The utility model discloses a
solid-state low-power-consumption high-precision
insulation resistance test circuit which comprises a high-
voltage access circuit, a
voltage acquisition and amplification circuit, an A / D converter, an embedded
microprocessor and an RS485
bus interface module, the high-
voltage access circuit is provided with a high-voltage optocoupler circuit, the voltage acquisition and amplification circuit is connected with a loop to be tested, and the A / D converter is connected with the embedded
microprocessor. The A / D converter is connected with the voltage acquisition and amplification circuit, the embedded
microprocessor is connected with the A / D converter and the high-voltage access circuit, and the RS485
bus interface module is connected to the embedded microprocessor through the
signal isolation driver. According to the utility model, the high-voltage optocoupler circuit is designed to replace a conventional mechanical
relay, so that faults caused by contact abrasion or damage can be reduced, and the test reliability of the initiating
explosive device is improved; meanwhile, the on time and the
off time of the high-voltage optocoupler circuit are stable, a high-
voltage source can be quickly and timely disconnected, time out-of-tolerance is avoided, and the state change of the insulation
resistor can be timely and effectively detected, so that the performance test requirement of the insulation
resistor is met.