[time-nuts] Re: Question: Re: 5061A HV Supply, et al. {External}

[rodger_adams at yahoo.com]

FYI, on my "dirty tube" that the internal supply couldn't pump down.  When I connected it to the external ION power supply, which I had previously tested to make sure it's metering was reasonably accurate, initial current draw at 3500 v was 88 ua.  (fortunately, I kept records)  3 days later it was down to 55 ua.  It never got below 52 ua a few more days later.  I hooked it back up to the internal pump power supply and ion current was low enough that the 2500 volt power supply came up and it worked.  

My guess is the issue is some combination of not enough current capability for the A18 and it's internal metering is not quite right.

Rodger

-----Original Message-----
From: paul swed via time-nuts <time-nuts at lists.febo.com> 
Sent: Tuesday, November 15, 2022 11:43 AM
To: Lester Veenstra <m0ycm at veenstras.com>
Cc: Discussion of precise time and frequency measurement <time-nuts at lists.febo.com>; paul swed <paulswedb at gmail.com>
Subject: [time-nuts] Re: Question: Re: 5061A HV Supply, et al. {External}

100-300 ua. The actual ion pump is maybe 50 ua. A cruddy tube needs more to clear it.

On Tue, Nov 15, 2022 at 11:24 AM Lester Veenstra <m0ycm at veenstras.com>
wrote:

> For the external ion pump, what would be a safe maximum current to 
> allow the external supply be limited to, say at short circuit on the output?
>
> Lester B Veenstra  K1YCM  MØYCM  W8YCM   6Y6Y W8YCM/6Y 6Y8LV (Reformed
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