Vacuum measuring ionization apparatus control

Details Vacuum measuring ionization apparatus control Vacuum measuring ionization apparatus control

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

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