Types of Instruments

Author: E.E. Kimberly

Indicating instruments, such as ammeters, voltmeters, wattmeters, power-factor meters, and reactive-factor meters, provide continuous indications of the respective values which they are expected to measure. Integrating meters, such as watt-hour meters, ampere-hour meters, volt-ampere-hour meters and, watt-hour-demand meters, operate at rates corresponding, respectively, to the power, current, volt-ampere product, etc.; and, over any period of time, such meters indicate an integrated quantity accrued in that time.