ECA 4980000-A-1989 Generic Specification for Keyboard Switches of Certified Quality.pdf

1、- EIA 4980000-A 89 = 3234b00 007L8Lq 2 1 %=- - P a I O O O O a) Q, t * 0 W ANSI/ EIA-4980000-A-1989 APPROVED: May 10, 1989 EIA SPECIFICATION Generic Specif cation for Keyboard Switches f Certifed Quality EIA-4980000-A MAY 1089 ELECTRONIC INDUSTRIES ASSOCIATION ENGINEERING DEPARTMENT Approved For Use

2、 in The NECQ Svstem NOTICE EIA Engineering Standards and Publications are designed to serve the public interest through eliminating misunderstandings between manufacturers and purchasers, facilitating interchangeability and improvement of products, and assisting the purchaser in selecting and obtain

3、ing with minimum delay the proper product for his particular need. Existence of such Standards and Publications shall not in any respect preclude any member or non-member of EIA from manufacturing or selling products not conforming to such Standards and Publications, nor shall the existence of such

4、Standards and Publications preclude their voluntary use by those other than EIA members, whether the standard is to be used either domestically or internationally. Recommended Standards and Publications are adopted by EIA without regard to whether or not their adoption may involve patents on article

5、s, materials, or processes. By such action, EIA does not assume any liability to any patent owner, nor does it assume any obligation whatever to parties adopting the Recommended Standard or Publication. This EIA Specification is considered to have International Standardization implication, but the I

6、nternational Electrotechnical Commission activity has not progressed to the point where a valid comparison between the EIA Standard and the IEC document can be made. This Specification does not purport to address all safety problems associated with its use or all applicable regulatory requirements.

7、It is the responsibility of the user of this Standard to establish appropriate safety and health practices and to determine the applicability of regulatory limitations before its use. Published by Copyright 1989 ELECTRONIC INDUSTRIES ASSOCIATION Engineering Department 1722 Eye Street Washington, D.C

8、. 20006 8 PRICE: $16.00 All Rights Reserved Printed in U.S.A. EIA 498OOO-A 9 M 3234600 007LLb b M EIA-4980000-A Page 1 GENERIC SPECIFICATION FOR KEYBOARD SWITCHES OF CERTIFIED QUALITY (From EIA Standards Proposal No. 2207, formulated under the cognizance of the EIA P-13.3 Working Group on Sensitive,

9、 Pushbutton and Keyboard Switches.) 1.0 SCOPE AND OBJECT 1.1 Scope This Generic Specification relates to keyswitches, keypads, and keyboard switches of certified quality. Switches covered by this Specification provide manual interface with electronic logic circuits in commercial, industrial, militar

10、y, and computer information handling equipment. Sectional Specifications, based upon this Generic Specification, shall describe the individual types of switches. Blank Detail Specifications, based upon the relevant Sectional Specification, shall describe the requirements for preparing a Detail Speci

11、fication on a switch or on a group of structurally similar switches. In lieu of Blank Detail Specifications, the Sectional Specification may provide instructions for preparation of Detail Specifications. 1.2 Object The object of this Generic Specification is to establish a uniform quality certificat

12、ion system, a uniform qualification test sequence, a minimum group of tests for qualification or capability approval inspection, and to provide for consistency in the Sectional Specification for keyboard switches. 2.0 GENERAL 2.1 Related Documents The following documents of the issue in effect form

13、a part of this Specification to the extent specified herein. IEC 410 Sampling Plans and Procedures for Inspection by Attributes ., EIA 4980000-A 89 W 3234b00 007LL7 8 W f EIA-4980000-A Page 2 2.2 IEC 664 IS0 1000 IECQ QC 001002 ANSI/EIA-186 ANSI/EIA-4 4 8 ANSI/EIA-476 ANSI/UL 94 Insulation Coordinat

14、ion Within Low-Voltage Systems SI Units and Recommendations for Use of Their Multiples and of Certain Other Units Rule of Procedure of the IEC Quality Assessment System for Electronic Components (IECQ) Standard Test Methods for Passive Electronic Component Parts Standard Test Method for Electro- mec

15、hanical Switches Marking, Source and Date Code Tests for Flammability of Plastic Materials for Parts in Devices and Appliances ANSI/UL 114 Safety Standards for Office Appliances and Business Machines ANSI/UL 478 Safety Standards for Electronic FED-STD-28 Screw-Thread Standards for Federal Data-Proce

16、ssing Units and Systems Services FED-STD-595 Colors MIL-STD-105 Units and Symbols Sampling Procedures and Tables for Inspection by Attributes Units, graphic symbols, and letter symbols shall be, whenever possible, in accordance with the issue in effect of the following publications: IS0 1000 SI Unit

17、s and Recommendations for the Use of Their Multiple and Certain Other Units ANSI/IEEE Y32E Electrical and Electronic Graphic Symbols and Reference Designations EIA 4980000-A 89 m 3234600 007L8L8 T m 1 EIA-4980000-A Page 3 Graphic symbols and letter symbols peculiar to a group of structurally similar

18、 switches shall be defined in the Detail Specification. 2.3 Terminology Terminology shall be in accordance with the issue in effect of the following publication: ANSI/IEEE 100 Dictionary of Electrical and Elec- tronics Terms Terminology peculiar to a particular switch subfamily shall be defined in t

19、he applicable Sectional Specification. Terminology common to all keyboard switches is defined in Appendix A. Terminology peculiar to a group of structurally similar switches shall be defined in the Detail Specification. 2.4 Standard and Preferred Values The Sectional or Blank Detail Specification ma

20、y prescribe any standard values or any preferred values for rated and limiting values, characteristics, tolerances, requirements and dimensions applicable to the whole subfamily. 2.4.1 Clearance and Creepage Distances The Sectional or Detail Specification shall specify either the minimum clearance a

21、nd creepage distances or the minimum dielectric test voltage under specified air pressure. The acceptability of a switch for a particular application can then be determined based upon the safety requirements which apply to the equipment in which the switch is installed and upon IEC Publication 664.

22、When minimum clearance and creepage distances are specified, the applicable Material Group of IEC Publication 664 shall also be specified for the insulation materials of the switch. 2.5 Marking The Sectional Specification shall. indicate the iden- tification criteria and other information to be show

23、n on the switch and/or package containing the switch. EIA 4980000-A 89 W 3234b00 OOII8L II W EIA-4980000-A Page 4 2.6 Design Requirements 2.6.1 “Materials 2.6.2 2.6.3 Materials shall be capable of meeting the performance requirements specified by the Detail Specification. Printed circuit board mater

24、ial shall also comply with ANSI/UL 114 or ANSI/478 as applicable. Plastic materials shall also be listed for flammability under UL 94 as specified in the Detail Specification. Metals for noncurrent- carrying parts shall be corrosion resistant or shall be suitably protected to resist corrosion. Finis

25、hes No requirement at present. Threads Threads for removable parts shall be in accordance with FED-STD-28. The unified series of threads is preferred. 2.6.4 Electrical Shock Protection Keyboards shall be designed in a manner such that the keyboard will comply with ANSI/UL 114 or ANSI/UL 478, as appl

26、icable, when properly installed in its enclosure. 2.6.5 Maintenance Switches should be designed to facilitate repair or replacement, as applicable, using standard tools such as screwdrivers, nut drivers, soldering tools, etc. Special tools, when required, shall be specified by the Detail Specificati

27、on. 2.6.6 Keytop Color The color for non-illuminated keytop background and legend colors should be selected from FED-STD-595, whenever possible, and specified by the Detail Specification. The color of the illuminated keytops shall be specified by the Detail Specification. EIA 4980000-A 89 m 3234600

28、0071820 8 m EIA-4980000-A Page 5 3.0 QUALITY ASSESSMENT PROCEDURES 3.1 Product or Capability Approval Procedures The manufacturer shall contact the National Supervising Inspectorate for specific instructions on obtaining qualification approval. Qualification approval shall be granted upon satisfacto

29、ry completion of the inspections prescribed for qualification approval and upon satisfactory fulfillment of the instructions of the National Supervising Inspectorate. These inspections shall consist of a fixed sample quantity subjected to the specified sequence of test. The test samples shall be dra

30、wn from current production or as agreed with the National supervising Inspectorate. The manufacturer shall comply with: a) The general requirements of the rules of procedure governing qualification approval. b) The requirements for the primary stage of manufacture. 3.1.1 Qualification Inspection Tes

31、ts The tests required for qualification inspection are prescribed in Table 1. The minimum qualification inspection for any switch shall be the Group P (Test Phase P1 thru P4) and Test Group A (all Test Phases). Any of the other test groups (B through G) may be prescribed by the relevant specificatio

32、n. When the additional tests groups are prescribed, the identity of the test group, the sequence of the tests, and the minimum sample quantity shall be in accordance with Table 1. When the relevant specification prescribes tests not in Table 1, the relevant specification shall include the additional

33、 tests either within an existing test group(s) or as an additional test group(s). In the event qualification is sought on a variant of a previously qualified switch, qualification inspection shall be limited to those tests for which the test results on the previously qualified switch are not valid f

34、or the variant. EIA-4980000-A Page 6 3.1.2 3.1.3 3.1.4 3.1.5 3.1.6 3.2 Primary Test Specimens The minimum number of test specimens shall be in accordance with Table 1. The test specimens shall be representative of the type(s) for which qualification is sought. See clause 3.3. Test specimens shall no

35、t be included in lots released for delivery. Extent of Qualification Approval Qualification approval may be granted for all switches which are structurally similar to the qualification test specimens or, in the case of capability approval, qualification approval will be granted for the range of prod

36、ucts described in the Detail Capability Approval Specification. Maintenance of Qualification Approval The requirements of IECQ QC 001002 apply. Suspension or Withdrawal of Qualification Approval The requirements of IECQ QC 001002 apply. Significant Changes The manufacturer shall report to the Nation

37、al Supervising Inspectorateanytechnicalmodifications which could adversely affect the results of the qualification inspection tests. Technical modifications include changes in design, material, technology, manufacturing procedures and/or manufacturing location. Stage of Manufacture The primary stage

38、 of manufacture and all subsequent processes shall be carried out under the direct surveillance of the manufacturers approved chief inspector. They may be carried out by subcontractors providing equivalent disciplines apply, unless otherwise specified by the Sectional or Detail Specification. The pr

39、imary stage of manufacture shall be defined in the Sectional Specification. EIA 4980000-A 89 m 3234600 0073822 L m EIA-4980000-A Page 7 3.3 Structurally Similar Switches Structurally similar switches for product qualification detail specifications are switches produced by the same manufacturer with

40、essentially the same design, materials, processes and methods. They are such that the results of a given test carried out on one type of these switches can be recognized as being valid for other types of the group. They are separately identifiable. Structurally similar switches for capability approv

41、al specifications are switches produced by the same manufacturer with essentially the same design, materials, processes and methods, and which are within the range of products described in the “Detail Capability Approval Specification. The manufacturer shall submit to the National Supervising Inspec

42、torate a certified statement of the structural similarities between the types of switches for which qualification is sought and a recommended grouping of switches for each test of the qualification inspection test sequence. The National Supervising Inspectorate shall determine the appropriate groupi

43、ng of structurally similar components. 3.4 Quality Conformance Inspection: The Blank Specification associated with the Sectional Specification shall prescribe the test schedule for Quality Conformance Inspection. This schedule may also prescribe the grouping (formation of inspection lots), sampling

44、and period over which production lots may be grouped for lot-by-lot and periodic inspection. Inspection Levels and AQLs shall be specified by the Blank Detail Specification and shall be selected from those given in IEC Publication 410 or MIL-STD-105. 3.4.1 Certified Records of Released Lots When the

45、 Detail Specification specifies the issuance of a Certified Record of Released Lots, it shall prescribe the tests for which the results shall be presented and shall specify how these results shall be expressed. As a minimum, these records shall contain attributes information (i.e. number of componen

46、ts tested and number of defective components) for tests in the subgroups covered by periodic inspection without reference to the parameters for which rejection was made. EIA 4980000-A 87 3234b00 0073823 3 EIA-4980000-A Page 8 3.4.2 3.4.3 3.494 3.4.5 3.4.6 3.4.7 Delayed Delivery Switches held for mor

47、e than 36 months following the release of the inspection lot shall be re-examined prior to delivery. The procedure of the re-examination shall be approved by the National Supervising Inspectorate. Once a lot has been reinspected, its quality is reassured for 36 months. Release of Lots for Delivery T

48、he lots shall be released or rejected on the basis of the lot-by-lot tests unless otherwise prescribed in the relevant specification. Delivery of Tested Switches Only switches subjected to lot-by-lot inspections may be included in the lot to be delivered. Switches subjected to qualification or perio

49、dic inspections shall not be included in the lot to be delivered. Formation of Inspection Lots For the purpose of quality conformance inspection, structurally similar switches may be combined into an inspection lot. Lot-by-Lot Inspection Tests The minimum requirements for lot-by-lot inspection shall be prescribed in the Sectional Specification. Periodic Inspection Tests The tests required for periodic inspection shall be prescribed by the Sectional Specification. The periodic inspection shall be performed at intervals no greater than 36 months. EIA 4980000-A 89 m 32346