Sensor test circuit of an alarm system

Details Sensor test circuit of an alarm system Sensor test circuit of an alarm system

1983-08-29

1985-05-21

Crosland, Donnie L.

Communications: electrical

Condition responsive indicating system

With particular system function

340511, 340515, G08B 2900

Patent

active

045189528

ABSTRACT:
When a receiver supplies both an address signal and a test instruction signal to a given terminal unit, a test voltage generator forming a sensor test circuit of this terminal unit supplies a predetermined test voltage to a corresponding sensor. This sensor generates an analog signal obtained by superimposing the test voltage on the normally detected voltage. The analog signal is A/D-converted, and a resultant digital signal is received by the receiver, thereby allowing a test for operating conditions of any sensor at the site of the receiver. The test voltage generator may generate a plurality of stepwise voltage components to readily check operating characteristics (e.g., overload characteristic) of the sensor.

REFERENCES:
patent: 3973257 (1976-08-01), Rowe
patent: 3991362 (1976-11-01), Blair et al.

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