[time-nuts] SRS SR620 counter problem/Battery

[paul swed]

Oh I did not realize it had batteries in it. I need to check mine or whats
left of it.
Always seemed to take a while to come up.

On Mon, Oct 25, 2010 at 9:05 PM, Brian Kirby <kilodelta4foxmike at gmail.com>wrote:

> 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<jfor at quik.com>  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: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] 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
>>>>> ____________________________________________________________
>>>>> SHOCKING: 2010 Honda Civic for $1,734.09
>>>>> Is this price real? YES! We reveal the TRUTH!
>>>>> http://thirdpartyoffers.juno.com/TGL3141/4cc60781dcc8a5aca4m04duc
>>>>>
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>>>>>
>>>>
>>>>
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