Regulation of Ionization Gauge Emission Current to Better than 0.05%
Kenneth W. Yee, Robert J. Carpenter · Review of Scientific Instruments · 1963
A control system is described for regulating the temperature-limited emission current from the filament of an ionization gauge tube. A dc transistor circuit is used with a lamp and a photosensitive resistor to provide electrical isolation between the control and the controlled circuits. Emission currents from 10 to 0.5 mA can be maintained with a stability of better than 0.05% with the system.