Brandon Peirce wrote:
I'm looking for tips to make that kind of measurement. My first approach
would be
to stick my digital multimeter inline (as ammeter on highest range)
between the
wall socket and the PS and calculate the power consumption as P = 230V * I
where I is the measured current....
Is this a valid approximation? Can I assume that the impedance of the
PS' transformer
is compensated and thus negligable phase shift complications? Or are there
other recognized techniques?
As long as you measure the RMS (Root Mean Square) value for I. (and U;
230V is RMS, the peak voltage would be ~325V)
I_RMS = I_peak / sqrt(2)
http://en.wikipedia.org/wiki/Root_mean_square
http://en.wikipedia.org/wiki/AC_power
can be really brain-twisting, eh?
never mind, as long as you don't have a company with 10,000 computers :)
regards,
philipp
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