標準號：IS 1248-1968
發(fā)布日期：1968/9/1 12:00:00
實施日期：1999/12/31 12:00:00
適用范圍：1.1 This standard covers the following direct acting electrical indicatinginstruments (including the multirange instruments):a) Ammeters,b) Voltmeters,c) Wattmeters (single and poly-phase),d) Varmeters,e) Power-factor indicators,f) Frequency meters (pointer and vibrating reed type), andg) Ohmmeters (non ratio meter type).This applies to such instruments which incorporate rectifiers or diodes and to thermocouple instruments.This also applies to accessories like shunts, series resistors, inductors and capacitors (both interchangeable and with limited interchangeability). This further applies to electrically measuring equipments providing that the electrically measuring indicating instrument (receiver) only is consider-ed, and that the law for translation from the non-electrical quantity to the electrical one is known.1.2 This standard does not apply to electronic measuring apparatus in-cluding instruments incorporating transistors. This also does not cover integrating instruments, recording instruments contact instruments and interchangeable instrument transformers.