Patent ID: 6100679
Filing Date: 2000-08-08
Classification: G01R

Abstract:
A voltage indicating tool for detecting an AC voltage impressed on an electrically conductive surface, the tool comprising:an electrically conductive probe member for contacting the electrically conductive surface;a voltage detection circuit, connected to the probe member, for detecting the AC voltage when the probe member comes in contact with the electrically conductive surface;an amplifying circuit connected to the voltage detection circuit;a signal conditioning circuit connected to the amplifying circuit, the signal conditioning circuit comprising a delay circuit for delaying an indication of the AC voltage until a plurality of cycles of the AC voltage have been detected to thereby eliminate false indications that would otherwise result from detection of spurious signals and noise spikes accompanying the AC voltage, and a reset circuit for resetting the delay circuit after the AC voltage has been removed for a predetermined period of time; anda voltage indicator connected to the signal conditioning circuit for indicating the presence of the detected AC voltage to the user.