Loop test circuit

Details Loop test circuit Loop test circuit

1983-04-21

1985-04-23

Schreyer, Stafford D.

H04B 346

Patent

active

045131791

ABSTRACT:
A test circuit for testing tip and ring conditions of a loop circuit has three test links which exclusively turn on one of a plurality of light emitters to indicate a normal loop current, low current or polarity reversal condition. The circuit is energized by current within the loop and is mounted within an easily portable and manipulable body.

REFERENCES:
patent: 3806803 (1974-04-01), Hall
patent: 3922507 (1975-11-01), White
patent: 3941950 (1976-03-01), Dunwoodie et al.
patent: 3976849 (1976-08-01), Champan
8140 Wireless World, vol. 85, No. 1527 (1979-11), p. 91, Haywards Heath, GB, C. J. Challender: "Reference Voltage Indicator."

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