IEC 60051-5:2017

IEC 60051-5 ®
Edition 5.0 2017-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Direct acting indicating analogue electrical measuring instruments and their
accessories –
Part 5: Special requirements for phase meters, power factor meters and
synchroscopes
Appareils mesureurs électriques indicateurs analogiques à action directe et
leurs accessoires –
Partie 5: Exigences particulières pour les phasemètres, les appareils de mesure
de facteur de puissance et les synchronoscopes

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IEC 60051-5 ®
Edition 5.0 2017-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Direct acting indicating analogue electrical measuring instruments and their

accessories –
Part 5: Special requirements for phase meters, power factor meters and

synchroscopes
Appareils mesureurs électriques indicateurs analogiques à action directe et

leurs accessoires –
Partie 5: Exigences particulières pour les phasemètres, les appareils de mesure

de facteur de puissance et les synchronoscopes

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 17.220.20 ISBN 978-2-8322-5187-4

– 2 – IEC 60051-5:2017 © IEC 2017
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 7
4 Description, classification and compliance . 7
4.1 Description . 7
4.2 Classification . 7
4.3 Compliance with the requirements of this standard . 7
5 Requirements . 8
5.1 Reference conditions . 8
5.2 Limits of intrinsic uncertainty, fiducial value . 8
5.2.1 Limits of intrinsic uncertainty . 8
5.2.2 Correspondence between intrinsic uncertainty and accuracy class . 8
5.2.3 Fiducial value . 8
5.3 Nominal range of use and variations . 8
5.3.1 Nominal range of use . 8
5.3.2 Limits of variations. 9
5.3.3 Conditions for the determination of variations . 10
5.4 Operating uncertainty, overall system uncertainty and variations . 10
5.5 Electrical requirements . 10
5.5.1 Electrical safety requirements . 10
5.5.2 Self-heating . 10
5.5.3 Permissible overloads . 10
5.5.4 Limiting range of temperature . 11
5.5.5 Deviation from zero . 11
5.5.6 Electromagnetic compatibility (EMC) . 11
5.5.7 Special requirements for synchroscopes . 12
5.6 Constructional requirements . 12
5.6.1 General constructional requirements . 12
5.6.2 Damping . 12
5.6.3 Sealing to prevent access . 12
5.6.4 Scales . 12
5.6.5 Stopper. 12
5.6.6 Preferred values . 12
5.6.7 Adjusters, mechanical and/or electrical . 13
5.6.8 Effects of vibration and shock . 13
5.6.9 Degrees of protection provided by enclosure . 13
5.6.10 Terminals . 13
6 Information, markings and symbols . 13
6.1 Information . 13
6.2 Markings, symbols and their locations . 13
6.3 Markings relating to the reference values and nominal ranges of use of
influence quantities . 13
6.4 The symbols for marking instruments and accessories . 13
6.5 Markings and symbols for terminals . 13

6.5.1 Requirements for markings . 13
6.5.2 Earthing (grounding) terminals . 13
6.5.3 Measuring circuit terminals . 14
6.5.4 Special markings for terminals . 14
6.6 Instructions for use . 14
7 Package . 14
8 Test rules . 14
Annex A (normative) Nonconformity classification of tests . 15
Bibliography . 16

Table 1 – Reference conditions and tolerances, additional to those given in Table 2 of
IEC 60051-1:2016, for testing purposes relating to the influence quantities . 8
Table 2 – Limits of the nominal range of use and permissible variations in addition to
those given in Table 3 of IEC 60051-1:2016 . 9
Table 3 – Overloads of short duration . 11
Table A.1 – Nonconformity classification of tests . 15

– 4 – IEC 60051-5:2017 © IEC 2017
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
DIRECT ACTING INDICATING ANALOGUE ELECTRICAL
MEASURING INSTRUMENTS AND THEIR ACCESSORIES –

Part 5: Special requirements for phase meters,
power factor meters and synchroscopes

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
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Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
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agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
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5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
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services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
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Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 60051-5 has been prepared by IEC technical committee 85:
Measuring equipment for electrical and electromagnetic quantities.
This fifth edition cancels and replaces the fourth edition published in 1985. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) updating of content in line with new editions of IEC 60051-1 and IEC 60051-9;
b) addition of Annex A to specify the nonconformity classification of test items.

The text of this International Standard is based on the following documents:
CDV Report on voting
85/581/CDV 85/581A/RVC
Full information on the voting for the approval of this International Standard can be found in
the report on voting indicated in the above table.
This International Standard is to be used in conjunction with IEC 60051-1:2016.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts in the IEC 60051 series, published under the general title Direct acting
indicating analogue electrical measuring instruments and their accessories, can be found on
the IEC website.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
– 6 – IEC 60051-5:2017 © IEC 2017
INTRODUCTION
IEC 60051 is published in separate parts according to the following structure and under the
general title: Direct acting indicating analogue electrical measuring instruments and their
accessories.
Part 1: Definitions and general requirements common to all parts
Part 2: Special requirements for ammeters and voltmeters
Part 3: Special requirements for wattmeters and varmeters
Part 4: Special requirements for frequency meters
Part 5: Special requirements for phase meters, power factor meters and synchroscopes
Part 6: Special requirements for ohmmeters (impedance meters) and conductance meters
Part 7: Special requirements for multi-function instruments
Part 8: Special requirements for accessories
Part 9: Recommended test methods
IEC 60051-5 is not complete in itself and is read in conjunction with IEC 60051-1.
All of these parts are arranged in the same format and a standard relationship between
subject and clause number is maintained throughout these parts. This arrangement will assist
the reader of IEC 60051 to distinguish information relating to the different types of instruments.

DIRECT ACTING INDICATING ANALOGUE ELECTRICAL
MEASURING INSTRUMENTS AND THEIR ACCESSORIES –

Part 5: Special requirements for phase meters,
power factor meters and synchroscopes

1 Scope
This part of IEC 60051 applies to direct acting indicating phase meters, power factor meters
and synchroscopes having an analogue display.
This document also applies to non-interchangeable accessories (as defined in 3.1.23 of
IEC 60051-1:2016) used with phase meters, power factor meters and synchroscopes.
This document also applies to a phase meter or power factor meter whose scale marks do not
correspond directly to its electrical input quantity, provided that the relationship between them
is known.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their
content constitutes requirements of this document. For dated references, only the edition
cited applies. For undated references, the latest edition of the referenced document (including
any amendments) applies.
IEC 60051-1:2016, Direct acting indicating analogue electrical measuring instruments and
their accessories – Part 1: Definitions and general requirements common to all parts
3 Terms and definitions
See IEC 60051-1:2016.
4 Description, classification and compliance
4.1 Description
See IEC 60051-1:2016.
4.2 Classification
Phase meters, power factor meters and synchroscopes shall be classified in one of the
accuracy classes denoted by the following class indices:
0,1, 0,2, 0,3, 0,5, 1, 1,5, 2, 2,5, 3, 5

4.3 Compliance with the requirements of this standard
See IEC 60051-1:2016.
– 8 – IEC 60051-5:2017 © IEC 2017
5 Requirements
5.1 Reference conditions
See IEC 60051-1:2016. The reference value of the influence quantities should be as given in
Table 2 of IEC 60051-1:2016 and Table 1.
Table 1 – Reference conditions and tolerances, additional to those given in Table 2
of IEC 60051-1:2016, for testing purposes relating to the influence quantities
Influence quantity Reference conditions unless otherwise marked Tolerance permitted for
testing purposes,
applicable for a single
a
reference value
Voltage component of the Rated voltage or any voltage within the reference range ±2 % of the rated value
measured quantity
Current component of the 40 % . 100 % of rated current –
measured quantity
Frequency of voltage and Instruments using phase Reference frequency ±0,1 % of the reference
current components of the shifting devices frequency
measured quantity
Other instruments 45 Hz to 65 Hz ±2 % of the reference
frequency
b
Phase balance (for Symmetrical voltages and currents
polyphase instruments)
a
This tolerance applies when a single reference value is specified in this table or is marked by the
manufacturer. For a reference range, no tolerance is allowed.
b
Each of the voltages (between any two lines or between line and neutral) should not differ by more than 1 %
from the average of the voltages (line-to-line or line-to-neutral) of the system.
Each of the currents in the phases should not differ by more than 1 % from the average of the currents.
The angles between each of the currents and the corresponding phase-to-neutral voltages should not differ by
more than 2° from the average of the angles.

5.2 Limits of intrinsic uncertainty, fiducial value
5.2.1 Limits of intrinsic uncertainty
See IEC 60051-1:2016.
For a synchroscope, the accuracy requirements apply only at the synchronizing mark.
5.2.2 Correspondence between intrinsic uncertainty and accuracy class
See IEC 60051-1:2016.
5.2.3 Fiducial value
The fiducial value corresponds to a phase angle of 90°.
The class index is marked using symbol E-1 given in Table 6 of IEC 60051-1:2016 (see
Clause 6 of IEC 60051-1:2016).
5.3 Nominal range of use and variations
5.3.1 Nominal range of use
See IEC 60051-1:2016. The limits of the nominal range of use for influence quantities shall be
as given in Table 3 of IEC 60051-1:2016 and Table 2.

Table 2 – Limits of the nominal range of use and permissible variations
in addition to those given in Table 3 of IEC 60051-1:2016
Influence quantity Limits of the nominal range of Permissible variation expressed
use unless otherwise marked
Distortion of Distortion factor 5 % 100 %
voltage and/or
a b
Peak factor 1 to 3 Under consideration
current
components of the
measured quantity
Frequency of Instruments using Reference frequency ±1 % or lower 100 %
voltage and phase shifting limit of reference range -1 % and
current devices upper limit of reference range +1 %
components of the
Other instruments Reference frequency ±10 % or
measured quantity
lower limit of reference range -10 %
and upper limit of reference range
+10 %
Voltage components of the measured Reference voltage ±15 % or lower 100 %
quantity limit of reference range -15 % and
upper limit of reference range
+15 %
20 %.120 % of rated current 100 %
Current components of the measured
quantity
Phase balance (for polyphase Disconnection of one current 200 %
instruments) component of the measured quantity
Magnetic field of external origin 0,4 kA/m Class Class
indices indices
0,3 and 0,5 and
smaller greater
Electro- 3 % of the 6 % of the
dynamic fiducial fiducial
c c
instruments values values
if not static
and/or not
having a
magnetic
screen
Ferro- 1,5 % of the 3 % of the
dynamic fiducial fiducial
c c
instruments values values
if not static
and/or not
having a
magnetic
screen
All other 0,75 % of 1,5 % of the
instruments the fiducial fiducial
c c
values values
a
For instruments having electronic devices in their measuring circuits.
b
The permissible variation due to a peak factor of other than (corresponding to a sine wave) is included in
the permissible variation due to distortion of the measured quantity.
For instruments having a peak factor capability greater than 3, the manufacturer shall state:
1)
The peak factor producing a variation of 100 % of the class index.
2)
The upper and lower limits of the frequency response (bandwidth) to 0,707 times the indication at the
reference frequency.
3)
The effective maximum rate of change of internal instrument AC amplifier response (slew rate), expressed
in volts per second, using appropriate SI prefixes.
c
Not as a percentage of the class index.

5.3.2 Limits of variations
See IEC 60051-1:2016 and Table 2.

– 10 – IEC 60051-5:2017 © IEC 2017
5.3.3 Conditions for the determination of variations
See IEC 60051-1:2016.
5.4 Operating uncertainty, overall system uncertainty and variations
See IEC 60051-1:2016.
5.5 Electrical requirements
5.5.1 Electrical safety requirements
See IEC 60051-1:2016.
5.5.2 Self-heating
See IEC 60051-1:2016.
However, the requirements of IEC 60051-1:2016 do not apply to synchroscopes.
5.5.3 Permissible overloads
5.5.3.1 Continuous overload
For the recommended test, see IEC 60051-9.
All phase meters and power factor meters, together with their non-interchangeable
accessory(ies), if any, except for instruments fitted with a non-locking switch, shall be
subjected to a continuous overload of 120 % of the rated value for all current circuits
simultaneously for a period of 2 h.
After having cooled to the reference temperature, the instrument, together with its non-inter-
changeable accessory(ies), if any, shall comply with its accuracy requirements but without
repeating the overload.
The continuous overload test shall be carried out under reference conditions except for
current.
The requirements for continuous overload do not apply to synchroscopes.
5.5.3.2 Overloads of short duration
5.5.3.2.1 For the recommended test, see IEC 60051-9.
All phase meters, power factor meters and synchroscopes, together with their non-
interchangeable accessory(ies), if any, shall be subjected to overloads of short duration.
However, these requirements do not apply to instruments whose scale marks do not
correspond directly to their electrical input quantities (but not excluding instruments intended
to be used with (an) instrument transformer(s)).
5.5.3.2.2 The values of current and voltage for the overloads of short duration shall be the
product of the relevant factor given in Table 3 and the rated value of voltage or the upper limit
of the nominal range of use for current unless other values are stated by the manufacturer.
The overloads shall be applied separately to each input circuit.

Table 3 – Overloads of short duration
Measuring circuit Overload factor Number of Duration of each Interval between
overloads overload successive
overloads
(s) (s)
Class indices 0,5 and smaller
Current circuit 2
5 1 15
Voltage circuit 2
Class indices 1 and greater
Current circuit 10
9 0,5 60
Voltage circuit 2
Current circuit 10
1 5 –
Voltage circuit 2
Where two series of tests are specified, they should both be carried out, in the order given.

5.5.3.2.3 The full duration of each overload shall be applied except when an automatic cut-
out (fuse) fitted to the instrument has interrupted the circuit in less than the time specified in
Table 3.
The automatic cut-out shall be reset (or the fuse replaced) before the application of the next
overload.
5.5.3.2.4 After having been subjected to the overloads of short duration and after having
cooled to the reference temperature, phase meters, power factor meters and synchroscopes,
together with their non-interchangeable accessory(ies), if any, shall comply with their
accuracy requirements; however, the overloads shall not be repeated.
5.5.4 Limiting range of temperature
See IEC 60051-1:2016.
5.5.5 Deviation from zero
5.5.5.1 General
For the recommended test, see IEC 60051-9.
If a phase meter or a power factor meter has a setting mark (zero position mark) on the scale,
it shall be tested for return to that mark when de-energized.
The test shall be carried out under reference conditions.
5.5.5.2 All circuits energized
After a period of energization of 30 s at the upper limit of the measuring range, the deviation
of the index from the setting mark (zero position mark), expressed as a percentage of the
scale length, shall not exceed a value corresponding to 50 % of the class index.
This requirement does not apply to synchroscopes.
5.5.6 Electromagnetic compatibility (EMC)
See IEC 60051-1:2016
– 12 – IEC 60051-5:2017 © IEC 2017
5.5.7 Special requirements for synchroscopes
5.5.7.1 Separate circuits
Synchroscopes shall have two separate input circuits, with no conductive connection between
them.
5.5.7.2 Index rotation
For polyphase synchroscopes, the index shall be rotating in the correct direction when the
difference between the frequencies applied to the two input circuits has been reduced to
1,5 Hz, one of the frequencies being the reference frequency or any frequency within the
reference range for frequency (if any).
For single-phase synchroscopes, use 1 Hz instead of 1,5 Hz.
5.5.7.3 Rotation rate
For polyphase synchroscopes, for any constant frequency difference not exceeding 1,5 Hz,
the rate of rotation of the index shall be substantially uniform as judged visually.
For single-phase synchroscopes, use 1 Hz instead of 1,5 Hz.
5.5.7.4 Index indication
Under reference conditions, but with one or both circuits disconnected, the index shall not
indicate, at any time, an angle ≤ 30° on either side of the synchronizing mark. This
requirement also applies if the disconnected circuit(s) remain(s) connected to the secondary
of the instrument transformer(s) with which it(they) is(are) normally associated, the
disconnection being achieved on the primary of the transformer(s).
5.6 Constructional requirements
5.6.1 General constructional requirements
See IEC 60051-1:2016.
5.6.2 Damping
The requirements of IEC 60051-1:2016 do not apply to phase meters, power factor meters
and synchroscopes.
5.6.3 Sealing to prevent access
See IEC 60051-1:2016.
5.6.4 Scales
See IEC 60051-1:2016.
5.6.5 Stopper
See IEC 60051-1:2016.
5.6.6 Preferred values
The rated values for phase meters, power factor meters and synchroscopes shall be the
subject of agreement between the manufacturer and the user.

5.6.7 Adjusters, mechanical and/or electrical
See IEC 60051-1:2016.
Phase meters and power factor meters having a mechanical zero position on the scale shall
have a setting mark (zero position mark) at that position.
Phase meters and power factor meters not having a determinate mechanical zero or having a
mechanical zero which is outside the scale shall not be provided with an accessible zero
adjuster.
This requirement does not apply to synchroscopes.
5.6.8 Effects of vibration and shock
See IEC 60051-1:2016.
5.6.9 Degrees of protection provided by enclosure
See IEC 60051-1:2016.
5.6.10 Terminals
See IEC 60051-1:2016.
6 Information, markings and symbols
6.1 Information
See IEC 60051-1:2016.
If an instrument is provided with a phase shifting device, this shall be stated as required by
items m) and z) (see 6.1 of IEC 60051-1:2016).
6.2 Markings, symbols and their locations
See IEC 60051-1:2016.
6.3 Markings relating to the reference values and nominal ranges of use of influence
quantities
See IEC 60051-1:2016.
6.4 The symbols for marking instruments and accessories
See IEC 60051-1:2016.
6.5 Markings and symbols for terminals
6.5.1 Requirements for markings
See IEC 60051-1:2016.
6.5.2 Earthing (grounding) terminals
See IEC 60051-1:2016.
– 14 – IEC 60051-5:2017 © IEC 2017
6.5.3 Measuring circuit terminals
See IEC 60051-1:2016.
6.5.4 Special markings for terminals
All terminals shall be marked to ensure that they can be uniquely identified.
6.6 Instructions for use
See IEC 60051-1:2016.
7 Package
See IEC 60051-1:2016.
8 Test rules
See IEC 60051-1:2016.
The recommended nonconformity classification of tests is given in Annex A.
The method of acceptance inspection may be agreed between the manufacturer and the
customer.
Annex A
(normative)
Nonconformity classification of tests
The recommended nonconformity classification of tests is listed in Table A.1.
Table A.1 – Nonconformity classification of tests
Test Nonconformity class
Limits of intrinsic uncertainty (5.2.1) A
Limits of variations (5.3.2) B
Electrical safety requirements (5.5.1) A
Self-heating (5.5.2) B
Permissible overloads (5.5.3) B
Limiting range of temperature (5.5.4) B
Deviation from zero (5.5.5) B
Electromagnetic compatibility (EMC) (5.5.6) B
Adjusters, mechanical and/or electrical (5.6.7) B
Effects of vibration and shock (5.6.8) B
Degrees of protection provided by enclosure (5.6.9) B
Terminals (5.6.10) B
– 16 – IEC 60051-5:2017 © IEC 2017
Bibliography
IEC 60051-9 , Direct acting indicating analogue electrical measuring instruments and their
accessories – Part 9: Recommended test methods

___________
Under preparation.
– 18 – IEC 60051-5:2017 © IEC 2017
SOMMAIRE
AVANT-PROPOS . 20
INTRODUCTION . 22
1 Domaine d'application . 23
2 Références normatives . 23
3 Termes et définitions . 23
4 Description, classification et conformité . 23
4.1 Description . 23
4.2 Classification . 23
4.3 Conformité aux exigences de la présente norme . 23
5 Exigences . 24
5.1 Conditions de référence . 24
5.2 Limites de l'incertitude intrinsèque, valeur de repère . 24
5.2.1 Limites de l'incertitude intrinsèque . 24
5.2.2 Correspondance entre l'incertitude intrinsèque et la classe d'exactitude . 24
5.2.3 Valeur de repère . 24
5.3 Domaine nominal d'utilisation et variations . 25
5.3.1 Domaine nominal d'utilisation . 25
5.3.2 Limites des variations . 26
5.3.3 Conditions à respecter pour la détermination des variations . 26
5.4 Incertitude de fonctionnement, incertitude globale du système et variations . 26
5.5 Exigences électriques . 26
5.5.1 Exigences de sécurité électrique . 26
5.5.2 Autoéchauffement . 26
5.5.3 Surcharges admissibles . 26
5.5.4 Limites de la plage de températures . 27
5.5.5 Ecart de zéro . 27
5.5.6 Compatibilité électromagnétique (CEM) . 28
5.5.7 Exigences particulières pour les synchronoscopes . 28
5.6 Exigences de construction . 28
5.6.1 Exigences générales de construction . 28
5.6.2 Amortissement . 28
5.6.3 Plombage destiné à interdire l'accès à l'intérieur de l'appareil. 28
5.6.4 Echelles . 29
5.6.5 Butoir . 29
5.6.6 Valeurs préférentielles . 29
5.6.7 Appareils de réglage, mécaniques et/ou électriques . 29
5.6.8 Effets des vibrations et des chocs. 29
5.6.9 Degrés de protection procurés par l'enveloppe . 29
5.6.10 Bornes . 29
6 Informations, marquages et symboles . 29
6.1 Informations . 29
6.2 Marquages, symboles et leurs emplacements . 29
6.3 Marquages relatifs aux valeurs de référence et aux plages nominales
d'utilisation des grandeurs d'influence . 29
6.4 Symboles pour le marquage des appareils et accessoires . 30
6.5 Marquages et symboles pour les bornes . 30

6.5.1 Exigences relatives aux marquages . 30
6.5.2 Bornes de mise à la terre . 30
6.5.3 Bornes du circuit de mesure . 30
6.5.4 Marquages spéciaux pour les bornes . 30
6.6 Instructions d'utilisation. 30
7 Emballage . 30
8 Règles d'essai . 30
Annexe A (normative) Classification des non-conformités identifiées lors des essais . 31
Bibliography . 32

Tableau 1 – Conditions de référence et tolérances qui s'ajoutent à celles du Tableau 2
de l'IEC 60051-1:2016 pour les essais relatifs aux grandeurs d'influence . 24
Tableau 2 – Limites du domaine nominal d'utilisation et variations admissibles qui
s'ajoutent à celles du Tableau 3 de l'IEC 60051-1:2016 . 25
Tableau 3 – Surcharges de courte durée . 27
Tableau A.1 – Classification des non-conformités identifiées lors des essais . 31

– 20 – IEC 60051-5:2017 © IEC 2017
COMMISSION ÉLECTROTECHNIQUE INTERNATIONALE
____________
APPAREILS MESUREURS ÉLECTRIQUES INDICATEURS ANALOGIQUES
À ACTION DIRECTE ET LEURS ACCESSOIRES –

Partie 5: Exigences particulières pour les phasemètres, les appareils
de mesure de facteur de puissance et les synchronoscopes

AVANT-PROPOS
1) La Commission Electrotechnique Internationale (IEC) est une organisation mondiale de normalisation
composée de l'ensemble des comités électrotechniques nationaux (Comités nationaux de l’IEC). L’IEC a pour
objet de favoriser la coopération internationale pour toutes les questions de normalisation dans les domaines
de l'électricité et de l'électronique. A cet effet, l’IEC – entre autres activités – publie des Normes internationales,
des Spécifications techniques, des Rapports techniques, des Spécifications accessibles au public (PAS) et des
Guides (ci-après dénommés "Publication(s) de l’IEC"). Leur élaboration est confiée à des comités d'études, aux
travaux desquels tout Comité national intéressé par le sujet traité peut participer. Les organisations
internationales, gouvernementales e
...