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Wrong AO output

Hi, The analog output of my USB-6211 stays at 3.2V whatever value I specify that is smaller than 3.2V( for example, 0V, -3V etc.) , either in Labview programs or in MAX. The output is correct if a value larger than 4 V is spedified. Could anyone give any suggestion to solve this problem? Thanks a lot.
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Any circuit you have connected in between?  How is the ground connected?

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Kudos and Accepted as Solution are welcome!
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