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PCI-6229 AI accuracy when using AI0 and AI8 at the same time

When I use AI0 or AI8 singly to measure a voltage, they are both OK. But when I use them simultaneously, the accuracy is bad. I wonder if only me that experience this. 

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Hi GrayJoker,

 

Did you accidentally set terminal configuration to "differential"? Because AI0/AI8 is positive/negative input pair for differential measurement, same goes for AI1/AI9, AI2/AI10 and so on.

 

You could use other AI inputs for measurement or change the configuration accordingly.

 

Regards

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