Abstract: A method operating a hot cathode ionization pressure gauge during electron bombardment and resistance degas operations by controlling the degas power levels as a function of the gauge pressure. In one embodiment, the degas power level is increased and decreased in steps, and the gauge pressure monitored following each increase and decrease. In another embodiment the rate of change in the gauge pressure is monitored while the degas power level is increased. If it is determined from the monitored rate of change that the gauge pressure may exceed the upper limit, the degas power increases can be stopped or the degas power decreased. These operation are continued until predetermined final degas conditions are met. A display can be activated following the successful completion of the degas operation.

Abstract: A method for operating a hot cathode ionization pressure gauge during electron bombardment and resistance degas operations by controlling the degas power levels as a function of the gauge pressure. In one embodiment, the degas power level is increased and decreased in steps, and the gauge pressure monitored following each increase and decrease. In another embodiment the rate of change in the gauge pressure is monitored while the degas power level is increased. If it is determined from the monitored rate of change that the gauge pressure may exceed the upper pressure limit, the degas power increases can be stopped or the degas power decreased. These operations are continued until predetermined final degas conditions are met. A display can be activated following the successful completion of the degas operation.