Urs, Sorry I forgot you used 3v lab power supply. So I revised my diagram as following:
> > > +-----------------------------+-----------------------------------+-------------------+ > | > | | | > mote resistor (1 or 10 Ohm) 3v Power > Oscilloscope or multimeter > | > | | | > > +-----------------------------+-----------------------------------+-------------------+ > > > > > > David > > > > On Wed, May 13, 2009 at 11:50 PM, Urs Hunkeler <[email protected]> wrote: > >> Hi David, >> >> I use a high-precision 1 Ohm or 10 Ohm resistor connected in series >> between the mote and a laboratory power supply set to 3V. I then measure the >> voltage over the resistor with a digital oscilloscope. This allows me to >> sample the power consumption at a high frequency and thus distinguish >> between different phases of operation (radio turning on vs. listening vs. >> actually sending data). >> >> Cheers, >> Urs >> >> >> >> David Li wrote: >> >>> Hi, >>> >>> This is probably an age old question that was asked many times. I did >>> search >>> the archive but didn't find exactly what I was looking for. I am using >>> TinyOS 2.1 on Ubuntu 9.10 on Iris motes. >>> >>> What's kind of instruments do people normally use to measure current and >>> power consumptions? What's the standard practice to use these on motes >>> running TinyOS2.1? >>> >>> I have heard about NI and Agilent. But I am hoping someone can point me >>> to >>> some detailed example or documentation. >>> >>> Thanks. >>> >>> David >>> >> >
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