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

[GandalfG8 at aol.com]

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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