Riddle - guess a devices. Calibration of the E8021 voltmeter by adjusting the additional resistance.
In this video I will show three assembled printed circuit boards of unknown purpose, and I suggest you write in the comments what kind of devices they are. I will reveal a terrible secret in the next video.
Basically, this video is devoted to the adjustment of the additional resistance in the E8021 voltmeter. Also at the end of the video, the measurement of the mains voltage from 150 to 150 volts with digital and pointer systems.
The E8021 voltmeter of the electromagnetic system is designed to measure voltage in AC electrical circuits. Switchboard instruments of the E8021 family allow measuring currents up to 50 A and voltages up to 250 V with direct connection.
The instrument that is being calibrated in this video was manufactured in 1971. Made in USSR!
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Performer: http://audionautix.com/