Phasor impedance measuring test set
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United States of America Patent
Stats
-
Sep 13, 1983
Grant Date -
N/A
app pub date -
Apr 8, 1981
filing date -
Apr 8, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Test set apparatus for measuring the phasor impedance of a circuit under test, such as a telephone line. The test set apparatus also calculates for display the return loss of a circuit under test, against predetermined values of resistance or certain RC networks. To measure phasor impedance, the test set apparatus includes a signal generator providing a measurement frequency signal to a constant current source having an individual battery power source. The current source is connectable to measurement terminals, which provide for connection of a circuit under test, and produces measurement current flow through the circuit under test. During an impedance measurement, the battery-powered current source is connected to the measurement terminals and isolated from ground, thereby permitting operation of the test set apparatus to measure the impedance to a balanced circuit in the presence of externally-induced longitudinal voltages.
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