Why "Acq&Graph Voltage-Int Clk.vi" does not get constant voltage for constant voltage input?

Dear All
Labview 7.1/XP/NI6221
I try to use NI 6221 to read analog input by using "Acq&Graph Voltage-Int Clk.vi".
The reading voltage does not constant and not correct value, when I put constant voltage.
How should I solve this problem? Thank you.
When I use "DAQ Assistant" to read analog input it work well.
Thongchai

Thongchai,
As I recall from an earlier discussion exchange with you, you are performing Reference Single Ended (RSE) measurements on channels 0-3, is that correct? In the example, there is no selection for the input terminal configuration on the DAQmx Create Task -- for M-Series boards on channels 0-8 the default configuration is differential. If you right click on this input and select "Create Constant", you can choose RSE and it should measure the correct values. Let me know how that works for you.
Erik F
Applications Engineer
National Instruments

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I had this Acq&Graph Voltage-Int Clk.vi running excellently since 4yrs. Only yesterday I see this error poping when I run this program.
The pop up says : Error-2147220712 occured at DAQmx Create channel (AI-Voltage-Basic).vi
I tried to run the example Acq&Graph Voltage-Int Clk.vi and I get the same error.
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Why "Acq&Graph Voltage-Int Clk.vi" does not get constant voltage for constant voltage input?

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