Method for measuring the rate or the frequency error of a quartz

Details Method for measuring the rate or the frequency error of a quartz Method for measuring the rate or the frequency error of a quartz

1978-10-10

1980-05-06

Swisher, S. Clement

Measuring and testing

Instrument proving or calibrating

Volume of flow, speed of flow, volume rate of flow, or mass...

324 82, G04D 712

Patent

active

042010772

ABSTRACT:
A method and apparatus for measuring the frequency error of a timebase frequency of a quartz timepiece, relative to a reference frequency. An input signal having a frequency equal to the timepiece timebase frequency is produced from the timepiece. The input signal is applied to a passive quartz crystal filter having a resonant frequency equal to the reference frequency, and which filter produces an output signal in response to the input signal. The phase of the input signal and the output of the passive quartz crystal filter is compared and at least one phase comparison signal related to the phase difference of the two signals is produced. The phase comparison signal drives a meter having a dial graduated in frequency error units to display the frequency error.

REFERENCES:
patent: 2243702 (1941-05-01), Hansell
patent: 3892124 (1975-07-01), Reese
patent: 4041767 (1977-08-01), Keeler

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