1-67A WATT-HOUR METER is basically a small motor whose instantaneous speed is proportional tothe power through the motor. The total revolutions in a given time are proportional to the total energy, orwatt-hours, used during that time. Watt-hour meters measure energy.FREQUENCY METERSare used to measure the frequency of an ac signal. The two basic typesare the vibrating-reedfrequencymeter which is usually used as an in-circuit meter, and the moving-diskfrequencymeterwhich is usually used as an out-of-circuit meter.
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