[time-nuts] HP5370A self test fault characteristics and diagnosis
rexa at sonic.net
Fri Jun 19 03:46:53 EDT 2009
I've never seen you post a new thread as a response to an existing,
unrelated thread, as you've done here. You are not the first to do this,
but I thought you might be aware of these subtleties.
In the spirit of quasi-related posts...
On the 5370A part, I recently bought one cheap and it sort of works but
seems very noisey in its lower order digit readings; clean external ref
doesn't help. I haven't looked at obvious things like the power supply
yet, but I'm curious if the group has any thoughts of common problems to
Bruce Griffiths wrote:
>For the benefit of HP5370A and/or HP5370B users I have added a webpage
>detailing the characteristics and diagnosis of a fault that my HP5370A
>With the 10MHz rear panel output connected to both inputs it developed
>an overange error when set to measure the time delay between the START
>and STOP inputs.
>Details are on the web page:
>At Didier's suggestion I've also included a link detailing the imaging
>setup and camera settings etc used to acquire the chip image on the
>Whilst it is possible to obtain good quality images with less precise
>multiaxis positioner than those used, at least it is very easy using
>The chip image confirms the diagnosis inferred from measurements of
>various signals within the 5370A.
>Replacing A22U21 cured the problem,
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