Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1979-05-11
1981-09-15
Karlsen, Ernest F.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
32458B, G01R 2704
Patent
active
042900093
ABSTRACT:
A standing wave ratio detecting apparatus is disclosed which comprises an integration circuit for integrating a traveling wave detection voltage V.sub.F, a comparator circuit for comparing the output voltage V'.sub.F of the integration circuit with a reflected wave detection voltage V.sub.R to a voltage E.sub.o proportional to the voltage ratio V.sub.R /V'.sub.F, a control circuit receiving the output voltage E.sub.o of the comparator circuit and turned on or off according as the output voltage E.sub.o is put in a high level or in a low level to lower or raise the output voltage V'.sub.F of the integration circuit, thereby conducting such a control as making the output voltage V'.sub.F approximately equal to said reflected wave detection voltage V.sub.R and maintaining the amplitude of the output voltage E.sub.o constant, a smoothing circuit for deriving an average voltage corresponding to the ratio V.sub.R /V.sub.F of the reflected wave detection voltage V.sub.R to the traveling wave detection voltage V.sub.F from the output voltage E.sub.o of the comparator circuit, and a meter for indicating the average voltage from the smoothing circuit.
REFERENCES:
patent: 3678381 (1972-07-01), Beaudry
patent: 3842358 (1974-10-01), Frazier
patent: 4041395 (1977-08-01), Hill
Fujii Tadaaki
Sanpei Konomu
Hitachi , Ltd.
Karlsen Ernest F.
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