Abstract
A new type of ultrasonic wattmeter, which employs a multiplier IC, has been designed based on the fact that the power is represented by a product of the voltage, the current, and the phase in a high‐frequency electric circuit. The output of the IC is averaged in time by a low‐pass filter to give a dc signal proportional to the power. The present wattmeter, unlike the conventional ones, has the advantage that the measurements are made over a frequency range from 1 kHz to 1 MHz and also at a high voltage load. This paper describes the outline of the wattmeter and its characteristics.
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