IEC 60477-2:2022

Laboratory resistors - Part 2: Laboratory AC resistors

IEC 60477-2:2022 applies to resistors intended as laboratory AC resistors for use over a range of frequencies from DC up to a stated frequency which is not in excess of 1 MHz. Such resistors are hereinafter referred to as "AC resistors".
In addition to satisfying the requirements of IEC 60477-1, resistors satisfying the requirements of this document are designed to have a small variation of resistance and a small phase displacement over the stated frequency range.
IEC 60477-2:2022 cancels and replaces the first edition published in 1979, and Amendment 1:1997. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
a) extended the AC resistor frequency range to 1 MHz;
b) updated the terms and definitions according to IEC 60050 series;
c) added the definition of AC/DC difference of an AC resistor;
d) added the resistor classification according to the AC resistance or AC/DC difference index;
e) updated the classification according to the AC resistor construction;
f) updated the safety symbols and requirements according to IEC 60477-1;
g) added the three-element equivalent circuits of an AC resistor in Annex C;
h) added the annex on constructions of AC resistors.

Résistances de laboratoire - Partie 2: Résistances de laboratoire à courant alternatif

L'IEC 60477-2:2022 s’applique aux résistances destinées à être utilisées comme résistances de laboratoire à courant alternatif dans un domaine de fréquences allant du courant continu jusqu’à une fréquence déclarée ne dépassant pas 1 MHz. Ces résistances sont, par la suite, désignées par l’expression "résistances à courant alternatif".
Les résistances qui, non seulement, satisfont aux exigences de l’IEC 60477-1, mais qui satisfont aussi aux exigences du présent document sont conçues de façon à avoir une variation de résistance faible et un déphasage faible dans le domaine de fréquences déclaré.
L'IEC 60477-2:2022 annule et remplace la première édition parue en 1979 et l’Amendement 1:1997. Cette édition constitue une révision technique.
Cette édition inclut les modifications techniques majeures suivantes par rapport à l’édition précédente:
a) extension du domaine de fréquences des résistances à courant alternatif à 1 MHz;
b) mise à jour des termes et définitions conformément à la série IEC 60050;
c) ajout de la définition de la différence entre le courant alternatif et le courant continu pour une résistance à courant alternatif;
d) ajout de la classification des résistances en fonction de la résistance en courant alternatif ou à l’indice de différence entre le courant alternatif et le courant continu;
e) mise à jour de la classification en fonction de la construction des résistances à courant alternatif;
f) mise à jour des symboles de sécurité et des exigences conformément à l’IEC 60477-1;
g) ajout des circuits équivalents à trois éléments d’une résistance à courant alternatif à l’Annexe C;
h) ajout de l’annexe relative aux constructions des résistances à courant alternatif.

General Information

• Status: Published
• Publication Date: 29-Mar-2022
• ICS: 17.220.20 - Measurement of electrical and magnetic quantities
• ICS: 31.040.01 - Resistors in general
• Technical Committee: TC 85 - Measuring equipment for electrical and electromagnetic quantities
• Drafting Committee: MT 25 - TC 85/MT 25
• Current Stage: PPUB - Publication issued
• Start Date: 22-Apr-2022
• Completion Date: 30-Mar-2022

Relations

• Revises: IEC 60477-2:1979/AMD1:1997 - Amendment 1 - Laboratory resistors. Part 2: Laboratory a.c. resistors
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 60477-2 ®
Edition 2.0 2022-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Laboratory resistors –
Part 2: Laboratory AC resistors

Résistances de laboratoire –
Partie 2: Résistances de laboratoire à courant alternatif

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IEC 60477-2 ®
Edition 2.0 2022-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Laboratory resistors –
Part 2: Laboratory AC resistors

Résistances de laboratoire –
Partie 2: Résistances de laboratoire à courant alternatif

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 17.220.20; 31.040.01 ISBN 978-2-8322-1092-7

– 2 – IEC 60477-2:2022 © IEC 2022
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 Resistor characterization and construction. 8
4.1 Resistor characterization . 8
4.2 Resistor construction . 9
5 General requirements . 9
5.1 DC resistance, AC resistance and time constant . 9
5.2 Multiple resistors . 10
5.3 Multi-dial resistors. 10
5.4 Connecting leads . 10
5.5 Conditions for the determination of DC and AC characteristics . 11
6 Permissible variations . 11
7 Further electrical and mechanical requirements . 12
8 Information, markings and symbols . 12
8.1 Information . 12
8.2 Markings and symbols . 12
Annex A (informative) Examples of markings . 14
A.1 Example of marking for a single AC resistor . 14
A.2 Example of marking for a five-dial AC resistor . 14
Annex B (informative) General considerations regarding laboratory AC resistors . 16
Annex C (informative) Equivalent circuits of an AC resistor . 18
C.1 General . 18
C.1.1 Two-element equivalent circuit of an AC resistor . 18
C.1.2 Three-element equivalent circuits . 20
C.2 Guard terminal . 23
Annex D (informative) Construction of AC resistors . 24
D.1 Construction and electrical definition of the impedance . 24
D.2 Two-terminal resistor . 24
D.3 Three-terminal resistor . 24
D.4 Four-terminal resistor . 25
D.5 Five-terminal resistor . 25
D.6 Four-terminal coaxial resistor . 26
D.7 Two-terminal-pair resistor . 26
D.8 Four-terminal-pair resistor . 27

Figure A.1 – Example of marking for a single AC resistor . 14
Figure A.2 – Example of marking for a five-dial resistor . 14
Figure C.1 – The three-element equivalent circuit of an AC resistor (Category A) . 20
Figure C.2 – The three-element equivalent circuit of an AC resistor (Category C) . 22
Figure D.1 – Two-terminal resistor . 24
Figure D.2 – Three-terminal resistor . 25
Figure D.3 – Four-terminal resistor . 25

Figure D.4 – Five-terminal resistor . 26
Figure D.5 – Four-terminal coaxial resistor . 26
Figure D.6 – Two-terminal-pair resistor . 27
Figure D.7 – Four-terminal-pair resistor . 27

Table 1 – Limits of the AC resistance relative uncertainty . 9
Table 2 – Limits of the AC/DC difference . 10
Table 3 – Upper limit of the nominal range of use for frequency . 11

– 4 – IEC 60477-2:2022 © IEC 2022
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
LABORATORY RESISTORS –
Part 2: Laboratory AC resistors

FOREWORD
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