Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1975-12-31
1977-07-12
Rolinec, Rudolph V.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324140D, 324 78D, 315108, G01N 2700, G01K 700
Patent
active
040357201
ABSTRACT:
In the ion gauge system disclosed herein, the ion current obtained from an ion gauge tube is directly converted to a signal having a frequency proportional to the ion current so that a digital measurement of vacuum may be obtained. The ion current charges an integrating capacitor which is periodically discharged after reaching a preselected threshold. Preferably, the threshold is adjusted in proportion to the ion gauge emission current so that automatic compensation for variation in the emission current is obtained, the output frequency being proportional to the ratio of the ion current to the emission current. The variable frequency output signal generated by the integration and discharge process is counted by a scaling circuit which automatically changes the timing interval to provide the desired number of significant figures while incrementing the exponent value in a scientific notation display in keeping with the active time base.
REFERENCES:
patent: 3239715 (1966-03-01), Lafferty
patent: 3446958 (1969-05-01), Cambou et al.
patent: 3500190 (1970-03-01), Michon
patent: 3502983 (1970-03-01), Ingle et al.
patent: 3707675 (1972-12-01), Krechmery et al.
Rolinec Rudolph V.
Sunderdick Vincent J.
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