Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – With rectifier
Patent
1989-01-06
1992-08-11
Karlsen, Ernest F.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
With rectifier
324 95, 324127, 455115, G01R 1922, H04B 1700
Patent
active
051382547
ABSTRACT:
A removable alternating current measuring circuit provides for measuring radio frequency currents produced in an AM transmitter-antenna system without draining any power from the system. A transformer couples the transmitter-antenna system with the current measuring circuit, which includes a first and second half wave circuits for operation during the positive and negative half cycles of alternating current. During the positive half cycle, a first diode directs current through a first load resistor and through a series combination including a second load resistor and a direct current meter. During the negative half cycle, a second diode in opposition to the first diode directs current through the second load resistor and through a series combination including the first load resistor and the current meter. Current always flows through the meter in the same direction. The component values are chosen so that the current measured is independent of diode offset characteristics or temperature variation without extracting any power from the transmitter-antenna system.
REFERENCES:
patent: 977061 (1910-11-01), Wiler
patent: 1887421 (1932-11-01), Newman
patent: 2134589 (1938-10-01), Stanek
patent: 2231737 (1941-02-01), Rutter
patent: 2238298 (1941-04-01), Wehrlin
patent: 2905899 (1959-09-01), Miller et al.
patent: 3311826 (1967-03-01), Galman
patent: 3914689 (1975-10-01), Wright
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