[time-nuts] HP 5061A problem

[wa1zms at att.net]

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: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com]On
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.