DAC-PD-7 is designed to reduce complicated tasks (calibration, wiring, and evaluation) with Partial Discharge (PD) measurements, so that can test PD promptly and easily without the expert knowledge. DAC-PD-7 alone allows all of the tests on PD without peripheral equipment. DAC-PD-7 can easily realize the test of PD on print-circuit boards, connectors, semiconductors, small motors and other insulation materials, to make a judgment on good or bad of them.