Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Balancing
Patent
1976-09-07
1978-02-21
Mullins, James B.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Balancing
324111, 324119, G01R 1706, G01R 1922
Patent
active
040755584
ABSTRACT:
The average amplitude of an incoming signal voltage of variable frequency is measured by half-wave rectification of that signal voltage to produce a pulsating current which is subtracted from a continuous current in the input of an integrating amplifier. The fluctuating output voltage of this amplifier is periodically sampled, once per cycle of the signal voltage, to provide a train of corrective pulses. These pulses are accumulated to provide a reference voltage fed to a differential amplifier which controls the continuous current in response to differences between this reference voltage and a feedback voltage proportional to that current to compensate for changes in average signal amplitude. The magnitude of the continuous current, read by a meter, is therefore a measure of the desired amplitude. The voltage samples may be weighted, in proportion to signal frequency, by a variable-gain amplifier or a sampling switch closed for different periods in the output of the integrating amplifier referred to. A second integrating amplifier, in cascade with the first one, may receive the voltage samples and store them on one of two series-connected condensers in its feedback circuit, the other of these condensers being periodically discharged and serving only to accelerate the response of the system to changes in amplitude and/or frequency of the input voltage.
REFERENCES:
patent: 3571706 (1971-03-01), Bjor
Goltermann Wandel U.
Karlsen Ernest F.
Mullins James B.
Ross Karl F.
LandOfFree
Method of and system for metering a periodically varying voltage does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method of and system for metering a periodically varying voltage, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of and system for metering a periodically varying voltage will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-128769