Question about input impedance

Hi everyone,
I was trying to measure a voltage source with 10kohm internal impedance, and I connect the source directly with NI-USB 6009. When the voltage source is 5.043V, the data recorded by labview is around 4.8V. I checked the manual of USB-6009 and found that the input circuit (see the attachment). So I guess when the device was taking data, it was actually taking the data on the crossing node and then converted it back with impedance figures shown in the graph. That's why I got data lower than it should have been.
I was wondering is there any way to deal with it, other than calculating back and converting it with correct impedance?
Regards,
Jude
Solved!
Go to Solution.
Attachments:
屏幕快照 2013-07-18 下午12.19.32.png ‏22 KB

Hi Jude,
you could use an OpAmp to amplify your signal (1:1) an so lower the impedance seen by the USB6009. You could also use some other DAQ hardware with higher input impedance.
In the end the conclusion is: you have to choose your DAQ hardware according to specifications of signal source. You have chosen the wrong hardware...
Best regards,
GerdW
CLAD, using 2009SP1 + LV2011SP1 + LV2014SP1 on WinXP+Win7+cRIO
Kudos are welcome

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