ELECTRICAL HAZARD WARNING IN AUDIO SIGNAL PROBE

摘要

An audio tone probe is used by a technician to identify a conductor carrying an applied tracing tone signal. A probe tip is positioned proximate a conductor. A mains warning circuit and a tracing circuit are provided in communication with the probe tip and a speaker is provided in communication with the mains warning and tracing circuits. Signals detected by the probe tip are provided to the mains warning circuit and the tracing circuit. The mains warning circuit determines whether a mains signal is present in the detected signal and activates a warning generator if a mains signal is present. The tracing circuit filters mains signals from the detected signals. A tracing circuit output provides a tone generating signal to the speaker for use in identifying the presence of the applied tracing tone. The probe includes a test tone generator to verify that the probe is operational.