Multifunction DAQ

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AI acquisition problem

I have written a C code in Visual C++ using NI-DAQ functions in order to
put a digital step at the input of a first-order high pass filter and immediately
measure the output.
The problem is that the acquired data gives continously two values: one
higher than the real one and another lower. Both values are near the real
value and the problem is not due to noise because with the configuration
utility of LabVIEW I obtain the correct value.
Have anyone ever had this problem?
Thank you
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