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

[From: Teemu Nikkilä]

On Tuesday, 14. March 2006 22:42, Claudio Scordino wrote:
> > Why don't you just wire a battery to the battery pins and connect your
> > meters to these wires?

I'd investigate this approach, maybe even building a battery "emulator" - a 
good quality 3.7 V regulated voltage source, if this is enough to fool the 
charging circuit.

>
> The voltage and the current provided by the battery is much different from
> the values provided by an electric cable connected to a socket (220V and
> 50Hz here in Italy).
> That's why our measurement tools wouldn't work with such a small current...

Without knowing your tools let's screen the problem - the battery is 1500 mAh 
and it can deliver power to the device for hours, say 5 h. This means the 
average current draw during normal operation would be around 300 mA, most of 
which goes to the screen backlight and radios, I guess.

If and when your algorithm can save some power, the difference in current 
would be very small and rapidly changing anyway. To make an exact 
measurement, you would probably need very good measurement equipment and also 
you would want a data logger with reasonably fast A/D converter to see and 
record what really goes on during the execution.

-Teemu

>
> Many thanks,
>
>                Claudio
>
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