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SCR test circuit with speed performance

VD diode under test into the socket as shown in the circuit X1, X2, power supply to the VD with reverse breakdown voltage, V from the voltage meter can be read on the stability of the tube voltage Uz, from the series in mA mA in the circuit over the table, you can read the current value of the stable work. Adjust potentiometer RP, mA value of the table also changes the direction. At this point the changes observed voltmeter to voltage changes in the value of Uz the smaller the better.

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SCR test circuit with speed performance