POWER SUPPLY INSPECTION DEVICE AND PROBE

PROBLEM TO BE SOLVED: To provide a power supply inspection device in which the difference in the voltage and the switching ripple voltage of a DV power source is not large between when a measurement is being made and when a measurement is not being made, and a probe which can appropriately measure the voltage of the DC power source.SOLUTION: An A/D conversion circuit 12 converts a power source voltage of a DC power source 2 input from a measurement terminal 71 from an analog signal to a digital signal, using the electricity stored in a battery 32. An operation unit 14 determines the presence of degradation of the DC power source 2 based on a plurality of digital signals obtained from an A/D conversion circuit 12.SELECTED DRAWING: Figure 1 【課題】測定時と非測定時とで、ＤＣ電源の電圧およびスイッチングリップル電圧の差が大きくならないようにできる電源検査装置、およびＤＣ電源の電圧の適切な測定ができるプローブを提供する。【解決手段】Ａ／Ｄ変換回路１２は、バッテリ３２に蓄積された電力を用いて、測定端子７１から入力されたＤＣ電源２の電源電圧をアナログ信号からデジタル信号に変換する。演算部１４は、Ａ／Ｄ変換回路１２から得られる複数のデジタル信号に基づいて、ＤＣ電源２の劣化の有無を判定する。【選択図】図１