Electronic device for feeding an ion pump with two different tensions and for improved measuring of the pressure in said pump.

摘要

The device permits the ion pump (11) to be cyclically fed with two different tensions, a normal operating tension and a lower tension, at which a correct measurement of the pressure can be made in a pressure interval up to beyond 10<-><1><0> torr.
<??>This is possible through a transformer (12) whose primary or secondary winding is divided into two sections which are connected or separated by switches which ae appropriately controlled by oscillatory circuits (16, 18). Alternatively, feeding at two different tensions is obtained by feeding to the primary winding of the transformer (12) a pulsed tension having a rectangular wave form and a high frequency controlled by a field effect transistor (67) having an isolated gate.
<??>Measurement of the pressure only in the conditions of feeding at the lower tension is made possible by using a sampling and holding circuit (32).