All AI channels have the same value

I use the example aiex2.cpp for a multichannel AI read with the mseries devices NI6280.
This example works for one channel, but the other channels have the same value
For example: I set 5Volt on the first channel and then the other channel have 5Volt too.
What should I consider in the configuration?
beilei
Solved!
Go to Solution.

Hello Beilei,
I think that you are running into the AI ghosting issue. Are the other channels you are using connected to ground when you connect the first channel to 5V? If the other channels are floating, they will read the same value as the first channel...5V.
Steven T.

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All AI channels have the same value - NI PCI-6221 and NI PCI-6229

Hello,
I use the example aiex1.cpp for a multichannel AI read with the mseries devices 6221 and 6229.
This example works for one channel, but the other channels have the same value (+- 0.001 Volt difference).
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Heiko
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Go to Solution.

Hi Heiko,
Like Moritz, I'm curious what signals you have connected to your AI channels. What voltage do you expect to read on each channel?
Tom gave me your initialization code and it looks like you've modified aiex1.cpp. Does the example work without any changes?
I have some more questions that will help me determine where the problem could be coming from, but these two are the easiest. We'll keep getting more and more specific as we remove possible causes.
Joe Friedchicken
NI VirtualBench Application Software
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Senior Software Engineer :: Multifunction Instruments Applications Group
Software Engineer :: Measurements RLP Group (until Mar 2014)
Applications Engineer :: High Speed Product Group (until Sep 2008)

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