[maemo-developers] [maemo-developers] Re: Measuring power consumption of 770

[From: Larry Battraw]

  I would advocate building a dummy battery out of a piece of
wood/plastic with a small piece of copper clad board (split into three
pads) to act as the contacts of the battery.  You can then run wires
from those to the real battery, passing it through whatever
resistor/sensing equipment you want.  As soon as you try measuring
what goes into the DC jack you're then including whatever losses
incurred by the DC-DC conversion from 5V to whatever used internally,
as well as issues around having it potentially trying to charge the
battery at the same time you're measuring.  That, and Igor as much as
said that things could behave differently based on whether it detects
wall/DC power vs. battery power alone.  Honestly, at this point you
probably could have built a couple rigs for measuring power from the
battery in all the time that has been spent discussing it.  :-)

Larry

On 3/21/06, Frantisek Dufka <dufkaf at seznam.cz> wrote:

> Well I was not thinking about measuring at the mains plug. I was
> thinking about measuring at the n770 side (5V?) because it is a bit
> easier then opening the device and messing with battery pins.
>
> Frantisek