[time-nuts] Lucent KS-24361, HP/Symmetricom Z3809A, Z3810A, Z3811A, Z3812...
GandalfG8 at aol.com
GandalfG8 at aol.com
Sun Nov 2 20:54:01 UTC 2014
Hi Bob
The UT+ data sheet from 1998 quotes an external backup supply of 2.5 to
5.35V with a drain of 5uA typical at 2.5 Volts.
Regards
Nigel
GM8PZR
In a message dated 02/11/2014 20:41:44 GMT Standard Time, kb8tq at n1k.org
writes:
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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