Reading with high impedance output (Keithley 2440)

Hi all,
I am using Keithley 2440 and I am going to charge a capacitor and then measure the voltage of that capacitor to see how fast it discharges BY ITSELF. So I need to set the output to High Impedance and measure the voltage.
But my problem is how I can measure while I set the output to High Impedance. I made a vi to do that. But during discharging, Keithley voltage remains the same as charging. So, obviously I am not using High Impedance correctly.
Is there any tutorial for measuring voltage and/or current at High Impedance output setting?
Thanks

Hi,
Yes. I looked at the examples that come from Keithley 24XX deriver (vi attached). I suppose that impedance of voltage measurement is high enough so that it does not affect the capacitor that I am going to do measurement on. So I can use Keithley to just measure the voltage.
But, the problem with all "measurement" examples that I've seen is that you need to set an output level to be able to measure it! Why should I need to set output if I want to measure it?
Thanks!
Attachments:
Keithley 24XX Read Single.vi ‏41 KB

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I'm using keithley 2440 sourcemeter to measure the resistance value with 4 wire. I downloaded LabView driver, tested an example program , and
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Attachments:
Keithley 24XX Read Single.vi ‏46 KB

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