[time-nuts] Difference between HP 5370A and 5370B

Dr. David Kirkby drkirkby at medphys.ucl.ac.uk
Tue Apr 26 11:32:55 EDT 2005

Thanks for that. I belive my model is quite late. I forgot the S/N, but 
I have posted it here. Someone commented it was a late model, and 
ManualsPlus did not have a manual that covered such a model, so 
hopefully I will not have the problem.

jim_johnson at agilent.com wrote:
> Hi David,
>    Apparently the GPIB fix occurred in the
> 5370B models only and as far as he knows, there
> could be some units out there with "bad" firmware
> in them and some with the GPIB fix.  The problem
> still remains where they didn't change the firmware
> revision number so there's no way to confirm it
> one way or the other, besides having your GPIB hang
> up on you.  Sorry, but that's about the best that
> can be done on this issue.  I hope your 5370B is
> a later model that has the fix in it!
> Regards,
> Jim
>>>-----Original Message-----
>>>From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com]On
>>>Behalf Of David Kirkby
>>>Sent: Friday, April 15, 2005 1:52 PM
>>>To: Discussion of precise time and frequency measurement
>>>Subject: Re: [time-nuts] Difference between HP 5370A and 5370B
>>>jim_johnson at agilent.com wrote:
>>>>Hi again David,
>>>>   I talked to xxxxx this morning and here's what
>>>>he said:
>>>>The 5370B has a different processor board than the
>>>>"A" model, with on-board RAM (the "A" had a separate
>>>>RAM board).  The "B" has had an upgrade to its DAC
>>>>board.  The "B" has a different input module that is
>>>>more stable than in the "A".  The firmware has had an
>>>>upgrade in the "B", as the HPIB (GPIB) would occasionally
>>>>hang up in the "A" model.  The bad news is that the
>>>>newer firmware carries the same rev. number as the old one
>>>>so you can't easily tell which one you have installed.
>>>I'm slightly lost there. You seem to be implying the B's have newer 
>>>firmware than the A's, but then saying its not easy to tell if 
>>>you have 
>>>the new firmware, since the revision is the same. If the newer 
>>>was installed only in B's, then all you would need to do is 
>>>look at the 
>>>model number. Clearly then I assume either some B's have the old 
>>>firmware, or some A's have the new firmware, or perhaps HP 
>>>would update 
>>>an A to a B firmware.
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Dr. David Kirkby PhD CEng MIEE,
Senior Research Fellow,
Department of Medical Physics,
Mallet Place Engineering Building,
Gower St,
University College London,
London WC1E 6BT.

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