Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1977-02-16
1977-12-06
Olms, Douglas W.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
179175, 324142, H04R 2900
Patent
active
040618919
ABSTRACT:
To determine apparent power consumption in a distributed-load, constant voltage audio distribution system, a test instrument is provided which is substituted for the amplifier in the system during the test. A constant, known AC test voltage at a convenient audio frequency is applied to the distribution system or a portion thereof. The resultant AC current passing through the distribution system is measured and read on a meter calibrated directly in watts. The apparent power consumed in the system is directly proportional to the current. The instrument is provided with an internal audio frequency oscillator as a test signal source with a provision for bypassing it so that an external oscillator may be utilized. The oscillator signal is processed by a voltage controlled amplifier and a power amplifier wherein the signal level is controlled. The processed test signal is applied to the system under test. The voltage across a resistance in series with the tested circuit is monitored through an isolating buffer. A summing amplifier connected to the buffer through an AC to DC converter has additional variable DC inputs to permit the zero adjustment and load nulling on the indicating meter connected to the output of the summing amplifier. An overload indication circuit monitors the signal applied to the meter to provide a signal indicating that another value of resistance in series with the tested circuit should be selected. A feed back loop provides a signal controlling the level of the test signal.
REFERENCES:
patent: 3947762 (1976-03-01), Hug
patent: 3959724 (1976-05-01), Chana et al.
patent: 3989908 (1976-11-01), Budrys et al.
patent: 3997724 (1976-12-01), Seebinger
Deits David H.
Kessler Kenneth S.
Mattern Jr. Roy E.
Olms Douglas W.
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