Multifunction DAQ

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Open channel error

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I have my AT-MIO-16D-9L board configured in RSE mode and am reading the output
from three channels in my acquisition program. When I have a source (such
as battery) connected to two of the channels, those two channels give an
accurate reading. The third "open" channel does not read exactly 10 V (internal
reference) though. Can anyone propose a solution (or even possible cause)
to this? The problem seems to get worse when the sampling time is increased.
Thanks in advance.
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