Anti-interference direct current resistance testing device
A technology of DC resistance testing and standard resistance, which is applied in the direction of measuring devices, measuring resistance/reactance/impedance, components of electrical measuring instruments, etc., and can solve the problems of inability to complete line DC resistance testing, personal induction accidents, test data deviations, etc. problems, to achieve the effect of safe and convenient test wiring, strong field applicability, and strong practicability
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[0023] Such as figure 1 As shown, the DC constant voltage and constant current source is connected to the impedance matching unit; the impedance matching unit and the data test calculation unit are respectively connected to the standard resistance and the measured resistance sampling unit, the relay test action unit and the interference voltage detection unit; the data test calculation unit is connected to a display unit; the display unit is connected to the keyboard and the overvoltage protection unit; the keyboard and the overvoltage protection unit are connected to the storage and printing unit.
[0024] Such as figure 2 As shown, the DC constant voltage and constant current source is that the EMI filter circuit is connected to the rectification filter circuit I, the rectification filter circuit I is connected to the isolation transformer and the PWM control circuit, the isolation transformer is connected to the rectification filter circuit II, and the rectification filter...
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