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Why there are self-excited oscillation on Voltage input on PCI-6229 Card?

hello,

I am using PCI-6229 card to aquisite voltage from a photo diode.

I use differential mode to connect plus node on ai21 and nagetive on ai29 of PCI-6229. 

this corresponding with terminal 60 & 26 on SCB-68 connector.

But after several seconds the voltage will climb on to the maximum 10V even I leave the terminal of ai21 & ai29 open.

Is it normal of PCI-6229 ?

How to solve this problem?

Thanks a lot!

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