FWIW, I'd just let it run. -John
============= > Morning update. > > The voltage on pin 4 is now -1.082 VDC and the HV is up to 2118 VDC. The > +3500 V power supply is not 'hot' and therefore, there appears to be > progress. > > Thanks for all the suggestions. I like the idea of the multiplier. I've > known about these but never knew they had a name and had forgotten about > that approach. All I have to do now is o see if I have a suitable > transformer in my junk pile. We'll see what happens first, the tube pumps > down or I get around to building the power supply. > > Joe > > -----Original Message----- > From: [email protected] [mailto:[email protected]] On > Behalf Of J. L. Trantham > Sent: Saturday, January 16, 2010 9:32 PM > To: 'Discussion of precise time and frequency measurement' > Subject: Re: [time-nuts] 4 KV Power Supply Recommendations > > > Sorry, TIA. > > I was monitoring pin 4, not pin 3. Pin 3 is -1.129 VDC which would imply > a > current of 112.9 uA. > > I will watch overnight and see what happens. > > Any thoughts appreciated. > > Joe > > -----Original Message----- > From: [email protected] [mailto:[email protected]] On > Behalf Of J. L. Trantham > Sent: Saturday, January 16, 2010 9:02 PM > To: [email protected] > Subject: [time-nuts] 4 KV Power Supply Recommendations > > > I have a 5061A That I am trying to bring on line and it pegs the Ion Pump > I > meter reading. Measuring the voltage at pin 3 of the +3500V power supply, > I > get -0.275 VDC. This is across a 10K resistor and suggests that CS tube > current is 27.5 uA. The voltage from the power supply with the tube > connected is 2050 VDC and around 3100 VDC with the tube disconnected. > > It is recommended to connect the tube to an external 3500 VDC supply > capable > of 5 mA and let it run to see if the current will come down. Having > watched > the voltage on pin 3 during the day, it has come down to -0.269 VDC and > the > voltage with the tube connected has gone up to around 2075 VDC. > > Any thoughts on a source for an external HV power supply for this > application? > > Any thoughts on whether to just let it sit for a week or two to see if it > 'pumps down'? > > Any thoughts on other things to try? > > Thanks, > > Joe > > > _______________________________________________ > 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. > > > _______________________________________________ > 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.
