SIST EN IEC 60393-3:2023

SLOVENSKI STANDARD
01-november-2023
Potenciometri za elektronsko opremo - 3. del: Področna specifikacija: Natančni
rotacijski potenciometri (IEC 60393-3:2023)
Potentiometers for use in electronic equipment - Part 3: Sectional specification: Rotary
precision potentiometers (IEC 60393-3:2023)
Potentiometer zur Verwendung in Geräten der Elektronik – Teil 3: Rahmenspezifikation:
Drehpräzisionspotentiometer (IEC 60393-3:2023)
Potentiomètres utilisés dans les équipements électroniques - Partie 3: Spécification
intermédiaire: Potentiomètres de précision rotatifs (IEC 60393-3:2023)
Ta slovenski standard je istoveten z: EN IEC 60393-3:2023
ICS:
31.040.20 Potenciometri, spremenljivi Potentiometers, variable
upori resistors
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN IEC 60393-3

NORME EUROPÉENNE
EUROPÄISCHE NORM September 2023
ICS 31.040.20
English Version
Potentiometers for use in electronic equipment - Part 3:
Sectional specification: Rotary precision potentiometers
(IEC 60393-3:2023)
Potentiomètres utilisés dans les équipements électroniques Potentiometer zur Verwendung in Geräten der Elektronik -
- Partie 3: Spécification intermédiaire: Potentiomètres de Teil 3: Rahmenspezifikation: Drehpräzisionspotentiometer
précision rotatifs (IEC 60393-3:2023)
(IEC 60393-3:2023)
This European Standard was approved by CENELEC on 2023-09-22. 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,
Türkiye 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
© 2023 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 60393-3:2023 E

European foreword
The text of document 40/3058/FDIS, future edition 3 of IEC 60393-3, prepared by IEC/TC 40
"Capacitors and resistors for electronic equipment" was submitted to the IEC-CENELEC parallel vote
and approved by CENELEC as EN IEC 60393-3:2023.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2024-06-22
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2026-09-22
document have to be withdrawn
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.
Any feedback and questions on this document should be directed to the users’ national committee. A
complete listing of these bodies can be found on the CENELEC website.
A preceding document on the subject covered by this specification has been:
— CECC 41400:1979
Endorsement notice
The text of the International Standard IEC 60393-3:2023 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following note has to be added for the standard indicated:
IEC 60915 NOTE Approved as EN 60915
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.cencenelec.eu.
Publication Year Title EN/HD Year
IEC 60062 - Marking codes for resistors and capacitors EN 60062 -
IEC 60068-1 2013 Environmental testing - Part 1: General EN 60068-1 2014
and guidance
IEC 60068-2-1 - Environmental testing - Part 2-1: Tests - EN 60068-2-1 -
Test A: Cold
IEC 60068-2-2 - Environmental testing - Part 2-2: Tests - EN 60068-2-2 -
Test B: Dry heat
IEC 60393-1 2008 Potentiometers for use in electronic EN 60393-1 2009
equipment - Part 1: Generic specification
IEC 61193-2 - Quality assessment systems - Part 2: EN 61193-2 -
Selection and use of sampling plans for
inspection of electronic components and
packages
IEC 60393-3 ®
Edition 3.0 2023-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Potentiometers for use in electronic equipment –

Part 3: Sectional specification: Rotary precision potentiometers

Potentiomètres utilisés dans les équipements électroniques –

Partie 3: Spécification intermédiaire: Potentiomètres de précision rotatifs

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 31.040.20  ISBN 978-2-8322-7359-3

– 2 – IEC 60393-3:2023 © IEC 2023
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 Preferred characteristics . 6
4.1 General . 6
4.2 Style and dimensions . 7
4.2.1 Style . 7
4.2.2 Outline drawing and dimensions . 7
4.3 Preferred climatic categories . 9
4.4 Resistance law . 9
4.5 Nominal total resistance . 9
4.6 Tolerances on nominal total resistance . 9
4.7 Rated dissipation . 9
4.8 Limiting element voltage . 10
4.9 Insulation voltage . 11
4.10 Resolution (when applicable) . 11
5 Test and test severities. 11
5.1 General . 11
5.2 Mounting . 11
5.3 Drying . 11
5.4 Vibration . 11
5.5 Bump . 11
5.6 Shock . 12
5.7 Solderability . 12
5.7.1 Solder bath method (Method 1) . 12
5.7.2 Soldering iron method (Method 2) . 12
5.8 Linearity . 12
5.9 Angle of effective travel . 12
5.10 Dither . 13
6 Preferred characteristics . 13
6.1 General . 13
6.2 Temperature coefficients of resistance . 13
6.3 Limits for change in resistance or output voltage ratio . 14
6.4 Limits for insulation resistance . 14
6.5 Limits for resistance law . 14
6.6 Solderability . 14
7 Marking, packaging and ordering information . 15
7.1 General . 15
7.2 Marking for potentiometers . 15
7.3 Marking for packaging . 15
7.4 Additional marking . 15
7.5 Ordering information . 15
8 Preferred values of ratings. 16
8.1 General . 16
8.2 Information to be specified in a detail specification . 16

IEC 60393-3:2023 © IEC 2023 – 3 –
8.2.1 Outline drawing or illustration . 16
8.2.2 Style and dimensions . 16
8.3 Ratings and characteristics . 16
8.3.1 General . 16
8.3.2 Nominal total resistance range . 16
8.4 Additional information . 16
9 Quality assessment procedures . 17
9.1 General . 17
9.2 Definitions. 17
9.2.1 Primary stage of manufacture . 17
9.2.2 Structurally similar components . 17
9.3 Assessment level EZ . 17
10 Qualification approval . 17
10.1 General . 17
10.2 Qualification approval on the basis of the fixed sample size procedure . 17
10.3 Tests . 18
11 Quality conformance inspection . 29
11.1 Formation of inspection lots . 29
11.2 Test schedule . 29
11.3 Assessment levels . 29
11.4 Delayed delivery . 31
Annex A (normative) Symbols and abbreviated terms . 32
A.1 Symbols . 32
A.2 Abbreviated terms . 33
Bibliography . 34

Figure 1 – Outline drawing and dimensions . 8
Figure 2 – Rated dissipation curve . 10
Figure 3 – Rated dissipation curve (examples of lager area) . 10

Table 1 – Temperature coefficients . 13
Table 2 – Limits for change in resistance or output voltage ratio . 14
Table 3 – Test schedule for qualification approval . 19
Table 4 – Quality conformance inspection: lot-by-lot inspection . 30
Table 5 – Quality conformance inspection: periodic testing . 31

– 4 – IEC 60393-3:2023 © IEC 2023
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
POTENTIOMETERS FOR USE IN ELECTRONIC EQUIPMENT –

Part 3: Sectional specification: Rotary precision 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) IEC draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). IEC takes no position concerning the evidence, validity or applicability of any claimed patent rights in
respect thereof. As of the date of publication of this document, IEC had not received notice of (a) patent(s), which
may be required to implement this document. However, implementers are cautioned that this may not represent
the latest information, which may be obtained from the patent database available at https://patents.iec.ch. IEC
shall not be held responsible for identifying any or all such patent rights.
IEC 60393-3 has been prepared by IEC technical committee 40: Capacitors and resistors for
electronic equipment. It is an International Standard.
This third edition cancels and replaces the second edition published in 1992. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) revised all parts of the document based on the ISO/IEC Directives, Part 2:2018 (eighth
edition) and harmonized with other similar kinds of documents;
b) the document structure has been organized to follow new sectional specification structure
decided in TC 40;
c) revision of the information on the assessment level EZ (zero nonconforming).

IEC 60393-3:2023 © IEC 2023 – 5 –
The text of this International Standard is based on the following documents:
Draft Report on voting
40/3058/FDIS 40/3071/RVD
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English.
A list of all parts in the IEC 60393 series, published under the general title Potentiometers for
use in electronic equipment, can be found on the IEC website.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/publications.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
– 6 – IEC 60393-3:2023 © IEC 2023
POTENTIOMETERS FOR USE IN ELECTRONIC EQUIPMENT –

Part 3: Sectional specification: Rotary precision potentiometers

1 Scope
This part of IEC 60393 applies to rotary precision potentiometers for use in electronic equipment.
The object of this document is to prescribe preferred ratings and characteristics and to select
from IEC 60393-1, the appropriate quality assessment procedures, tests and measuring
methods and to give general performance requirements for this type of potentiometer.
This document gives the minimum performance requirements and test severities.
2 Normative references
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.
IEC 60062, Marking codes for resistors and capacitors
IEC 60068-1:2013, Environmental testing – Part 1: General and guidance
IEC 60068-2-1, Environmental testing – Part 2-1: Tests – Test A: Cold
IEC 60068-2-2, 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, Quality assessment systems – Part 2: Selection and use of sampling plans for
inspection of electronic components and packages
3 Terms and definitions
For the purposes of this document, the terms and definitions of IEC 60393-1:2008 apply.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at https://www.electropedia.org/
• ISO Online browsing platform: available at https://www.iso.org/obp
4 Preferred characteristics
4.1 General
The values given in detail specifications should be selected from the content of 4.2 to 4.10.

IEC 60393-3:2023 © IEC 2023 – 7 –
4.2 Style and dimensions
4.2.1 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.
4.2.2 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, as
shown in Figure 1.
– 8 – IEC 60393-3:2023 © IEC 2023

Style code: BM Style code: HS
Style code: PM-ST Style code: PM-RT

Key:
A Body wide or diameter
B Body height
C Body length
D Shaft diameter
E Bushing diameter or thread size
F Bushing length
G Distance from the mounting surface to the terminal centre
H Distance from shaft centre to the board surface
J Distance from mounting surface to terminal board
K Distance from shaft centre to terminal tip
L Shaft length
M Pitch circle diameter of terminals
P Distance between terminals
T Terminal diameter
d
T Terminal length
l
T Terminal thickness
t
T Terminal width
w
θ Terminal mounting angle
Figure 1 – Outline drawing and dimensions
The drawing shall give the following details:
– the dimensions of the shaft and bush. These may be given either on the outline drawing or
by reference to IEC 60915;
– any locating devices;
– the total mechanical travel;

IEC 60393-3:2023 © IEC 2023 – 9 –
– the effective electrical travel;
– the angle of ineffective mechanical travel;
– the dimensions and the location of terminals;
– the dimensions which shall be measured in accordance with IEC 60393-1:2008, 4.4.2;
– any other dimensional information which will adequately describe the potentiometer.
All dimensions shall be stated in millimetres. However, when the original dimensions are 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.
4.3 Preferred climatic categories
The potentiometers covered by this specification are classified into climatic categories in
accordance with 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: −55 °C, −40 °C and −10 °C.
Upper category temperature: +85 °C, +100 °C and +125 °C.
Duration of the damp heat, steady-state test: 21 days 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 and IEC 60068-2-2.
In this case, the nearest preferred temperature within the actual temperature range of the
potentiometer shall be chosen for this severity.
4.4 Resistance law
See 6.5.
4.5 Nominal total resistance
IEC 60393-1:2008, 2.3.2.
4.6 Tolerances on nominal total resistance
The preferred tolerances on nominal total resistance are:
±10 %, ±5 %, ±3 %, ±2 %, ±1 % and ±0,5 %.
4.7 Rated dissipation
The preferred values of rated dissipation at 70 °C, are:
0,1 W; 0,125 W; 0,25 W; 0,5 W; 0,75 W; 1 W; 1,5 W; 2,0 W; 2,5 W; 4 W; and 6,3 W.
The derated values of dissipation at temperatures in excess of 70 °C shall be as indicated by
the curve as shown in Figure 2.

– 10 – IEC 60393-3:2023 © IEC 2023

Figure 2 – Rated dissipation curve
A larger area of operation may be given in the detail specification, provided it includes all the
area given above. In this event the detail specification shall state the maximum allowable
dissipation at temperatures other than 70 °C. All break points on the curve shall be verified by
test.
An example of a derating curve having a larger area of operation is given in Figure 3.
In certain circumstances, the rated dissipation can continue up to the upper category
temperature.
Figure 3 – Rated dissipation curve (examples of lager area)
4.8 Limiting element voltage
The preferred values of DC or AC RMS limiting element voltage are taken from the R5 series
of preferred numbers of ISO 3:
100 V, 160 V, 250 V, 400 V, 630 V and 1 000 V.

IEC 60393-3:2023 © IEC 2023 – 11 –
4.9 Insulation voltage
The detail specification shall prescribe the value of the insulation voltage, rounded off to the
nearest 10 V. The numerical value of the insulation voltage shall be:
– normal air pressure: ≥ 1,42 times the limiting element voltage;
– low air pressure (at 8 kPa): ≥ two-thirds the value at normal air pressure.
4.10 Resolution (when applicable)
The resolution shall be stated in the detail specification.
5 Test and test severities
5.1 General
Test severities given in the detail specification should be selected from the content of 5.2 to
5.10.
5.2 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 bump or 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 that shall be used for the voltage proof and the insulation resistance tests
and for the application of the vibration and bump or shock tests. For the latter tests, the
mounting shall be such that there shall be no parasitic vibration.
5.3 Drying
IEC 60393-1:2008, 4.3, Procedure 1 shall be used.
5.4 Vibration
See IEC 60393-1:2008, 4.35, with the following details:
frequency range: 10 Hz to 55 Hz, or
10 Hz to 500 Hz, or
10 Hz to 2 000 Hz.
amplitude: 0,75 mm or acceleration 100 m/s (whichever is the less severe)
sweep endurance: total duration: 6 h
The detail specification shall prescribe the mounting method to be used (see 5.2).
5.5 Bump
See IEC 60393-1:2008, 4.36, with the following details:
acceleration: 400 m/s
number of bumps: 4 000 (total)
The detail specification shall prescribe the mounting method to be used (see 5.2).

– 12 – IEC 60393-3:2023 © IEC 2023
5.6 Shock
See IEC 60393-1:2008, 4.37, with the following details:
pulse shape: half-sine
2 2
acceleration: 300 m/s or 500 m/s
pulse duration: 11 ms
severity: 3 successive shocks to be applied in each of the three directions
(total 3 shocks)
The detail specification shall prescribe the mounting method to be used (see 5.2).
5.7 Solderability
5.7.1 Solder bath method (Method 1)
5.7.1.1 Test conditions, with Sn/Ag/Cu solder
See IEC 60393-1:2008, 4.32.2, with the following details:
solder alloy: Sn/Ag/Cu;
bath temperature: 245 °C ± 5 °C;
immersion time: 3 s ± 0,3 s.
5.7.1.2 Test conditions, with Sn/Pb solder
See IEC 60393-1:2008, 4.32.2, with the following details:
solder alloy: Sn/Pb;
bath temperature: 235 °C ± 5 °C;
immersion time: 2 s ± 0,5 s.
5.7.2 Soldering iron method (Method 2)
See IEC 60393-1:2008, 4.32.3, with the following details:
temperature of the soldering iron: 350 °C ± 10 °C (at start of test);
bit size: 3 mm (size B);
duration: 3 s.
5.8 Linearity
Linearity measurement shall be done by mounting of the device as in normal use and by moving
the rotating part by external actuation. The device shall be energized with a constant voltage
or current source of sufficient capacity within the maximum operating voltage. The number of
output measurements to be collected, shall be corresponding to each one of the minimum 100
equidistant points of the effective electrical angle.
5.9 Angle of effective travel
For non-wirewound potentiometers, the construction near the end terminals makes it difficult to
ascertain the exact angle of effective rotation. Therefore, the following definition shall be used.
Measurements of output are made from either end at very small steps of not more than 1 / 1 000
parts of the nominal angle of rotation. When the slope of 7 successive measuring points exceeds
75 % of the nominal value of the slope of the potentiometer, the first point of occurrence of
increasing slope is to be considered as the start point of the effective electrical angle. The
angular distance between these two rising and falling end points is the angle of effective
electrical travel.
IEC 60393-3:2023 © IEC 2023 – 13 –
5.10 Dither
The potentiometer shall be mounted in its normal position and orientation.
The dither test is carried out by moving the rotation part of the potentiometer with an actuating
device. The moving part is adjusted to approximately 50 % value. The rotation is made through
the angle ±0,5° to ±2,5° at 10 Hz to 25 Hz. The angle can be verified by the measurement of
the output voltage of the potentiometer. At the end of the test, the CRV and linearity should be
below 150 % of the initial value, but still comply with the nominal value.
6 Preferred characteristics
6.1 General
Test severities and requirements given in the detail specifications referring to this sectional
specification shall be of equal or superior performance level. Inferior performance levels are
not permitted.
The severities for the tests shall be stated in the detail specifications, following the prescriptions
of the generic specification IEC 60393-1 and Clause 5 of this sectional specification.
6.2 Temperature coefficients of resistance
The limits of change in resistance for the preferred temperature characteristic of resistance test
are given in Table 1.
Each line in Table 1 gives the preferred temperature coefficients and corresponding
temperature coefficients for 20 °C to 70 °C and limits of change in resistance for the
measurement of the temperature characteristics of resistance (see IEC 60393-1:2008, 4.14) on
the basis of the category temperature ranges of 4.3.
Different portions of the resistance range may be covered by different temperature 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.
Table 1 – Temperature coefficients
Temperature Limits of percentage change in resistance
coefficient of
resistance
−6
%
10 / K
Reference temperature / Reference temperature /
Lower category temperature Upper category temperature

°C °C
+20 / −55 +20 / −40 +20 / −10 +20 / +85 +20 / +100 +20 / +125
± 1 000 ± 7,5 ± 6 ± 3 ± 6,5 ± 8 ± 10,5
± 500 ± 3,75 ± 3 ± 1,5 ± 3,25 ± 4 ± 5,25
± 250 ± 1,88 ± 1,5 ± 0,75 ± 1,62 ± 2 ± 2,62
± 150 ± 1,15 ± 0,9 ± 0,45 ± 0,98 ± 1,2 ± 1,6
± 100 ± 0,75 ± 0,6 ± 0,3 ± 0,65 ± 0,8 ± 1,05
± 50 ± 0,375 ± 0,3 ± 0,15 ± 0,325 ± 0,4 ± 0,525
± 25 ± 0,188 ± 0,15 ± 0,075 ± 0,162 ± 0,2 ± 0,262
± 10 ± 0,075 ± 0,06 ± 0,03 ± 0,065 ± 0,08 ± 0,105

– 14 – IEC 60393-3:2023 © IEC 2023
6.3 Limits for change in resistance or output voltage ratio
The preferred combinations of limits for change in resistance or output voltage ratio in each of
the tests listed in the header row of Table 2 are as indicated in the lines of the table.
Table 2 – Limits for change in resistance or output voltage ratio
Stability 4.38 Climatic 4.34 Change of 4.30 Robustness of 4.22 Thrust 4.35
class sequence temperature terminals and pull on Vibration
shaft
%
4.39 Damp heat, 4.33 Resistance to 4.34
Change of
steady state soldering heat
temperature
4.40 Mechanical 4.35 Vibration
endurance
4.43.2 Electrical 4.36 Bump
endurance at 70 °C
4.43.3 Electrical 4.37 Shock
endurance at upper
category temperature
U U
ab ab
a a
b
∆ ∆
∆R between terminations a and c
U U
ac ac
10 ±(10 % R + 0,5 Ω) ±(3 % R + 0,1 Ω) ±(2 % R + 0,1 Ω) ±2 % ±2 %
5 ±(5 % R + 0,1 Ω) ±(2 % R + 0,1 Ω) ±(1 % R + 0,05 Ω) ±1 % ±1 %
3 ±(3 % R + 0,1 Ω) ±(2 % R + 0,1 Ω) ±(1 % R + 0,05 Ω) ±1 % ±1 %
2 ±(2 % R + 0,1 Ω) ±(1 % R + 0,1 Ω) ±(0,5 % R + 0,05 Ω) ±0,5 % ±0,5 %
1 ±(1 % R + 0,1 Ω) ±(0,5 % R + 0,05 Ω) ±(0,25 % R + 0,01 Ω) ±0,25 % ±0,25 %
The subclause numbers in the header row of the table refer to IEC 60393-1:2008.
U
ab
a
The change in the output voltage ratio ∆ shall be expressed in percent of the total applied voltage.
U
ac
b
∆R indicates the value of change in resistance.

6.4 Limits for insulation resistance
The preferred limits for insulation resistance shall be 1 GΩ minimum or, after humidity tests,
100 MΩ.
6.5 Limits for resistance law
The measuring points and associated values of the output voltage ratio for resistance laws shall
be stated in the detail specification. When requirements exist for forms of linearity, these shall
also be stated in the detail specification as shall any specified measuring points.
6.6 Solderability
See IEC 60393-1:2008, 4.32, with the following details:
The requirement for the visual inspection for the assessment of good solderability shall be ≥ 95 %
of the surface shall be covered with new solder. The new solder shall show no more than small
amounts of scattered imperfections, such as pinholes or non-wetted or dewetted areas. These
imperfections shall not be concentrated in one area.

IEC 60393-3:2023 © IEC 2023 – 15 –
7 Marking, packaging and ordering information
7.1 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) and degree of conformity;
d) detail specification and style reference;
e) year and month (or week) of manufacture;
f) details of shaft and bush (if not implicit in d) above). This may be in code form;
g) manufacturer's name and/or trademark;
h) manufacturer's type designation.
7.2 Marking for potentiometers
The potentiometer shall be clearly marked with a), b) and c) of 7.1 and with as many of the
remaining items as is practicable. Any duplication of information in the marking of the
potentiometer should be avoided.
7.3 Marking for packaging
The package containing the potentiometer(s) shall be clearly marked with all the information
listed of 7.1, and the following:
a) quantity
b) country origin
7.4 Additional marking
Any additional marking shall be so applied that no confusion can arise.
The detail specification shall specify the content of the marking on the potentiometer and on
the package. Deviations from 7.1 shall be specifically stated.
7.5 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;
d) shaft and bush dimensions, if not implicit in the style reference.

– 16 – IEC 60393-3:2023 © IEC 2023
8 Preferred values of ratings
8.1 General
Detail specifications shall be derived from the relevant blank detail specification.
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, as
shown in Figure 1.
Detail specifications shall not specify requirements inferior to those of the generic specification,
sectional specification or blank detail specification. When more severe requirements are
included, they shall be listed in a respective clause of the detail specification and indicated in
the test schedules, for example by a note.
The information requested in 8.2 to 8.4 shall be given in each detail specification and the
prescribed values shall be selected from those given in the appropriate clause of this sectional
specification.
8.2 Information to be specified in a detail specification
8.2.1 Outline drawing or illustration
There shall be an outline drawing or illustration of the potentiometer as an aid to easy
recognition and for comparison of the potentiometer with others.
8.2.2 Style and dimensions
See 4.2.
All dimensions and their associated tolerances, which affect interchangeability and mounting,
shall be given in the detail specification, using a dedicated outline and dimensions drawing.
8.3 Ratings and characteristics
8.3.1 General
The ratings and characteristics shall be in accordance with the relevant clauses of this
specification together with the content of 8.3.2.
8.3.2 Nominal total resistance range
See IEC 60393-1:2008, 2.3.2.
When products approved in accordance with 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/.
The qualified products list "QPL" style is given in the register of approvals, available for example
on the website stated above."
8.4 Additional information
The detail specification may include additional information (which is not normally required to be
verified by the inspection procedure), such as circuit diagrams, curves, drawings and notes
needed for the clarification of the detail specification.

IEC 60393-3:2023 © IEC 2023 – 17 –
9 Quality assessment procedures
9.1 General
See IEC 60393-1:2008, Clause H.1.
9.2 Definitions
9.2.1 Primary stage of manufacture
For potentiometers, the primary stage of the manufacture is:
– for wirewound types: the winding of the resistance wire (or ribbon) on the mandrel (insulation
or insulated);
– for non-wirewound types: the co-moulding with the conductive material and the substrate or
the deposition of the conductive material on the substrate;
conductive material: consists of appropriate binder vehicle carrying carbon and/or other
conductive material;
– for hybrid types: the coating of the conductive plastic material on the wirewound element.
A combination of two materials, usually consisting of a wirewound element with a coating of
conductive plastic material applied over the resistance wire where the moving contact makes
contact.
9.2.2 Structurally similar components
Potentiometers are considered as being structurally similar if they are produced with the same
or similar processes and materials, having the same style and construction and also the same
or similar sha
...