ECA 239-A-1963 Electrical Rating Systems for Electron Tubes《电子管的电气等级系统》.pdf
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1、II Il -.-. EIA 239-A 63 = 3234600 0063505 4 /- JANUARY, 1963 - -/ EIA STANDARD for ELECTRICAL RATING SYSTEMS FOR ELECTRON TUBES ELECTRONIC INDUSTRIES ASSOCIATION (Revision of RS-239) STANDARD RS-239-A Formulated by IEDEC Elecfron Tube Council i EIA 239-A 63 W 3234b00 00b350b b . , NOTICE These stand
2、ards, adopted and issued by the Electronic Industries Association, were formulated by the Electron Tube Council of the Joint Electron Device Engineering Councils, EIA engineering standards are designed to serve the public interest through eliminating mis- understandings between manufacturers and pur
3、chasers, facilitating interchangeability and improve- ment of products, and assisting the purchaser in selecting and obtaining with minimum delay the proper product for his particular need. Existence of such standards shall not in any respect preclude any member or non-member of EIA from manufacturi
4、ng or selling products not conforming to such standards. Recommended standards adopted by EIA are without any regard to whether or not their adop- tion may in any way involve patents on articles, materials, or processes. By such action, EIA does not assume any liability to any patent owner, nor does
5、 it assume any obligation whatever to parties adopting the recommended standards. Published by ELECTRONIC IM)UST%BIES ASSOCIATION Engineering Department 11 West 42nd Street, New York 36, N. Y. 0 Electronic Industries Association I963 Ail rights reserved Brice $.25 /- f - - Printed in U.S.A. - EIA 23
6、9-A 63 m 3234600 0063507 m RS-239-A Page i ELECTRICAL RATING SYSTEMS FOR ELECTRON TUBES (From EIA Standard RS-239 and Standards Proposal No. 757 formulated under the cognizance of JEDEC Committee JT-5 on Low Power Vacuum Tubes) DESIGN-CENTER RATING SYSTEM Design-Center ratings are limiting values of
7、 operating and environmental conditions applicable to a bogey electron tube of a specified type as defined by its published data, and should not be exceeded under normal conditions. The tube manufacturer chooses these values to provide acceptable serviceability of the tube in average applications, m
8、aking allowance for normal changes in operating conditions due to rated supply-voltage variation, equipment component variation, equipment control adjustment, load variation, signal variation, environmental conditions, and variations in the characteristics of the tube under consideration and of all
9、other electron devices in the equipment. The equipment manufacturer should design so that initially no design-center value for the intended service is exceeded with a bogey tube under normal operating conditions at the stated normal supply voltage. ABSQEUTE-MAXIMUM RATING SYSTEM Absolute-Maximum rat
10、ings are limiting values of operating and environmental conditions appli- cable to any electron tube of a specified type as defined by its published data, and should not be exceeded under the worst probable conditions. The tube manufacturer chooses these values to provide acceptable serviceability o
11、f the tube, making no allowance for equipment variations, environmental variations, and the effects of changes in operating conditions due to variations in the characteristics of the tube under consideration and of all other electron devices in the equipment. The equipment manufacturer should design
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