A SIMPLIFIED IONIZATION GAUGE CIRCUIT

Abstract
By measuring the ratio of ion current to electron current present in the usual ionization gauge, an extremely stable circuit has been developed, comparing favorably with standard circuits. A simple calibration made during construction makes this gauge direct reading. The circuit may be used for outgassing the gauge, and for leak hunting, being very sensitive in this respect. It incorporates a safety cutoff. It has relatively few controls, and is extremely cheap. For several months we have operated gauges in this laboratory with several types of circuit, and find that the one described in this paper is simpler and more rugged although just as useful and versatile as our modified Rainwater instrument.

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