Reading Voltage Drops Across Multiple Resistors

HI,
We are creating a PC interfaced IC tester. To do this we need to be able to monitor and record the behavior of the chip in question. The easiest way we have come up with to do this is to place common resistors on the inputs and outputs of these basic devices. By doing this we will be able to read the voltage drop across each resistor, since we know the resistance we can then figure out the current, we measured the voltage and we know all we need to. The problem we are having is reading in multiple channels of data at once. We are using Labview version 7.0 and DAQ PCI-6024E and have our inputs set up in differential mode. We can get one channel to read but when two are connected we have problems with our readings being affected by each other. I have attached the vi file so if anyone can be of any assistance it would be much appreciated. We are beginners here so please be as specific as possible and dumb it down if necessary.
Thanks in advance
Rylon
Attachments:
ICtester.zip ‏214 KB

Hi Rylon-
It sounds like you are seeing ghosting of signals between your channels. KnowledgeBase "How Do I Eliminate Ghosting From My Measurements?" should be helpful in reducing this effect.
KnowledgeBase "Seeing the Same Signal on Several Scanned Channels, Especially when No Signal Is Conn... may also be pertinent if you are leaving the channels you're not testing without connections between testing channels.
Thanks-
Tom W
National Instruments

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