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Old 30-03-2007, 12:15 PM   #1
hugofirst
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Quick question about measuring resistance (ohms)

Hi,

Im about to do a pencil mod (vdroop) to my Commando Motherboard and all the guides i've seen have just said to measure the resistance etc...

So, Below is a picture of a DMM I found lying around and am a bit unsure which setting to have on.

Im guessing its 200Ohms (5 clicks right of whats shown in the pic) but would rather check first..

My options are: (and lets just say that the & is the OHMS symbol)

2000M&
20M&
20k&
200&
DCV 1000V
ACV 750V
200A
1000A

Which to use?? And im guessing I want to get as close to 0 as possible...

Actually - While im at it - Does anyone know where the points are on the Commando I can measure the voltage of the Vcore & Vdimm? (Screen shots would be GREAT!)

Thanks!

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Old 30-03-2007, 02:10 PM   #2
T_M
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Re: Quick question about measuring resistance (ohms)

The difference between the different settings is really just a choice of resolution. If you are trying to read resistances that are for example 100 Ohms, then setting your DMM to 20k will mean you just cant see any measurement, because its too fine/small on the scale of 0-20,000. Whereas if you set it to 200 Ohms, youll be able to read it no problem
You wont damage anything at all by having it on the wrong resistance setting, just might wonder why you read NIL or 0 or have a blank screen

Just remember that you put one lead onto each end of the thing you are trying to measure the resistance of, or if you want to check if something is grounded them measure between it and a known ground.

For doing work on your PC like volt mods, i'd really recommend a DMM with more settings available (that one has only two - 200 and 20k).
You will probably want one that has 2k also.

Suggest this thread gets moved to a general area.

Last edited by T_M; 30-03-2007 at 03:06 PM.
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Old 30-03-2007, 02:54 PM   #3
hugofirst
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Re: Quick question about measuring resistance (ohms)

Thanks for that!

Last question:

Say I have it set on 20K. and the resistance is actually 80K ohm.. will 80.00 be displayed?? or will it be 04.00 as in: 80k / 20k = 04.00

Again, If I have it set on 20K and the resistance is actually 10K ohm.. will 10.00 be displayed?? or will it be 00.50 as in 10k / 20k = 0.50

?????????????


Thanks again!

Last edited by hugofirst; 30-03-2007 at 03:06 PM.
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Old 30-03-2007, 03:02 PM   #4
T_M
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Re: Quick question about measuring resistance (ohms)

It'll display the real reading, not a fraction of the setting value
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Old 30-03-2007, 03:07 PM   #5
hugofirst
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Re: Quick question about measuring resistance (ohms)

Thanks! See how I go!
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