Measuring and testing – Instrument proving or calibrating – Volume of flow – speed of flow – volume rate of flow – or mass...
Patent
1976-10-18
1977-08-16
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
040417670
ABSTRACT:
Timing apparatus is provided for use in calibrating a wristwatch whose timing accuracy depends on the oscillation frequency of an electrical oscillator in the wristwatch. Electrical energy radiated from the wristwatch is picked up and in response there is produced a first periodic signal whose fundamental frequency depends on the oscillation frequency. In response to the first periodic signal there is produced a second periodic signal. The first and second periodic signals have the same fundamental frequency, but a frequency-dependent phase-shifting circuit causes a phase shift to be defined between the first and second periodic signals. The amount of this phase shift depends on the frequency difference between the equal fundamental frequencies and a predetermined standard frequency. An indicator is provided, and a phase-difference detecting circuit arrangement causes the indicator to display an indication of said frequency difference.
REFERENCES:
patent: 2896161 (1959-07-01), Fox
patent: 3255625 (1966-06-01), Ellison
patent: 3305776 (1967-02-01), Duncan, Jr. et al.
Harrison Michael R.
Keeler Eugene R.
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