Importance

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Abstract

A conductor tracer apparatus includes a tracer signal generator and a detector for detecting electromagnetic and electrostatic fields created by the tracer signal in the conductor. Two electromagnetic transducers in the detector obtain an omnidirectional flux reception pattern. The separate signals from the two electromagnetic transducers are both added and compared, and the comparison obtains a directionality relationship which controls the magnitude of a display indication related to the summed signal representative of the omnidirectional flux reception. An electrostatic transducer is also provided in the detector. The signal from the electrostatic transducer is added to the signals from the electromagnetic transducers to obtain reliable conductor detection even when one of the electromagnetic or electrostatic fields is adversely influenced. The tracer signal includes a low-frequency component which may be selectively sensed by the electrostatic detector in order to distinguish the single conductor of a closely adjacent group of conductors which carry the tracer signal.

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First Claim