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 Post subject: Testing PC CPUs
PostPosted: Mon Jul 23, 2012 5:06 pm 
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Joined: Mon Jul 23, 2012 4:47 pm
Posts: 2
Did my 2377 many moons ago but never actually used it. Now it seems I'm going to be doing a bit of PAT testing (I've been 'volunteered'). So, a quick question about testing PC CPUs: What's the accepted method for making sure the CPU is 'on' while testing? I was thinking just to use the handle of an insulated screwdriver to keep the power button pressed throughout the test. Is that about right or is there a better workaround?


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 Post subject: Re: Testing PC CPUs
PostPosted: Mon Jul 23, 2012 7:36 pm 
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Joined: Sat Nov 20, 2010 10:08 pm
Posts: 38
I wouldn't make sure the PC was 'turned on' at all if I were testing!

All the PC should need is earth continuity (soft test @ 20mA - 200mA, depending on what your tester can do), and then an IR test (500V is fine for modern IT equipment, but if you are wary then go with a 250V (if you tester is able to)).
If there is a 'hard' mains switch on the PSU, usually next to the IEC inlet (some have, some haven't), do make sure this in the 'on' position.
I wouldn't perform any test that would power up the PC to 230V mains, and certainly wouldn't make the PC begin to boot, as it will loose power after about 5 s (when the test ends), and crash out of the boot sequence. Not good, in general.

_________________
C&G 2377-01 & -02


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 Post subject: Re: Testing PC CPUs
PostPosted: Mon Jul 23, 2012 9:56 pm 
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Joined: Mon Jul 23, 2012 4:47 pm
Posts: 2
Cheers for that, Grizzly. I mistakenly thought I was obliged to do a touch current test on PCs but a quick read through the Code Of Practice confirms exactly what you're saying. And no problem with the soft test options, the machine I'll be using is a Megger PAT4 DV3.

Thanks again,
Tom.


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