1、 n I a I o I ao t * I O. - R - EIA 448-3-A 90 m 3234600 0069089 2 m * ANSI/ EIA-448-3-A-19 90 APPROVED: April 27, 1990 STANDARD Method 3 Standard Test Methods for Electromechanical Switches: Chromaticity EIA-448-3-A JUNE 1990 ELECTRON IC IN DUSTRI ES ASSOCIATION ENGINEERING DEPARTMENT EIA 44-3-A 90
2、 m 3234600 00b9090 9 m NOTICE s 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 o
3、btaining 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 nonmember of EIA from manufacturing or selling products not conforming to such Standards and Publications, nor shall the existence of s
4、uch 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 art
5、icles, 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 In
6、ternational 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 Standard does not purport to address all safety problems associated with its use or all applicable regulatory requirements. It is
7、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. (From Standards Proposal No. 2307 formulated under the cognizance of the P-13 Committee on Switches.) Published by ELECTRO
8、N IC IN DUSTRI ES 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. L EIA 448-3-A 90 3234600 O069093 O EM-448-3-A Page 1 METHOD 3 CHROMATICITY 1. PURPOSE The purpose of this test method is to de
9、termine if the lens colors fall within specified limits. 2. PROCEDURE 2.1 The chromaticity shall be determined by spectrometric or visual means using one of the Techniques described below. (a) Technique I: Spectrophotometer, flat slab - Chromaticity shall be determined using a spectrometer, flat sla
10、b material of the same density and thickness as the shaped filter, and necessary calibration filters. (b) Technique II: Spectroradiometric - Chromaticity shall be determined using a spectroradiometer, a complete illuminated pushbutton assembly, calibrated lamps of specified color temperature, and ne
11、cessary calibration filters. (c) Technique III: Visual Comparator - Chromaticity shall be determined by a color comparator, necessary high and low limit filters of known chromaticity, and calibrated light sources of specific color temperature. 3. SUMMARY The following details must be specified in th
12、e individual specification: 3.1 The chromaticities of the lens color shall be expressed as x and y coordinated on the 1931 CIE Chromaticity Diagram or as u & v1 on the 1976 CIE Chromaticity Diagram which WU describe the acceptable area for the color. 3.2 The kelvin (K) temperature value of the illumination source. 3.3 The technique to be used to determine chromaticity. 3.4 The tolerance for acceptance/rejection criteria.
