Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Plural inputs
Patent
1979-03-12
1981-12-01
Karlsen, Ernest F.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Plural inputs
324 83A, 324115, G01R 2106, G01R 2500
Patent
active
043038816
ABSTRACT:
A multi-function alternating current meter having a voltage probe and clamp type current probe for sampling voltage and current of a alternating current line without physically breaking into the line. Components include the two input probes which are connected to a squaring circuit and compensated low pass active filters which are arranged for feeding the respective output signals into an analog summing amplifier. Subsequently the signals are fed into a calibrated output indicator. A scaled multiplier and phase lead/lag detector are included in the circuit. Switches are capable of rerouting the input signals through various components, and the various outputs are individually applied to the calibrated output indicator to indicate the A.C. line's power factor, phase angle, true power, apparent power, voltage, current, or lead/lag status, as selected.
REFERENCES:
patent: 2577992 (1951-12-01), Armstrong
patent: 3084863 (1963-04-01), Du Vall
Florman, E. F.; "An Electronic Phasemeter"; Proc. of the I.R.E.; Feb. 1949; pp. 207-210.
Czerwien Arthur S. A.
Feyer Heinz E.
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