Possibly, but from what I remember, the real issue is erosion of the EM dynode surfaces from the high level of ion bombarment, resulting in reduced output and lower S/N, and eventually such low multiplication that the tube is considered 'failed'.
Bill Ezell ---------- They said 'Windows or better' so I used Linux. [EMAIL PROTECTED] wrote: > Per the last statement in the message below: > > "The danger running without a working ion pump, though, is that at > eventually you'll damage the electron multiplier." > > Is it correct to presume then that the EM becomes covered in > "cesium splatter" and thus the S/N output gets poor? > > -Brian, WA1ZMS > > > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] > Behalf Of wje > Sent: Monday, August 18, 2008 1:43 PM > To: Discussion of precise time and frequency measurement > Subject: Re: [time-nuts] HP 5061A problem > > > If you install the second unit, your 5061A still won't work. +20v at the > sensor output will signal the ion current monitor to shut down the > electron multiplier supply. > > If you have some high-value resistors around, can you make up a test > 200M resistor string? If so, see what happens when that's connected > across 4 & 5 of the first 3500 v supply. > > However, even with the failure case you describe with the first unit, > I'd expect your 5061A to still work at least for a short time. Do you > have beam current? If not, you might have other problems as well. Check > the voltage at A15 pin 4. You should have +18 v or so. If not, more > troubleshooting is in order. > > > > Bill Ezell > ---------- > They said 'Windows or better' > so I used Linux. > > > _______________________________________________ > 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.
