> measure the power consumption only when running on battery?
>
Either use e.g. Intels powertop when running on battery only or measure on
the DC-side of the poweradapter when running on line - but remove the
battery.


> Right now, the powermeter is showing good results - the power consumption
> is
> alternating between 4 W and 25 W.

Strange, a Core2Duo-Thinkpad should consume above 8W when idle (HD &
Backlight off). Plus around 30-40% on the AC side due to bad low-power
efficiency of the power
supply.<http://dict.leo.org/ende?lp=ende&p=eL4jU.&search=effectiveness>



> Might it be that the powermeter gets confused after a while because of the
> harmonics of the frequencies ? It was a quite cheap one, about 15,- Euro.
>
Exactly!


Regards
 Mark

-- 
http://brightsblog.wordpress.com
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