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How to set voltage compensation in MBM5

post #1 of 8
Thread Starter 
I just picked up a digital multimeter from Home Depot, a Commercial Electric Digital Multimeter, model # HDM350, for 20 bucks. Does all the line measurements and more. I'm measuring my voltages on my OCZ Powerstream. I noticed that the voltage measurements are way off in MBM5, and I need to compensate for this. Does anyone know how to?
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post #2 of 8
just a warning, I've found that cheap multimeters are usually inaccurate--- I had a 20 dollar one from harbor frieght forget the brand and it was offanywhere from 5-10% @12vac and 3-6%vdc, retested with my uei and ampprobe insturments and found my other two were in dead agreement with each other (this was testing a touchplate lighting control system, not a computer btw)
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post #3 of 8
Thread Starter 
Meh... I already bought it, and I'm going to go by what this says. Besides, I'm pretty confident it its quality. Do you know how to set compensation at all?
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post #4 of 8
So you need to measure the rails - +12v, +5V, 3.3v when the system is posting, at Idle and under load.

12V rail can be measure from yellow wire on MB main power connector.
3.3V is orange wire
5.0V is red wire

From there you willl get the value you wish to display in MBM5.

Check what mem5 displays at Idle / Load.

As to changing compensation settings for MBM it's fairly straightforward.
enter mbm data subdirectory and alter Voltage custom.ini

here is and example of mine.

[Custom]

V1=$20*0.01664 //V CPU
V2=$21*0.016 //V LDT
V3=$22*0.01648 //V +3.3
V4=$23*0.02775 //V +5.00
V5=$24*0.06575 //V +12.00
V6=$25*0.0163 //V NB
V7=$26*0.0164 //V DDR
V8=$27*0.02705 //V +5VSB
V9=$28*0.016 //V Battery


The details are explained in voltage.ini but basically you need to alter the compensation factor (V1=$20*0.01664 shown in red) by the appropriate amount.

ex.
1. take current mbm reading for sensor. say 5.0V
2. take DMM measured reading for sensor. say 5.1V
3. take current compensation factor for sensor. say 0.016

Edit: for clarity

some simple algebra:
dmm measurement / current mbm reading) * current compensation factor = New compensation factor

(5.1V / 5.0V) * 0.016 = 0.01632

If you find that the Custom option does not work then edit the main .ini file directly in the same manner.
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post #5 of 8
Thread Starter 
Excellent. I'll be giving that a shot for the 3 rails, and then I'll move on to Vcore and other such things. Ncsa, do you know of the voltage measuring points on the Ultra-D by any chance?
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post #6 of 8
Thread Starter 
Okay, I got all my voltage compensations set with my OCZ Powerstream and Ultra-D. Found this link that showed me all the voltage measuring points for the board:
http://xtremesystems.org/forums/show...1&postcount=10
The nice thing about MBM5 is that it's able to use long digit compensation factors; I'll post my configuration file in a sec. When you set voltage configurations, you must remember that it's a .ini file, and the MBM core app reads it when it starts up, and never again until teh next startup. So, when setting compensation, restart MBM5 each time you save so you see what you set.
Here we are:

Quote:
Originally Posted by Voltage.ini
V3=ITE8712F Standard 4
V3V1=$20*0.016588235294117647058823529411765 //V P4
V3V2=$21*0.016 //V AGP
V3V3=$22*0.016603773584905660377358490566038 //V +3.3
V3V4=$23*0.0277 //V +5.00
V3V5=$24*0.06520 //V +12.00
V3V6=$25*0.016322147651006711409395973154362 // V_NB
V3V7=$26*0.016355555555555555555555555555556 // V_DDR
V3V8=$27*0.016 // UnKnown?
V3V9=$28*0.016 // Battery
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post #7 of 8
Quote:
Originally Posted by Burn
Excellent. I'll be giving that a shot for the 3 rails, and then I'll move on to Vcore and other such things. Ncsa, do you know of the voltage measuring points on the Ultra-D by any chance?
I believe they are the same as the DR model .. here

http://www.overclock.net/faqs/38268-...roduction.html

Will update this to include the other measurement points as well.

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post #8 of 8
Thread Starter 
Xtremesystems had what I wanted.
http://xtremesystems.org/forums/show...1&postcount=10

All measuring points. All compatible with all DFI Nforce4 939 boards. Thanks for the FAQ, I'll be taking a peek at that when I start to seriously overclock this setup.

I got all my calibrations set last night, works great now.
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