RE: Re: {OTish} Power consumption

["Rodney Hall" <rmh@xxxxxxxxxx>]

Yes, I was referring to a (borrowed) Fluke RMS meter! :o)

--
Rodney HALL
Heywood, Lancashire
Suaviter sed fortiter
Agreeably but powerfully

~~~~~~~~~~~~~~
rmh@xxxxxxx
http://rmhh.co.uk/
http://rmhh.org.uk/
~~~~~~~~~~~~~~~~~~~

> -----Original Message-----
> From: David Buckley [mailto:db@xxxxxxx]
> Sent: Wednesday, June 09, 2004 7:11 AM
> To: ukha_d@xxxxxxx
> Subject: [ukha_d] Re: {OTish} Power consumption
>
> --- In ukha_d@xxxxxxx, "Rodney Hall" <rmh@r...> wrote:
>
> > Those figures are calculated by *measuring* the consumption
> > with an ammeter.
>
> Sadly, measuring current to a PC with any old ammeter is a waste of
> time.  Normal ammeters assume that the current waveform is a sine
> wave, measure average current, and display it.
>
> PC and monitor switch mode power supplies do not draw current like a
> sine wave, but more like a spike.  Thus normal average reading
> meters lie.
>
> You need a "true RMS current" ammeter.  These display the
correct
> current irrespective of waveform.  They also cost more than non-true
> RMS reading meters.
>
>
>
>
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