Superseded Standard

ASA C39.1-1955

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

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

Status
Superseded Standard
Superseded by
C39.1-1959
Board Approval
1955-08-12
History
ANSI Approved:
1955-07-27
Published:
1955-07-27

Working Group Details

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