Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1976-03-24
1978-06-06
Rolinec, Rudolph V.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
315106, G01N 2700
Patent
active
040939138
ABSTRACT:
A triode ionization gauge controller employing logarithmic amplifiers develops a signal proportional to the logarithm of the ratio of an ion current to the ionizing current. Gaseous thermal conductivity is employed to reduce emission current at high pressure, thereby prolonging the life of the cathode. Complete over-pressure protection is accomplished by comparing emission current with respect to a predetermined limiting current.
REFERENCES:
patent: 3058057 (1962-10-01), Frost
patent: 3230446 (1966-01-01), Liben
patent: 3576465 (1971-04-01), Harvey
Berkowitz Edward H.
Cole Stanley Z.
Herbert Leon F.
Rolinec Rudolph V.
Sunderdick Vincent J.
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