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

Daun Yeagley daun at yeagley.net
Tue Apr 26 12:25:52 EDT 2005

Hi Jim

I'm wondering that if we were to find an example of a known "good" unit as well
as a bad one, that we could look at the EPROMS to determine any defenses and
then clone the good ones.  That would be one way to save David if he gets a
"bad" one.


-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com]On
Behalf Of jim_johnson at agilent.com
Sent: Tuesday, April 26, 2005 12:18 PM
To: time-nuts at febo.com
Subject: RE: [time-nuts] Difference between HP 5370A and 5370B

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!


>>-----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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