Combined digital device "Shch4313".
Instruments for adjusting and controlling the PTA.The combined digital device "Shch4313" has been produced since 1988. The digital device is designed to measure: strength and voltage of a direct current; the rms value of the strength and voltage of the alternating current of a sinusoidal form; resistance to direct current. The device is powered from an alternating current with a voltage of 220 V and a frequency of 50 Hz or from a built-in direct current source with a voltage of 12 ... 20 V. The time of continuous operation of the device when powered from the network is not more than 24 hours. The choice of the polarity of the measured value is carried out automatically, the choice of the measurement range and the type of the measured value is done manually. Measurement time is no more than 3 s for measuring current and voltage and 15 s for measuring DC resistance. The input resistance of the DC voltmeter is at least 20 megohm at the limit up to 200 mV and 1 megohm at the other limits. The input resistance of the AC voltmeter (active) is 1 megohm.
