Iec 60051-1-2016.Pdf

IEC 60051 1 Edition 6 0 201 6 02 INTERNATIONAL STANDARD NORME INTERNATIONALE Direct acting indicating analogue electrical measuring instruments and their accessories – Part 1 Definitions and general r[.]

Part 1: Definitions and general requirements common to al parts

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Part 1: Definitions and general requirements common to al parts

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CONTENTS

FOREWORD 5

INTRODUCTION 7

1 Sco e

8 2 Normative referen es 8

3 Terms an definition 9

3.1 General terms 9

3.2 Des ription of in truments ac ordin to their method of o eration 13 3.3 Con tru tional fe tures of in truments 14 3.4 Characteristic fe tures of in truments 16 3.5 Characteristic values 17 3.6 Influen e q antity, referen e con ition , nominal ran e of u e an precon itionin 17 3.7 Un ertainty an variation 19 3.8 Ac urac , ac urac clas an clas in ex 21

3.9 Test 21

4 Des ription, clas ification an compl an e 2

4.1 Des ription 2

4.1.1 Des ription ac ordin to method of o eration or nature 2

4.1.2 Des ription ac ordin to en ironmental con ition 2

4.1.3 Des ription ac ordin to mec anical con ition 2

4.1.4 Des ription ac ordin to degre s of protection 2

4.2 Clas ification 2

4.3 Compl an e with the req irements of this stan ard 2

5 Req irements 2

5.1 Referen e con ition 2

5.2 Limits of intrin ic u certainty, fid cial value 2

5.2.1 Limits of intrin ic u certainty 2

5.2.2 Cor esp n en e b twe n intrin ic u certainty an ac urac clas 2

5.2.3 Fid cial value 23 5.3 Nominal ran e of u e an variation 2

5.3.1 Nominal ran e of u e 2

5.3.2 Limits of variation 27 5.3.3 Con ition for the determination of variation 28 5.4 Op ratin u certainty, overal s stem u certainty an variation 28 5.5 Electrical req irements 2

5.5.1 Electrical safety req irements 2

5.5.2 Self he tin 28 5.5.3 Permis ible overlo d 2

5.5.4 Limitin ran e of temp rature 2

5.5.5 Deviation from zero 2

5.5.6 Electromag etic comp tibi ty (EMC) 2

5.6 Con tru tional req irements 30 5.6.1 General con tru tional req irements 3

5.6.2 Dampin 3

5.6.3 Se l n to prevent ac es 3

5.6.4 Scales 31

5.6.5 Sto p r 3

5.6.6 Prefer ed values 3

5.6.7 Adju ters, mec anical an /or electrical 3

5.6.8 Ef ects of vibration an s ock 3

5.6.9 Degre s of protection provided by en los re 33 5.6.10 Terminals 3

6 Information, markin s an s mb ls 3

6.1 Information 3

6.2 Markin s, s mb ls an their location 3

6.3 Markin s relatin to the referen e values an nominal ran es of u e of influen e q antities 36 6.4 The s mb ls for markin in truments an ac es ories 3

6.5 Markin s an s mb ls for terminals 4

6.5.1 Req irements for markin s 4

6.5.2 Earthin (grou din ) terminals 4

6.5.3 Me s rin circ it terminals 4

6.5.4 Sp cial markin s for terminals 4

6.6 In tru tion for u e 45 7 Pack ge 4

8 Test rules 4

8.1 Typ of test 4

8.2 Typ tests 4

8.3 Routine tests 4

8.4 Rec r ent tests 46 8.5 Non onformity clas ification 4

8.6 Ju gement of test res lts 4

An ex A (normative) Limits of intrin ic u certainty an variation 4

An ex B (informative) Relation hip b twe n ambient temp rature an relative h midity 51

An ex C (informative) Estimation of u certainties 5

C.1 Un ertainties in this stan ard 5

C.2 Op ratin u certainty 5

C.2.1 General 5

C.2.2 Estimatin a solute o eratin u certainty ac ordin to typ test res lts 5

C.2.3 Estimatin a solute o eratin u certainty ac ordin to l mit of intrin ic u certainty an l mit of variation d e to every influen e sp cified by this stan ard 5

C.3 Overal s stem u certainty 5

C.4 Fid cial o eratin u certainty 5

An ex D (normative) Routine Tests 5

Bibl ogra h 5

Fig re 1 – Me s rin ran e 10 A to 5 A 31

Fig re 2 – Me s rin ran e 8 V to 1 0 V 3

Fig re 3 – Me s rin ran es 0,0 MΩ to 0,4 M Ω an 0,1 MΩ to 2 MΩ 3

Fig re A.1 – Efect of temp rature 48 Fig re A.2 – Efect of temp rature 49 Fig re B.1 – Relation hip b twe n ambient temp rature and relative h midity 51

Fig re C.1 – Dif erent kin s of u certainty 5

Ta le 1 – Minimum IP req irements 2

Ta le 2 – Referen e con ition an toleran es for testin purp ses relatin to the

influen e q antities 2

Ta le 3 – Limits of the nominal ran e of u e an p rmis ible variation 26

Ta le 4 – The diameters of con u tive s rew an the diameters or the are of contact

s rface 3

Ta le 5 – Units, q antities an SI prefixes 3

Ta le 6 – Symb ls for markin in truments an ac es ories 3

INTERNATIONAL ELECTROTECHNICAL COMMISSION

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Pu lc tio s

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p te t rig ts IEC sh l n t b h ld resp nsible for id ntifyin a y or al su h p te t rig ts

International Stan ard IEC 6 0 1-1 has b en pre ared by IEC tec nical commite 8 :

Me s rin eq ipment for electrical an electromag etic q antities

This sixth edition can els an re laces the fifh edition publ s ed in 19 7 This edition

con titutes a tec nical revision

This edition in lu es the fol owin sig ificant tec nical c an es with resp ct to the previou

edition:

– ad in the EMC req irements;

– updatin the safety s mb ls an req irements ac ordin to new IEC 61010 series;

– re lacin the con e t of “er or to the con e t of “u certainty”;

– ad in service en ironment clas ification an clas ification by method of o eration,

mec anical con ition an the degre s of protection;

– ad in the req irements for tran p rt an storage of in truments an ac es ories

ac ordin to IEC 6 3 9;

– updatin the An exes to provide more information

The text of this stan ard is b sed on the fol owin doc ments:

Ful information on the votin for the a proval of this stan ard can b fou d in the re ort on

votin in icated in the a ove ta le

This publcation has b en drafed in ac ordan e with the ISO/IEC Directives, Part 2

A l st of al p rts in the IEC 6 0 1 series, publ s ed u der the general title Direct actn

indicatn a alogu e electrical me asu rin instrume ts a d th ir ac es ories, can b fou d on

the IEC we site

The commit e has decided that the contents of this publcation wi remain u c an ed u ti

the sta i ty date in icated on the IEC we site un er "htp:/we store.iec.c " in the data

related to the sp cific publ cation At this date, the publ cation wi b

IEC 6 0 1 is publ s ed in se arate p rts ac ordin to the fol owin stru ture an u der the

general title D irect actn indicatn a alogu e electrical me surin instru me nts a d th ir

ac es orie s

Part 1: Definition an General Req irements Common to al Parts

Part 2: Sp cial Req irements for Ammeters an Voltmeters

Part 3: Sp cial Req irements for Wat meters an Varmeters

Part 4: Sp cial Req irements for Freq en y Meters

Part 5: Sp cial Req irements for Phase Meters, Power Factor Meters an Sy c ros o es

Part 6: Sp cial Req irements for Ohmmeters (Imp dan e Meters) an Con u tan e Meters

Part 7: Sp cial Req irements for Multi- u ction In truments

Part 8: Sp cial Req irements for Ac es ories

Part 9: Recommen ed Test Method

Parts 2 to 9 are not complete in themselves an s al b re d in conju ction with this Part 1

Al of these p rts are ar an ed in the same format an a stan ard relation hip b twe n

s bject an clau e n mb r is maintained throu hout This re-ar an ement wi as ist the

re der of IEC 6 0 1 to distin uis information relatin to the dif erent typ s of in truments

DIRECT ACTING INDICATING ANALOGUE ELECTRICAL

Part 1: Definitions and general requirements common to al parts

This p rt of IEC 6 0 1 sp cifies definition an general req irements for direct actin

in icatin analog e electrical me s rin in truments an their ac es ories

This p rt a pl es to direct actin in icatin analog e electrical me s rin in truments, s c

as:

• ammeters an voltmeters;

• wat meters an varmeters;

• freq en y meters of p inter an vibratin -re d typ s;

• phasemeters, p wer- actor meters an s n hros o es;

• ohmmeters(imp dan e meters) an con u tan e meters;

• multi- u ction in truments of the a ove typ s

It also a pl es to:

• certain ac es ories u ed with these in truments, s c as:

– s u ts;

– series resistors an imp dan e elements;

• combination of the in truments an the ac es ories provided that the adju tments have

b en made for the combination;

• direct actin in icatin electrical me s rin in trument whose s ale marks do not

cor esp n directly to its electrical input q antity, provided that the relation hip b twe n

them is known;

• in truments an ac es ories havin electronic devices in their me s rin an /or au i ary

circ its

These series stan ard do not a ply to:

• sp cial purp se in truments whic are covered by their own IEC stan ard ;

• sp cial purp se devices whic are covered by their own IEC stan ard when they are

u ed as ac es ories

This stan ard do s not sp cify req irements con ernin dimen ion of in truments or

ac es ories ( or the former, se IEC 6 4 3)

2 Normativ referenc s

The folowin doc ments, in whole or in p rt, are normatively referen ed in this doc ment an

are in isp n a le for its a pl cation For dated referen es, only the edition cited a pl es For

u dated referen es, the latest edition of the referen ed doc ment (in lu in an

IEC 6 0 1-9, D irect actn indicatn a alogu e ele ctrical me surin instru me nts a d th ir

ac es orie s – Part 9: Recomme de d Te st Meth ds

1

IEC 6 3 9:2 01, Ele ctrical a d ele ctro ic m easureme t e u ip me t – Exp re ssio of

p rforma ce

IEC 6 5 9:2 13, Degre s of p rotecto p ro ided b y e closu res (IP Code )

IEC 6 7 1-3-3:19 4, Clas ificato of e viro me tal co di o s – Part 3: Clas ificato of

group s of e viro me tal p rameters a d th ir se ve ri es – Se cto 3: Stato ary u se at

we th rp rotected locato s

IEC 6 7 1-3-3/AMD1:19 5

IEC 6 7 1-3-3/AMD2:19 6

IEC 6 7 1-3-7:19 5, Clas ificato of e viro me tal co di o s – Part 3: Clas ificato of

grou p s of e viro me tal p aramete rs a d th ir se ve ri es – Secto 7: Portab le a d n

n-stato ary use

IEC 6 7 1-3-7/AMD1:19 6

IEC 61010-1:2 10, Safety re qu ireme nts for ele ctrical e u ip me t for me surem ent, co trol,

a d lab oratory use – Part 1: G e neralre qu ireme ts

IEC 61010-2-0 0:2 10, Safety re u irem ents for ele ctrical e u ip me t forme sureme nt, co trol,

a d lab oratory use – Part 2-030: Partcu lar re u irem ents for testn a d me surin circu its

IEC 613 6-1:2 12, Ele ctrical e quipm ent forme su reme t, co trola d lab oratory use – EMC

re qu ireme ts – Part 1: G ene ral re uireme ts

IEC 613 6-2-1:2 12, Ele ctrical e uip me t for me sureme t, co trol a d lab oratory use –

EMC re u ireme ts – Part 2-1: Partcu lar re u irem ents – Test co figu rato s, op erato al

co di o s a d p e rform ance crieria for se si v te st a d me surem ent e u ipme nt forEMC

unp rotected ap plcato s

ISO 7 0:19 7, Pack gin – Pictorial markin for h ndln of goods

Note 1 to e try: An instrume t in whic a c a g of th in ic tio o c rs b smal discrete ste s, b t whic d es

n t h v a digital displa , is c nsid re to b a a alo u displa instrume t

in trument havin a sin le me n of in ication inten ed for the me s rement of more than

one kin of q antity (e.g an in trument me s rin c r ent, voltage an resistan e)

3.1.6

fixed instrument

me s rin in trument desig ed to b p rmanently mou ted an whic is inten ed to b

con ected by me n of p rmanently in tal ed con u tors

[SOURCE: IEC 6 0 0-3 0:2 01, 312-0 -17]

3.1.7

porta le in trument

in trument sp cifical y desig ed to b car ied by han

Note 1 to e try: Th instrume t is inte d d to b c n e te a d disc n e te b th user

me s rin in trument in whic the me s rin element is, by desig , u afected by u iform

mag etic field of external origin

in trument whic in icates the phase an le b twe n two electrical input q antities of the

same freq en y an of simi ar waveform

Note 1 to e try: Su h a instrume t me sures:

– th p ase a gle b twe n a v lta e a d a oth r v lta e or b twe n ac r e t a d a oth r c r e t,

in trument inten ed to in icate that two alternatin voltages or p lyphase voltage s stems

have the same freq en y an are in phase

[SOURCE: IEC 6 0 0-3 0:2 01, 313-01-2 ]

3.1.2

ac es ory

element, group of elements or device as ociated with the me s rin circ it of a me s rin

in trument in order to confer sp cified c aracteristic to the me s rin in trument

interc ange ble ac es ory

ac es ory havin its own pro erties an ac urac , these b in in e en ent of those of the

in trument with whic it may b as ociated

Note 1 to e try: An a c s ory is c nsid re to b interc a g a le wh n its rate c ara teristics are k own a d

mark d a d are suficie t to e a le its erors a d v riatio s to b d termin d with ut usin th as o iate

instrume t A sh nt wh se a justme t ta es into a c u t a instrume t c re t whic is n t n glgible a d whic is

k own, is c nsid re to b interc a g a le

3.1.2

ac es ory of l mited interc ange bi ty

ac es ory havin its own pro erties an ac urac , whic can only b as ociated with

me s rin in truments for whic certain c aracteristic are within sp cified l mits

resistor con ected in p ral el with a me s rin circ it of a me s rin in trument

Note 1 to e try: A sh nt is g n raly inte d d to pro id a v lta e pro ortio al to a c re t to b me sure

3.1.2

series resistor (impedance)

resistor (imp dan e) con ected in series with a me s rin circ it of a me s rin in trument

Note 1 to e try: A series resistor (imp d n e) is g n raly inte d d to e te d th v lta e me surin ra g of a

instrume t

3.1.2

instrument le d

le d comprisin one or more con u tors, sp cialy desig ed for intercon ectin me s rin

in truments to external circ its or to ac es ories

3.1.2

cal brated in trument le d

in trument le d whose resistan e has a sp cified value

Note 1 to e try: A c lbrate instrume t le d is c nsid re as b in a interc a g a le a c s ory of a me surin

3.2 Des ription of instruments ac ording to their method of operation

3.2.1

permanent magnet moving-coi instrument

in trument whic o erates by the interaction of the mag etic field d e to a c r ent in a

mova le coi with the field of a fixed p rmanent mag et

Note 1 to e try: Th instrume t c n h v more th n o ec i me surin th sum or ratio of th c re tsin th m

3.2.2

movin -mag et instrument

in trument whic o erates by the interaction of the field of a mova le p rmanent mag et with

the mag etic field d e to a c r ent in a fixed coi

Note 1 to e try: Th instrume t c n h v more th n o ec i

3.2.3

movin -iron instrument

in trument whic o erates by the at raction b twe n a mova le piece of sof mag etic

material an the field d e to a c r ent in a fixed coi or by the re ulsion (an at raction)

b twe n one (or more) fixed piece(s) of sof mag etic material an a mova le piece of sof

mag etic material, b th (al ) mag etized by a c r ent in a fixed coi

3.2.4

polarized movin -iron instrument

in trument comprisin a mova le piece of sof mag etic material p larized by a fixed

p rmanent mag et an mag etical y ex ited by a c r ent in a fixed coi

3.2.5

electrody amic instrument

in trument whic o erates by the interaction of the mag etic field d e to a c r ent in a

mova le coi with the mag etic field d e to a c r ent in one or more fixed coi s

3.2.6

fer ody amic instrument (iron-cored electrody amic instrument

electrod namic in trument in whic the electrod namic ef ect is modified by the presen e of

sof mag etic material in the mag etic circ it

3.2.7

ind ction in trument

in trument whic o erates by the interaction of the mag etic field(s) of (a) fixed a.c

electromag et s) with the mag etic field(s) d e to c r ents whic they in u e in (a) mova le

con u tive element s)

3.2.8

thermal instrument (electrothermal instrument

in trument whic o erates by the he tin ef ect s) of (a) c r ent s) on it s) con u tor(s)

3.2.8.1

bimetal ic instrument

thermal in trument in whic the deformation of a bimetal c element ( he materials havin

dif erent rates of exp n ion d e to a c an e in temp rature), he ted directly or in irectly by a

c r ent, prod ces the in ication

3.2.9

rectifier instrument

in trument whic is the combination of a me s rin in trument sen itive to direct c r ent an

a rectifyin device where y alternatin c r ents or voltages may b me s red

pointer- ype frequenc meter

in trument whic in icates the me s red freq en y by the relation hip b twe n an in ex an

a s ale

3.2.12

vibrating-re d frequenc meter

in trument inten ed to me s re freq en y, comprisin a set of tu ed vibratin re d , one or a

few of whic resonate un er the action of an alternatin c r ent of the relevant freq en y

flowin throu h one or more fixed coi s

in trument whic , over a sp cified freq en y ran e, provides an in ication whic is desig ed

to b pro ortional to the ro t me n-s uare value of the me s red q antity, even when it is not

sin soidal or containin a d.c p rt

3.2.15

me n value-respondin instrument

in trument with s ale of R.M.S value but whic , over a sp cified freq en y ran e, provides an

in ication whic is desig ed to b pro ortional to the me n value of the me s red q antity

Note 1 to e try: Th se instrume ts d n t refle t R.M.S v lu of a me sura d wh n th me sura d is n t

sin soid l or c ntainin a d.c p rt

3.3 Constructional fe tures of instruments

3.3.1

me s ring circ it (of an instrument

p rt of the electrical circ it internal to the in trument an its ac es ories, together with the

intercon ectin le d , if an , whic is energized by a voltage or a c r ent, one or b th of

these quantities b in a prime factor in determinin the in ication of the me s red q antity

(one of these q antities may b the me s red q antity itself

3.3.1.1

c r ent circ it

me s rin circ it throu h whic flows a c r ent whic is a prime factor in determinin the

in ication of the me s red q antity

Note 1 to e try: It ma b th c r e t dire tly in olv d in th me sureme t or a pro ortio al c re t su ple b

a e tern l c re t tra sformer or d riv d from a e tern l sh nt

Note 1 to e try: It ma b th v lta e dire tly in olv d in th me sureme t or a pro ortio al v lta e su ple b

a e tern l v lta e tra sformer or a e tern l v lta e divid r or d riv d b me ns of a e tern l series resistor

as embly of those p rts of a me s rin in trument whic are acted up n by a me s red

q antity, res ltin in a movement of the movin element related to that q antity

eq i brium p sition whic the in ex wi a pro c when the me s rin element (if

mec anical y control ed) is de-energized

Note 1 to e try: This ma or ma n t c in id with th zero sc le mark

Note 2 to e try: In me h nic ly su pres e zero instrume ts, th me h nic l zero d es n t c resp n to a

sc le mark

Note 3 to e try: In instrume ts with ut restorin torq e th me h nic l zero is in etermin te

3.3.15.1

mec anical zero adjuster

mec anism by me n of whic the in trument may b adju ted so that the mec anical zero

coin ides with the a pro riate s ale mark

3.3.15.2

mec anical sp n adjuster

mec anism by me n of whic the in trument may b adju ted so that the lower/up er l mit of

the me s rin ran e coin ides with the a pro riate s ale mark

3.3.16

electrical zero

eq i brium p sition whic the in ex wi a pro c when the meas red electrical q antity is

either zero or a set value and the control circ it (if an ), prod cin a restorin torq e, is

energized

3.3.16.1

electrical zero adju ter

for an in trument whic ne d an au i ary s p ly, the mec anism by me n of whic the

in trument may b adju ted so that the electrical zero coin ides with the a pro riate s ale

mark

3.3.16.2

electrical span adjuster

for an in trument whic ne d an au i ary s p ly, the mec anism by me n of whic the

in trument may b adju ted so that the lower/up er lmit of the me s rin ran e coin ides

with the a pro riate s ale mark

3.4 Characteristic fe tures of instruments

3.4.1

s ale length

len th of the l ne (c rved or straig t whic p s es throu h the centres of al the s ortest

s ale marks contained b twe n the first an the last s ale marks

Note 1 to e try: It is e pres e in u its of le gth

Note 2 to e try: If a instrume t h s more th n o e sc le, e c sc le ma h v its own sc le le gth For

c n e ie c , th sc lele gth of th instrume t is ta e to b th t of th major sc le

3.4.2

span

alge raic dif eren e b twe n the up er an lower l mits of the me s rin ran e

Note 1 to e try: It is e pres e in u its of th me sure q a tity

3.4.3

me s ring ran e (ef ective range)

ran e defined by two values of the me s red q antity within whic the l mits of u certainty of

a me s rin in trument (an /or ac es ory) are sp cified

Note 1 to e try: A me surin instrume t (a d/or a c s ory) c n h v se eral me surin ra g s

3.4.4

residual deflection

p rt of the deflection of a mec anical y controled movin element whic remain afer the

cau e prod cin it has disa p ared an al the me s rin circ its are de-energized

3.4.5

overs oot

dif eren e b twe n the extreme in ication an the ste d in ication (expres ed in terms of

the s ale len th) when the me s red q antity is a ruptly c an ed from one ste d value to

another

3.4.6

resp nse time

time ta en for the in ication to first re c an then remain within a b n centred on the final

ste d in ication when the me s red q antity is a ruptly c an ed from zero ( he u energized

con ition) to a value s c that the final ste d in ication is a sp cified pro ortion of the s ale

len th

3.5 Characteristic values

3.5.1

nominal value

value of a q antity in icatin the inten ed u e of an in trument or ac es ory The inten ed

c aracteristic of in truments an ac es ories are also nominal values

cle rly sp cified value of a q antity to whic the u certainty(ies) of an in trument an /or an

ac es ory are refer ed in order to sp cify their resp ctive ac uracies

Note 1 to e try: This v lu c n b , for e ample, th u p r lmit of th me surin ra g , th sp n or a oth r

Note 1 to e try: Th v lu as ume b a q a tity su je te to me sureme t wh n it is n t intera tin with th

me surin instrume t ma b c le u p rturb d v lu of th q a tity

Note 2 to e try: Th u p rturb d v lu a d its as o iate u c rtainty c n o ly b c mp te thro g a mo el of

th me sure system a d of th me sureme t intera tio with th k owle g of th a pro riate metrolo ic l

c ara teristics of th instrume t, th t ma b c le instrume tal lo d

[SOURCE: IEC 6 3 9:2 01, 3.1.1]

3.6.2

influence quantity

q antity whic is not the s bject of the me s rement an whose c an e afects the

relation hip b twe n the in ication an the res lt of the me s rement

Note 1 to e try: Influ n e q a tities c n origin te from th me sure system, th me surin e uipme t or th

e viro me t

Note 2 to e try: As th c lbratio dia ram d p n s o th influ n e q a tities, in ord r to as ig th result of a

me sureme t it is n c s ary to k ow wh th r th rele a t influ n e q a tities le within th sp cifie ra g

Note 3 to e try: An influ n e q a tity is said to le within a ra g C' to C" wh n th results of its me sureme t

satisfy th relatio ship: C' ≤V-U< V + U≤C"

[SOURCE: IEC 6 3 9:2 01, 3.1.14]

3.6.3

referen e con itions

a pro riate set of sp cified values an /or ran es of values of influen e q antities u der whic

the smal est p rmis ible u certainties of a me s rin in trument are sp cified

Note 1 to e try: Th ra g s sp cifie for th refere c c n itio s, c le refere c ra g s, are n t wid r, a d are

usu ly n rower, th n th ra g s sp cifie for th rate o eratin c n itio s

nominal range of u e or rated operatin range （for influ nc q a tities）

sp cified ran e of values whic an influen e q antity can as ume without cau in a variation

extreme values whic an influen e q antity can as ume d rin o eration without damagin

the in trument so that it no lon er me ts its p rforman e req irements when it is

s bseq ently o erated u der referen e con ition

Note 1 to e try: Th lmitin v lu s c n d p n o th d ratio of th ir a plc tio

[SOURCE: IEC 6 3 9:2 01, 3.3.16]

3.6.8

preconditioning

action where y a sp cified value of the me s red q antity is a pl ed to the me s rin circ it

prior to car yin out testin or u e of the in trument or ac es ory

3.6.9

storage and transport conditions

extreme con ition whic a non-o eratin me s rin in trument can with tan without

damage an without degradation of its metrological c aracteristic when it is s bseq ently

o erated u der its rated o eratin con ition

[SOURCE: IEC 6 3 9:2 01, 3.3.17]

3.6.10

l miting values for storage

extreme values whic an influen e q antity can as ume d rin storage without damagin the

me s rin in trument so that it no lon er me ts its p rforman e req irements when it is

s bseq ently o erated u der referen e con ition

Note 1 to e try: Th lmitin v lu s c n d p n o th d ratio of th ir a plc tio

[SOURCE: IEC 6 0 0-3 0:2 01, 31 -0 -0 ]

3.6.1

l miting values for tran port

extreme values whic an influen e q antity can as ume d rin tran p rt without damagin

the me s rin in trument so that it no lon er me ts its p rforman e req irements when it is

s bseq ently o erated u der referen e con ition

Note 1 to e try: Th lmitin v lu s c n d p n o th d ratio of th ir a plc tio

[SOURCE: IEC 6 0 0-3 0:2 01, 31 -0 -0 ]

3.7 Uncertainty and variations

3.7.1

(a solute) instrumental u certainty

u certainty of the res lt of a direct me s rement of a me s ran havin negl gible intrin ic

u certainty

Note 1 to e try: Unles e plcitly state oth rwise, th instrume tal u c rtainty is e pres e as a interv l with

c v ra e fa tor 2

Note 2 to e try: In sin le-re din dire t me sureme ts of me sura ds h vin intrinsic u c rtainty smal with

resp ct to th instrume tal u c rtainty, th u c rtainty of th me sureme t c in id s, b d finitio , with th

instrume tal u c rtainty Oth rwise th instrume tal u c rtainty is to b tre te as a c mp n nt of c te ory B in

e alu tin th u c rtainty of th me sureme t o th b sis of th mo el c n e tin th se eral dire t

me sureme ts in olv d

Note 3 to e try: Th instrume tal u c rtainty a tomatic ly in lu es, b d finitio , th efe ts d e to th

q a tizatio of th re din -v lu s (minimum e alu ble fra tio of th sc le interv l in a alo ic o tp ts, u it of th

last sta le digit in digital o tp ts)

Note 4 to e try: For material me sures th instrume tal u c rtainty is th u c rtainty th t sh uld b as o iate

to th v lu of th q a tity re ro u e b th material me sure in ord r to e sure th c mp tibi ty of th results of

its me sureme ts

Note 5 to e try: Wh n p s ible a d c n e ie t th u c rtainty ma b e pres e in th relativ form (se 3.3.3)

or in th fid cial form (se 3.3.4) Th relativ u c rtainty is th ratio U/V of th a solute u c rtainty U to th

me sure v lu V, a d th fid cial u c rtainty is th ratio U/V

[SOURCE: IEC 6 3 9:2 01, 3.1.12]

3.7.2

conventional value

me s re-value of a stan ard u ed in a cal bration o eration an known with u certainty

negl gible with resp ct to the u certainty of the in trument to b cal brated

Note 1 to e try: This d finitio is a a te to th o je t of this sta d rd from th d finitio of "c n e tio al tru

v lu (of a q a tity)": v lu atrib te to a p rtic lar q a tity a d a c pte , sometimes b c n e tio , as h vin

a u c rtainty a pro riate for a giv n p rp se

operating instrumental u certainty

in trumental u certainty u der the rated o eratin con ition

Note 1 to e try: Th o eratin instrume tal u c rtainty, lk th intrinsic o e, is n t e alu te b th user of th

instrume t, b t is state b its ma ufa turer or c lbrator Th stateme t ma b e pres e b me ns of a

alg braic relatio in olvin th intrinsic instrume tal u c rtainty a d th v lu s of o e or se eral influ n e

q a tities, b t su h a relatio is just a c n e ie t me ns of e pres in a set of o eratin instrume tal

u c rtainties u d r difere t o eratin c n itio s, n t a fu ctio al relatio to b use for e alu tin th

pro a atio of u c rtainty insid th instrume t

Note 1 to e try: A lmit of u c rtainty ma b as ig e b th ma ufa turer of th instrume t, wh states th t

u d r th sp cifie c n itio s th instrume tal u c rtainty is n v r hig er th n this lmit, or ma b d fin d b

sta d rds, th t prescrib th t u d r sp cifie c n itio s th instrume tal u c rtainty sh uld n t b larg r th n this

lmit for th instrume t to b lo g to a giv n a c ra y clas

Note 2 to e try: A lmit of u c rtainty ma b e pres e in a solute terms or in th relativ or fid cial forms

[SOURCE: IEC 6 3 9:2 01, 3.3.6]

3.7.6

variation (d e to an influence quantity)

dif eren e b twe n the in icated values for the same value of the me s ran of an in icatin

in trument, or the values of a material me s re, when an influen e q antity as umes,

s c es ively, two diferent values

Note 1 to e try: Th u c rtainty as o iate with th difere t me sure v lu s of th influ n e q a tity for whic

th v riatio is e alu te sh uld n t b wid r th n th width of th refere c ra g for th same influ n e q a tity

Th oth r p rforma c c ara teristics a d th oth r influ n e q a tities sh uld sta within th ra g s sp cifie for

3.8 Ac uracy, ac urac clas and clas index

3.8.1

ac urac

for a me s rin in trument, the q al ty whic c aracterizes the closenes of the in icated

value to the true value

for an ac es ory, the q alty whic c aracterizes the closenes of the mark d (inten ed)

value to the true value

Note 1 to e try: Th a c ra y of a me surin instrume t or of a a c s ory is d fin d b th lmits of intrinsic

eror e d b th lmits of v riatio s

3.8.2

ac urac clas

clas of me s rin in truments, al of whic are inten ed to comply with a set of

sp cification regardin u certainty

Note 1 to e try: An a c ra y clas alwa s sp cifies a lmit of u c rtainty ( or a giv n ra g of influ n e

q a tities), wh te er oth r metrolo ic l c ara teristics it sp cifies

Note 2 to e try: An instrume t ma b as ig e to difere t a c ra y clas es for difere t rate o eratin

the n mb r whic desig ates the ac urac clas

Note 1 to e try: Some instrume ts a d/or a c s ories ma h v more th n o e clas in e

4 De cription, classification and compliance

4.1 Des ription

4.1.1 Des ription ac ordin to methods of o eration or nature

In truments an /or ac es ories s al b des rib d ac ordin to their method of o eration or

their nature as given in clau e 3 an /or by their sp cial c aracteristic as given in the relevant

p rts

4.1.2 Des ription ac ordin to environmental con itions

In truments an /or ac es ories s al b des rib d ac ordin to their en ironmental con ition

as fol ows:

• Group A: for u e u der con ition whic are normal y fou d in la oratories an factories

an where a p ratu wi b han led careful y, the nominal ran e of u e for temp rature is

referen e temp rature ±10 °C or lower l mit of referen e ran e –10 °C an up er l mit of

referen e ran e +10 °C;

• Group B: for u e in en ironments havin protection from ful extremes of en ironment, the

nominal ran e of u e for temp rature is -5 °C to + 5 °C ( ixed in trument an /or

ac es ory: clas 3K5 ac ordin to IEC 6 7 1-3-3:19 4, Amen ment 2:19 6; p rta le

in trument an /or ac es ory: clas 7K2 ac ordin to IEC 6 7 1-3-7:19 5, Amen ment

1:19 6);

• Group C: for outdo r u e an u e u der con ition that the ambient temp rature c an es

b dly, the nominal ran e of u e for temp rature is -2 °C to +5 °C (clas 3K6 ac ordin

to IEC 6 7 1-3-3:19 4, Amen ment 2:19 6)

The nominal ran e of u e for temp rature for tor id typ in truments s ould b determined by

agre ment b twe n man facturer an c stomer ac ordin to IEC 6 7 1-3-3:19 4,

Amen ment 2:19 6

4.1.3 Des ription ac ordin to mec anical conditions

Based on their mec anical con ition , in truments an /or ac es ories may b des rib d as

Man facturer s al state the degre s of protection in the in tru tion man al

In ad ition, clas in ices 1,5, 2,5 an 3 may b u ed for in truments, clas in ex 0,15 for

freq en y meters an clas in ex 0,3 for ac es ories

4.3 Compl ance with the requirements of this stan ard

4.3.1 In truments an ac es ories mark d with a clas in ex s al comply with the

relevant req irements of this stan ard relatin to their clas in ex

4.3.2 The recommen ed test method for c eckin complan e with the req irements of

this stan ard are given in IEC 6 0 1-9

In case of dispute, the test method of IEC 6 0 1-9 are refere method

4.3.3 If, for the determination of intrin ic u certainty precon itionin is sp cified, the

man facturer s al state the precon itionin p riod an the value(s) of the me s red

q antity(ies) The precon itionin p riod s al not ex e d 3 min

5 Re uirements

5.1 Reference conditions

5.1.1 The referen e values of the influen e q antities s ould b as given in Ta le 2

5.1.2 Referen e con ition dif erent from those given in Ta le 2 may b sp cified, but they

s al then b mark d in ac ordan e with Clau e 6

5.1.3 The referen e value for the ambient temp rature diferent from those given in

Ta le 2 s al b selected from 2 °C or 2 °C

5.2 Limits of intrinsic uncertainty, fiducial value

5.2.1 Limits of intrinsic uncertainty

When the in trument together with its non-interc an e ble ac es ory(ies) (if an ) or

ac es ory is u der the referen e con ition given in Table 2 an is u ed b twe n the l mits of

its me s rin ran e an in ac ordan e with the in tru tion man als, the intrin ic u certainty,

expres ed as a p rcentage of the fid cial value, s al not ex e d the l mits a pro riate to its

ac urac clas Values stated in a ta le of cor ection s p l ed with the in trument or

ac es ory s al not b ta en into ac ou t in determinin the u certainty

NOT 1 Th intrinsic u c rtainty in lu es oth r u c rtainties su h as th se d e to frictio , amplfier drif, etc

NOT 2 Th a c ra y clas es relatin to e c ty e of instrume t or a c s ory are giv n inth a pro riate p rts

5.2.2 Cor espon ence betwe n intrinsic un ertainty and ac urac clas

The maximum p rmis ible u certainty can b related to the ac urac clas s c that the clas

in ex is u ed as the lmit of u certainty, expres ed as a p rcentage

NOT For e ample, for a clas in e of 0,0 , th lmits of intrinsic u c rtainty are ± ,0 % of th fid cial v lu

Ta le 2 – Reference condition and tolerances

r.m.s.-resp n in instrume ts

a d instrume ts whic emplo

p ase-shifin n tworks in th ir

me surin circ its: distortio

Th se tolera c s a ply wh n a sin le refere c v lu is sp cifie in this ta le or is mark d b th

ma ufa turer.For arefere c ra g , n tolera c is alowe

b

Instrume ts pro id d with a le el in ic tor sh l b teste with th instrume t set le el usin th le el

in ic tor

c

Th se symb ls (or la k of symb l) refer to th n ture a d thic n s of th p n l or su p rt o whic th

instrume t is mo nte Se Ta le 6

5.3.1.2 When a man facturer as ig s an marks a nominal ran e of u e whic is diferent

from that s own in Ta le 3, it s al in lu e the referen e ran e (or referen e value with

p rmited toleran es) an wi normaly ex e d it in at le st one direction

5.3.1.3 For values in the nominal ran e of u e b yon the referen e ran e (or referen e

value), the p rmis ible variation is as stated in Ta le 3

EX MPLE For a instrume t h vin a clas in e of 0,2, th v riatio d e to a la k of le el of 5° in a y dire tio

sh l n t e c e :

( ) 0,1 %ofthefid cialvalue

1050

%

5.3.1.4 When the influen e q antity is not one of those s own in Ta le 3, the relevant

p rmis ible variation s al b stated by the man facturer an s al not ex e d 10 % of the

clas in ex

5.3.1.5 For the in truments an ac es ories with sp cified referen e ran e, the intrin ic

u certainty an the variation d e to influen e q antity in the nominal ran e of u e s al b

Ta le 3 – Limits of the nominal range of u e and permis ible variations

Ambie t temp rature

Gro p A: refere c temp rature

Ma n tic fieldof e tern l origin Se 5.3.2.2 a d th rele a t p rts

Ele tric field of e tern l origin

(ele trostatic instrume ts o ly)

This is th temp rature c eficie t whic is th p rmis ible v riatio c use b

temp rature c a g d p r 10K relativ to th refere c temp rature (refere c

temp rature ra g ) in n min ltemp rature ra g

b

Instrume ts pro id d with a le el in ic tor sh l alwa s b set c re tly for p sitio usin

th le el in ic tor Th se instrume ts n e n t th refore b teste for v riatio d e to

5.3.2 Limits of variations

When an in trument or an ac es ory is u der referen e con ition and a sin le influen e

q antity is varied, the variation s al not ex e d the values given in Ta le 3 an in 5.3.2.2,

5.3.2.3, 5.3.2.4 an 5.3.2.5

5.3.2.2 Variation due to a magnetic field of external origin

a) When the in trument is not mark d with s mb l F-2 (Ta le 6), the mag etic field stren th

in the test eq ipment s al b 0,4 kA/m

b) For in truments mark d with s mb l F-2 (Ta le 6), the mag etic field stren th in the test

eq ipment s al have a value in ki o mp res p r metre as s own in the s mb l

c) Un er the con ition of a) an b), the variation s al not ex e d the l mits given in the

relevant p rts

For the recommen ed test, se IEC 6 0 1-9

5.3.2.3 Variation due to an electric field of external origin (electrostatic instruments

only)

The variation d e to an electric field of external origin at d.c an 4 Hz to 6 Hz, havin a

stren th of 2 kV/m an u der the most u favoura le con ition of phase an orientation,

s al not ex e d 10 % of the clas in ex

If the in trument is mark d with s mb l F-3 (Ta le 6), the field stren th is made eq al to the

value given in the s mb l

For the recommen ed test, se IEC 6 0 1-9

5.3.2.4 Variation due to fer omagnetic s pports

The u certainty of in truments whic are mou ted on a p nel of the nature an thicknes

impl ed by the relevant s mb l F-3 , F-3 or F-3 or on a p nel of an nature an thicknes

when not so mark d – s al remain within the l mits of the intrin ic u certainty

There is no req irement of variation d e to fer omag etic s p ort for in truments mark d with

s mb l F-3

When X in F-3 is diferent from the value sp cified in IEC 6 0 1-9, variation d e to

fer omag etic s p orts s al not ex e d 5 % of the clas in ex

For the recommen ed test, se IEC 6 0 1-9

5.3.2.5 Variation due to con uctive s pports

In truments s al me t the req irements for intrin ic u certainties relatin to their clas in ex

when u ed on a p nel or s p ort of hig con u tivity u les other req irements are given in a

se arate doc ment an are s own by markin with s mb l F-31 (Ta le 6)

For the recommen ed test, se IEC 6 0 1-9

5.3.3 Condition for the determination of variations

5.3.3.1 If precon itionin is sp cified for the determination of variation , the man facturer

s al state the precon itionin p riod an the value(s) of the me s red q antity(ies) an of

the au i ary s p ly, if an

The precon itionin p riod s al not ex e d 3 min

5.3.3.2 The variation s al b determined for eac influen e q antity se arately

Durin e c test al influen e q antities s al b maintained at their referen e con ition

ex e t for the influen e q antity for whic the variation s al b determined

5.3.3.3 When an influen e q antity has a referen e value, the influen e q antity s al b

varied b twe n that value an an value within the l mits of the nominal ran e of u e as given

in Ta le 3, u les otherwise mark d

5.3.3.4 When an influen e q antity has a referen e ran e, the influen e q antity s al b

varied from e c l mit of the referen e ran e to the adjacent l mit of the nominal ran e of u e

5.4 Operating uncertainty, overal s stem uncertainty an variations

5.4.1 Un er non-referen e con ition , the o eratin u certainty of an in trument together

with its non-interc an e ble ac es ory(ies) (if any) or that of an ac es ory is the comp site of

the intrin ic u certainty an the variation d e to every influen e q antity In normal ran e of

u e, the maximum o eratin u certainty of in trument is the comp site of the intrin ic

u certainty an the p rmis ible variation in icated in Ta le 3 Refer to An ex C for their

relation hip

5.4.2 For the in trument u ed together with its external interc an e ble ac es ory,

in trument, ac es ory an le d con titute a s stem, an the overal s stem u certainty

de en s on their resp ctive intrin ic u certainty an variation Refer to An ex C for their

5.5.2.1 In truments, together with their non-interc an e ble ac es ories (if an ),

interc an e ble ac es ories an ac es ories of l mited interc an e bi ty s al comply with

the req irements cor esp n in to their clas in ex afer b in contin ou ly o erated at an

time afer the completion of the sp cified precon itionin p riod (if an )

For testin :

• in truments s al b energized to give an in ication of a out 9 % of the up er l mit of the

me s rin ran e;

• s u ts s al b energized at a out 9 % of their nominal value;

• series resistors (impedan es) s al b energized at a out 9 % of their rated values

5.5.2.2 The variation s al not ex e d the value cor esp n in to 10 % of the clas in ex

Nonetheles , the in trument, together with its ac es ories, s al also comply with the

req irements relatin to its clas in ex

5.5.2.3 In truments an ac es ories inten ed for intermitent u e (e.g those provided with

a non-lockin switc ) are ex lu ed from the req irements relatin to self he tin

The req irements of 5.5.2.1, 5.5.2.2 an 5.5.2.3 do not a ply to ohmmeters

5.5.2.4 For the recommen ed test, se IEC 6 0 1-9

5.5.3 Permis ible overlo ds

5.5.3.1 Continuou overload

Req irements for contin ou overlo d are given in the relevant p rts

5.5.3.2 Overloads of s ort duration

Req irements for overlo d of s ort d ration are given in the relevant p rts

5.5.4 Limitin range of temperature

5.5.4.1 Limitin ran e for o eration

Unles otherwise sp cified, in truments an /or ac es ories s al o erate without in ur in

p rmanent damage when s bjected to the ambient temp ratures stated b low:

• Group A : -5 °C to + 4 °C ( 7K 2 );

• Group B: -2 °C to + 5 °C ( 3K 6 );

• Group C: -4 °C to + 7 °C ( 3K 7 );

• In truments whic in or porate b teries: -2 °C to + 5 °C ( 3K 6 );

• Tor rid typ : t he o er atin ran e of temp rature may b determined by agre ment b t we n the

u er an man factur er

5.5.4.2 Limitin ran e for storage an tran p rt

The non-o eratin in trument an /or ac es ories d rin their storage or tran p rt s al

with tan the temp rature with – 4 °C to + 7 °C without damage an without degradation of

their metrological c aracteristic when they are s bseq ently o erated u der its rated

o eratin con ition

5.5.4.3 Absen e of p rmanent damage is infer ed if, on return to referen e con ition , the

in truments an /or ac es ories comply with the req irements relatin to intrin ic u certainty

Immu ity req irements s al b selected from Ta le 1 of IEC 613 6-1:2 12 for p rta le

in truments an from Ta le 2 of IEC 613 6 -1:2 12 for fix in tal ed in truments

Emis ion req irements ac ordin Clau e 7 of IEC 613 6-1:2 12 s al b a pl ed only for

in truments an ac es ories with emit in electronic comp nents in their me s rin an /or

au i ary circ its The es ential information of the emit in electronic comp nents, as b sis for

determinin whether or not to car y out emis ion test, s al b given by the man facturer in a

se arate doc ment

5.6 Constructional requirements

5.6.1 General con tructional requirements

An in trument an /or an ac es ory s al not cau e a dan er to the operator when in

service an u der normal o eratin con ition

Al p rts whic may b s bject to cor osion u der normal o eratin con ition s al b

protected efectively Un er normal o eratin con ition , an protective co tin s al not b

l a le to damage by ordinary han l n nor d e to exp s re to air

The in truments an /or ac es ories for group C s al with tan solar radiation

NOT For sp cial instrume ts a d a c s ories use in c rosiv atmosp eres, a ditio al re uireme ts are state

in th p rc ase c ntra t (e.g salt mist test a c rdin to IEC 6 0 8-2-1 )

5.6.2 Damping

The dampin of in truments, ex e t for in truments havin an intentional y lon resp n e

time, an u les otherwise sp cified in the relevant p rt, s al comply with the folowin

req irements

5.6.2.2 Overs oot

For in truments havin a total an ular deflection of les than 18 °, the mec anical overs o t

s al not ex e d 2 % of the s ale len th For other in truments, the l mit s al b

For the recommen ed test, se IEC 6 0 1-9

5.6.2.3 Response time

Unles otherwise agre d b twe n the man facturer an the u er, the de arture of the in ex

from the p sition of rest s al not ex e d 1,5 % of the s ale len th at an time af er 4 s

fol owin the s d en a pl cation of an ex itation prod cin a c an e of final in ication of

two-third of the s ale len th

For the recommen ed test, se IEC 6 0 1-9

5.6.2.4 Impedance of the external me s rin circ it

When the c aracteristic of the circ it into whic the in trument is con ected may afect the

dampin , the external circ it imp dan e s al b as stated in the relevant p rt or otherwise

The division s al b a pro riate to the in ex of clas of the in trument, namely the

u certainty of estimate value by vis al s al not ex e d the sp cification for clas in ex

5.6.4.2 Scale numb ring

The n merals of the s ale (whole n mb r or decimal) mark d on the dial s ould prefera ly

not have more than thre digits SI u its an their prefixes s ould b u ed in as ociation with

the s ale n mb rin

5.6.4.3 Direction of deflection

The direction of deflection of the in ex of an in trument s al b from lef to rig t or from

b t om to to with in re sin me s red q antity

When the an ular deflection of the in ex ex e d 18 °, the deflection with in re sin

me s red q antities s ould b clockwise

5.6.4.4.2 When the value of the s ale division or the nature of the s ale marks ena les the

me s rin ran e to b identified with minimal ambig ity, no markin is neces ary An

example of this method is given in Fig re 1

NOT Su divisio s are omite o tsid th me surin ra g

Fig re 1 – Me s rin range 10 A to 5 A

IEC A

01023

5.6.4.4.3 When there is only one s ale an markin is neces ary, the l mits of the

me s rin ran e s al b identified by me n of smal fi ed-in dots An example of this

method is given in Fig re 2

The p sition of sto p r of an in trument s al not b coin ident with that of up er an lower

s ale marks of me s rin ran e The len th of sto p r outside the s ale s al b not les

than 2 % of the s ale len th

5.6.6 Prefer ed values

The prefer ed values s al b u ed in the a sen e of a sp cial agre ment b twe n the

man facturer an the u er

Req irements for prefer ed values are given in the relevant p rts

5.6.7 Adjusters, mec anical an /or electrical

5.6.7.1 Zero adjuster(s)

When an in trument is fit ed with zero adju ter(s), inten ed for u e by the u er, it is

prefera le that it they) b ac es ible from the front of the case

The total ran e of adju tment s al b not les than 2 % of the s ale len th or 2°, whic ever

is the les , an the finenes of set in s al b a pro riate to the clas in ex of the

in trument

NOT By "a pro riate", it is u d rsto d th t th fin n s of th setin is su h as to p rmit se in to within 1/5 of

th clas in e

For in truments where the efective centre of rotation can ot re diy b determined, the

req irement relatin to 2° is not a pl ca le

IEC V

0589

0,50,40,3

The ratio b twe n the hig er an lower ran es of adju tment on either side of the zero mark

s al not b gre ter than 2

For the recommen ed test, se IEC 6 0 1-9

5.6.7.2 Sp n adjuster(s)

When an in trument is fit ed with sp n adju ter(s), inten ed for u e by the u er, it is

prefera le that it they) b ac es ible from the front of the case

The total ran e of adju tment s al b not les than 2 % of the s ale len th or 2°, whic ever

is the les , an the finenes of set in s al b a pro riate to the clas in ex of the

in trument

NOT By “a pro riate", it is u d rsto d th t th fin n s of th setin is su h as to p rmit setin to within 1/5 of

th clas in e

For in truments where the efective centre of rotation can ot re diy b determined, the

req irement relatin to 2° is not a pl ca le

The ratio b twe n the hig er an lower ran es of adju tment on either side of the zero mark

s al not b gre ter than 2

For the recommen ed test, se IEC 6 0 1-9

5.6.8 Ef ects of vibration an s ock

5.6.8.1 Vibration test

Unles otherwise sp cified, in truments an ac es ories of clas in ices 1 an gre ter s al

b ca a le of with tan ing the vibration test sp cified in IEC 6 0 1-9

The variation d e to the efect of vibration s al not ex e d a value cor esp n in to 10 % of

the clas in ex

The recommen ed test, se IEC 6 0 1-9

5.6.8.2 Shock test

Unles otherwise agre d, in truments an ac es ories of clas in ices 1 an gre ter s al b

ca a le of with tan in the s ock test sp cified in IEC 6 0 1-9

The variation d e to the ef ect of s ock s al not ex e d a value cor esp n in to 10 % of

the clas in ex

The recommen ed test, se IEC 6 0 1-9

5.6.9 Degre s of protection provided by en los re

The test sp cified in IEC 6 5 9:2 13 s al b car ied out for in truments an /or ac es ories

ac ordin to the IP code of the degre s of protection provided by en los res Af er the test,

an in res of water, d st an sol d o jects etc s al b only in a q antity not imp irin the

o eration of the meter an its dielectric stren th

5.6.10 Terminals

5.6.10.1 Terminals, fixed s rews an ste d brace etc of in trument an ac es ory s al

u e the con tru tion an man er of fixin the con u tors to the terminals to en ure adeq ate

an d ra le contact s c that there is no risk of lo senin or u d e he tin

5.6.10.2 The diameter of con u tive s rew an the diameter of contact s rface (or an are

of contact s rface) s al not b les than the relevant value sp cified in Ta le 4 for the rated

The fol owin information s al b given by the man facturer:

a) Unit s) of me s red q antity(ies)

b) Man facturer's name or trade mark or that of the resp n ible s p l er

c) Typ referen e, if an , given by the man facturer

d) Serial n mb r for in truments an ac es ories of clas in ices 0,3 an smal er Serial

n mb r or date of man facture (at le st the ye r) for in truments an ac es ories of clas

in ices 0,5 an gre ter

e) Rated value(s)

f Nature of me s red q antity(ies) an n mb r of me s rin elements

g) Ac urac clas (es)

h) Referen e value or referen e ran e for temp rature for in truments an ac es ories of

clas in ices 0,3 an smal er

i) Referen e value(s) or referen e ran e(s) for e c influen e q antity (other than

temp rature) given in Ta le 2 if dif erent from the values given in Ta le 2 an the

referen e values or referen e ran es for an other relevant influen e q antities not given

in Ta le 2

j) Nominal ran es of u e for the influen e q antities of Ta le 3 if the values are dif erent

Nominal ran es of u e for an other relevant influen e q antities not given in Ta le 3

k) Value of ac eleration

l) In tru tion for the u e of the in trument an /or ac es ory(ies) when neces ary

m) Method of o eration of the in trument

n) The burden expres ed in voltamp res at nominal c r ent an /or nominal voltage

p) Where relevant, referen e p sition an nominal ran e of u e for p sition

q) Temp rature lmits an other req irements for tran p rt, storage an u e, if neces ary

r) For an in trument whose s ale marks do not cor esp n directly to its electrical input

q antity, the relation hip b twe n them This do s not a ply to an in trument havin a

non-interc an e ble ac es ory

s) Precon itionin p riod if not neglgible an the value(s) of the me s red q antity(ies) to

b u ed for precon itionin

t Symb l of the ac es ory for whic the in trument has b en adju ted, if relevant

u) Tran formation ratio(s) of in trument tran former(s) for whic the in trument has b en

adju ted, if relevant

v) Value of the total resistan e of cal brated in trument le d , if relevant

w) Imp dan e of the external me s rin circ it, if relevant

x) Statement con ernin an intentionaly lon resp n e time, if relevant

y) The nature of the au i ary s p ly, rated voltage an rated freq en y of the au i ary

s p ly, if relevant

z) The overvoltage category sp cified ac ordin to IEC 61010-1:2 10: I I I or IV for main

circ its; an the me s rement category sp cified ac ordin to IEC 61010-2-0 0:2 10:

6.2.1 The s mbols sp cified in Ta le 6 s al b u ed, where relevant The markin s an

s mb ls s al b an remain legible an in el ble SI u its, together with their prefixes, s al

b mark d u in the s mb ls given in 6.4 Markin on the dial s al not imp de the cle r

• c ) (group A an group C s ould b mark d, group B s ould not b mark d);

• d ) (s mb l F-31 if some other es ential information is given in a se arate doc ment

6.2.3 The fol owin information in 6.1 s al b mark d on the dial or an where on the case:

• b); c); d); h);

• m) (s mb l(s) F-1 F-21, F-2 , F-2 , F-2 , if relevant ;

• t (s mb l F-2 F-2 );

• u);

• where relevant, the nature an thicknes of the p nel or s p ort (s mb l F-3 F-3 )

• In ad ition, if the referen e values of the influen e q antities are diferent from those

given in Ta le 2, they s al b mark d as fol ows:

– mag etic field of external origin (s mb l F-2 an if relevant F-2 an /or F-2 ),

– electric field of external origin (s mb l F-3 an if relevant F-2 )

6.2.4 The folowin information in 6.1 s al b mark d on the dial or an where on the case

or given in a se arate doc ment (if an ):

• b); c); e); i); j); k); l);n); q); r); s); v); w); a ); b ); c )

• o) (only for in truments containin electronic devices in their me s rin circ its);

• x) (by agre ment b twe n the man facturer an the u er)

6.2.5 Markin s for ac es ories an sp cial markin s for in truments, together with their

location , are given in the relevant p rts

6.2.6 By agre ment b twe n the manufacturer an the u er, an or al of the information

may b omited

6.3 Markings relating to the reference values and nominal ranges of u e of influence

quantities

6.3.1 Where a referen e value or a referen e ran e is dif erent from that given in Ta le 2 it

s al b mark d an s al b distin uis ed by b in u derl ned It is identified by the s mb l

of the u it in whic it is me s red

6.3.2 When a nominal ran e of u e is diferent from that given in Ta le 3 it s al b mark d

The markin is car ied out in conju ction with markin the referen e value or referen e ran e

This then req ires the markin of the referen e value or referen e ran e even if it would not

otherwise b neces ary

6.3.3 The markin is done by writin the l mits of the nominal ran e of u e an the

referen e value (or ran e) in as en in order, e c n mb r se arated from its neig b ur by

thre dots

EX MPLE 1 3 Hz 5 Hz 6 Hz imples a refere c fre u n y of 5 Hz a d a n min l ra g of use for

fre u n y from 3 Hz to 6 Hz

EX MPLE 2 3 Hz 4 Hz 5 Hz 6 Hz imples a refere c fre u n y ra g from 4 Hz to 5 Hz a d a

n min lra g of use for fre u n y from 3 Hz to 6 Hz

6.3.4 When an l mit of the nominal ran e of u e is the same as the referen e value or the

adjacent l mit of the referen e ran e, the n mb r in icatin the referen e value or the l mit of

the referen e ran e s al b re e ted for the l mit of the nominal ran e of u e

EX MPLE 1 2 °C 2 °C 3 °C imples a refere c temp rature of 2 °C a d a n min l ra g of use for

temp rature from 2 °C to 3 °C

EX MPLE 2 2 ° C 2 °C 2 °C 3 °C imples a refere c temp rature ra g from 2 °C to 2 °C a d a

n min lra g of use for temp rature from 2 °C to 3 ° C

6.4 The s mbols for markin instruments and ac es ories

The s mb ls for u its of me s rement an their prefixes are given in Ta le 5

The s mb l of a prefix (if ne ded) immediately precedes, without a sp ce, the s mb l of a

u it If there is a n mb r, it is fol owed by a sp ce b fore the prefix (if an ) an the u it

d (lower c se)

v ltamp re re ctiv v r (lower c se) c nti

a

10–

Th se items are n n-prefer e a d th ir use sh uld b a oid d

The s mb ls for markin in truments an ac es ories are given in Ta le 6

B-5 On me surin eleme t (E) for thre -wire n twork 3 ~ 1E

B-6 On me surin eleme t (E) for fo r-wire n twork 3N ~ 1E

B-7 Two me surin eleme ts (E) for thre -wire n twork with