Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Nonquantitative
Patent
1989-02-01
1990-08-07
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Nonquantitative
379 6, 379 21, 324555, H04B 346, G01R 3102
Patent
active
049471104
ABSTRACT:
To permit checking or testing the condition of a network which may carry integrated services digital, the test apparatus includes a switch which has gauged switch terminals (S, U) to operate the apparatus in selective modes. The apparatus, further, includes a local battery and a protective network (C5, 12, D1, D2, K, TF, I, II) included in circuit with test terminals (P+, P-). The switch connects the audio frequency generator to the test terminals, to the local battery, and to the local audio tone reproducer for continuity testing; if the protective circuit includes a transformer, a-c is prevented from reaching the network. In another mode, to test transmission of audio frequency through the test terminals into the network, the switch connects the audio frequency generator to the test terminals and to the local battery, to energize the audio frequency generator. Propagation of externally generated audio frequencies can be tested by setting the switch means to connect the tone reproducer including an amplifier to the test terminals, while interrupting connection from the frequency generator to the tone reproducer, and to at least one test terminal.
REFERENCES:
patent: 3870950 (1975-03-01), Laass
patent: 3872384 (1975-03-01), Laass
patent: 4039937 (1977-08-01), Laass
patent: 4163937 (1979-08-01), Laass
patent: 4323738 (1982-04-01), Merrick
patent: 4496801 (1985-01-01), Roberts
patent: 4691336 (1987-09-01), Durston
ELO-Junior Praxis: "Jubeltrompete", 1985, pp. 16 & 17.
Eisenzopf Reinhard J.
Solis Jose M.
TACO Tafel GmbH
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