[time-nuts] 5071 Firmware info

Dave Carlson dgcarlson at sprynet.com
Sun Oct 23 01:51:39 EDT 2005


True that you could benefit, but usually the rule is "not broken, don't
fix". Your example of the 4433 revision is a case in point. The Ion Pump
late start is a phenomenon in the early life of a CBT and not one that would
be expected to
plague a unit in operation for a few weeks or longer. So if it's been
running just fine for months with a pre-4433, then again no reason to take
it off line and upgrade.


----- Original Message ----- 
From: "RMelkers" <RMelkers at DirecWay.com>
To: "'Discussion of precise time and frequency measurement'"
<time-nuts at febo.com>
Sent: October 21, 2005 6:39 AM
Subject: RE: [time-nuts] 5071 Firmware info

Thanks for the quick response!
The portion that deals with "health monitor detects and reacts to different
possible error and non-error events" is a valid area for me to look at and
be concerned with. (The 5071A's that I deal with are used to feed a
Disciplines Frequency standard (DFS),  and configured in a Primary/Standby
mode, So taking one down during a training session, while I'm onsite, isn't
that big of a deal.)

In some of the few firmware versions paperwork I've been able to look at, it
also reduces the false error/death reports.

For example Firmware revision:433 "This revision improves immunity to
changes in the Ion pump current that could cause interruption of operation."

The prevention of, or reduction of, "interruption of operation" could be
considered a valid reason to perform this firmware upgrade.

I've have paper work from a cesium that was sent to the manufacture for a
"overhaul and Calibration", and came back with firmware version X.3249!

I do agree that just a name change is not a valid reason to change out
anything. (Except maybe a marriage license!)


-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Dave Carlson

Subject: Re: [time-nuts] 5071 Firmware info


None of the FW upgrades have any effect on the stability or accuracy of the
5071A. So you're correct. However each revision has had some minor change in
the way the health monitor detects and reacts to different possible error
and non-error events. Each new CBT that is shipped out has a set of the
latest ROMS included as an encouragement to upgrade at that time.

The most recent FW change was simply to remove "Agilent" and insert
"Symmetricom"  into the ID string. Certainly no reason to interrupt a
working primary standard just for the upgrade.

Dave Carlson

----- Original Message -----
From: "RMelkers" <RMelkers at DirecWay.com>
Sent: October 20, 2005 1:56 PM
Subject: [time-nuts] 5071 Firmware info

  Has there been any luck in finding out what each firmware revision on the
5071A accomplished?
Of the 41 that I personally deal with, most have quite an old firmware
installed. I have been pursuing this information for quite some time, with
no luck.

Without this information, I do not see a reason to upgrade any firmware in
these Cesium clocks, Nor could I really recommend doing this in the future.
(Why take a pill, if you don't know what it's for?")

Raimond Melkers
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