[time-nuts] HP5065a cfield issue

[Bob kb8tq]

Hi

Just double checking….. Are we still after a change went past 1/3 of the pot range? 

Can we get the pot back to the original location and measure the frequency offset
(even if only in a crude fashion)? 

Best guess is still that this should be a ppb or more of shift. If it’s down in the
4x10^-11 range then indeed, there’s something off in the C Field setup.

Bob

> On Dec 2, 2020, at 2:03 PM, paul swed <paulswedb at gmail.com> wrote:
> 
> Corby will check. Though in looking at the cfield circuits it does appear
> all to be correct. Its some other odd offset that has crept in.
> Thanks
> 
> On Wed, Dec 2, 2020 at 1:56 PM <cdelect at juno.com> wrote:
> 
>> Paul,
>> 
>> One other thing to check.
>> 
>> Put a DC coupled scope on the C-field pot wiper and rotate the pot back
>> and forth.
>> 
>> Make sure there are no jumps or noise.
>> 
>> Sometimes the pot gets noisy in a section.
>> 
>> Rotating it back and forth across the bad sections will usually clean it
>> up.
>> 
>> Cheers,
>> 
>> Corby
>> 
>> 
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