Apparatus for measuring the rate of an analog-display electronic timepiece
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United States of America Patent
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Oct 6, 1981
Grant Date -
N/A
app pub date -
Nov 26, 1979
filing date -
Nov 24, 1978
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An electronic measuring apparatus for measuring the rate of an analog-display electronic watch which comprises a quartz oscillator, a frequency divider with an adjustable division factor, a stepping motor and a circuit which, when the stem of the watch is pulled, produces a measuring signal emitted by the stray field of the coil of the stepping motor and comprising trains of pulses whose period and content are respectively representative of the frequency of the oscillator and the division factor. The measuring apparatus comprises a pick-up means for detecting said measuring signal, circuits for computing the rate of the watch and means for displaying said rate.
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