1、BRITISH STANDARD BSQC 410200:1992 IEC393-4: 1992 Harmonized system of quality assessment for electronic components Potentiometers for use in electronic equipment Sectional specification for single-turn rotary power potentiometersBSQC410200:1992 This British Standard, having been prepared under the d
2、irectionof the Electronic Components Standards PolicyCommittee, was publishedunder the authority ofthe Standards Board and comesinto effect on 15 July1992 BSI09-1999 The following BSI references relate to the work on this standard: Committee reference ECL/4 Draft announced in BSI News April1992 ISBN
3、 0 580 21004 9 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Electronic Components Standards Policy Committee (ECL/-) to Technical Committee ECL/4, upon which the following bodies were represented: EEA (the Association of the Electroni
4、cs, Telecommunications and Business Equipment Industries) Electronic Components Industry Federation Ministry of Defence National Supervising Inspectorate The following bodies were also represented in the drafting of the standard, through subcommittees and panels: BEAMA Ltd. ERA Technology Ltd. Amend
5、ments issued since publication Amd. No. Date CommentsBSQC410200:1992 BSI 09-1999 i Contents Page Committees responsible Inside front cover National foreword ii Section 1. General 1 General 1 1.1 Scope 1 1.2 Object 1 1.3 Related documents 1 1.4 Information to be given in a detail specification 1 1.5
6、Marking 3 Section 2. Preferred ratings, characteristics and test severities 2 Preferred ratings, characteristics and test severities 4 2.1 Preferred characteristics 4 2.2 Preferred values of ratings 5 2.3 Preferred test severities 6 Section 3. Quality assessment procedures 3 Quality assessment proce
7、dures 8 3.1 Structurally similar components 8 3.2 Qualification approval 8 3.3 Quality conformance inspection 18 3.4 Delayed delivery 19 Table I 4 Table II Test schedule for Qualification Approval 9 Table IIIA 18 Table IIIB 19 List of references Inside back coverBSQC410200:1992 ii BSI 09-1999 Nation
8、al foreword This British Standard has been prepared under the direction of the Electronic Components Standards Policy Committee. It is identical with IEC393-4:1992(QC410200) Potentiometers for use in electronic equipment Part4: Sectional specification: Single-turn rotary power potentiometers, publis
9、hed by the International Electrotechnical Commission (IEC) and is a harmonized specification within the IECQ system of quality assessment for electronic components. The standard is to be used in conjunction with BSQC410000:1990 Harmonized system of quality assessment for electronic components: poten
10、tiometers for use in electronic equipment. The Technical Committee has reviewed the provisions of IEC410 and QC001001 to which reference is made in the text and has decided that they are acceptable for use in conjunction with this standard. The British Standard which implements the IECQ Rules of Pro
11、cedure is BS9000General requirements for a system for electronic components of assessed quality Part3:1991 Specification for the national implementation of the IECQsystem. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are respon
12、sible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Cross-references International Standard Corresponding British Standard IEC63:1963 BS2488:1966 Schedule of preferred numbers for the resistance of resistors and the capac
13、itance of capacitors for telecommunications equipment (Technically equivalent) IEC68 BS2011 Environmental testing (All Parts identical or technically equivalent) IEC393-1:1988 BSQC410000:1990 Harmonized system of quality assessment for electronic components: potentiometers for use in electronic equi
14、pment (Identical) QC001002:1986 BSQC001002:1991 Rules of Procedure of the IECQuality Assessment System for Electronic Components (IECQ) (Identical) Summary of pages This document comprises a front cover, an inside front cover, pagesi andii, pages1 to20, an inside back cover and a back cover. This st
15、andard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.BSQC410200:1992 BSI 09-1999 1 Section 1. General 1 General 1.1 Scope This standard is applicable to single-turn rotary power potentiometers.
16、These potentiometers are primarily intended for use in electronic equipment. 1.2 Object The object of this standard is to prescribe preferred ratings and characteristics and to select from IECPublication393-1, appropriate Quality Assessment procedures, tests and measuring methods and to give general
17、 performance requirements for this type of potentiometer. Test severities and requirements prescribed in detail specifications referring to this sectional specification shall be of equal or higher performance level, lower performance levels are not permitted. 1.3 Related documents IEC Publications:
18、NOTEThe above references apply to the current editions except for IEC Publication68, for which the referenced edition in the applicable test clauses of the generic specification shall be used. 1.4 Information to be given in a detail specification Detail specifications shall be derived from the relev
19、ant blank detail specification. Detail specifications shall not specify requirements inferior to those of the generic, sectional or blank detail specification. When more severe requirements are included, they shall be listed in Sub-clause1.9 of the detail specification and indicated in the test-sche
20、dules, for example by an Asterisk. NOTEThe information given in Sub-clauses1.4.1 and1.4.3 may, for convenience, be presented in tabular form. The following information shall be given in each detail specification and the values quoted shall preferably be selected from those given in the appropriate c
21、lause of this sectional specification. 1.4.1 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 d
22、rawing forming an appendix to the detail specification. Publication63:1963 Preferred Number Series for Resistors and Capacitors. Amendment No.1(1967) Amendment No.2(1977) Publication68: Basic Environmental Testing Procedures. Publication393-1:1989 Potentiometers for Use in Electronic Equipment. Part
23、1: Generic Specification. Publication410:1973 Sampling Plans and Procedures for Inspection by Attributes. PublicationQC001001:1986 Basic Rules of the IEC Quality Assessment System for Electronic Component (IECQ). PublicationQC001002:1986 Rules of Procedure of the IEC Quality Assessment System for El
24、ectronic Components (IECQ).BSQC410200:1992 2 BSI 09-1999 The drawing shall give the following details: the dimensions of the spindle and bush. These may be given either on the outline drawing or by reference to IEC Publication915; any locating devices; the total mechanical travel; the effective elec
25、trical travel; the dimensions and the location of terminations; the dimensions which shall be measured in accordance with4.4.2 of IEC Publication393-1; any other dimensional information which will adequately describe the potentiometer. All dimensions shall preferably be stated inmm, however when the
26、 original dimensions are given in inches, the converted metric dimensions inmm shall be added. When the potentiometer is not designed for use on printed boards, this shall be clearly indicated in the detail specification. 1.4.2 Mounting The detail specification shall specify the method of mounting t
27、o be applied for the voltage proof and the insulation resistance tests and for the application of the vibration and bump or shock tests. Thepotentiometers shall be mounted by their normal means, but the design may be such that special mounting fixtures are required. In this case the detail specifica
28、tion 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 bump or shock tests. For the latter tests the mounting shall be such that there shall be no parasitic vibration. 1.4.3 Style (IEC Pu
29、blication393-1, Sub-clause2.2.3) The style shall be presented by a double-letter code e.g.AB, which is arbitrary chosen for each detail specification. The style designation, therefore, has no meaning unless the number of the detail specification is also given. 1.4.4 Resistance law SeeSub-clause2.1.5
30、. 1.4.5 Ratings and characteristics The ratings and characteristics shall be in accordance with the relevant clauses of this specification together with the following: 1.4.5.1 Rated resistance range SeeSub-clause2.2.1 The preferred values are those of the E-series of IEC Publication63. NOTEWhen prod
31、ucts approved 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 Qualified Products List”.BSQC410200:1992 BSI 09-1999 3 1.4.5.2 Bump and shock The bump and shock tests are considered to be alternati
32、ves. The detail specification shall indicate which test has been selected. 1.4.6 Marking The detail specification shall specify the content of the marking on the potentiometer and on the package. Deviations from Sub-clause1.5 of this sectional specification shall be specifically stated. 1.4.7 Orderi
33、ng information The detail specification shall indicate that the following information, in clear or in coded form, is required when ordering: 1) Rated resistance and tolerance on rated resistance. 2) Resistance law (if other than linear). 3) Number and issue reference of the detail specification and
34、style reference. 4) Spindle and bush dimensions, if not implicit in the style reference. 1.4.8 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, d
35、rawings and notes needed for the clarification of the detail specification. 1.5 Marking 1.5.1 General 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) rated resistance; b) tolerance on
36、 rated resistance; c) resistance law (if other than linear); d) rated dissipation; e) detail specification and style reference; f) year and month (or week) of manufacture; g) details of spindle and bush if not implicit ine) above. This may be in code form; h) manufacturers name and trademark. 1.5.2
37、The potentiometer shall be clearly marked witha),b) andd) above and with as many of the remaining items as is practicable. Any duplication of information in the marking of the potentiometer should be avoided. 1.5.3 The package containing the potentiometer(s) shall be clearly marked with all the info
38、rmation listedabove. 1.5.4 Any additional marking shall be so applied that no confusion can arise.BSQC410200:1992 4 BSI 09-1999 Section 2. Preferred ratings, characteristics and test severities 2 Preferred ratings, characteristics and test severities 2.1 Preferred characteristics The values given in
39、 the detail specification shall preferably be selected from the following: 2.1.1 Preferred climatic categories The potentiometers covered by this specification are classified into climatic categories according to the general rules given in IEC Publication68-1. The lower and upper category temperatur
40、e and the duration of the damp heat, steady state test shall be chosen from the following: Duration of the damp heat, steady state test:4,10,21 and56days. The severities for the cold and dry heat tests are the lower and upper category temperatures respectively. Because of the construction of some po
41、tentiometers these temperatures will occur between two of the preferred temperatures given in IEC Publication68-2. In this case the nearest preferred temperature within the actual temperature range of the potentiometer shall be chosen for this severity. 2.1.2 Temperature coefficients and temperature
42、 characteristics of resistance The measurement of temperature coefficient, or temperature characteristics of resistance is not applicable to this type of potentiometer. 2.1.3 Limits for change in resistance or output ratio The preferred combinations of limits for change in resistance or output ratio
43、 in each of the tests listed in the heading of the following table are as indicated in the lines of the table. NOTEThe sub-clause numbers in the heading of the table refer to IEC Publication393-1. Table I Lower category temperature: 65 C,55 C,40 C,25 C, and10 C Upper category temperature: +70 C,+85
44、C,+100 C,+125 C,+155 C,+175 C, and+200 C Stability class in % 4.38 Climatic sequence 4.39 Damp heat, steady state 4.40 Mechanical endurance 4.43.1 Electrical endurance at room temperature 4.43.3 Electrical endurance at upper category temperature 4.43 Electrical endurance at temperatures other than70
45、 C 4.30 Robustness of terminations 4.33 Resistance to soldering heat 4.34 Change of temperature 4.35 Vibration 4.36 Bump 4.37 Shock 4.22 Thrust and pull on spindle 4.34 Change of temperature 4.35 Vibration (ifapplicable, seeNote2) %R/R between terminations a and c (seenote1) (seenote1) 10 5 3 (10%+0
46、,57) (5%+0,17) (3%+0,17) (5%+0,17) (2%+0,17) (1%+0,057) 5% 2% 1% 5% 5% 3% NOTE 1The change in the output voltage ratio shall be expressed in percent of the total applied voltage. NOTE 2For potentiometers with locking devices, the limit of change shall be2%.BSQC410200:1992 BSI 09-1999 5 2.1.4 Limits
47、for insulation resistance The preferred limits for insulation resistance shall be1G7 minimum or, after humidity tests,100M7. 2.1.5 Limits for resistance law The preferred measuring points and associated values of the output ratio for resistance laws are: 2.2 Preferred values of ratings The values gi
48、ven in detail specifications shall preferably be selected from the following: 2.2.1 Rated resistance IEC Publication393-1, Sub-clause2.3.2. 2.2.2 Tolerances on rated resistance The preferred tolerances on rated resistance are: 20%, 10% and 5%. 2.2.3 Rated dissipation The preferred values of rated di
49、ssipation at70 C, are: 10W,16W,25W,40W,50W,63W,80W,100W,125W,160W,250W,315W,400W,500W,630W, 800Wand1000W. The derated values of dissipation at temperatures in excess of70 C shall be as indicated by the following 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 than70 C. All break points on the curve shall be verified by test. Re
