Method for measuring the rate or the frequency error of a quartz timepiece and measuring apparatus for carrying out this method
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United States of America Patent
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-
May 6, 1980
Grant Date -
N/A
app pub date -
Oct 10, 1978
filing date -
Oct 10, 1977
priority date (Note) -
Expired
status (Latency Note)
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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.
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