Need NI 9205 module to read pressure transducer

[e=mc2]

Hello,

I have a NI 9205 I am using to read the data from a 3 wire pressure transducer. However I am not sure how to connect it properly. I have a the + signal wire going into the NI 9205 AI0 port. The transducer needs an excitation voltage from of 15V-30V which I am providing a from a DC output. I am connecting the positive terminal to the + excitation wire, and the negative terminal to the - excitation wire, so that power is being supplied. The - excitation also acts as the COM.

When I run with this set up I am not getting good data. The voltage being read jumps everywhere. 

I have tried running the NI 9205 in DIFF, NRSE, and RSE mode, but nothing seems to be working. So I know I am not connecting the pressure transducer up properly. 

Any information to that will point me in the right direction is appreciated.

Thank you!

[moderator1983]

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@e=mc2 wrote:

However I am not sure how to connect it properly. I have a the + signal wire going into the NI 9205 AI0 port. The transducer needs an excitation voltage from of 15V-30V which I am providing a from a DC output. I am connecting the positive terminal to the + excitation wire, and the negative terminal to the - excitation wire, so that power is being supplied. The - excitation also acts as the COM.

When I run with this set up I am not getting good data. The voltage being read jumps everywhere. 

I have tried running the NI 9205 in DIFF, NRSE, and RSE mode, but nothing seems to be working. So I know I am not connecting the pressure transducer up properly.

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Make sure, which wire is positive excitation (supply to transducer) and which one is poisitive signal (output of transducer). Now the connection should be:

In Diff mode:

Signal Out (+) = terminal 1 (AI0)

Commin = terminal 19 (AI8)

In RSE mode:

Signal Out (+) = terminal 1 (AI0)

Commin = terminal 17 (COM)

In NRSE mode:

Signal Out (+) = terminal 1 (AI0)

Commin = terminal 35 (AI SENSE)