Method of measurement of current noise generated in fixed resistors

IEC 60195:2016 specifies a method of measurement and associated test conditions to assess the "noisiness", or magnitude of current noise, generated in fixed resistors of any given type. The method applies to all classes of fixed resistors. The aim is to provide comparable results for the determination of the suitability of resistors for use in electronic circuits having critical noise requirements. This edition includes the following significant technical changes with respect to the previous edition:
- harmonization of the allocation of isolation resistors RM in the recommended operating conditions given in Table 2;
- correction of erroneous numeric values of the contribution of system noise, f(T - S) in Table 3;
- addition of advice on the prescription of requirements in a relevant component specification;
- addition of a set of recommended measuring conditions for specimens with a rated dissipation of less than 100 mW;
- complete editorial revision.

Méthode pour la mesure du bruit produit en charge par les résistances fixes

L'IEC 60195:2016 spécifie une méthode de mesure et des conditions d'essai associées pour évaluer l'absence de bruit ou l'amplitude du bruit en charge généré dans des résistances fixes d'un type quelconque. La méthode s'applique à toutes les classes de résistances fixes. Elle a pour but de fournir des résultats comparables pour déterminer l'aptitude des résistances utilisées dans des circuits électroniques dont les exigences relatives au bruit sont critiques. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
- harmonisation de l'affectation des résistances d'isolement RM dans les conditions de fonctionnement recommandées données dans le Tableau 2;
- correction des valeurs numériques erronées de la contribution du bruit du système, f(T - S) dans le Tableau 3;
- ajout d'un conseil pour prescrire des exigences dans une spécification de composant applicable;
- ajout d'un ensemble de conditions de mesure recommandées pour des spécimens dont la dissipation assignée est inférieure à 100 mW;
- révision éditoriale complète.

General Information

Status
Published
Publication Date
06-Apr-2016
Current Stage
PPUB - Publication issued
Start Date
15-Apr-2016
Completion Date
07-Apr-2016
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IEC 60195 ®
Edition 2.0 2016-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Method of measurement of current noise generated in fixed resistors

Méthode pour la mesure du bruit produit en charge par les résistances fixes

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IEC 60195 ®
Edition 2.0 2016-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Method of measurement of current noise generated in fixed resistors

Méthode pour la mesure du bruit produit en charge par les résistances fixes

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 31.040.10 ISBN 978-2-8322-3272-9

– 2 – IEC 60195:2016  IEC 2016
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references. 6
3 Terms and definitions . 6
4 Method of measurement . 7
4.1 Noise basics . 7
4.1.1 Noise . 7
4.1.2 Thermal noise . 8
4.1.3 Current noise . 8
4.2 Measurement principle . 9
4.3 Measurement system . 10
4.3.1 Proposal of a suitable measuring system . 10
4.3.2 Alternative measuring systems . 11
4.4 Measurement system requirements . 11
4.4.1 Input circuit . 11
4.4.2 Isolation resistor R . 12
M
4.4.3 DC voltage source . 12
4.4.4 DC electronic voltmeter . 12
4.4.5 Calibration resistor R . 12
Cal
4.4.6 Calibration source . 13
4.4.7 Determination of the calibration voltage . 13
4.4.8 AC band-pass amplifier . 15
4.4.9 AC r.m.s. meter . 16
4.4.10 Test fixture . 16
4.5 Verification of the measuring system . 17
4.5.1 Performance check by measurement of instrument and thermal noise . 17
4.5.2 Performance check by comparison of repeated measurements . 17
5 Measurement procedure . 18
5.1 Ambient conditions . 18
5.2 Preparation of specimen . 18
5.3 Procedure . 18
5.3.1 General . 18
5.3.2 Calibration . 18
5.3.3 Measurement of system noise S . 18
5.3.4 Measurement of total noise T . 19
5.4 Precautions . 22
6 Evaluation of measurement results . 22
6.1 Term for the contribution of system noise . 22
6.2 Determination of the current-noise index A . 24
6.3 Determination of the current-noise voltage ratio CNR . 25
U
6.4 Accuracy . 26
6.5 Requirements . 26
7 Information to be given in the relevant component specification . 26
Annex A (informative) Letter symbols and abbreviations . 27
A.1 Letter symbols . 27

A.2 Abbreviations . 27
Annex X (informative) Cross-reference for references to the prior revision of this
standard . 28
Bibliography . 29

Figure 1 – Block schematic of a suitable measuring system . 11
Figure 2 – Typical transfer function of the band-pass amplifier . 16
Figure 3 – Contribution of system noise, f(T – S) . 23

Table 1 – Permissible limits of system noise . 17
Table 2 – Recommended operating conditions (1 of 2) . 20
Table 3 – Numeric values of the contribution of system noise, f(T – S) . 24
st
Table X.1 – Cross reference for references to the 1 edition of this standard . 28

– 4 – IEC 60195:2016  IEC 2016
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
METHOD OF MEASUREMENT OF CURRENT
NOISE GENERATED IN FIXED RESISTORS

FOREWORD
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interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that s
...

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