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Written by Kyla Gregoire   
Monday, 14 September 2009

Hello-

I'm working on an MFC that will require me to take voltage readings every 20 minutes for roughly 2 weeks.  I have been looking into multimeters & data acquisition cards to log the data directly in my PC.  I was recently advised that the internal impedance of the multimeter/data acquisition system must be at least 10X higher that the impedence (internal resistance) of the MFC.  This would mean that the low-cost data acquisition systems are not viable and would record erroneous data for any voltage > 100 mV.  I am curious if others have come across this problem, and how it was resolved.  Are the high-tech multimeters (e.g. Fluke or Keithley) the only way to accurately record voltage from the MFCs?  Does anyone have reviews of the multimeters or data acquisitons cards they have used?  Thanks very much.
 Kyla Gregoire
University of Maryland

» 1 Comment
1"Multimeter impedance"
at Friday, 18 December 2009 10:47by glepa
Hello!  
I personally use an Agilent 34970A as data aquisition system wich I do not consider as a top-of-the-range system. Even a classical portable multimeter device is accurate enough for that kind of measurement. Even if your MFC internal resistance is about 5Kohm (which is quite high!) you need a 50 Kohm impedance for measurement... That's quite common! ;)
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