Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1975-12-08
1976-11-16
Strecker, Gerard R.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324 57Q, G01R 2922, G01R 2300
Patent
active
039926648
ABSTRACT:
The present invention discloses a method of constructing a non-reactive high frequency constant resistance unit to be used for measuring parameters of quartz crystal units described in U.S. Pat. No. 3,832,631 and U.S. Pat. No. 3,872,385. First, a non-reactive frequency of a crystal unit A is determined, a radio-frequency current is supplied to the series circuit A+ B composed of said crystal unit A and a circuit B which is adjustable to non-reactiveness, and the circuit B is adjusted so that the phase of the terminal voltage across said series circuit A+B coincides with the phase of the terminal voltage across the circuit B. Next, said crystal unit A is replaced by an element A, whose construction is similar to the said circuit B, and is adjustable to non-reactiveness, and the element A is adjusted so that the phase of the terminal voltage across said series circuit A+B coincides with the phase of the terminal voltage across the circuit B. Lastly, the construction of A is fixed, whereby said element A is always available as a substitute for A, for checking the non-reactiveness of the circuit B.
REFERENCES:
patent: 3832631 (1974-08-01), Koga et al.
patent: 3872385 (1975-03-01), Koga et al.
Kobayashi Shigeo
Koga Issac
Okamoto Isao
Kokusai Denshin Denwa Kabushiki Kaisha
Strecker Gerard R.
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