[time-nuts] HP5370A self test fault characteristics and diagnosis

Rex rexa at sonic.net
Fri Jun 19 03:46:53 EDT 2009


Bruce,

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 
look for.


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
>recently developed.
>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:
>
>http://www.ko4bb.com/~bruce/HP5370_Faults.html
><http://www.ko4bb.com/%7Ebruce/HP5370_Faults.html>
>
>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
>above page.
>Whilst it is possible to obtain good quality images with less precise
>multiaxis positioner than those used, at least it is very easy using
>such equipment
>The chip image confirms the diagnosis inferred from measurements of
>various signals within the 5370A.
>
>Replacing A22U21 cured the problem,
>
>Bruce
>
>
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