Conductor tracer with improved current regulating transmitter

Details Conductor tracer with improved current regulating transmitter Conductor tracer with improved current regulating transmitter

1987-02-09

1989-02-14

Strecker, Gerard R.

Electricity: measuring and testing

Conductor identification or location

Inaccessible

323315, G01R 3102, G05F 316

Patent

active

048049077

ABSTRACT:
A conductor tracer which is used to trace and identify an energized conductor includes a transmitter which draws a current tracing signal from the energized conductor. The magnitude of the current drawn is regulated substantially independently of the voltage on the conductor. A current regulating circuit is periodically switched to conduct current from the energized conductor. The constant current circuit responds both to the current drawn and the voltage on the conductor. At relatively high voltages the current is conducted primarily through passive resistive elements which can absorb the relatively high power and dissipate it as heat. At relatively low voltages, a current regulating transistor regulates the amount of current drawn. At relatively low voltages on the conductor the regulating transistor does not experience damaging heat.

REFERENCES:
patent: 3114872 (1963-12-01), Allard
patent: 3255402 (1966-07-01), Vollnhals
patent: 3769572 (1973-10-01), Doubt
patent: 3810003 (1974-05-01), Portoulas
patent: 3829765 (1974-08-01), Siler
patent: 4021730 (1977-05-01), Brinegar
patent: 4114092 (1978-09-01), Fry, Jr.
patent: 4121152 (1978-10-01), Hale et al.
patent: 4399399 (1983-08-01), Joseph
patent: 4491785 (1985-01-01), Pecukonis
patent: 4642556 (1987-02-01), Pecukonis

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