power consumption

[Steven Hunt]

If the current is fluctuating rapidly you start to run into problems
like, "is my multimeter measuring the average current or the RMS
current?", which give you different answers for the power used.

On Thu, May 21, 2009 at 5:01 PM, hong zhang <henryzhang62 at yahoo.com> wrote:
>
> If current drian is up down not stable, I need to measure average value in a period of time.
> Do you think multimeter can do that?
>
> --- On Thu, 5/21/09, Greg KH <greg at kroah.com> wrote:
>
> > From: Greg KH <greg at kroah.com>
> > Subject: Re: power consumption
> > To: "hong zhang" <henryzhang62 at yahoo.com>
> > Cc: devel at linuxdriverproject.org
> > Date: Thursday, May 21, 2009, 6:52 PM
> > On Thu, May 21, 2009 at 01:25:52PM
> > -0700, hong zhang wrote:
> > >
> > > List,
> > >
> > > I want to measure power consumption for my wifi card.
> > acpi has 10%
> > > error range. Do we have better tool to measure power
> > consumption in
> > > Linux?
> >
> > A multimeter on a tracepoint on the motherboard is the best
> > thing for
> > that.  Or a meter on the power cord with the battery
> > unplugged is also a
> > good guess.
> >
> > Good luck,
> >
> > greg k-h
> >
>
>
>
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