Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1984-05-23
1986-11-04
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324 58R, 324 57R, 324DIG1, G01R 2706, G01R 2704
Patent
active
046212264
ABSTRACT:
Apparatus and method for determining an input electrical characteristic of a device under test by power-related measurements made by the device under test, wherein the input characteristic to be determined is related to the input impedance of the device under test. Specifically, the input impedance, the reflection coefficient, or the standing wave ratio of the input to the device under test is determined by a plurality of power, voltage, or current measurements made by a meter or sensor in the device under test. The plurality of measurements are made when the device under test is in a network including (a) a first leg having a first fixed impedance and a selectively variable impedance forming a series and (b) a second leg having a second fixed impedance and the device under test in series, an electrical input of constant amplitude being applied to the network with power being split symmetrically between the two legs. Three measurements made by the device under test when the variable impedance is selected to be in open circuit, a short circuit, and an impedance matched to the second fixed impedance are combined to provide the value of the sought input characteristic.
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patent: 4521728 (1985-06-01), Li
Eisenzopf Reinhard J.
Solis Jose M.
Weinschel Engineering Co., Inc.
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