Abstract: This phase converter utilizing a reference alternating voltage and producing a phase displaced voltage of same frequency having a common point with the reference voltage comprises a first summation and rectifying unit receiving at a first input the reference voltage and at a second input the phase displaced voltage a second summation and rectifying device receiving a first input the reference voltage and at a second input the phase-displaced voltage a second inverter being switched in at one of said inputs of said second summation and rectifying device both summation and rectifying devices having each an output connected to one input of a summation and filtration device receiving at another input a reference voltage a third inverter being switched in at the output of one of said summation and rectifying devices and said summation and filtration device having an output connected to a control terminal of a field effect transistor.

Abstract: 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.