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
12、 so that initially and throughout life no absolute- maximum value for the intended service is exceeded with any tube under the worst probable operat- ing conditions with respect to supply-voltage variation, equipment component Variation, equipment control adjustment, load variation, signal variation
13、, environmental conditions, and variations in the characteristics of the tube under consideration and of all other electron devices in the equipment. DESIGN-MAXIMUM RATING SYSTEM * Design-Maximum ratings are limiting values of operating and environmental conditions appli- cable to a bogey electron t
14、ube 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 of the tube, making allowance for the effects of changes in operating conditions due to variations
15、 in the char- acteristics of the tube under consideration. The equipment manufacturer should design so that initially and throughout life no design- maximum value for the intended service is exceeded with a bogey tube under the worst probable operating conditions with respect to supply-voltage varia
16、tion, equipment component variation, equipment control adjustment, load variation, signal variation, environmental conditions, and varia- tions in the characteristics of all other electron devices in the equipment. : A detailed description of the Design-Maximum Rating System is contained in JEDEC Pu
17、blication 37, “The Design- Maximum Rating System for Electron Tubes,” May, 1962, which is available from the EIA Engineering Department at $1.60 per copy. This JEDEC Publication gives the application of this system to circuit design evaluation and relates it to Glass A, Small Signal Amplifiers, Clas
18、s A, Power Amplifiers, Television UHF Oscillator, Power Rectifiers, and Television Horizontal Deflection Circuits. - APPENDIX Definitions of terms used in this Standard * Rating A ratifig is a value which establishes either a limiting capability or a limiting condition for an electron tube. It is de
19、termined for specified values of environment and operation and may be stated in afiy suitable terms. Rating System determining and wing ratings. A rating system is an assemblage of principles established to satisfy specified objectives for Bogey Electron Tube A bogey electron tube is a tube of a spe
20、cified type which has each and every one of its char- acteristics in agreement with the defining published bogey values for the type. Note: For practical purposes a bogey electron tube need have only those bogey characteristics which are directly applicable to the application. characteristic A chara
21、cteristic is an inherent and measurable property of a tube. Such a property may be electrical, mechanical, thermal, hydraulic, electromagnetic, or nuclear, and can be expressed as a value for stated or recognized conditions. A characteristic may also be a set of related values usually shown in graph
22、ical form. Component A component b a circuit element other than an electron device. Electron Device An electron device is an electron tube, transistor, or other semiconductor unit. Note: This definition excludes inductors, capadtors, resistors, and similar components. Electron Tube An electron tube
23、is an electron device in which conduction takes place by electrons moving through a vacuum or gaseous medium within a gas tight envelope. Note: This definition excludes semiconductor devices, inductors, capacitors, resistors, and similar components. 8 These definitions are for information only and are not to be considered as part of the Standard.
