ECA 498BAAA-1988 Detail Specification for Capability Approval of Metal Dome Contact Touch Stroke Switch Panels.pdf

1、- EIA 498BAAA 88 3234600 0073780 O - J L+a ANSII EIA-498 BAAA-1988 APPROVED: APRIL 28, 1988 a a m Q) o) d I EIA S P ECI F I CAT I QN Detail Specification for Capability Approval of Metal Dom Contact Touch Stroke Switch Panels EIA-498BAAA ELECTRONIC INDUSTRIES ASSOCIATION ENGINEERING DEPARTMENT c- EI

2、A 4SBAAA 88 m 3234600 0073783 2 m 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 select

3、ing and obtaining 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

4、 existence of such Standards and Publications preclude their voluntary use by those other than EIA members, whether the standard it; to be used either domestically or internationally. Recommended Standards and Publications are adopted by EIA without regard to whether or not their adoption may involv

5、e patents on articles, 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- dar

6、dization implications, 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. Published by ELECTRONIC INDUSTRIES ASSOCIATION , Engineering Department 2001 Eye Street, N.W. Washington, D.C. 20006 Copyr

7、ight 19 8 8 Ail rights reserved ELECTRONIC INDUSTRIES ASSOCIATION PRICE: $11.00 Printed in U.S.A. e EIA 498BAAA 88 m 3234600 0071782 4 m E IA- 4 9 8BAAA Page 1 GENERIC SPECIFICATION NUMBER EIA 4980000 ELECTRONIC COMPONENTS OF ASSESSED QUALITY IN ACCORDANCE WITH . EIA 498B000 OUTLINE DRAWING THIS IS

8、A CAPABILITY APPROVAL DOCUMENT. SEE FIGURES 1 AND 2 FOR RANGE OF SWITCH PANELS COVERED BY THIS SPECIFICATION. ETAIL SPECIFICATION NUMBER BLANK DETAIL SPECIFICATION NUMBER EIA 498BA00 DRODUCT DESCRIPTION TOUCH STROKE SWITCH PANELS UTILIZING: 1) METAL DOME CONTACT. 2) PRINTED CIRCUIT BOARD BASE. 3) SM

9、OOTH OR EMBOSSED OVERLAY. 4) MIN. 12.7mm (0.500“) CENTER-TO-CENTER DOME SPACING . 5) CAPABILITY APPROVAL. ELECTRICAL CIRCUIT SPST PER STATION WITH VARIOUS POSSIBLE INTER- CONNECTION OF STATIONS. TYPICAL CONSTRUCTIOb SEE FIGURE 2 APPLICATION/ ASSESSMENT LEVEL INDOOR CONTROLLED ENVIRONMENT APPLICATION

10、S I INFORMATION ON THE AVAILABILITY OF COMPONENTS QUALIFIED TO THIS SPECIFICATION IS GIVEN IN I THE QUALIFED PRODUCTS LIST EIA 498BAAA 88 W 3234b00 0073783 b EIA-4 9 8BAAA Page 2 DETAIL SPECIFICATION FOR CAPABILITY APPROVAL OF METAL DOME CONTACT TOUCH STROKE SWITCH PANELS (From EIA Standards Proposa

11、l No. 2056, formulated under the cognizance of the EIA P-13.3 Subcommittee on Non-Sensitive and Keyboard Switches.) The complete requirements for the switches described herein shall consist of this Detail Specification, the latest issue of EIA- 498B000, IISectional Specification for Touch Stroke Swi

12、tch Panels of Certified Quality,tg and the latest issue Of EIA-4980000, !Generic Specification for Keyboard Switches of Certified Quality. 1.0 SECTION ONE - SCOPE AND OBJECT 1.1 Scope The touch stroke keyboards of certified quality covered by this Specification: 1.1.1 1.1.2 1.1.3 1.1.4 1.1.5 Shall u

13、tilize a copper clad and etched printed circuit board of no more than 1161 square centimeters (180 square inches) in area, and employ the metal lldomell. switch technolsgy in the contact system. Shall utilize a smooth or embossed overlay of polyeste? or polycarbonate as the front panel surface, the

14、overlay being printed in the color(s), configuration and with the nomenclature required by the procurement documentation. Shall have a minimum center-to-center spacing of the ttdomelt contacts of 12.7 mm (0.500 inch). Shall have a maximum rated Voltage of 24 Vdc, a maximum rated current of 10 a, a m

15、inimum voltage breakdown of 250 Vac, a minimum life expectancy of 1, operations per contact, and shall have contact characteristics compatible with digital logic circuitry. Are intended for use in indoor controlled environments. a O e EIA 49BAAA 8 W 3234600 0071784 W EIA-4 9 8BAAA Page 3 1.2 Object

16、The object of this Detail Specification is to provide all information required for identification, quality assessment and certification of these keyboards. The information contained herein or by reference is complete and sufficient for inspection purposes. 2.0 SECTION TWO - GENERAL The related docum

17、ents, units, symbols, terminology, standard values and preferred values are as prescribed in EIA-498B000. 2.2 Marking 2.2.1 Part Number Each product shall be classified and identified (marked) as follows: 2.2.1.1 The number of this Specification (EIA498BAAA) 2.2.1.2 Dome size designator consisting o

18、f the first two digits of the nominal diameter (in thousandths of an inch) of the smallest dome contact used in the assem)slyo If more than one size of dome is used, these two digits shall be followed by a slash mark (/). Only dome contacts which have successfully passed qualification tests can be u

19、sed in a certified keyboard o 2.2.1.3 Flat or embossed overlay designator consisting of either the letter F for flat, or the letter E for embossed. 2.2.1.4 Overlay material designator consisting of either the letter E for polyester, or the letter C for polycarbonate. EXAMPLE: EIA498BAAA25/EE identif

20、ies a keyboard using more than one qualified dome contact size, the smallest of which has a nominal .25 inch diameter, and having an embossed overlay made of polyester material. EIA 498BAAA 88 W 3234b00 0071785 T W EIA-4 9 8 BAAA Page 4 2.7 Refer to clause 3.1 for common features and dimensional inf

21、ormation for the family of components covered by this Detail Specification. 3.0 SECTION THREE - QUALITY ASSESSMENT PROCEDURES 3.1 The quality assessment procedures are prescribed in Section Three of EIA-498B000 and are supplemented by the following information: 3.1.1 Qualification Approval Inspectio

22、n Tests The qualification approval inspection tests are prescribed in Table I herein for the qualification of the entire range of product capabilities covered by this Detail Specification. 3.1.2 Test Specimens Four types of test specimens may be required for qualification, the exact number depending

23、 on the range of product for which capability approval is sought. These test specimen types are as follows: Type W - Twelve button array configured in accordance with Figure 1 and utilizing the smallest diameter dome contact for which qualification is sought. The printed circuit board shall have a n

24、ominal thickness of 3.18 mm (0.125 inch) with a single pole, common bus circuit and rear ground plane on material in accordance with clause 3.1.3.5. The overlay shall be made of the minimum thickness for which qualification is sought, may be either flat or embossed, shall be printed in four appropri

25、ate colors with each switch position separately identified with a number, letter, or symbol and shall be made from either polyester or polycarbonate material, or both, depending on the extent of qualification sought. If the overlay is embossed, the embossing shall be of the “rail and pillowt1 type a

26、s shown in Figure 1. Type X - Same as Type W except made with the largest dome contact diameter for which qualification is sought. The center-to-center ELA LiBBAAA 88 m 323i.1600 007178b L m EIA-4 9 8 BAAA Page 5 distance shall be the minimum that can accommodate the particular dome size, and the ou

27、ter dimensions of the printed circuit board shall be adjusted accordingly. The printed circuit board material shall have a nominal thickness of 0.79 nun (0.031 inch) Type Y - Same as Type W except one set of test specimens shall be made using each additional dome contact diameter for which qualifica

28、tion is sought. Switch center-to-center distance shall be the minimum for the particular dome contact used and the overall dimensions of the test specimens shall be adjusted accordingly. The printed circuit boards shall all have a nominal thickness of 1.57 nun (0.062 inch). Type Z - Shall be as desc

29、ribed in Figure 2 using the largest dome contact diameter for which qualification is sought. The printed circuit board shall be made of material in accordance with clause 3.1.3.5, and with a nominal thickness of 3.18 nun (0.125 inch) with a single pole, common bus circuit with a rear ground plane. T

30、he overlay shall be made of the thinnest material for which qualification is sought, and a minimum of two specimens shall be made and tested from each overlay material type (i.e., polyester, polycarbonate) for which qualification is sought. Each overlay shall be printed in four colors and each switc

31、h position shall be separately identified with a number, letter or symbol. When embossing is included, each switch position shall be lrail and pillow1 embossed as shown in Figure 1. Drawings I similar to Figure 1, shall be provided by the source seeking qualification and approved by the qualifying a

32、gency. 3.1.3 Extent of Qualification and Capability Approval The limits of qualification and capability approval shall be as follows: 3.1.3.1 Dome thickness: Limited to those sizes and configurations (material, thickness, form) tested and qualified. EIA 498BAAA 88 3234600 0071787 3 = EIA-4 9 8BAAA P

33、age 6 3.1.3.2 3.1.3.3 3.1.3.4 3.1.3.5 3.1.3.6 Overlay: Either flat or embossed. Qualification of embossed also qualifies flat. Overlay materials: Limited to those materials tested (either polyester, polycarbonate, or both). Overlay thickness: The thickness tested is the minimum qualified thickness;

34、greater thicknesses are considered qualified. Printed circuit board materials: Any material suitable for the particular application of 0.79 m (0.031 inch) or greater nominal thickness. Printed circuit: Any circuit for which the minimum spacing between mutually insulated elements (traces, pads, etc.)

35、 is not less than the minimum for the tested specimens. 3.4.6 Lot-by-Lot Inspection Tests The lot-by-lot inspection tests are as shown in Table II herein. 3.4.7 Periodic Inspection Tests The periodic inspection tests are as shown in Table II herein. 4.0 SECTION FOUR - TEST METHODS AND REQUIREMENTS T

36、he test methods and requirements are prescribed in Section Four of EIA-498000 and are supplemented by the following: 4.6 Operating Characteristics Unless otherwise specified in the procurement document, actuator travel shall be 0.508 mm (0.020 inch) maximum, 4.8 4.11 4.14 EIA 498BAAA 88 m 3234b00 00

37、73788 5 m Y EIA-4 9 8 BAAA Page 7 and operating force shall be within the limits specified below: grams ( force) UNITS newtons oz (force) Min. Operating Force Max. Operating Force 250 8.8 2.27 600 21.2 5.88 Switch Resistance The switch resistance test shall be in accordance with ANSI/EIA-498000, cla

38、use 4.8, except that measurements shall be made with an applied operating force of 6.68 N (1.5 pounds). Switch resistance shall not exceed 10.0 ohms. Button Temperature - not applicable. Logic Level Endurance This test is identical to that of ANSI/EIA-498000, clause 4.14, except: 4.14.1 The end of t

39、he actuator which impinges on the switch overlay to actuate the switch shall be a rubber hemisphere 6.35 to 9.53 mm (0.250 to 0.375 inch) diameter, and made of 30 Durometer silicone rubber. It is intended to simulate the wear effect of human finger operation. 4.14.2 The number of sticks and misses a

40、llowed is 5 total %sr each keypad or switch assembly under test. 4.14.3 Each switch position of each test specimen, is to be tested for 1,000,000 . cycles dt a cycling rate of 500 & 20% cycles per minute with a minimum of 5.88 N (600 grams or 1.32 pounds) force applied to each switch in the actuate

41、position. EIA L1SBBAAA 88 323L1b00 0073789 7 EIA- 4 9 8 BAAA Page 8 4.16 Vibration - not applicable. 4.17 Shock - not applicable. 4.20 Input Power Consumption - not applicable. 4.22 High - Low Temperature Operation. The switches shall be tested in accordance with ANSI/EIA-488 Method 10. The Eollowin

42、g details shall apply: 4.22.1 The maximum temperature shall be 52OC a8d the minimum temperature shall be o c. 4.22.2 Each switch position on each test specimen shall be operated 100,000 cycles at the high temperature at a cycling rate of 500 & 20% cycles per minute e A maximum of 60 minutes is allow

43、ed for transfer from the high to the low temperature. Each switch of each specimen shall then be operated 100,000 cycles at the low temperature at a cycling rate of 500 & 20% cycles per minute. 4.23 Salt Spray - not applicable. 4.24 Altitude - Operational - not applicable. 4.25 Altitude - Transporta

44、tion - not applicable. 4.26 Sand and Dust - not applicable. 4.27 Chromaticity - not applicable. 4.28 Luminance - not applicable. 4.29 Adhesion of Overlay - under development. EIA 498BAAA 88 3234600 0073790 3 EIA- 4 9 8BAAA Page 9 a a (C. w E H n w n w n w Pa um W 140 VIH al - an 3$ hN NNN u v u O O

45、I- z O H mu rlrl O u c) (d * O v) N h QI -If- u 4 at0 aln nn ala QI4 4-I VINCI)- WU u o al aal mCI) u O u I O alal alal rnw H HJ a “& 4 Fa U ra W E? O u u l4 B 13 E? O l4 W EIA 498BAAA 88 m 3234600 007L79L 5 m EIA-4 9 8BAAA Page LO TABLE II QUALITY CONFORMANCE INSPECTION TEST SCHEDULE TEST METHODS A

46、ND GROUPS (TEST FREQUENCY ACCEPTANCE TESTS GROUP A (LOT-BY-LOT) Visual examination Major Minor Electrical circuitry Switch resistance PERIODIC TESTS GROUP B (EVERY 6 MONTHS) Operating characteristics Contact bounce So le rab ili t y Terminal strength Logic level endurance GROUP C (EVERY 6 MONTHS) Ad

47、hesion of overlay Thermal shock Visual examination Voltage proof GROUP D (EVERY 3 6 MONTHS ) Requalif ication (See Table I) ASSESSMENT LEVELS TEST NO. VID OR VINDI1 LEVEL “ C IL AQL 4.4 4.8 4.29 4.6 4.19 4.10 4.13 4.14 NEW 4.15 4.4 4.9 ND ND ND ND ND D D D D D ND ND D 3 TOL EIA 498BAAA 88 3234b00 00

48、73792 7 16.3 12.70 (.64)Tl= 2 .500), EO. SPS , TOL. NON-ACCUM. E IA- 4 9 0BAAA Page 11 7 iY4-40 UNC-2A THREAO.(.468) (*.O201 LONG 10.92(.430t.003) EO. SPS . NON-ACCUM. ROW 1 ROW 2 ROW 3 ROW 4 VARIABLE TOTAL (2.781 ,6.3 THICKEESC NOTES I HE 4 PLACES / CLARITY .-I- / f W,(2.2821 DIM. I. DIKNSIONC MIE

49、OENTED AS FOUOYS: 0.00 = HI (O.Oo0) = 1C 2. HETRIC DIffNSINS ARE BASED UWN 1.0 I“ = 25.4 M 3. MESS OTHERWISE SPECIFIED. IW (.430*.003) DIffNSION TOLERANCES AREI RAIL I SOUARE 1 TWO PLACE 4.00) = t.O1O 1 TMEE PLACE (.o001 = 1.0i5 4. THE OVERLAY CUSI COCPLETELY COVER THE WAC OF THE P.C. BOARD. II u I CL. uuc I mnncccn I .20 J (.008*.003) EMBOSSED -=4 .127J (.005*.002) TYP. PILLOW HEIGHT OVERLAY EMOSS1 ffi DETAIL FIGURE 1 EIA 47BBAAA 88 3234600 0071773 7 133.4 r (5.251 . 125) I LL EIA-498BAAA Page 12 - 50.80 .- (2.000) - O0 25.40 *O . 1 I .o00