Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1981-08-05
1984-07-03
Krawczewicz, Stanley T.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324 57PS, G01R 2700
Patent
active
044581963
ABSTRACT:
A method of, and an apparatus for, high speed resistance (R), inductance (L) and capacitance (C) measurement is disclosed. A voltage or current based excitation signal having a very low voltage level and a predetermined waveform is applied to the item whose R, L or C parameter(s) is (are) to be measured; and, voltage measurements are made at predetermined points in the time domain of the output voltage waveform. Whether the excitation signal is voltage based or current based, the particular shape of the waveform (preferably trapezoidal or dual polarity rectangular wave) and the voltage measurement points in the time domain of the output voltage waveform are determined by: (i) the nature of the parameter (R, L or C) to be measured; (ii) the magnitude of the parameter (small or large) in the case of R and C parameters; and, (iii) the series/parallel nature of the parameters in situations where significant amounts of two parameters coexist in the item being measured. The measured voltage values are used to determine the value(s) of the R, L or C parameter(s). The voltage level of the excitation signal can be maintained below the activation level of contemporary printed circuit board active circuit elements (e.g., transistors), without loss of accuracy. As a result, the invention can be used to measure the R, L and C parameters of in-circuit components.
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Ichino et al.: "Vector Impedance Analysis to 1000 MHZ", HP Journal-Jan. 1980.
Avinor et al.: "Measurement of Inductance and Capacitance over Nine Decades"-Journal of Phys. & Sci. Instruments-Aug. 77-pp. 771-773-Sencore News-Jun. 1971-p. 3.
Goyal Ramesh C.
Turnbull Thomas H.
Becker Stephen A.
Ishimaru Mikio
John Fluke Mfg. Co. Inc.
Kindness Gary S.
Krawczewicz Stanley T.
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