1、- - EIA 4988000 88 = 3234600 0073805 3 = T .= t I m a - Lu ANSI/ EIA-4988000-1988 APPROVED: APRIL 28, 1988 EIA SPEC I F I CAT I ON Sectional Specification for Touch Stroke Switch Panels of Certified Quality EIA-498B000 JULY 1988 ELECTRONIC INDUSTRIES ASSOCIATION ENGINEERING DEPARTMENT EIA 4988000 88
2、 m 3234600 0071806 3 m A 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 obtainin
3、g with minimum delay the proper product for his particular need. Existence of such Standards and Pub- lications 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 articl
5、es, 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 Recom- mended Standard or Publication. This EIA Recommended Standard is considered to have international stan- dardization implicatio
6、ns, but the IEC activity has not progressed to the point where a valid comparison between the EIA Recommended Standard and the IEC Recommendation can be made. Pub 1 i shed by ELECTRONIC INDUSTRIES ASSOCIATION Engineering Department 2001 Eye Street, N.W. Washington, D.C. 20006 - Copyright 1988 ELECTR
7、ONIC INDUSTRIES ASSOCIATION All rights reserved PRICE: $10.00 Printed in U.S.A. I EIA 4788000 88 m 3234600 0071807 5 m EIA-498B000 Page 1 SECTIONAL SPECIFICATION FOR TOUCH STROKE SWITCH PANELS OF CERTIFIED QUALITY (From EIA Standards Proposal No. 2020, formulated under the cognizance of P-13.3 Subco
8、mmittee on Non-Sensitive Pushbutton and Keyboard Switches.) 1.0 SECTION ONE - SCOPE AND OBJECT 1.1 Scope This Sectional Specification covers a limited range of touch stroke tactile feel switch panels, the bases for which are etched type printed circuit boards. These switch panels are intended for us
9、e in low input rate data entry applications. Both product qualification and capability approval requirements are included in this document. 1.2 Object The objects of this Specification are to prescribe: 1.2.1 Preferred ratings and characteristics, 1.2.2 Appropriate test procedures, 1.2.3 General per
10、formance requirements, 1.2.4 A fixed sample size product qualification test schedule, 1.2.5 Capability approval requirements and test schedules, and 1.2.6 Quality conformance test schedules. 2.0 SECTION TWO - GENERAL 2.1 Related documents The following documents of the issue in effect form a part of
11、 this Specification to the extent specified herein: ANSI/EIA-4980000 Generic Specification for Keyboard Switches of Certified Quality. EIA 4988000 88 m 3234b00 0071808 7 m EIA-498B000 Page 2 2.2 Units and Symbols Units and symbols shall be as specified in EIA-4980000. 2.3 Terminology Terminology sha
12、ll be in accordance with EIA-4980000. Terminology peculiar to the products covered by this Specification are defined as follows. Terminology peculiar to Detail Specifications shall be defined in those documents. 2.3.1 Operating Temperature Range The range of temperature within which the keyboard can
13、 be safely operated. . 2.3.2 Overlay A thin plastic sheet, either flat-or embossed, adhesive bonded to the top surface of a printed circuit board. It serves to enclose or seal the switch contact surfaces and to bear whatever legending is required on the panel. 2.3.3 Graphics See Legend. 2.3.4 Legend
14、 All of the marking on the switch panel ranging from the identification of each switch position to, and including, all of the nomenclature and decorative effects on the front panel of a piece of electronic equipment. 2.3.5 Key Force The force which must be applied to the key to cause the moving cont
15、act to change its state (i.e., from open to closed or vice versa). 2.3.6 Key Travel The distance through which the key travels from its normal position to its full travel (bottoming) position. EIA 4988000 88 W 3234600 71809 9 W . EIA-498B000 Page 3 2.4 Preferred Ratings and Characteristics Whenever
16、possible, the values, ratings and characteristics shall be selected from the following: 2.4.1 Preferred Ratings The electrical ratings shall be specified in Details Specifications. 2.4.1.1 Applied voltage:. preferred values are 5 Vdc, 12 Vdc, 24 Vdc. 2.4.2 Preferred Characteristics 2.4.2.1 The follo
17、wing environmental characteristics are preferred for keyboards intended for normal indoor use: a) Operating temperature range OOC! to 55OC b) Storage temperature range -4OOC to 7OoC c) Humidity d) Vibration 5% to 95% RH noncondensing 10 to 55 Hz, .O05 D.A. 2.5 Marking Marking additional to the follo
18、wing may be applied to the keyboard provided it does not interface with, obscure, or confuse the required marking. Required marking shall be as follows: 2.5.1 Identification marking The keyboard shall be legibly marked with the following information: 2.5.1.1 Manufacturers name, 2.5.1.2 Identifying n
19、umber (IECQ, EIA, or users part number), EIA 498B000 88 m 3234b00 007l1810 5 EIA-498B000 Page 4 2.5.1.3 Manufacturers part number, and 2.5.1.4 Date code in accordance with EIA-476. . 2.5.2 Terminal Marking When specified by the Detail Specification or the procurement documentation, the terminals sha
20、ll be legibly marked with the specified identification. 2.5.3 Overlay Legending The overlay shall be permanently and legibly legended as specified in the Detail Specification or the procurement documentation. . 2,6 Detail Specification 2.6.1 2.6.2 2.6.3 2.6.4 General Environment characteristics: ope
21、rational and non-operational environmental characteristics shall be specified in Detail Specifications. Detail Specifications shall be derived from the instructions given in EIA-498BA00 and shall contain all required information directly or by reference. Detail Specifications shall not specify requi
22、rements inferior to those of the Generic or Sectional specif,ications. When more severe requirements are included they shall be listed in the Detail Specification and indicated in the test schedule by, for instance, an asterisk. Environmental Characteristics Operational and non-operational environme
23、ntal characteristics shall be specified in Detail Specifications. Electrical Characteristics The electrical characteristics shall be specified in Detail Specifications. Among the items to be considered, as appropriate are: 2.6.4.1 Power input (voltage and current) 2.6.4.2 Logic convention (define vo
24、ltage for Logic O and 1) , ,- a Q I - _- EIA 498B000 88 m 3234b00 007LBLL 7 m EIA-498B000 Page 5 2.6.4.3 Output signals (data and clock outputs) 2.6.4.4 Input signals (DATA, CEN, CLOCK) 2.6.4.5 Interface connector (identify pin functions) 2.6.5 Mechanical Characteristics Mechanical characteristics s
25、hall be specified in Detail Specifications, including: 2.6.5.1 Key force: The preferred range is 2.45 to 5.88 N (250 to 600 grams or 0.55 to 1.32 pounds). 2.6.5.2 Key travel: The preferred range is 0.28 to 0.51 mm (0.011 to 0.020 inch). 2.6.5.3 Physical dimensions 2.6.5.4 Terminations 2.6.5.5 Key ar
26、rangement 2.6.5.6 Threads 2.6.5.7 Enclosure 2.6.5.8 Sealing 2.6.6 Functional Characteristics The functional characteristics shall be specified in Detail Specifications. 2.6.7 Inspection The Detail Specification shall contain the complete technical requirements for inspection including the quality co
27、nformance test schedule. If the technical requirements for the Generic and/or Sectional Specification relative to inspection are not entirely suitable (either for technical reasons or for special applications) to the keyboard described in the Detail Specification, the Detail Specification shall clea
28、rly cite the various amendments which are to be made to these requirements. EIA 4988000 88 3234600 0073832 9 EIA-498B000 Page G 3.0 SECTION THREE - QUALITY ASSESSMENT PROCEDURES 3.1 Primary Stage of Manufacture The first process subsequent to the manufacture of finished piece parts which, when assem
29、bled, form the keyboard. 4.0 SECTION FOUR - TEST METHODS AND REQUIREMENTS The test methods and the test requirements of EIA-4980000 shall apply. - EIA 4988000 88 = 3234600 0071813 O EIA STANDARD AND SPECIFICATION NUMBERING STANDARD A document that establishes engineering and technical requirements f
30、or processes, procedures, practices and methods that have been decreed by authority or adopted by consensus. Standards may also be established for selection, application and design criteria for material. Standards and other documents not in the specification format use only the EIA basic numbering s
31、ystem as follows: EIA- 12 3 Original Standard EIA-123-1 Addendum to the Original Standard EIA-123-A First Revision of original Standard incorporating all Addenda SPECIFICATION A document prepared specifically to facilitate procurement which clearly and accurately describes the essential technical re
32、quirements for purchased material. Procedures necessary to determine that the requirements for the purchased material covered by the specification have been met shall also be referenced or included. EIA Specifications use the following system: 0 EIA123AAAA I Standard or Generic Specification Indicat
33、or Standard Prefix for all Numbers Sectional Specification Designator Blank Detail Specification Designator Detail Specification Designator EIA 1230000 is a Generic Specification EIA 123A000 is a Sectionai Specification EIA 123AA00 is a Blank Detail Specification EIA 123AAAA is a Detail Specification EIA 12300AA is a Detail Specification for which no Sectional or Blank Detail Specification was issued NOTES 1. Some older specifications may not have been converted to this numbering system. 2. See EP-11, “Guide for the Preparation of Specifications Using IECQ-System Format,“ for more detail.
