PROBLEM TO BE SOLVED: To provide a probe including protection circuits capable of suppressing power-supply noise by reducing an instantaneous current and reducing the power consumption.SOLUTION: A probe includes: a plurality of signal transmission/receiving parts 1 each including protection circuits 5 and 6 for protecting a protection object circuit 4 from a high voltage signal, and a detection circuit 7 for detecting the high voltage signal and a control part 8. The control part changes over the protection circuits of the plurality of signal transmission/receiving parts between a signal passage restriction state and a signal passage permission state at same timing on the basis of detection signals output by the detection circuits of the plurality of signal transmission/receiving parts, and generates a control signal to control entry of the high voltage signal into the protection object circuit.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2017,JPO&INPIT【課題】瞬間電流を削減して、消費電力を削減し電源ノイズを抑制することができる保護回路を含むプローブなどを提供する。【解決手段】プローブは、高電圧信号から被保護回路4を保護する保護回路5、6と、高電圧信号を検出する検出回路7と、を備えた複数の信号送受信部1と、制御部8と、を有する。制御部は、複数の信号送受信部の検出回路が出力する検出信号をもとに、複数の信号送受信部の保護回路を同じタイミングで信号通過制限状態と信号通過許容状態との間で切り換えて被保護回路に高電圧信号が入るのを制限する制御信号を生成する。【選択図】図1
