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ENERGY AUDIT - Page 2

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Posted by Ian Stirling on October 19, 2003, 11:41 pm
 

If the same one I have, then it works OK for most loads.
It misreads quite a lot on my PC power supply, reading high by
100%.

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Posted by sam1967@hetnet.nl on October 20, 2003, 7:28 am
 
On Sun, 19 Oct 2003 23:41:53 +0000 (UTC), Ian Stirling


shit. why is that ? and how much does your pc use ?


Posted by modervador on October 20, 2003, 9:15 pm
 
As to why, probably the PC's switching power supply has a very strange
power factor, i.e. the current waveform throws the meter off.

%mod%

Posted by Ian Stirling on October 21, 2003, 2:42 am
 
It's not the power factor.
Power factor is a measure of how much the alternating current and voltage
is in step.

The PSU in question has a power factor of 1.
However, the current is very spiky, not smooth, and the meter can't
keep up with it, and miscalculates the power.
(the PSU was around $0(us) and has now failed. I'm about to open it up
and investigate the circuit.)

--
http://inquisitor.i.am/     |  mailto:inquisitor@i.am |             Ian Stirling.
---------------------------+-------------------------+--------------------------
Windows 2000, software for next millenia.     <latin pun alert>  - Ian Stirling.

Posted by sam1967@hetnet.nl on October 21, 2003, 6:48 am
 On Tue, 21 Oct 2003 02:42:11 +0000 (UTC), Ian Stirling


be careful ! i read those capacitors inside carry quite a charge.


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