Potentiometers for use in electronic equipment - Part 2: Sectional specification - Lead-screw actuated and rotary preset potentiometers

IEC 60393-2:2015 applies to lead-screw actuated and rotary preset potentiometers, wirewound and non-wirewound for use in electronic equipment. These potentiometers are primarily intended for use in circuits for trimming purposes which require infrequent adjustments. This part of IEC 60393 prescribes preferred ratings and characteristics and selects from IEC 60393-1 the appropriate quality assessment procedures, tests and measuring methods. It provides general performance requirements for this type of potentiometer. This standard gives the minimum performance requirements and test severities. This edition includes the following significant technical changes with respect to the previous edition:
a) revision of the information on the assessment level EZ and FZ (zero nonconforming);
b) complete editorial revision.
This publication is to be read in conjunction with IEC 60393-1:2008.

Potentiomètres utilisés dans les équipements électroniques - Partie 2: Spécification intermédiaire - Potentiomètres d'ajustement multitours et rotatifs

L'IEC 60393-2:2015 est applicable aux potentiomètres d'ajustement multitours et rotatifs, bobinés et non bobinés utilisés dans des équipements électroniques. Ces potentiomètres sont principalement conçus pour être utilisés pour le réglage de circuits n'exigeant que des réglages peu fréquents. La présente partie de l'IEC 60393 prescrit des valeurs assignées et des caractéristiques préférentielles et sélectionne dans l'IEC 60393-1 des procédures d'assurance de la qualité, des essais et des méthodes de mesure appropriés. Elle donne les exigences de performances générales pour ce type de potentiomètre. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
a) révision des informations sur les niveaux d'assurance EZ et FZ (zéro non-conformité);
b) révision éditoriale complète.
Cette publication doit être lue conjointement avec la IEC 60393-1:2008.

General Information

Status
Published
Publication Date
13-Dec-2015
Current Stage
PPUB - Publication issued
Start Date
14-Dec-2015
Completion Date
14-Dec-2015
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IEC 60393-2
Edition 3.0 2015-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Potentiometers for use in electronic equipment –
Part 2: Sectional specification – Lead-screw actuated and rotary preset
potentiometers
Potentiomètres utilisés dans les équipements électroniques –

Partie 2: Spécification intermédiaire – Potentiomètres d'ajustement multitours et

rotatifs
IEC 60393-2:2015-12(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 60393-2
Edition 3.0 2015-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Potentiometers for use in electronic equipment –
Part 2: Sectional specification – Lead-screw actuated and rotary preset
potentiometers
Potentiomètres utilisés dans les équipements électroniques –

Partie 2: Spécification intermédiaire – Potentiomètres d'ajustement multitours et

rotatifs
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 31.040.20 ISBN 978-2-8322-3060-2

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 60393-2:2015  IEC 2015
CONTENTS

FOREWORD ........................................................................................................................... 4

1 General ........................................................................................................................... 6

1.1 Scope ..................................................................................................................... 6

1.2 Normative references .............................................................................................. 6

1.3 Information to be given in a detail specification ....................................................... 6

1.3.1 General ........................................................................................................... 6

1.3.2 Outline drawing and dimensions ...................................................................... 7

1.3.3 Mounting ......................................................................................................... 7

1.3.4 Style ................................................................................................................ 7

1.3.5 Resistance law ................................................................................................ 7

1.3.6 Ratings and characteristics .............................................................................. 7

1.3.7 Marking ........................................................................................................... 8

1.3.8 Ordering information ........................................................................................ 8

1.3.9 Additional information (not for inspection purposes) ......................................... 8

1.4 Marking ................................................................................................................... 8

1.4.1 General ........................................................................................................... 8

1.4.2 Marking for potentiometers .............................................................................. 8

1.4.3 Marking for packaging ..................................................................................... 8

1.4.4 Additional marking ........................................................................................... 8

2 Preferred ratings, characteristics and test severities ........................................................ 9

2.1 Preferred characteristics ......................................................................................... 9

2.1.1 General ........................................................................................................... 9

2.1.2 Preferred climatic categories ........................................................................... 9

2.1.3 Temperature coefficients and temperature characteristics of resistance ........... 9

2.1.4 Limits for change in resistance or output voltage ratio ................................... 10

2.1.5 Total mechanical travel .................................................................................. 11

2.2 Preferred values of ratings .................................................................................... 11

2.2.1 General ......................................................................................................... 11

2.2.2 Nominal total resistance ................................................................................ 11

2.2.3 Tolerances on nominal total resistance .......................................................... 12

2.2.4 Rated dissipation ........................................................................................... 12

2.2.5 Limiting element voltage ................................................................................ 13

2.2.6 Insulation voltage .......................................................................................... 13

2.2.7 Limits for insulation resistance ....................................................................... 13

2.3 Preferred test severities ........................................................................................ 13

2.3.1 General ......................................................................................................... 13

2.3.2 Drying ............................................................................................................ 13

2.3.3 Vibration ........................................................................................................ 14

2.3.4 Shock ............................................................................................................ 14

2.3.5 Low air pressure ............................................................................................ 14

2.3.6 Change of temperature .................................................................................. 14

3 Quality assessment procedures ..................................................................................... 14

3.1 General ................................................................................................................. 14

3.2 Definitions............................................................................................................. 14

3.2.1 Primary stage of manufacture ........................................................................ 14

3.2.2 Structurally similar components ..................................................................... 14

---------------------- Page: 4 ----------------------
IEC 60393-2:2015  IEC 2015 – 3 –

3.2.3 Assessment levels EZ and FZ (zero nonconforming) ...................................... 15

3.3 Qualification approval ........................................................................................... 15

3.3.1 General ......................................................................................................... 15

3.3.2 Qualification approval on the basis of the fixed sample size procedure .......... 15

3.3.3 Tests ............................................................................................................. 16

3.4 Quality conformance inspection ............................................................................ 23

3.4.1 Formation of inspection lots ........................................................................... 23

3.4.2 Test schedule ................................................................................................ 23

3.4.3 Assessment levels ......................................................................................... 23

3.5 Delayed delivery ................................................................................................... 26

Bibliography .......................................................................................................................... 27

Figure 1 – Rated dissipation curve ........................................................................................ 12

Figure 2 – Rated dissipation curve ........................................................................................ 13

Table 1 – Temperature coefficients and temperature characteristics of resistance ................ 10

Table 2 – Limits for change in resistance or output voltage ratio ........................................... 11

Table 3 – Fixed sample size test schedule for qualification approval (1 of 7) ......................... 17

Table 4 – Quality conformance inspection: Lot-by-lot inspection ........................................... 24

Table 5 – Quality conformance inspection: Periodic testing (1 of 2)....................................... 25

---------------------- Page: 5 ----------------------
– 4 – IEC 60393-2:2015  IEC 2015
INTERNATIONAL ELECTROTECHNICAL COMMISSION
______________
POTENTIOMETERS FOR USE IN ELECTRONIC EQUIPMENT –
Part 2: Sectional specification – Lead-screw actuated
and rotary preset potentiometers
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, governmental and non-

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

Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC

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

misinterpretation by any end user.

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

transparently to the maximum extent possible in their national and regional publications. Any divergence

between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in

the latter.

5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity

assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any

services carried out by independent certification bodies.

6) All users should ensure that they have the latest edition of this publication.

7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and

members of its technical committees and IEC National Committees for any personal injury, property damage or

other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and

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 60393-2 has been prepared by IEC technical committee 40:

Capacitors and resistors for electronic equipment.

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

technical revision.

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

edition:

a) revision of the information on the assessment level EZ and FZ (zero nonconforming);

b) complete editorial revision.
---------------------- Page: 6 ----------------------
IEC 60393-2:2015  IEC 2015 – 5 –
The text of this standard is based on the following documents:
FDIS Report on voting
40/2407/FDIS 40/2422/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.
This International Standard is to be used in conjunction with IEC 60393-1:2008.

A list of all parts in the IEC 60363 series, published under the general title Potentiometers for

use in electronic equipment, can be found on the IEC website.

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

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

the stability 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: 7 ----------------------
– 6 – IEC 60393-2:2015  IEC 2015
POTENTIOMETERS FOR USE IN ELECTRONIC EQUIPMENT –
Part 2: Sectional specification – Lead-screw actuated
and rotary preset potentiometers
1 General
1.1 Scope

This part of IEC 60393 applies to lead-screw actuated and rotary preset potentiometers,

wirewound and non-wirewound for use in electronic equipment. These potentiometers are

primarily intended for use in circuits for trimming purposes which require infrequent

adjustments.

This part of IEC 60393 prescribes preferred ratings and characteristics and selects from

IEC 60393-1 the appropriate quality assessment procedures, tests and measuring methods. It

provides general performance requirements for this type of potentiometer.
This standard gives the minimum performance requirements and test severities.
1.2 Normative references

The following documents, in whole or in part, are normatively referenced in this document and

are indispensable for its application. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any
amendments) applies.
IEC 60062, Marking codes for resistors and capacitors
IEC 60068-1:2013, Environmental testing – Part 1: General and guidance
IEC 60068-2-1:2007, Environmental testing – Part 2-1: Tests – Test A: Cold
IEC 60068-2-2:2007, Environmental testing – Part 2-2: Tests – Test B: Dry heat

IEC 60393-1:2008, Potentiometers for use in electronic equipment – Part 1: Generic

specification

IEC 61193-2:2007, Quality assessment systems – Part 2: Selection and use of sampling

plans for inspection of electronic components and packages
1.3 Information to be given in a detail specification
1.3.1 General

Detail specifications shall be derived from the relevant blank detail specification.

Detail specifications shall not specify requirements inferior to those of the generic, sectional

or blank detail specification. When severer requirements are included, they shall be listed in a

subclause of the detail specification and indicated in the test schedules, for example by an

asterisk.

The information given in 1.3.2 and 1.3.4 may, for convenience, be presented in tabular form.

---------------------- Page: 8 ----------------------
IEC 60393-2:2015  IEC 2015 – 7 –

The following information shall be given in each detail specification and the values quoted

shall preferably be selected from those given in the appropriate clause of this sectional

specification.
1.3.2 Outline drawing and dimensions

The detail specification shall incorporate an illustration of the potentiometer being specified.

Where space is insufficient to show the detail dimensions required for inspection purposes,

such dimensions shall appear on a drawing forming an annex to the detail specification.

All dimensions shall preferably be stated in millimetres, however, when the original

dimensions are still given in inches, the converted metric dimensions in millimetres shall be

added.

When the potentiometer is not designed for use on printed boards, this shall be clearly

indicated in the detail specification.
1.3.3 Mounting

The detail specification shall specify the method of mounting to be applied for the voltage

proof and the insulation resistance tests and for the application of the vibration and shock

tests. The potentiometers shall be mounted by their normal means, but the design may be

such that special mounting fixtures are required. In this case the detail specification shall

describe the mounting fixtures and they shall be used for the voltage proof and the insulation

resistance tests and for the application of the vibration and shock tests. For the latter tests

the mounting shall be such that there shall be no parasitic vibration.
1.3.4 Style
See IEC 60393-1:2008, 2.2.2.

The style shall be presented by a double-letter code, e.g. AB, which is arbitrarily chosen for

each detail specification.

The style designation, therefore, has no meaning unless the number of the detail specification

is also given.
1.3.5 Resistance law

The resistance law is generally not verified. If required, the detail specification shall prescribe

the measuring points and the associated limits for the output ratio and shall specify the

position of the corresponding tests in the test schedules.
1.3.6 Ratings and characteristics
1.3.6.1 General

The ratings and characteristics shall be in accordance with the relevant clauses of this

standard together with 1.3.6.2.
1.3.6.2 Nominal total resistance
See IEC 60393-1:2008, 2.3.2.

When products approved according to the detail specification have different ranges, the

following statement should be added:

“The range of values available in each style is given in the register of approvals, available for

example on the website http://www.iecq.org/
---------------------- Page: 9 ----------------------
– 8 – IEC 60393-2:2015  IEC 2015

The qualified products list “QPL” style is given in the register of approvals, available, for

example, on the website as stated above.
1.3.7 Marking

The detail specification shall specify the content of the marking on the potentiometer and on

the package. Deviations from 1.4 of this sectional specification shall be specifically stated.

1.3.8 Ordering information

The detail specification shall indicate that the following information, in clear or in coded form,

is required when ordering:
a) nominal total resistance and tolerance on nominal total resistance;
b) resistance law (if other than linear);
c) number and issue reference of the detail specification and style reference.
1.3.9 Additional information (not for inspection purposes)

The detail specification may include information which is not required to be verified by the

inspection procedure, such as circuit diagrams, curves, drawings and notes needed for the

clarification of the detail specification.
1.4 Marking
1.4.1 General

When coding is used for nominal resistance, tolerance and date of manufacture, the method

shall be selected from those given in IEC 60062.

The information given in the marking is normally selected from the following list. The relative

importance of each item is indicated by its position in the list:
a) nominal total resistance;
b) tolerance on nominal total resistance;
c) resistance law (if other than linear);
d) detail specification and style reference;
e) year and month (or week) of manufacture;
f) manufacturer's name and/or trademark;
g) manufacturer’s type designation.
1.4.2 Marking for potentiometers

The potentiometer shall be clearly marked with a) and b) of 1.4.1 and with as many of the

remaining items as is practicable. Any duplication of information in the marking of the

potentiometer should be avoided.
1.4.3 Marking for packaging

The package containing the potentiometer(s) shall be clearly marked with all the information

listed in 1.4.1 and below.
a) quantity
b) country origin
1.4.4 Additional marking
Any additional marking shall be so applied that no confusion can arise.
---------------------- Page: 10 ----------------------
IEC 60393-2:2015  IEC 2015 – 9 –
2 Preferred ratings, characteristics and test severities
2.1 Preferred characteristics
2.1.1 General

The values given in the detail specification shall preferably be selected from the following:

2.1.2 Preferred climatic categories

The potentiometers covered by this standard are classified into climatic categories according

to the general rules given in IEC 60068-1:2013, Annex A.

The lower and upper category temperature and the duration of the damp heat, steady state

test shall be chosen from the following:
Lower category temperature: –65 °C, –55 °C, –40 °C, –25 °C and –10 °C.
Upper category temperature +70 °C, +85 °C, +100 °C, +125 °C and +155 °C.
Duration of the damp heat, steady state test: 4, 10, 21 and 56 days.

The severities for the cold and dry heat tests are the lower and upper category temperatures

respectively. Because of the construction of some potentiometers these temperatures will

occur between two of the preferred temperatures given in IEC 60068-2-1:2007 and

IEC 60068-2-2:2007. In this case the nearest preferred temperature within the actual

temperature range of the potentiometer shall be chosen for this severity.
2.1.3 Temperature coefficients and temperature characteristics of resistance

The limits of change in resistance for the preferred temperature characteristics of resistance

are given in Table 1.

Each line in the table gives the preferred temperature coefficients and corresponding

temperature characteristics for 20 °C to 70 °C and limits of change in resistance for

measurement of the temperature characteristics of resistance (see IEC 60393-1:2008, 4.14)

on the basis of the category temperature ranges of 2.1.2.

Different portions of the resistance range may be covered by different temperature

characteristics (or coefficients) of resistance although they appear in a single detail

specification.

If measurements at additional temperatures are required, they shall be specified in the detail

specification.
---------------------- Page: 11 ----------------------
– 10 – IEC 60393-2:2015  IEC 2015
Table 1 – Temperature coefficients and temperature characteristics of resistance
Tempera- Temperature Temperature characteristics of resistance
ture characteristics (limits of resistance change in percentage)
coeffi- of resistance %
cients of
Reference temperature/ Reference temperature/
resistance
Lower category temperature Upper category temperature
10 /K % °C °C
20 °C / 70 °C 20/85 20/100 20/125 20/155
+20/–65 +20/–55 +20/–40 +20/–25 +20/–10
–5,2/ –8,4/ –10,8/
–800/ –4/ +6,8/ +6/ +4,8/ +3,6/ +2,4/ –6,4/
– – –
–2 500 –12,5 –20
+21,3 +18,75 +15 +11,3 +7,5
16,25 26,25 33,75
–4,2/
–400/ –2/ +3,4/ +3/ +2,4/ +1,8/ +1,2/ –2,6/ –3,2/ –5,4/
–1 000 –5 +8,5 +7,5 +6 +4,5 +3 –6,5 –8 –13,5
10,25
–150/ -0,75/ +1,3/ +1,13/ +0,9/ +0,68/ +0,45/ –0,98/ –1,2/ –1,58/ –2,02/
– 600 -3 –3,9 –4,8 –6,3 –8,2
+5,1 +4,5 +3,6 +2,7 +1,8
±1 000 ±5 ±8,5 ±7,5 ±6 ±4,5 ±3 ±6,5 ±8 ±10,5 ±13,5
±500 ±2,5 ±4,3 ±3,75 ±3 ±2,25 ±1,
...

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