magnetic field(s) due to currents whichthey induce in (a) movable conductive element(s).

302-01-08

thermal instrumentelectrothermal instrument (USA)

An instrument which operates by the heating effect ofone or more currents.

302-01-09

bimetallic instrument

A thermal instrument in which the deformation of abimetallic element, heated directly or indirectly by acurrent produces the indication.

302-01-10

thermocouple instrument

A thermal instrument in which the current heats one ormore thermocouples of which the electromotiveforce(s) is (are) measured.

302-01-11

rectifier instrument

An instrument intended to measure alternatingquantities~ usually of the permanent-magnetmoving-coil type, in association with a rectifyingdevice.

302-01-12

vibrating reed instrument

Au instrument intended to measure frequency, compris-ing a set of tuned vibrating reeds, one or a few of whichresonate under the action of an alternating current of theappropriate frequency flowing through one or morefixed coils.

1

IS 1885 (Part 81) :1993IEC Pub 50 (302) (1983)

SECTION 302-02-GENERAL TERMS RELATING TO CONSTRKJCTIONALOPERATIONAL

302-02-01

direct acting instrument

An instrument in which the indicating or recordingdevice is mechanically connected to, and actuated by,the moving element.

302-02-02

indirect acting instrument

An instrument in which the indicating or recordingdevice is driven by a motor or other device, controlledby the quantity to be measured and usingelectromechanical, electrical or electronic means.

Note. — Indirect acting instruments may make use of any methodof comparison, but this is usually electrical or

mechanical.

302-02-03

pointer instrument

An indicating instrument in which the index-is a pointermoving over a fixed scale.

302-02-04

instrument with optical index

An indicating instrument in which the indications aregiven by the displacetnent of an optical index over ascale which may be a part of the instrument or may beseparate from it.

302-02-05

moving-sctile instrument

An indicating instrument in which the scale movesrelative to a fixed index.

Note.— An instrument ,ih which the scale is projected is aparticular type of moving-scale instrument.

302-02-06

shadow column instrument

An indicating, instiwinent in which the indications aregiven by a shadow coluinn on an illtnnmated sqlewhich may be a part of the instrument or may beseparate froln it.

302-02-07

chart driving mechanism

A device for moving the chart in a way which is afunction of a variable, generally time.

DETAILS

302-02-08

strip chart recorder

A recording instrument in which the chart is a stripdriven by the’chart driving mechanism.

302-02-09

drum recorder

A recording instrument in which the chart is wrappedas a single turn around a cylindrical dmm which isrotated by the chart driving mechanism.

302-02-10

disc recorder

A recording instrument in which the chart is a discwhich is rotated by the chart driving mechanism.

302-02-11

pen recorder

A recording instrument in which the record on the chartis made by a pen supplied with ink.

302-02-12

stylus recorder

A recording instrument in which the record on the chartis made by a styhts requiring no ink.

302-02-13

spot recorder

A recording instrument in which the record is made bya spot of light (visible or invisible) on a light-sensitivechart.

302-02-14

thetial recorder

A recording htstrumxtt in whicti the record is made bya heated stylus on a heat-sensitive chart.

302-i12-15

j~t recorder

A recording instrument in whicli the record is made bydirecting a jet of iiik on to the ctiart.

302-02-16

printing recorder

A recording instrument in which the record ~Smade bya succession of printed marks.

2

IS 1885 (Part 81) :1993IEC Pub 50 (302) (1983)

302-02-17

continuous line recorder

A recording instrument in which the record is acontinuous line.

302-02-18

dotted line recorder

A printing recorder in which the record comprises aseries of successive impressions which may be points}numerals, etc.

302-02-19

event recorder

A recording instrument which records the presence orabsence of a quantity or the state of a two-state deviceas a function of time.

302-02-20

instrumentwith suppressed zero

An instrument which gives no useful information whenthe quantity to be measured is less than a certain value.

Note.— “Suppressed zero” can apply to either mechanical zeroor electrical zero (see 301-07-20 and 301-07-22).

302-02-21

expanded scale instrument

An instrtrment in which a small part of the measuringrange is expanded to occupy the greater portion of thescale length.

302-02-22

astatic measuring instrument

Art instrument in which the measuring element is soconstructed as to be unaffected by uniform magneticfields of external origin.

302-02-23

instrument with locking device

An instrument in which a device can look the movingelement in the position where it stands at a given time.

302-02-24

instrument with contacts

An instrutnent in which the moving element operatescontracts at certain predetermined positions.

SECTION 302-03-DETECTING AND INDICATING INSTRUMENTS

302-03-01

polarity indicator

A detecting instrument intended to indicate the polarityof one conductor with reference to another.

302-03-02

phase sequence indicator

An instrument intended to indicate, on a polyphasesystem the sequence in which the instantaneous vol-tages of the phase conductors reach their maximumvalues.

302-03-03

synchronoscope

Art instrument intended to indicate if two a.c. voltagesor polyphase voltages systems have the same frequencyand are in phase.

302-03-04

insulation fault detecting instrument

Au instrument intended to detect faults in electricalinsulation.

302-03-05

earth leakage detector

An instrument intended to detect a leakage current toearth.

302-03-06

live voltage detector

An instrument intended to show whether or not aconductive component is live.

302-03-07

measuring spark gap

A spark gap, generally between spheres, intended tomeasure peak voltage as a function of the flashoverdistance between the electrodes.

302-03-08

electroscope

An electrostatic instrument intended to detect a potent-ial difference or an electric charge..

IS 1885 (Part 81) :1993IEC Pub 50 (302) (1983)

302-03-09

quadrant electrometer

An electrometer in which the moving element-is ac-tuated by electrostatic forces between that element andfixed elements shaped like quadrants.

302-03-10

magnetic detector for lightning currentmagnetic link (deprecated in this sense)

An instrument intended to detect a lightning stroke andto give an estimate of the value of the current due to thislightning stroke by means of changes in the magneticcharacteristics of some of its components.

302-03-11

moving-coil galvanometers

A galvanometers in which a coil carrying a currentmoves in the field of a permanent magnet.

302-03-12

ballistic galvanometers

A galvanometers intended to measure the ~ahre of a

quantity of electricity by reading the amplitude of thefirst swing of its moving element.

302-03-13

string galvanometers

A galvanometers in which the moving element is aconductive thread which is stretched between the polepieces of a permanent magnet or of an electromagnet.

302-03-14

difference galvanometersdifferential galvanometers (deprecated)

A galvanometers intended to measure the difference oftwo currents.

302-03-15

vibration galvanometers

A galvanometers in which the natural frequency of themoving element is adjusted to resonate with the fre-quency of the current to be measured or detected.

SECTION 302-04-ELECTRIC ENERGY METERS

302-04-01

mercury motor meter

An energy meter or a coulometer having a discimmersed in mercury and rotating in the field producedby an electromagnet or a permanen~ magnet.

302-04-02

electrodynamics meter

An energy meter which operates by the rotation of themoving coils of an electrod ynamic measuring element.

302-04-03

induction meter

An energy meter which operates by the rotation of thedisc of an induction measuring element.

302-04-04

excess energy meter

An energy meter intended to measure the excess energywhen the power exceeds a pre-determined value.

302-04-05

meter with maximum demand indicator

An energy meter fitted with a means to indicate thehighest value of theequal time intervals.

302-04-06

multi-rate meter

power averaged over successive

An energy meter provided with a number of registers,each becoming operative at specified time intervalscorresponding to different tariff&

302-04-07

prepayment meter

A device which is combination of an energy meter anda coin-freed mechanism which, by insertion of asuitable coin, connects a supply of electricity and, afterthe consumption of a pre-determined value of energy orafter a pre-determined time interval, disconnects thesupply.

4

IS 1885 (Part 81) :1993[EC Pub 50 (302) (1983)

SECTION 302-05—BRIDGES

Preface.-Owing to the great variety of types ofbridgeswhich are often known by different names and differonly by details of their circuits, /he list of termsdefined in the present section is lim]ted to some basictypes only.

302-05-01

Whetstone bridge

A four arm measuring bridge intended to measure thevalue of a resistor which forms one of the arms, the otherthree arms being resistors, at least one of which isadjustable.

302-05-02

Kelvin (double) bridge

Thomson (double) bridge

A six arm measuring bridge intended to measure thevalue of a four-terminal resistor by comparison with afour-terminal standard resistor, all of the arms beingresistors, at least one of which is adjustable.

302-05-03

transformer bridge

An a.c. measuring bridge intended to measure impedan-ces, in which at least two arms consist of tapped wind-ings on a transformer, making use of the known ratiosof the turns and which can therefore have fixed valuestandards.

SECTION 302-06-CONSTRIJCTIONAL ELEMENTS

302-06-01

measuring element (of an electromechanicalmeasuring instrument)

That part of a measuring instrument which transformsthe quantity to be measured into a mechanical move-ment.

A circuit of a measuring instrument through whichflows the current of the circuit to which the measuringinstrument is connected.

Note.— This current may be either the current directly invokedin the measurement or a proportional current suppliedby an external current tmnsformer or derived from anexternal shunt.

302-06-02302-06-05

moving element

The moving part of a measuring element. voltage circuit (of a measuring instrument)

302-06-03 A circuit of a measuring instrument to which is appli~d

register (of an integrating instrument)the vol~age of the circuit to which the measuring instru-ment is connected.

The part of an integrating instrument which enables themeasured value to be determined. Note.— This voltage may be either the voltage directly involved

302-06-04in the measurement or a proportional voltage suppliedby an external voltage transformer or voltage divider orderived by means of an external series resistor

current circuit (of a measuring instrument) (impedance).

SECTION 302-07-TERMS REL4TING TO TECHNICAL CHARACTERISTICS

302-07-01 The torque which tends to bring the moving back to themechanical zero of the instrument.

deflecting torquedriving torque 302-07-03

A torque resulting tiom e.g. electrostatic or braking torque (of an integrating instrument)electromagnetic effects on the moving element.

The torque resulting from the interaction of the field ot’302-07-02 a fixed permanent magnet with the currents induced by

it in the rotor of an integrating instrument and opposingrestoring torque its rotation.

5

IS 1885 (Part 81) :1993IEC Pub 50 (302) (1983)

302-07-04

damping torque

A torque which tends to reduce unwanted oscillationsof the moving element.

302-07-05

critical resistance (of a permanent-magaet moving-coil measuring element)

The maximum value of resistance to be connectedacross the terminals of the measurinz element in orderto cause its movement to be aperiod~.

SECTION 302-08-TERMS

302-08-01

reference value

302-07-06

circuit insulation voltage

The voltage with respect to frame or chassis of a circuitof an instrument and for which the circuit has beendesigned.

302-07-07

insulation test voltage

The voltage at which the insulation test on an instrumentis made.

RELATING TO

302-08-06

A specified value of one of a set of reference conditions.

302-08-02

reference range

A specified range of values of one of a set of referenceconditions.

302-08-03

variation (due to influence quantity)

The difference between the indicated values for thesame value of the measured quantity of an indicatinginstrument or the true values of a material measurewhen an influence quantity assumes successively twodifferent values.

302-08-04

nominal range of use

A specified range of values which an influence quantitymay assume without causing a variation exceedingspecified limits.

302-08-05

limiting values for operation

The extreme values which an influence quantity canassume during operation without damaging the instru-ment so that it no longer meets its perfortnauce require-ments when it is subsequently operated under referenceconditions.

Nofc.— The Iimitingvalues may depend on the duration of theirapplication.

limiting values for storage

The extreme values which an influence quantity canassume during storage without damaging the instru-ment so that it no longer meets its performance require-ments when it is subsequent y operated under referenceconditions.

Note.— I%e limiting values may depend on the duration of theirapplication.

302-08-07

limiting values for transport

The extreme values which an influence quantity canassume during transport without damaging theinstrument so that it no longer meets its performancerequirements when it is subsequently operated underreference conditions.

Note.— The limiting values may depend on the duration of theirapplication.

302-08-08

accuracy class

A class of measuring instruments all of which are in-tended to comply with a relevant set of accuracy re-quirements.

302-08-09

class index

Conventional designation of an accuracy class by anumber or symbol.

6

Is, lsfs @aA *1) :1993~C Pub 50 (302) (~983)

INtiEX

A

accuracy class

astatic measuring instrument

B

ballistic galvanometers

bimetallic instrument

braking torque (of an integrating instrument)

c

chart driving mechanism

circuit insulation voltage

class index

continuous line recorder

critical resistance (of a permanent-magnet moving-coil measuring element)

D

damping torque

defkctihg torque

difference galvanometers

differential galvanometers depreated

direct acting instrument

disc recorder

dotted line r&order

driving torque

drum r&order

E

earth leakage detector

electrodynaniic instrument

electroiiynsm ic meter

electro~pe

ek.ctmstatic i~trument

electrothermal instrument (USA)

event r&oider

excess energy meter

expanded ~ale instrument

F

ferrhdynarnic inatmrnent

I

indirect acting instrument,,,

induction instrument.,::

induction beter

instruriient with contacts

;nstrument with locking device,,1, .

instrument with optical index

ins&ierit with suppressed zero

302-08-08

302-02-22

302-03-12

302-01-09

302-07-03

302-02-07

302-07-06

302-08-09

302-02-17

3d2-07-05

3ri.07.04

302-07-01

302-03-14

302-03-14

302-02-01

302-02-10

302-02-18

302-07-01

302-02-09

302-03-05

30j.f)14)5

302-04-02

302-03-08

302-01-01

3~~-ol-08

302-02-19

30~.f34@$

302-02-21

302-01-06

30~_()~4)2

3(J2.o14j7

30~.04JJ3°

3oz.02-~4

30~.()~.~3

302-02-04

3oz.OZ-20

7

instrument fault detecting instrument

insulation test voltage

jet recorder

Kelvin(double)bridge

J

K

L

limiting values for operation

limiting values for storage

iimiting values for transport

live voltage detector

M

magnetic detector for lightning currents

magnetic link (deprecated in this sense)

measuring element (of an electromechanicalmeasuring inatruitrentj

measuring spark gap

mercurj motor meter

meter with maximum demand indicator

moving-coil galvanometers,.

moving element

moving-iron instrument

rnoving-inagrret instrument

moving-scale instrument

multi-rate meter

N

nominal rairg of use

P“

pen rebder

permaiient-magriet moving-coil instrurirent

phase sequence indicator

@inter i&trurnent

polarity indicator

prepayment meter

printirig r&order

Q

quadrant ekxtrometer

R

rectifier instrument

reference range

reference vilue

regis;er (of an integrating instrument)

resloring torque

302-03-04

302-07-07

302-02-15

302-05-02

302-08-05

302-08-06

302-08-07

302-03-06

302-03-10

302-03-10

302-06-01

302-03-07

302-04-01

302-04-05

302-03-11

3&2-06-E

302-01-04

302-oi-03

302-02-05

302-04-06

302-08-04

3oz.02- ~I

302-01-02

302-03-02

302-02-03

3ci2-03-ol

302-04-07

302-02-16

302-03-09

3~~.ol.il

30~.()&(}~

30~-08.()[

302-06-03

30?-07-02

IS 1885 (Part 81): 1993IEC Pub 50 (302) (1983)

s

shadow column instrument

spot recorder

string gafvanonreter

strip chart recorder

stylus recorder

synchronoscope

thermal instrument

thermal recorder

thermocouple instrument

Ilromson (double)bridge

transformer bridge

302-02-06

30~~2-13v

302-03-13

302-02-08vsriation (due to inffuenee quantity)

302-02-12vibrating reed. instrument

302-03-03vibration galvanometers

Tvoltage circuit (of a measuring instrument)

302-01-08 w

302-02-14

302-01-10 Wlreatatone bridge

302-05-02

302-05-03

302-08-03

302-01-12

302-03-15

302-06-05

302-05-01

8

,1

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Doc No. ET 01 (3860)

Amendments lamed Sines Publication

Amend No. Date of Issue Text Mected

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