Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1982-08-03
1985-07-09
Schreyer, Stafford D.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324 52, H04B 346
Patent
active
045284270
ABSTRACT:
The test system locates short circuits and open circuits in a two-lead line with respect to a test device inserted in the line. A first-frequency (F) detector, a second-frequency (F) generator and a predetermined voltage generator are selectively connected at a test end of the line by a switching facility. The test device comprises one or two circuits for detecting a predetermined in-line current, a circuit for detecting a predetermined in-line voltage, a supply circuit that is energized in response to the detected predetermined current or voltage, a circuit that can detect the second frequency (F) when it is supplied by the supply circuit when energized, and a switching circuit that loops the line across a first-frequency (F) generator in response to the detection of the second frequency (F). The detection of the second frequency (F) and the generation of the first frequency mean that a short circuit or an open circuit is situated in the line section between the test device and the load circuit at the other line end.
REFERENCES:
patent: 4459437 (1984-07-01), Gabry et al.
Gadonna Michel P.
Kastler Joel R.
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