DC Offset using the PCI-MIO-16E-1

[stupid]

Hello, I have a question concerning sampling an analog signal using the
PCI-MIO-16E-1. There appears to be a dc offset present when I sample an
analog signal. My input signal does not have a dc offset, so I believe that
the PCI-MIO-16E-1 card must insert some dc offset.

For example if I insert a sine wave with zero dc offset with a peak to peak
voltage of 4 volts, the labview display will show the sine wave from 0
volts to 4 volts, but my oscilloscope show -2 volts to +2 volts. Can anyone
tell me why this happens.

thanks,
joe

[Alberto]

First of all check that your analog inputs are configured as Referenced Single Ended and not as Differential. (Use the Measurement and Automation explorer and check Analog inputs settings.)

[stupid]

No need to respond to my post, I solved the problem. You need to program the
board for non-reference input.

Joe wrote in message <9e2914$ijs$1@delphi.ridgenet.net>...
>Hello, I have a question concerning sampling an analog signal using the
>PCI-MIO-16E-1. There appears to be a dc offset present when I sample an
>analog signal. My input signal does not have a dc offset, so I believe that
>the PCI-MIO-16E-1 card must insert some dc offset.
>
>For example if I insert a sine wave with zero dc offset with a peak to peak
>voltage of 4 volts, the labview display will show the sine wave from 0
>volts to 4 volts, but my oscilloscope show -2 volts to +2 volts. Can anyone
>tell me why this happens.
>
>thanks,
>joe
>
>