Potentiometers for use in electronic equipment - Part 3: Sectional specification: Rotary precision potentiometers

This part of IEC 60393 applies to rotary precision potentiometers for use in electronic equipment. The object of this standard 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 standard gives the minimum performance requirements and test severities.

Potentiometer zur Verwendung in Geräten der Elektronik – Teil 3: Rahmenspezifikation: Drehpräzisionspotentiometer

Potentiomètres utilisés dans les équipements électroniques - Partie 3: Spécification intermédiaire: Potentiomètres de précision rotatifs

Potenciometri za elektronsko opremo - 3. del: Področna specifikacija: natančni rotacijski potenciometri

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Current Stage
4020 - Enquiry circulated
Due Date
18-Mar-2022
Completion Date
18-Mar-2022

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SLOVENSKI STANDARD
oSIST prEN IEC 60393-3:2022
01-maj-2022
Potenciometri za elektronsko opremo - 3. del: Področna specifikacija: natančni
rotacijski potenciometri

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
Ta slovenski standard je istoveten z: prEN IEC 60393-3:2022
ICS:
31.040.20 Potenciometri, spremenljivi Potentiometers, variable
upori resistors
oSIST prEN IEC 60393-3:2022 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN IEC 60393-3:2022
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oSIST prEN IEC 60393-3:2022
40/2924/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 60393-3 ED3
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2022-03-18 2022-06-10
SUPERSEDES DOCUMENTS:
40/2867/CD, 40/2900/CC
IEC TC 40 : CAPACITORS AND RESISTORS FOR ELECTRONIC EQUIPMENT
SECRETARIAT: SECRETARY:
Netherlands Mr Ronald Drenthen
OF INTEREST TO THE FOLLOWING COMMITTEES: PROPOSED HORIZONTAL STANDARD:
Other TC/SCs are requested to indicate their interest, if any,
in this CDV to the secretary.
FUNCTIONS CONCERNED:
EMC ENVIRONMENT QUALITY ASSURANCE SAFETY

SUBMITTED FOR CENELEC PARALLEL VOTING NOT SUBMITTED FOR CENELEC PARALLEL VOTING

Attention IEC-CENELEC parallel voting
The attention of IEC National Committees, members of
CENELEC, is drawn to the fact that this Committee Draft for
Vote (CDV) is submitted for parallel voting.
The CENELEC members are invited to vote through the
CENELEC online voting system.

This document is still under study and subject to change. It should not be used for reference purposes.

Recipients of this document are invited to submit, with their comments, notification of any relevant patent rights of which

they are aware and to provide supporting documentation.
TITLE:

Potentiometers for use in electronic equipment - Part 3: Sectional specification: Rotary precision

potentiometers
PROPOSED STABILITY DATE: 2028
NOTE FROM TC/SC OFFICERS:

Copyright © 2022 International Electrotechnical Commission, IEC. All rights reserved. It is permitted to download this

electronic file, to make a copy and to print out the content for the sole purpose of preparing National Committee positions.

You may not copy or "mirror" the file or printed version of the document, or any part of it, for any other purpose without

permission in writing from IEC.
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oSIST prEN IEC 60393-3:2022
60393-3/Ed3/CDV  IEC (E) – 2 – 40/2924/CDV
1 CONTENTS

3 FOREWORD ........................................................................................................................... 4

4 1 Scope .............................................................................................................................. 6

5 2 Normative references ...................................................................................................... 6

6 3 Terms and definitions ...................................................................................................... 6

7 4 Preferred characteristics .................................................................................................. 7

8 4.1 General ................................................................................................................... 7

9 4.2 Style and dimensions .............................................................................................. 7

10 4.2.1 Style ................................................................................................................ 7

11 4.2.2 Outline drawing and dimensions ...................................................................... 7

12 4.3 Preferred climatic categories................................................................................... 8

13 4.4 Resistance law........................................................................................................ 9

14 4.5 Nominal total resistance .......................................................................................... 9

15 4.6 Tolerances on nominal total resistance ................................................................... 9

16 4.7 Rated dissipation .................................................................................................... 9

17 4.8 Limiting element voltage ....................................................................................... 10

18 4.9 Insulation voltage .................................................................................................. 10

19 4.10 Resolution (when applicable) ................................................................................ 10

20 5 Test and test severities ................................................................................................. 10

21 5.1 General ................................................................................................................. 10

22 5.2 Mounting ............................................................................................................... 10

23 5.3 Drying ................................................................................................................... 11

24 5.4 Vibration ............................................................................................................... 11

25 5.5 Bump .................................................................................................................... 11

26 5.6 Shock ................................................................................................................... 11

27 5.7 Solderability .......................................................................................................... 11

28 5.7.1 Solder bath method (Method 1)...................................................................... 11

29 5.7.2 Soldering iron method (Method 2) .................................................................. 12

30 5.8 Linearity ................................................................................................................ 12

31 5.9 Angle of effective travel ........................................................................................ 12

32 5.10 Dither .................................................................................................................... 12

33 6 Preferred characteristics ................................................................................................ 12

34 6.1 General ................................................................................................................. 12

35 6.2 Temperature coefficients and temperature characteristics of resistance ................ 13

36 6.3 Limits for change in resistance or output voltage ratio ........................................... 13

37 6.4 Limits for insulation resistance .............................................................................. 14

38 6.5 Limits for resistance law ....................................................................................... 14

39 6.6 Solderability .......................................................................................................... 14

40 7 Marking, packaging and ordering information ................................................................. 15

41 7.1 General ................................................................................................................. 15

42 7.2 Marking for potentiometers ................................................................................... 15

43 7.3 Marking for packaging ........................................................................................... 15

44 7.4 Additional marking ................................................................................................ 15

45 7.5 Ordering information ............................................................................................. 15

46 8 Preferred values of ratings ............................................................................................ 15

47 8.1 General ................................................................................................................. 15

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48 8.2 Information to be specified in a detail specification ............................................... 16

49 8.2.1 Outline drawing or illustration ........................................................................ 16

50 8.2.2 Style and dimensions ..................................................................................... 16

51 8.3 Ratings and characteristics ................................................................................... 16

52 8.3.1 General ......................................................................................................... 16

53 8.3.2 Nominal total resistance range ...................................................................... 16

54 8.4 Additional information ........................................................................................... 16

55 9 Quality assessment procedures ..................................................................................... 16

56 9.1 General ................................................................................................................. 16

57 9.2 Definitions ............................................................................................................ 17

58 9.2.1 Primary stage of manufacture ........................................................................ 17

59 9.2.2 Structurally similar components ..................................................................... 17

60 9.3 Assessment level EZ............................................................................................. 17

61 10 Qualification approval .................................................................................................... 17

62 10.1 General ................................................................................................................. 17

63 10.2 Qualification approval on the basis of the fixed sample size procedure

64 Sampling .............................................................................................................. 17

65 10.3 Tests .................................................................................................................... 18

66 11 Quality Conformance Inspection .................................................................................... 31

67 11.1 Formation of inspection lots .................................................................................. 31

68 11.2 Test schedule ....................................................................................................... 31

69 11.3 Assessment levels ................................................................................................ 31

70 11.4 Delayed delivery ................................................................................................... 33

71 Annex A (normative) Symbols and abbreviated terms ......................................................... 34

72 A.1 Symbols ................................................................................................................ 34

73 A.2 Abbreviated terms ................................................................................................. 35

74 Annex B (normative) Apparatus for measuring mechanical accuracy .................................. 36

75 B.1 Dial indicator ......................................................................................................... 36

76 B.2 Cylindrical shaft adaptor ....................................................................................... 36

77 B.3 Potentiometer mounting fixture ............................................................................. 36

78 B.4 Potentiometer shaft holding fixture ........................................................................ 36

79 Bibliography .......................................................................................................................... 37

81 Figure 1 – Outline drawing and dimensions ............................................................................. 8

82 Figure 2 – Rated dissipation curve .......................................................................................... 9

83 Figure 3 – Rated dissipation curve (examples of lager area) ................................................. 10

85 Table 1 – Temperature coefficients and temperature characteristics of resistance ................ 13

86 Table 2 – Limits for change in resistance or output voltage ratio ........................................... 14

87 Table 3 – Test schedule for qualification approval................................................................. 19

88 Table 4 – Quality conformance inspection: Lot-by-lot inspection ........................................... 32

89 Table 5 – Quality conformance inspection: Periodic testing ................................................... 33

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oSIST prEN IEC 60393-3:2022
60393-3/Ed3/CDV  IEC (E) – 4 – 40/2924/CDV
93 INTERNATIONAL ELECTROTECHNICAL COMMISSION
94 ____________
96 POTENTIOMETERS FOR USE IN ELECTRONIC EQUIPMENT –
98 Part 3: Sectional specification:
99 Rotary precision potentiometers
100
101 FOREWORD

102 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising

103 all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international

104 co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and

105 in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,

106 Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their

107 preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with

108 may participate in this preparatory work. International, governmental and non-governmental organizations liaising

109 with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for

110 Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.

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

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

113 interested IEC National Committees.

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

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

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

117 misinterpretation by any end user.

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

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

120 any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.

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

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

123 services carried out by independent certification bodies.

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

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

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

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

128 expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications.

129 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is

130 indispensable for the correct application of this publication.

131 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent

132 rights. IEC shall not be held responsible for identifying any or all such patent rights.

133 International Standard IEC 60393-3 has been prepared by IEC technical committee 40:

134 Capacitors and resistors for electronic equipment.

135 This third edition cancels and replaces the second edition published in 1992 and constitutes a

136 technical revision.

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

138 edition:

139 a) revised all parts of the document based on the ISO/IEC Directives, Part 2:2018 (eighth

140 edition) and harmonized with other similar kinds of documents.

141 b) The document structure has been organized to follow new sectional specification structure

142 decided in TC 40

143 c) revision of the information on the assessment level EZ (zero nonconforming);

144 The text of this International Standard is based on the following documents:
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oSIST prEN IEC 60393-3:2022
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FDIS Report on voting
40/XX/FDIS 40/XX/RVD
145

146 Full information on the voting for the approval of this International Standard can be found in the

147 report on voting indicated in the above table.

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

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

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

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

152 stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to

153 the specific document. At this date, the document will be
154 • reconfirmed,
155 • withdrawn,
156 • replaced by a revised edition, or
157 • amended.
158
159
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oSIST prEN IEC 60393-3:2022
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160 POTENTIOMETERS FOR USE IN ELECTRONIC EQUIPMENT –
161
162 Part 3: Sectional specification:
163 Rotary precision potentiometers
164
165
166
167 1 Scope

168 This part of IEC 60393 applies to rotary precision potentiometers for use in electronic equipment.

169 The object of this standard is to prescribe preferred ratings and characteristics and to select

170 from IEC 60393-1, the appropriate quality assessment procedures, tests and measuring

171 methods and to give general performance requirements for this type of potentiometer.

172 This standard gives the minimum performance requirements and test severities.

173 2 Normative references

174 The following documents are referred to in the text in such a way that some or all of their content

175 constitutes requirements of this document. For dated references, only the edition cited applies.

176 For undated references, the latest edition of the referenced document (including any

177 amendments) applies.
178 IEC 60062, Marking codes for resistors and capacitors
179 IEC 60068-1:2013, Environmental testing – Part 1: General and guidance
180 IEC 60068-2-1, Environmental testing – Part 2-1: Tests – Test A: Cold
181 IEC 60068-2-2, Environmental testing – Part 2-2: Tests – Test B: Dry heat

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

183 IEC 60915, Capacitors and resistors for use in electronic equipment – Preferred dimensions of shaft

184 ends, bushes and for the mounting of single-hole, bush-mounted, shaft-operated electronic components

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

186 inspection of electronic components and packages
187 3 Terms and definitions

188 For the purposes of this document, the terms and definitions of IEC 60393-1:2008, and the

189 following apply.

190 ISO and IEC maintain terminological databases for use in standardization at the following

191 addresses:
192 • IEC Electropedia: available at http://www.electropedia.org/
193 • ISO Online browsing platform: available at http://www.iso.org/obp
194
195
196
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197 4 Preferred characteristics
198 4.1 General

199 The values given in detail specifications shall preferably be selected from the following.

200 4.2 Style and dimensions
201 4.2.1 Style
202 See IEC 60393-1:2008, 2.2.2.

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

204 each detail specification.

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

206 is also given.
207 4.2.2 Outline drawing and dimensions

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

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

210 such dimensions shall appear on a drawing forming an annex to the detail specification, as

211 shown in Figure 1.
212
213
214
215
216
217
Style code: BM
Style code: HS
218
219
220
221
222
Style code: PM-RT
Style code: PM-ST
223
224 Key:
225 A Body wide or diameter
226 B Body height
227 C Body length
228 D Shaft diameter
229 E Bushing diameter or thread size
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230 F Bushing length
231 G Distance from the mounting surface to the terminal center
232 H Distance from shaft center to the board surface
233 J Distance from mounting surface to terminal board
234 K Distance from shaft center to terminal tip
235 L Shaft length
236 M Pitch circle diameter of terminals
237 P Distance between terminals
238 T Terminal diameter
239 T Terminal length
240 T Terminal thickness
241 T Terminal width
242 θ Terminal mounting angle
243
244 Figure 1 – Outline drawing and dimensions
245 The drawing shall give the following details:

246 – the dimensions of the shaft and bush. These may be given either on the outline drawing or by

247 reference to IEC 60915;
248 – any locating devices;
249 – the total mechanical travel;
250 – the effective electrical travel;
251 – the angle of ineffective mechanical travel;
252 – the dimensions and the location of terminals;

253 – the dimensions which shall be measured in accordance with IEC 60393-1:2008, 4.4.2;

254 – any other dimensional information which will adequately describe the potentiometer.

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

256 are given in inches, the converted metric dimensions in millimetres shall be added.

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

258 in the detail specification.
259 4.3 Preferred climatic categories

260 The potentiometers covered by this specification are classified into climatic categories

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

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

263 shall be chosen from the following:
264 Lower category temperature: -55 °C, -40 °C and -10 °C.
265 Upper category temperature: +85 °C, +100 °C and +125 °C.
266 Duration of the damp heat, steady state test: 21 and 56 days.

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

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

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

270 2:2007. In this case the nearest preferred temperature within the actual temperature range of

271 the potentiometer shall be chosen for this severity.
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oSIST prEN IEC 60393-3:2022
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272 4.4 Resistance law
273 See 6.5.
274 4.5 Nominal total resistance
275 IEC 60393-1:2008, 2.3.2.
276 4.6 Tolerances on nominal total resistance
277 The preferred tolerances on nominal total resistance are:
278 ± 10 %, ± 5 %, ± 3 %, ± 2 %, ± 1% and ± 0,5 %.
279 4.7 Rated dissipation
280 The preferred values of rated dissipation at 70 °C, are:

281 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.

282 The derated values of dissipation at temperatures in excess of 70 °C shall be as indicated by

283 the curve as shown in Figure 2.
284
100
Percentage of the
Area of recommended
rated dissipation
operation
Lower category +70 °C Upper category
temperature temperature
285 Figure 2 – Rated dissipation curve

286 A larger area of operation may be given in the detail specification, provided it includes all the

287 area given above. In this event the detail specification shall state the maximum allowable

288 dissipation at temperatures other than 70 °C. All break points on the curve shall be verified by

289 test.

290 An example of a derating curve having a larger area of operation is given in Figure 3.

291 In certain circumstances, the rated dissipation may continue up to the upper category

292 temperature.
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293
100
Percentage of the
rated dissipation
+70 °C
Lower category Upper category
temperature temperature
294
295 Figure 3 – Rated dissipation curve (examples of lager area)
296 4.8 Limiting element voltage

297 The preferred values of DC or AC RMS limiting element voltage are taken from the R5 series

298 of preferred numbers of ISO 3:
299 100 V, 160 V, 250 V, 400 V, 630 V and 1 000 V.
300 4.9 Insulation voltage

301 The detail specification shall prescribe the value of the insulation voltage, rounded off to the

302 nearest 10 V. The numerical value of the insulation voltage shall be:
303 – Normal air pressure: ≥ 1,42 times the limiting element voltage
304 – Low air pressure (at 8 kPa): ≥ two-thirds the value at normal air pressure
305 4.10 Resolution (when applicable)
306 The resolution shall be stated in the detail specification.
307
308 5 Test and test severities
309 5.1 General

310 Test severities given in the detail specification shall preferably be selected from the following.

311 5.2 Mounting

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

313 and the insulation resistance tests and for the application of the vibration and bump or shock

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

315 that special mounting fixtures are required. In this case, the detail specification shall describe

316 the mounting fixtures that shall be used for the voltage proof and the insulation resistance tests

317 and for the application of the vibration and bump or shock tests. For the latter tests the mounting

318 shall be such that there shall be no parasitic vibration.
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319 5.3 Drying
320 See IEC 60393-1:2008, 4.3, Procedure 1 shall be used.
321 5.4 Vibration
322 See IEC 60393-1:2008, 4.35, with the following details:
323 Frequency range: 10 Hz to 55 Hz, or
324 10 Hz to 500 Hz, or
325 10 Hz to 2 000 Hz.
326 Amplitude: 0,75 mm or acceleration 100 m/s (whichever is the less severe)
327 Sweep endurance: Total duration: 6 h

328 The detail specification shall prescribe the mounting method to be used. (See 5.2)

329 5.5 Bump
330 See IEC 60393-1:2008, 4.36, with the following details:
331 Acceleration: 400 m/s
332 Number of bumps: 4 000 (total)

333 The detail specification shall prescribe the mounting method to be used. (See 5.2)

334 5.6 Shock
335 IEC 60393-1:2008, 4.37, with the following details:
336 Pulse shape: Half-sine
2 2
337 Acceleration: 300 m/s or 500 m/s
338 Pulse duration: 11 ms

339 Severity: 3 successive shocks to be applied in each of the three directions (total 3

340 shocks)

341 The detail specification shall prescribe the mounting method to be used. (See 5.2)

342 5.7 Solderability
343 5.7.1 Solder bath method (Method 1)
344 5.7.1.1 Test conditions, with Sn/Ag/Cu solder
345 See IEC 60393-1:2008, 4.32.2, with the following details:
346 Solder alloy: Sn/Ag/Cu;
347 Bath temperature: 245 ± 5 °C;
348 Immersion time: 3 ± 0,3 s.
349 5.7.1.2 Test conditions, with Sn/Pb solder
350 See IEC 60393-1:2008, 4.32.2, with the fol
...

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