I had a problem with a Z3801A GPSDO. I added a backup battery to the
Motorola Oncore VP receiver, so it could store GPS satellite almanacs
(makes the unit come up a lot faster from an unpowered state). I used
common 1.5 volt AA alkaline batteries, two in series to the receiver.
Worked great.
The Z3801A started losing lock at random and when I was around to
witness it, it was the GPS receiver. I opened the unit up to check it
and found one of the batteries had leaked and was corroding to the other
battery lead. I cleaned the corrosion out and replaced the battery
holder with another holder, and new batteries and the unit is back up solid.
I had dated the batteries, they were over 7 years old, and they were
dated to "expire" in 2008. Of course, I could not see that from the
outside of the box.
Brian - KD4FM
On 10/25/2010 7:41 PM, paul swed wrote:
Suggest a 100K thats 33 ua and at least 10 to 60 X more then the memory
draws.
Memories in standby draw 1 ua or even far less these days.
The fact that the battery is at 3.44 and 3.2 suggests it may be fine.
I just repaired the front panel of a sig gen and the diode was shorted
draining the battery to zero because it was feeding lots of other stuff.
Gud luc
Paul
WB8TSL
On Mon, Oct 25, 2010 at 7:32 PM, J. Forster<[email protected]> wrote:
Certainly could be, but it seems a reasonable first thing to check before
tearing into the unit.
FWIW,
-John
==============bv
I expect that it is a Lithium cell, so the voltage is correct. Although,
testing it with a 1K load may not be fair as in real service I believe
they
only provide microamps. Regards - Mike
Mike B. Feher, EOZ Inc.
89 Arnold Blvd.
Howell, NJ, 07731
732-886-5960 office
908-901-9193 cell
-----Original Message-----
From: [email protected] [mailto:[email protected]] On
Behalf Of J. Forster
Sent: Monday, October 25, 2010 7:18 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] SRS SR620 counter problem
What's the battery nominal voltage supposed to be?
-John
==========
Hi everyone!
My SR620 is giving me an error 3 on power up. The manual says it's most
likely a dead backup battery.
I can clear it if I hold down the reset button while powering up. (This
loads the factory defaults into the RAM.)
However if I cycle power the error 3 comes back!
The battery reads 3.44VDC and at the VCC pin of the Ram you get 3.20VDC
with the AC power off.
This seems to indicate the battery is good.
I'm thinking of placing a 1K resistor across the battery to see if a
load
will cause a big drop.
Any suggestions?
The RAM is a CXK58257AP-70L.
Thanks,
Corby Dawson
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