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

jim_johnson at agilent.com jim_johnson at agilent.com
Fri Apr 15 17:05:41 EDT 2005

Good questions (firmware rev.)!  Yes, it's not
clear to me either - I'll have to ask him about
it again.  He has followed this thing throughout
its lifetime so if anybody would know it would
be him ... good old xxxxx.  :-)  He's gone for
the weekend so I'll check with him next week.
The 5370B is now out of support life so I'm not 
sure what could be done as far as a firmware 
upgrade by Agilent (HP is out of the picture -
they do computers, not instruments anymore!).


>-----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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