EN IEC 60051-4:2021

SLOVENSKI STANDARD
01-september-2021
Nadomešča:
SIST EN 60051-4:1995
Neposredni kazalni analogni električni merilni instrumenti in njihov pribor - 4. del:
Posebne zahteve za merilnike frekvence (IEC 60051-4:2018)
Direct acting indicating analogue electrical measuring instruments and their accessories
title - Part 4: Special requirements for frequency meters (IEC 60051-4:2018)
Direkt wirkend anzeigende analoge elektrische Messgeräte und ihr Zubehör - Teil 4:
Spezielle Anforderungen für Frequenz-Messgeräte (IEC 60051-4:2018)
Appareils mesureurs électriques indicateurs analogiques à action directe et leurs
accessoires - Partie 4: Exigences particulières pour les fréquencemètres (IEC 60051-
4:2018
Ta slovenski standard je istoveten z: EN IEC 60051-4:2021
ICS:
17.220.20 Merjenje električnih in Measurement of electrical
magnetnih veličin and magnetic quantities
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN IEC 60051-4

NORME EUROPÉENNE
EUROPÄISCHE NORM
April 2021
ICS 17.220.20 Supersedes EN 60051-4:1989 and all of its amendments
and corrigenda (if any)
English Version
Direct acting indicating analogue electrical measuring
instruments and their accessories title - Part 4: Special
requirements for frequency meters
(IEC 60051-4:2018)
Appareils mesureurs électriques indicateurs analogiques à Direkt wirkend anzeigende analoge elektrische Messgeräte
action directe et leurs accessoires - Partie 4: Exigences und ihr Zubehör - Teil 4: Spezielle Anforderungen für
particulières pour les fréquencemètres Frequenz-Messgeräte
(IEC 60051-4:2018) (IEC 60051-4:2018)
This European Standard was approved by CENELEC on 2018-10-04. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2021 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 60051-4:2021 E

European foreword
The text of document 85/557/CDV, future edition 5 of IEC 60051-4, prepared by IEC/TC 85
"Measuring equipment for electrical and electromagnetic quantities" was submitted to the IEC-
CENELEC parallel vote and approved by CENELEC as EN IEC 60051-4:2021.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2021-10-30
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2024-04-30
document have to be withdrawn
This document supersedes EN 60051-4:1989 and all of its amendments and corrigenda (if any).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
This document has been prepared under a mandate given to CENELEC by the European Commission
and the European Free Trade Association.
Endorsement notice
The text of the International Standard IEC 60051-4:2018 was approved by CENELEC as a European
Standard without any modification.

Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
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.
NOTE 1 Where an International Publication has been modified by common modifications, indicated by (mod), the
relevant EN/HD applies.
NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available
here: www.cenelec.eu.
Publication Year Title EN/HD Year
IEC 60051-1 2016 Direct acting indicating analogue electrical EN 60051-1 2017
measuring instruments and their
accessories – Part 1: Definitions and
general requirements common to all parts
IEC 60051-9 - Direct acting indicating analogue electrical EN 60051-9 -
measuring instruments and their
accessories - Part 9: Recommended test
methods
IEC 60051-4 ®
Edition 5.0 2018-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Direct acting indicating analogue electrical measuring instruments and their

accessories title –
Part 4: Special requirements for frequency meters

Appareils mesureurs électriques indicateurs analogiques à action directe et

leurs accessoires –
Partie 4: Exigences particulières pour les fréquencemètres

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 17.220.20 ISBN 978-2-8322-5958-0

– 2 – IEC 60051-4:2018 © IEC 2018
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 7
4 Description, classification and compliance . 7
5 Requirements . 7
5.1 Reference conditions . 7
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 . 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) . 11
5.6 Constructional requirements . 11
5.6.1 General constructional requirements . 11
5.6.2 Damping . 11
5.6.3 Sealing to prevent access . 11
5.6.4 Scales . 11
5.6.5 Stopper. 11
5.6.6 Preferred values . 11
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
6.2 Markings, symbols and their locations . 12
6.3 Markings relating to the reference values and nominal ranges of use of
influence quantities . 12
6.4 The symbols for marking instruments and accessories . 12
6.5 Markings and symbols for terminals . 12
6.5.1 Requirements for markings . 12
6.5.2 Earthing (grounding) terminals . 12
6.5.3 Measuring circuit terminals . 12
6.5.4 Special markings for terminals . 12

IEC 60051-4:2018 © IEC 2018 – 3 –
6.6 Instructions for use . 12
7 Package . 12
8 Test rules . 12
Annex A (normative) Nonconformity classification of tests . 13

Table 1 – Reference conditions and tolerances, in addition 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 for frequency meters . 10
Table A.1 – Nonconformity classification of tests . 13

– 4 – IEC 60051-4:2018 © IEC 2018
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
DIRECT ACTING INDICATING ANALOGUE ELECTRICAL
MEASURING INSTRUMENTS AND THEIR ACCESSORIES TITLE –

Part 4: Special requirements for frequency 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
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmen
...