Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1988-05-11
1989-09-05
Eisenzopf, Reinhard J.
Communications: electrical
Condition responsive indicating system
Specific condition
324415, 324538, G08B 2100, G01R 3102
Patent
active
048642851
ABSTRACT:
A system for testing the conditions of at least one pair of contacts to determine if the contacts are opened or closed comprising a transmit circuit and a receive circuit. The transmit circuit generates and outputs a test signal having a known frequency and the test signal is optically coupled to the contacts. The receiving circuit receives the test signal from the contacts and outputs one output indication indicating the contacts are closed in response to receiving the test signal and outputs one other indication indicating the contacts are opened in resposne to not receiving the test signal. The receiving circuit also optically couples the test signal from the contacts to the indicating means.
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patent: 4672310 (1987-06-01), Sayed
patent: 4691143 (1987-09-01), Lange
Eisenzopf Reinhard J.
Miele Anthony L.
O G & E
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