[PLUG] Intrusion detection on desktop

[Denis Heidtmann]

On Sat, Jun 7, 2014 at 9:10 PM, Neal <nsedell at gmail.com> wrote:
> On Sat, Jun 7, 2014 at 1:40 PM, Denis Heidtmann <denis.heidtmann at gmail.com>
> wrote:
>
>> Galen suggested measuring the current through the intrusion jumper
>> might help illuminate the random halts. I have measured that current
>> as best I could.  It appears to be about 0.1uA, the least count of my
>> Fluke 87.
>>
>> I calculate that the CR2032 should last 250 years at this current, so
>> I do not know why it is set so low.  10 uA would be too high, yielding
>> only 2.5 years battery life.
>>
>
> The battery drain is 0.1uA or the intrusion detect jumper is 0.1uA?

The latter.  That comes from the battery when the computer is has no line power.

>  I would expect the battery current to be a lot closer to 10uA, but only
> with the power supply AC cord unplugged or hard-switched off if your power
> supply has a master switch on the back of it.

With no AC, what does the 10 uA go to?  The RTC and the BIOS memory
plus anything else?  So this means that I should be checking the
battery every couple of years.  (Unlike  most on this list, I power
off my machine when no one is using it, which is a significant part of
the time.)

>
> With the computer running the battery current should be ~zero, and the
> battery lasts whatever its shelf life is, probably ten years.

Agreed.

>
> NealS

-Denis