Direct acting indicating analogue electrical measuring instruments and their accessories - Part 6: Special requirements for ohmmeters (impedance meters) and conductance meters

IEC 60051-6:2017 applies to direct acting indicating analogue electrical measuring ohmmeters (impedance meters) and conductance meters.
This document also applies to some non-interchangeable accessories of ohmmeters (impedance meters) and conductance meters.
This fifth edition cancels and replaces the fourth edition published in 1984. 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.

Appareils mesureurs électriques indicateurs analogiques à action directe et leurs accessoires - Partie 6: Exigences particulières pour les ohmmètres (les impédancemètres) et les conductancemètres

L'IEC 60051-6:2017 s'applique aux ohmmètres (impédancemètres) et conductancemètres de mesure électriques indicateurs analogiques à action directe.
La présente partie s'applique également à certains accessoires non interchangeables des ohmmètres (impédancemètres) et conductancemètres,
Cette cinquième édition annule et remplace la quatrième édition parue en 1984. Cette édition constitue une révision technique.
Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
a) mise à jour du contenu en fonction des nouvelles éditions de l'IEC 60051-1 et de l'IEC 60051-9;
b) ajout de l'Annexe A pour spécifier la classification des non-conformités des éléments d'essai.

General Information

Status
Published
Publication Date
14-Dec-2017
Current Stage
PPUB - Publication issued
Completion Date
15-Dec-2017
Ref Project

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IEC 60051-6
Edition 5.0 2017-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Direct acting indicating analogue electrical measuring instruments and their
accessories –
Part 6: Special requirements for ohmmeters (impedance meters) and
conductance meters
Appareils mesureurs électriques indicateurs analogiques à action directe et
leurs accessoires –
Partie 6: Exigences particulières pour les ohmmètres (les impédancemètres) et
les conductancemètres
IEC 60051-6:2017-12(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 60051-6
Edition 5.0 2017-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Direct acting indicating analogue electrical measuring instruments and their
accessories –
Part 6: Special requirements for ohmmeters (impedance meters) and
conductance meters
Appareils mesureurs électriques indicateurs analogiques à action directe et
leurs accessoires –
Partie 6: Exigences particulières pour les ohmmètres (les impédancemètres) et
les conductancemètres
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 17.220.20 ISBN 978-2-8322-5189-8

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – IEC 60051-6:2017 © 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

4.1.1 Description according to methods of operation or nature ................................. 7

4.1.2 Description according to environmental conditions ........................................... 7

4.1.3 Description according to mechanical conditions ............................................... 8

4.1.4 Description according to degrees of protection ................................................ 8

4.1.5 Description according to methods of measurement .......................................... 8

4.1.6 Description according to linearity of scale ........................................................ 8

4.2 Classification .......................................................................................................... 8

4.3 Compliance with the requirements of this standard ................................................. 8

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 ....................................................................... 9

5.3.1 Nominal range of use ....................................................................................... 9

5.3.2 Limits of variations........................................................................................... 9

5.3.3 Conditions for the determination of variations .................................................. 9

5.4 Operating uncertainty, overall system uncertainty and variations ............................ 9

5.5 Electrical requirements ........................................................................................... 9

5.5.1 Electrical safety requirements .......................................................................... 9

5.5.2 Self-heating ..................................................................................................... 9

5.5.3 Permissible overloads ...................................................................................... 9

5.5.4 Limiting range of temperature ........................................................................ 10

5.5.5 Deviation from zero ....................................................................................... 10

5.5.6 Electromagnetic compatibility (EMC) ............................................................. 10

5.6 Constructional requirements ................................................................................. 10

5.6.1 General constructional requirements ............................................................. 10

5.6.2 Damping ........................................................................................................ 10

5.6.3 Sealing to prevent access .............................................................................. 10

5.6.4 Scales ........................................................................................................... 10

5.6.5 Stopper.......................................................................................................... 10

5.6.6 Preferred values ............................................................................................ 10

5.6.7 Adjusters, mechanical and/or electrical .......................................................... 11

5.6.8 Effects of vibration and shock ........................................................................ 11

5.6.9 Degrees of protection provided by enclosure ................................................. 11

5.6.10 Terminals ...................................................................................................... 11

6 Information, markings and symbols ................................................................................ 11

6.1 Information ........................................................................................................... 11

---------------------- Page: 4 ----------------------
IEC 60051-6:2017 © IEC 2017 – 3 –

6.2 Markings, symbols and their locations ................................................................... 11

6.3 Markings relating to the reference values and nominal ranges of use of

influence quantities ............................................................................................... 11

6.4 The symbols for marking instruments and accessories .......................................... 11

6.5 Markings and symbols for terminals ...................................................................... 11

6.5.1 Requirements for markings ............................................................................ 11

6.5.2 Earthing (grounding) terminals ....................................................................... 11

6.5.3 Measuring circuit terminals ............................................................................ 11

6.5.4 Special markings for terminals ....................................................................... 12

6.6 Instructions for use ............................................................................................... 12

7 Package ........................................................................................................................ 12

8 Test rules ...................................................................................................................... 12

Annex A (normative) Nonconformity classification of tests ................................................... 13

Bibliography .......................................................................................................................... 14

Table A.1 – Nonconformity classification of tests .................................................................. 13

---------------------- Page: 5 ----------------------
– 4 – IEC 60051-6:2017 © IEC 2017
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
DIRECT ACTING INDICATING ANALOGUE ELECTRICAL MEASURING
INSTRUMENTS AND THEIR ACCESSORIES –
Part 6: Special requirements for ohmmeters (impedance meters)
and conductance meters
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

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with the International Organization for Standardization (ISO) in accordance with conditions determined by

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2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international

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3) IEC Publications have the form of recommendations for international use and are accepted by IEC National

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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.

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expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC

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 60051-6 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 1984. 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.

---------------------- Page: 6 ----------------------
IEC 60051-6:2017 © IEC 2017 – 5 –
The text of this International Standard is based on the following documents:
CDV Report on voting
85/559/CDV 85/582A/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.
---------------------- Page: 7 ----------------------
– 6 – IEC 60051-6:2017 © 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 60051-6 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.

---------------------- Page: 8 ----------------------
IEC 60051-6:2017 © IEC 2017 – 7 –
DIRECT ACTING INDICATING ANALOGUE ELECTRICAL MEASURING
INSTRUMENTS AND THEIR ACCESSORIES –
Part 6: Special requirements for ohmmeters (impedance meters)
and conductance meters
1 Scope

This part of IEC 60051 applies to direct acting indicating analogue electrical measuring

ohmmeters (impedance meters) and conductance meters.
This document also applies to some non-interchangeable accessories of ohmmeters
(impedance meters) and conductance meters.

This document also applies to a direct acting indicating electrical measuring instrument whose

scale marks do not correspond directly to its electrical input quantity, provided that the

relationship between them is known.

This document also applies to electronic devices of ohmmeters (impedance meters) and

conductance meters in their measuring and/or auxiliary circuits.

This document does not apply to insulation ohmmeters, grounding ohmmeters and external

commercial power ohmmeters (impedance meters) and conductance meters.
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 – Part1: 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
4.1.1 Description according to methods of operation or nature
See IEC 60051-1:2016.
4.1.2 Description according to environmental conditions
See IEC 60051-1:2016.
---------------------- Page: 9 ----------------------
– 8 – IEC 60051-6:2017 © IEC 2017
4.1.3 Description according to mechanical conditions
See IEC 60051-1:2016.
4.1.4 Description according to degrees of protection
See IEC 60051-1:2016.
4.1.5 Description according to methods of measurement

Ohmmeters (impedance meters) and conductance meters shall be described according to

whether they measure resistance values by a two-terminal or a four-terminal method.

4.1.6 Description according to linearity of scale

Ohmmeters (impedance meters) and conductance meters shall be described according to

whether they have a linear scale or a non-linear scale.
4.2 Classification

Ohmmeters (impedance meters) and conductance meters shall be classified in one of the

accuracy classes denoted by the following class indices:
0,05, 0,1, 0,2, 0,5, 1, 1,5, 2, 2,5, 3, 5, 10, 20.
4.3 Compliance with the requirements of this standard
4.3.1 See IEC 60051-1:2016.
4.3.2 See IEC 60051-1:2016.
4.3.3 See IEC 60051-1:2016.

4.3.4 For impedance meters and for instruments not scaled in units of resistance or

conductance, the manufacturer's instructions shall be followed.
5 Requirements
5.1 Reference conditions
See IEC 60051-1:2016.
5.2 Limits of intrinsic uncertainty, fiducial value
5.2.1 Limits of intrinsic uncertainty
See IEC 60051-1:2016.
5.2.2 Correspondence between intrinsic uncertainty and accuracy class
See IEC 60051-1:2016.
5.2.3 Fiducial value

5.2.3.1 The fiducial value for non-linear scale ohmmeters and impedance meters is the

indicated value.

The class index is marked using symbol E-3 given in Table 6 of IEC60051-1:2016 (see

Clause 6 of IEC 60051-1:2016).
---------------------- Page: 10 ----------------------
IEC 60051-6:2017 © IEC 2017 – 9 –

5.2.3.2 The fiducial value for linear scale ohmmeters is the upper limit of the measuring

range.

The class index is marked using symbol E-4 given in Table 6 of IEC60051-1:2016 (see

Clause 6 of IEC 60051-1:2016).
5.3 Nominal range of use and variations
5.3.1 Nominal range of use
5.3.1.1 See IEC 60051-1:2016.

5.3.1.2 The requirements in Table 2 of IEC 60051-1:2016 concerning ripple, distortion,

peak-factor and frequency do not apply to ohmmeters, conductance meters and impedance

meters.
5.3.2 Limits of variations
See IEC 60051-1:2016.

The requirements in Table 2 of IEC60051-1:2016 concerning ripple, distortion, peak-factor

and frequency do not apply to ohmmeters, conductance meters and impedance meters.

Ohmmeters, conductance meters and impedance meters, which employ a battery as a power

source, shall operate correctly when the batteries' voltage and internal resistance are within

the range stated by the manufacturer. When the preliminary adjustments specified by the

manufacturer have been carried out, any variations caused by changes of the battery

characteristics shall not cause the instrument to indicate outside its accuracy class.

5.3.3 Conditions for the determination of variations
5.3.3.1 See IEC 60051-1:2016.
5.3.3.2 See IEC 60051-1:2016.
5.3.3.3 See IEC 60051-1:2016.

5.3.3.4 The variations of ohmmeters, impedance meters and conductance meters intended

for intermittent use shall be determined immediately after pre-conditioning, if any.

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
The requirements of self-heating do not apply to ohmmeters, impedance meters and
conductance meters.
5.5.3 Permissible overloads

The requirements of permissible overloads do not apply to ohmmeters, impedance meters and

conductance meters.
---------------------- Page: 11 ----------------------
– 10 – IEC 60051-6:2017 © IEC 2017
5.5.4 Limiting range of temperature
See IEC 60051-1:2016.
5.5.5 Deviation from zero

The requirements of deviation from zero do not apply to ohmmeters, impedance meters and

conductance meters.
5.5.6 Electromagnetic compatibility (EMC)
See IEC 60051-1:2016.
5.6 Constructional requirements
5.6.1 General constructional requirements
See IEC 60051-1:2016.
5.6.2 Damping
See IEC 60051-1:2016.
5.6.3 Sealing to prevent access
See IEC 60051-1:2016.
5.6.4 Scales
5.6.4.1 Scale divisions
See IEC 60051-1:2016.
5.6.4.2 Scale numbering
See IEC 60051-1:2016.
5.6.4.3 Direction of deflection

The requirements of the direction of deflection do not apply to the ohmmeters, impedance

meters and conductance meters.
5.6.4.4 Limits of the measuring range
a) See IEC 60051-1:2016.

b) For ohmmeters with non-linear scales, the method of identifying the limits of the

measuring range by the omission of subdivisions outside the measuring range shall not be

used.
c) The measuring range shall correspond to at least 50 % of the scale length.
5.6.5 Stopper

The requirements of stopper do not apply to ohmmeters, impedance meters and conductance

meters.
5.6.6 Preferred values
The preferred values shall be agreed between the manufacturer and the user.
---------------------- Page: 12 ----------------------
IEC 60051-6:2017 © IEC 2017 – 11 –
5.6.7 Adjusters, mechanical and/or electrical
See IEC 60051-1:2016.
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.
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

The requirements of earthing (grounding) terminals do not apply to ohmmeters, impedance

meters and conductance meters.
6.5.3 Measuring circuit terminals
See IEC 60051-1:2016.
---------------------- Page: 13 ----------------------
– 12 – IEC 60051-6:2017 © IEC 2017
6.5.4 Special markings for terminals

6.5.4.1 Single-function two-terminal ohmmeters shall have the terminal which, when in use,

is positive relative to the other terminal, marked with symbol F-39 (+).

6.5.4.2 Single-function four-terminal ohmmeters shall have the current terminal which,

when in use, is positive relative to the other terminal, marked with symbol F-39 (+).

6.5.4.3 The terminal(s) of the ohmmeters, impedance meters and conductance meters

which is(are) intended to be connected to (a) terminal(s) on the accessory(ies) shall be

marked with (an) Arabic numeral(s).

6.5.4.4 The manufacturer may select any convenient and non-conflicting numeral(s). Pairs

of terminals which are intended to be connected together shall carry the same numeral.

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.
---------------------- Page: 14 ----------------------
IEC 60051-6:2017 © IEC 2017 – 13 –
Annex A
(nor
...

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