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IEEE ASA C39.1-1955

Historical Revision

ASA American Standard Requirements for Electrical Indicating Instruments Panel, Switchboard, and Portable Instruments

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- Superseded.
This standard applies to the following kinds of electrical indicating instruments for direct and alternating current, including instruments with prefixes such as micro, kilo, etc: (a) Ammeters (fc) Voltmeters. (c) Wattmeters (c?) Varmeters (reactive-volt-ampere meters) (e) Frequency meters (/) Power-factor meters (g) Indicating instruments functioning on the above principles, but indicating derived quantities 1.2 This standard may apply, with suitable exceptions, to instruments constructed for special requirements. For example, ultrasensitive d-c micro-ammeters. high-resistance voltmeters, thermo-milliammeters, thermo-voltmeters of the vacuum-couple type, and instruments with special and unusual ranges. 1.3 This standard does not apply to the following kinds of instruments: (a) Indicating instruments provided with arrangements for curve drawing, contact making, etc (b) Small instruments of types and sizes where the indications are only approximate. For example, small polarized-vane ammeters used on automobiles, battery-charging outfits, etc

SDO IEEE: Institute of Electrical and Electronics Engineers
Document Number C39.1
Publication Date July 27, 1955
Language en - English
Page Count 50
Revision Level
Supercedes
Committee
Publish Date Document Id Type View
June 30, 1959 C39.1-1959 Revision
July 27, 1955 C39.1-1955 Revision