Measuring and testing – Instrument proving or calibrating – Volume of flow – speed of flow – volume rate of flow – or mass...
Patent
1975-01-30
1976-04-13
Swisher, S. Clement
Measuring and testing
Instrument proving or calibrating
Volume of flow, speed of flow, volume rate of flow, or mass...
G04D 712
Patent
active
039495922
ABSTRACT:
Apparatus for measuring the running of watches comprising an oscillator delivering a precise frequency fr coupled to a divider delivering a frequency fd, the mean value of the frequency fd being synchronized on a whole number multiple n of the frequency to be measured fm, by means of an on-off comparator which delivers a voltage +V and switches the rate of division of the divider to a value of X-Y when the signal of frequency fm is ahead of frequency fd or delivers a voltage -V and switches the rate of division of the divider to X + Y when the signal of frequency fm is behind the frequency fd. The output voltage of the comparator is applied to a resistor-capacitor network in such manner to obtain the mean value of this voltage, the mean value being proportional to the relative difference of frequency ##EQU1## WHERE FMO = FR/NX.
REFERENCES:
patent: 3756066 (1973-09-01), Bollinger
patent: 3811315 (1974-05-01), Kunitomi
patent: 3817083 (1974-06-01), Jucker
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