Potentiometers for use in electronic equipment - Part 1: Generic specification

IEC 60393-1:2008 is applicable to all types of resistive potentiometers, including lead- screw actuated types, presets, multi-turn units, etc., to be used in electronic equipment. It establishes standard terms, inspection procedures and methods of test for use in sectional and detail specifications of electronic components for quality assessment or any other purpose. It has been mainly written, and the test methods described, to conform to the widely used single-turn rotary potentiometer with an operating shaft. This edition contains the following significant technical changes with respect to the previous edition: implementation of Annex H which replaces Section 3 of the previous edition. It also includes minor revisions related to tables, figures and references.

Potentiomètres utilisés dans les équipements électroniques - Partie 1: Spécification générique

L'IEC 60393-1:2008 est applicable à tous les types de potentiomètres résistifs, y compris les potentiomètres à commande par vis, les potentiomètres d'ajustement, les potentiomètres multitours, etc., utilisés dans les équipements électroniques. Elle définit les termes normalisés et établit des procédures de contrôle et des méthodes d'essai normalisées à utiliser dans les spécifications intermédiaires et particulières de composants électroniques pour l'assurance de la qualité ou à toute autre fin. Elle a été principalement rédigée, et les méthodes d'essai ont été décrites, pour être en conformité avec les potentiomètres rotatifs monotour avec axe de commande, qui sont largement répandus. Cette édition comporte les modifications techniques significatives suivantes par rapport à la précédente édition: mise en oeuvre de l'Annexe H, qui remplace la section 3 de la précédente édition.

General Information

Status
Published
Publication Date
13-May-2008
Current Stage
PPUB - Publication issued
Start Date
14-May-2008
Completion Date
14-May-2008
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IEC 60393-1
Edition 3.0 2008-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Potentiometers for use in electronic equipment –
Part 1: Generic specification
Potentiomètres utilisés dans les équipements électroniques –
Partie 1: Spécification générique
IEC 60393-1:2008-05(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 60393-1
Edition 3.0 2008-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Potentiometers for use in electronic equipment –
Part 1: Generic specification
Potentiomètres utilisés dans les équipements électroniques –
Partie 1: Spécification générique
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 31.040.20 ISBN 978-2-8322-3379-5

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 60393-1:2008  IEC 2008
CONTENTS

FOREWORD......................................................................................................................... 6

1 General .......................................................................................................................... 8

1.1 Scope.................................................................................................................... 8

1.2 Normative references ............................................................................................ 8

2 Technical data .............................................................................................................. 10

2.1 Units and symbols ............................................................................................... 10

2.2 Terms and definitions .......................................................................................... 10

2.3 Preferred values .................................................................................................. 28

2.4 Marking ............................................................................................................... 28

3 Assessment procedures ................................................................................................ 28

4 Test and measurement procedures ............................................................................... 28

4.1 General ............................................................................................................... 28

4.2 Standard atmospheric conditions ......................................................................... 29

4.3 Drying ................................................................................................................. 30

4.4 Visual examination and check of dimensions ........................................................ 30

4.5 Continuity (except for continuously rotating potentiometers) ................................. 32

4.6 Element resistance .............................................................................................. 32

4.7 Terminal resistance ............................................................................................. 33

4.8 Maximum attenuation ........................................................................................... 33

4.9 Resistance law (conformity) ................................................................................. 33

4.10 Matching of the resistance law (for ganged potentiometers only)........................... 34

4.11 Switch contact resistance (when appropriate) ....................................................... 34

4.12 Voltage proof (insulated styles only) ..................................................................... 38

4.13 Insulation resistance (insulated styles only) .......................................................... 39

4.14 Variation of resistance with temperature ............................................................... 40

4.15 Rotational noise................................................................................................... 42

4.16 Contact resistance at low-voltage levels ............................................................... 44

4.17 Setting ability (adjustability) and setting stability ................................................... 45

4.18 Starting torque ..................................................................................................... 49

4.19 Switch torque ...................................................................................................... 49

4.20 End stop torque ................................................................................................... 50

4.21 Locking torque ..................................................................................................... 50

4.22 Thrust and pull on shaft ....................................................................................... 51

4.23 Shaft run-out ....................................................................................................... 52

4.24 Lateral run-out ..................................................................................................... 53

4.25 Pilot (or spigot) diameter run-out .......................................................................... 53

4.26 Shaft end play ..................................................................................................... 54

4.27 Backlash ............................................................................................................. 55

4.28 Dither .................................................................................................................. 57

4.29 Output smoothness .............................................................................................. 58

4.30 Robustness of terminals ...................................................................................... 59

4.31 Sealing ................................................................................................................ 60

4.32 Solderability ........................................................................................................ 61

4.33 Resistance to soldering heat ................................................................................ 61

4.34 Change of temperature ........................................................................................ 62

---------------------- Page: 4 ----------------------
IEC 60393-1:2008  IEC 2008 – 3 –

4.35 Vibration.............................................................................................................. 63

4.36 Bump .................................................................................................................. 64

4.37 Shock .................................................................................................................. 64

4.38 Climatic sequence ............................................................................................... 65

4.39 Damp heat, steady state ...................................................................................... 67

4.40 Mechanical endurance (potentiometers) ............................................................... 68

4.41 AC endurance testing of mains switches on capacitive loads ................................ 71

4.42 DC endurance testing of switches ........................................................................ 73

4.43 Electrical endurance ............................................................................................ 74

4.44 Component solvent resistance ............................................................................. 78

4.45 Solvent resistance of the marking ........................................................................ 78

4.46 Microlinearity ....................................................................................................... 79

4.47 Mounting (for surface mount potentiometers) ........................................................ 81

4.48 Shear (adhesion) test .......................................................................................... 83

4.49 Substrate bending test (formerly bond strength of the end face plating) ................ 83

4.50 Solderability (for surface mount potentiometers) ................................................... 83

4.51 Resistance to soldering heat (for surface mount potentiometers) .......................... 83

Annex A (normative) Rules for the preparation of detail specifications for capacitors

and resistors for electronic equipment ................................................................................. 84

Annex B (normative) Interpretation of sampling plans and procedures as described in

IEC 60410 for use within the IEC Quality Assessment System for Electronic

Components ....................................................................................................................... 85

Annex C (normative) Measuring methods for rotational noise .............................................. 86

Annex D (normative) Apparatus for measuring mechanical accuracy ................................... 89

Annex E (normative) Measuring method for microlinearity ................................................... 90

Annex F (normative) Preferred dimensions of shaft ends, bushes and for the mounting

hole, bush-mounted, shaft-operated electronic components ................................................. 92

Annex G (informative) Example of common potentiometer’s law .......................................... 93

Annex H (normative) Quality assessment procedures ......................................................... 95

Figure 1 – Shaft-sealed potentiometer ................................................................................. 14

Figure 2 – Shaft- and panel-sealed potentiometer ................................................................ 14

Figure 3 – Fully sealed potentiometer .................................................................................. 14

Figure 4 – Linear law .......................................................................................................... 16

Figure 5 – Logarithmic law .................................................................................................. 16

Figure 6 – Inverse logarithmic law ....................................................................................... 16

Figure 7 – Output ratio ........................................................................................................ 17

Figure 8 – Loading error ..................................................................................................... 18

Figure 9 – Total mechanical travel (or angle of rotation) ...................................................... 18

Figure 10 – Conformity ....................................................................................................... 20

Figure 11 – Absolute conformity .......................................................................................... 20

Figure 12 – Linearity ........................................................................................................... 21

Figure 13 – Independent linearity ........................................................................................ 22

Figure 14 – Zero-based linearity .......................................................................................... 23

Figure 15 – Absolute linearity .............................................................................................. 24

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– 4 – IEC 60393-1:2008  IEC 2008

Figure 16 – Terminal based linearity .................................................................................... 25

Figure 17 – Effective tap width ............................................................................................ 25

Figure 18 – Backlash .......................................................................................................... 27

Figure 19 – Example of insulation resistance and voltage proof test jig for surface

mount potentiometers ......................................................................................................... 39

Figure 20 – Test circuit contact resistance ........................................................................... 45

Figure 21 – Measuring circuit for setting ability (as divider) .................................................. 46

Figure 22 – Measuring circuit for setting ability (as current controller) .................................. 47

Figure 23 – Shaft run-out .................................................................................................... 52

Figure 24 – Lateral run-out .................................................................................................. 53

Figure 25 – Pilot (spigot) diameter run-out ........................................................................... 54

Figure 26 – Shaft end play .................................................................................................. 55

Figure 27 – Test circuit for measurement of backlash .......................................................... 56

Figure 28 – Measurement of backlash ................................................................................. 57

Figure 29 – Test circuit for measurement of output smoothness ........................................... 58

Figure 30 – The circuit for continuous monitoring of the contact resistance .......................... 71

Figure 31 – Test circuit a.c. endurance testing .................................................................... 72

Figure 32 – Test circuit d.c. endurance testing .................................................................... 73

Figure 33 – Example of microlinearity measurement ............................................................ 79

Figure 34 – Block diagram of a circuit for evaluation of microlinearity ................................... 80

Figure 35 – Example of simultaneous evaluation of linearity and microlinearity ..................... 80

Figure 36 – Suitable substrate for mechanical and electrical tests (may not be suitable

for impedance measurements) ............................................................................................ 82

Figure 37 – Suitable substrate for electrical tests................................................................. 82

Figure C.1 – Measuring circuit for method A, rotational noise ............................................... 87

Figure C.2 – Measuring circuit for CRV ............................................................................... 87

Figure C.3 – Measuring circuit for ENR ............................................................................... 88

Figure E.1 – Block diagram of a digital reference unit (synthetic high-precision master) ....... 90

Figure G.1 – Definition of rotation (shaft-end view) .............................................................. 93

Figure G.2 – Linear law, without centre tap .......................................................................... 94

Figure G.3 – Linear law, with centre tap .............................................................................. 94

Figure G.4 – Logarithmic law, without tap ............................................................................ 94

Figure G.5 – Logarithmic law, with tap ................................................................................. 94

Figure G.6 – Inverse logarithmic law without tap .................................................................. 94

Figure G.7 – Inverse logarithmic law with tap ...................................................................... 94

Figure H.1 – General scheme for capability approval ........................................................... 98

Table 1 – Standard atmospheric conditions ......................................................................... 30

Table 2 – Measuring voltages ............................................................................................. 32

Table 3 – Calculation of resistance value (R) and change in resistance (ΔR) ........................ 41

Table 4 – Calculation of temperature differences (∆T) .......................................................... 41

Table 5 – Current values (IB ) ............................................................................................ 43

Table 6 – Moving contact current ........................................................................................ 48

Table 7 – End stop torque ................................................................................................... 50

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IEC 60393-1:2008  IEC 2008 – 5 –

Table 8 – Locking torque ..................................................................................................... 50

Table 9 – Shaft torque ........................................................................................................ 51

Table 10 – Thrust and pull .................................................................................................. 51

Table 11 – Thrust and pull .................................................................................................. 52

Table 12 – Backlash ........................................................................................................... 57

Table 13 – Dither for non-wire wound types ......................................................................... 57

Table 14 – Dither for wire wound types (under consideration) .............................................. 58

Table 15 – Tensile force ..................................................................................................... 59

Table 16 – Number of cycles ............................................................................................... 66

Table 17 – Number of cycles ............................................................................................... 69

Table 18 – Number of operations ........................................................................................ 73

Table 19 – Panel size ......................................................................................................... 75

Table G.1 – Resistance law and code letter ......................................................................... 93

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– 6 – IEC 60393-1:2008  IEC 2008
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
POTENTIOMETERS FOR USE IN ELECTRONIC EQUIPMENT –
Part 1: Generic specification
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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governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely

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

agreement between the two organizations.

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

consensus of opinion on the relevant subjects since each technical committee has representation from all

interested IEC National Committees.

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

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Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any

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4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications

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5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any

equipment declared to be in conformity with an IEC Publication.

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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 60393-1 has been prepared by IEC technical committee 40:

Capacitors and resistors for electronic equipment.

This bilingual version (2016-05) corresponds to the English version, published in 2008-05.

This third edition cancels and replaces the second edition published in 1989 and constitutes a

technical revision, including minor revisions related to tables, figures and references.

This edition contains the following significant technical changes with respect to the previous

edition:
• implementation of Annex H which replaces Section 3 of the previous edition.
---------------------- Page: 8 ----------------------
IEC 60393-1:2008  IEC 2008 – 7 –
The text of this standard is based on the following documents:
FDIS Report on voting
40/1897/FDIS 40/1914/RVD

Full information on the voting for the approval of this standard can be found in the report on

voting indicated in the above table.
The French version of this standard has not been voted upon.

This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

A list of all the parts of the IEC 60393 series, under the general title Potentiometers for use in

electronic equipment, can be found on the IEC web site.

The committee has decided that the contents of this publication will remain unchanged until

the maintenance result date indicated on the IEC web site under "http://webstore.iec.ch" in

the data related to the specific publication. At this date, the publication will be

• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
---------------------- Page: 9 ----------------------
– 8 – IEC 60393-1:2008  IEC 2008
POTENTIOMETERS FOR USE IN ELECTRONIC EQUIPMENT –
Part 1: Generic specification
1 General
1.1 Scope

This part of IEC 60393 is applicable to all types of resistive potentiometers, including lead-

screw actuated types, presets, multi-turn units, etc., to be used in electronic equipment.

It establishes standard terms, inspection procedures and methods of test for use in sectional

and detail specifications of electronic components for quality assessment or any other

purpose.
It has been mainly
...

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