Dual demodulating circuit tracer
First Claim
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1. A non-intrusive circuit tracer for idendifying a conductor in the presence of one or more unrelated conductors in a bundle, comprising:
- first and second input probes adapted to induce an electrical signal into first and second conductors respectively;
means for generating a tracer signal of a predetermined frequency;
means for alternately connecting said tracer signal to said first and second probe at a predetermined rate of alternation so as to alternately induce said tracer signal into said first and second conductors;
pick-up probe means for sampling electrical signals present in said first conductor at a point remote from said input probes;
means for providing a first intermediate signal by half wave synchronously demodulating said sample signal with respect to the frequency of said tracer signal;
means for providing a second intermediate signal by full wave synchronously demodulating said first intermediate signal with respect to said rate of alternation of said tracer frequency; and
,means for indicating a coincidence between one output state of said second intermediate signal and the presence of alternated tracer signal on said first conductor.
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Abstract
A non intrusive circuit tracer for positively identifying a conductor at ition remote from a point of injection of a test signal. Tracer signal is alternately injected into two conductors at a rate of alternation which is substantially less than the tracer frequency. At another point along the conductor signal is sampled and synchronously demodulated first with respect to the tracer frequency and then with respect to the rate of alternation of the tracer frequency between conductors.
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6 Claims
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1. A non-intrusive circuit tracer for idendifying a conductor in the presence of one or more unrelated conductors in a bundle, comprising:
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first and second input probes adapted to induce an electrical signal into first and second conductors respectively; means for generating a tracer signal of a predetermined frequency; means for alternately connecting said tracer signal to said first and second probe at a predetermined rate of alternation so as to alternately induce said tracer signal into said first and second conductors; pick-up probe means for sampling electrical signals present in said first conductor at a point remote from said input probes; means for providing a first intermediate signal by half wave synchronously demodulating said sample signal with respect to the frequency of said tracer signal; means for providing a second intermediate signal by full wave synchronously demodulating said first intermediate signal with respect to said rate of alternation of said tracer frequency; and
,means for indicating a coincidence between one output state of said second intermediate signal and the presence of alternated tracer signal on said first conductor. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification