Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1983-01-17
1984-12-25
Krawczewicz, Stanley T.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
G01R 3102, G01R 3106
Patent
active
044906714
ABSTRACT:
An apparatus and method for determining the number of turns on a sample coil are disclosed. An alternating current of substantially constant amplitude is passed through a primary winding turn which is coupled to the sample coil and also through a primary winding turn which is coupled to a standard coil of known turns count, inducing currents in the sample coil and in the standard coil in inverse proportion to their respective turns counts. These induced currents are commutated into pulsating direct currents that are fed into a ratiometric current meter. This meter produces a measurement output corresponding to the ratio of the current induced in the standard coil to the current induced in the sample coil. This measurement output is displayed on a calibrated readout device as an indication of the number of turns on the sample coil. In addition, means are provided for indicating coil discontinuity and inverted coil phase.
REFERENCES:
patent: 1972243 (1934-09-01), Nolke
patent: 2914729 (1959-11-01), Thompson
patent: 3701008 (1972-10-01), Kusters
patent: 4241306 (1980-12-01), Bump
patent: 4439724 (1984-03-01), Morong
Moore: "Direct Reading Ratio-Error . . . of Current Transformers", IEEE Trans. on Inst. & Meas.-vol. IM-19, No. 3, Aug. 1970, pp. 161-166.
Krawczewicz Stanley T.
Kriegsman Irving M.
Solis Jose M.
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