1、EIA 448-20 87 = 3234600 0067064 8 AN S I / E I A - 4 4 8 - 2 O- 1 9 8 9 APPROVED: August 21, 1989 IA STANDARD Test Method -for Electromechanical Components Test Method for Lens Face Touch Temperature SEPTEMBER 1989 ELECTRONIC INDUSTRIES ASSOCIATION ENGINEERING DEPARTMENT 4 EIA 448-20 89 ? 3234b00 00
2、b90b5 T ? NOTICE EIA Engineering Standards and Publications are designed to serve the public interest through eliminating misunderstandings between manufacturers and pu rc hasers, f aci I i tat i ng i nterc hang ea bi I i ty and improve ment of prod ucts, and assisting the purchaser in selecting and
3、 obtaining 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-memberof EIA from manufacturing or selling products not conforming to such Standards and Publications, nor shall the existence of
4、 such 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 a
5、rticles, 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 Standard is considered to have international standardization implication, but the
6、International Electrotechnical Commission activity has not progressed to the point where a valid comparison between the EIA standard and the IEC dscumen can be made. b This Standard does not purport to address all safety problems associated with its use or all applicable regulatory requirements. It
7、is the responsibilityof the user of this Standard to establish appropriate safety and health practices and to determine the applicability of regulatory limitations before its use. Copyright 1989 Published by ELECTRONIC INDUSTRIES ASSOCIATION Eng i neering Department 2001 Eye Street, N.W. Washington,
8、 D.C. 20006 PRICE: $10.00 All rights res-erved Printed in U.S.A. -. W? EIA 448-20 7 M 3234600 00b70bb 1 c EIA48-20 Page 1 Method 20 (From Standards Proposal No. 2107, formulated under the cognizance of EIA P-13 Committee on Switches) 1.0 PuRposE The purpose of this test method is to determine whethe
9、r the switch lens face meets the touch temperature (rise above ambient requirements) as defined in the Detail specification. 2.0 TEsTcomITIoMs 2.1 Individual switches sha be mounted on a 58 mm x 50 mm x 1.5 mm thick, unfinished aluminum paneL 2.2 Panel cutout and mounting hardware as identified in t
10、he Detail Specificaton shali be used. 2.3 The test shail be performed in still air which has a temperature of 25“ C +/- CO P 3.0 PROCEDURE 3.1 The lens face temperature shall be measured with iamp(s) energized, in the center or at the point specified in the Detail Specification, with the long axis o
11、f the switch horizontal. An optical infrared thermometer is a device suitable for making this surface temperature measurement. 3.2 The lens face temperature shall be measured at 5 +/-1 minute intervals until stable. 3.3 The temperature shall be considered stable when three consecutive readings indic
12、ate no change in temperature greater than lT. 3.4 The ambient temperature shall then be measured at a point sufficiently far from any heat source, including the units under test, to obtain a representative temperature value for the air reaching the test unit by convection. 3.5 The touch temperature
13、shall then be determined by subtracting the measured ambient temperature fiam the sttibilized iefib fl&ibC tki+kltltt.& *- EPA q48-20 89 m 3234600 00b9067 3 m EIA-448-20 Page 2 4.0 SUMMARY The followings details shall be specified in the Detail Specification. 4.1 The allowable touch temperature in degrees C. -. 4.2 The touch temperature measurement point, if other than the center. 4.3 4.4 The number of lamps to be energized, if multilamp. The lampjs) to be used, by pait number and the energizing voltage. 4.5 Mounting panel cutout and mounting means.
