Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1976-04-15
1977-08-30
Krawczewicz, Stanley T.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324 57H, G01R 2726
Patent
active
040457281
ABSTRACT:
A direct reading inductance meter is comprised of a crystal oscillator for generating a reference frequency f.sub.r and an LC tuned oscillator for generating an initial frequency f.sub.o which, when mixed with the reference, produces a difference equal to zero. Upon connecting an inductor of small unknown value in the LC circuit to change its resonant frequency to f.sub.x, a difference frequency (f.sub.r -f.sub.x) is produced that is very nearly a linear function of the inductance of the inductor. The difference frequency is measured and displayed on a linear scale in units of inductance.
REFERENCES:
patent: 3403338 (1968-09-01), Martin
patent: 3480857 (1969-11-01), Bialko et al.
patent: 3670243 (1972-06-01), Fougere et al.
Fletcher James C. Administrator of the National Aeronautics and Space
Kolbly Richard B.
Krawczewicz Stanley T.
Manning John R.
McCaul Paul F.
Mott Monte F.
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