1、$ EIA 448-23 90 = 3234600 0069079 T c3 Cu I m d d I 9 w APPROVED: June 21, 1990 EIA STANDARD Surface Mountable Switches, Qual if cat ion Test EIA-448-23 AUGUST 1990 ELECTRONIC INDUSTRIES ASSOCIATION ENGINEERING DEPARTMENT I ! EIA 448-23 90 3234b00 0069080 b Y * NOTICE EIA Engineering Standards and P
2、ublications 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 obtaining with minimum delay the proper product for his particul
3、ar need. Existence of such Standards and Publications shall not in any respect preclude any member or nonmember of EIA from manufacturing or selling products not conforming to such Standards and Publications, nor shall the existence of such Standards and Publications preclude their voluntary use by
4、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 their adoption may involve patents on articles, materials, or processes. By such action, EIA does not assume an
5、y 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 International Electrotechnical Commission activity has not progressed to
6、 the point where a valid comparison between the EIA Standard and the IEC document can be made. e This Standard does not purport to address all safety problems associated with its use or all applicable regulatory requirements. It is the responsibility of the user of this Standard to establish appropr
7、iate safety and health practices and to determine the applicability of regulatory limitations before its use. Published by ELECTRONIC INDUSTRIES ASSOCIATION Engineering Department 2001 Pennsylvania Ave., N.W. Washington, D.C. 20006 PRICE: $1 1 .O0 Copyright 1990 All Rights Reserved Printed in U.S.A.
8、 EIA 448-23 90 3234600 0069081 8 S EIA-448-23 Page i Qualification Test Surface Mountable Switches 1.0 Switches to be tested shall have passed all Incoming Inspection require- ments. Contact resistance shall be less than 50 milliohms. Continuity/ circuit configurations shall be as specified. Switche
9、s should be sealed sufficiently to withstand preconditioning, 1.1 Contact resistance shall be measured at 20 to 50 mV and 10 mA. 2. O ?reconditioning Divide samples into two equal groups. 2.1 The first sample group shall be exposed to the requirements of EIA448-19 (vapor phase) using an appropriate
10、printed circuit board previously prepared with solder paste, and the following: 7.1.1 Fluxing: Not applicable 3.1.2 Soldering: Not applicable 2.1.3 Cleaning: Spray, using solution D (deionized water/detergent). 2.2 The second sample group shall be exposed to the requirements of EIA448-21 (infrared)
11、using an appropriate printed circuit board previously prepared with solder paste, and the following: 2.2.1 Fluxing: Not applicable 2.2.3 Soldering: Not applicable 7.2.3 Cleaning: Spray, using solution D (deionized water/detergent). 2.3 Evaluation following preconditioning: contact resistance shall b
12、e less than 50 milliohms and continuity/circuit configuration shall be as specified. 2.4 Remove those seals that are intended to be removed in order to properly actuate the switches. Set 1/2 of switches in each group in open position, 1/2 in closed position, and note in report which switches are in
13、each position. 3.0 Aging 3.1 Divide test lot into two equal groups. 3.2 Group 1: Bake at 7F +PC (15gF +PF) for 97 hours. -2 -2 3.3 Group 2: Expose to steady state (sealed container) humidity in accordance with EU RS-186-3E Method 3 for 96 hours. Preconditioning, loading and polarizing voltages are not applicable. - EIA 448-23 90 M 3234b00 0069082 T M ETA-448-23 Page 2 I. 4.0 Final measurements: 4.1 Contact resistance shall be less than 100 milliohms. 4.2 Continuity/circuit configurations shall be as specified.
