[time-nuts] Lucent KS-24361, HP/Symmetricom Z3809A, Z3810A, Z3811A, Z3812...

Bob Camp kb8tq at n1k.org
Sun Nov 2 15:35:49 EST 2014


Hi

The numbers quoted earlier (and they sound right) were 20 uA at 2.5V. That would be well under your 100uA. My *guess* is that self discharge / aging on a normal AA is going to limit things faster than a 20 uA drain. 

Now, if you have the more normal tiny coin cell involved with  1/10 or 1/100 that capacity and much lower self discharge ….

Bob

> On Nov 2, 2014, at 3:17 PM, Hal Murray <hmurray at megapathdsl.net> wrote:
> 
>> By the way the z3801 is off most of the year so the drains quite small.
> 
> I think that's backwards.  The battery is only used when there is no power to 
> the GPS module.
> 
> AAs are roughly 2800 mA hours.  There are 8760 hours in a year.  That's 319 
> microamp years.  (How's that for a SI unit?)  So that's 3 years if your GPS 
> module takes 100 uA.  I think that's way high.  Anybody measured it?  There 
> is probably a strong temperature component.
> 
> 
> -- 
> These are my opinions.  I hate spam.
> 
> 
> 
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