AC electrophysiological test apparatus and insurance apparatus, current display apparatus

摘要

To provide an AC current inspecting apparatus, insurance apparatus, and current display apparatus having a large surveying range and high sensitivity.SOLUTION: The AC current inspection apparatus includes a first DC power supply circuit, a second DC power supply circuit, a steady reference circuit, a minute potential sampling circuit, an AC voltage amplification circuit, a detection circuit, a calibration circuit, and a signal display. The voltage output side of the first DC power supply circuit is connected to the power supply input side of the AC voltage amplification circuit and the voltage output side of the second DC power supply circuit is connected to the power supply input side of the signal display and the voltage input side of the steady reference circuit is the second The voltage output side of the steady state reference circuit is connected to the reference voltage input side of the signal display, the micropotential sampling circuit is connected to the AC power source to be surveyed, and the sampling voltage signal output side is connected to the AC voltage amplification The output side of the AC voltage amplification circuit is connected to the input side of the detection circuit, the calibration circuit, and the signal display sequentially.BACKGROUND OF THE INVENTION