One way to determine the Ion Pump current is to measure the voltage on pin 3 of the +3500 VDC supply. This measures the voltage across the 10K resistor that is in the return line of the +3500 VDC supply and is directly related to the current flowing in the resistor.
I am in the process of 'pumping' a tube now and have been at it for about 6 weeks. Mine started at about -1.19 VDC (if I recall correctly, I am at work and do no have my notes) and wound up at about -0.62 VDC as the HV went from about +2050 VDC to about +2550 VDC at which point I got tired and attached a +4000 VDC supply to the tube via the red HV wire. It seems to slowly be moving in the right direction. Joe -----Original Message----- From: [email protected] [mailto:[email protected]]on Behalf Of Dott. Alfredo Rosati Sent: Friday, February 26, 2010 12:37 PM To: [email protected] Subject: Re: [time-nuts] 5061a with cold tube I foud missing , power at beam tube ionizer . was a diode open , now ion pump current is high . last calibration was made 20 tears ago , maybe this one was not operating for long time , due to a fault . Now I will try to apply 3500 volt as the manual . And I hope current go low . I someone had made this procedure may explain me how to do . regards i5uxj _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
