The error corrector analog multiplier, in particular for wattmeter of precision

摘要

An error correcting device for a multiplier of the time-division multiplication type comprising a modulator, a switch and a filter. Another switch is responsive to a time-base delivering periodically a zero signal to the modulator; a circuit memorizes and detects the difference between the product xy vitiated by switching and shifting errors and the errors themselves. The memories are of the capacitor and amplifier type, and the subtraction is obtained through the opposite of the voltages of said capacitors. This device is applicable more particularly to high-frequency, wide-range precision wattmeters adapted for d.c. calibration.