Configuration mode of NI 9234 in LabVIEW FPGA applications

[S3Lab]

Hi everybody,

I'm using LabVIEW to build an application able to record voltage signal through a NI 9234 module. I'm currently developing a LabVIEW FPGA application running on a cRIO-9054 chassis.

The LabVIEW version is the 2024 Q1 (64-bit) and the application is supposed to generate a sinusoidal voltage signal through te NI 9263 and acquire three signal through the NI 9234 module (a accelerometer, a voltage signal coming from an external console through a BNC cable and a voltage signal coming from a voltage divider). The voltage divider is used to retrive the resistance value of a specimen.

I have the feeling that there's something wrong with the configuration mode because whenever I run the application without connecting the clips that allows to the measurement of the voltage drop(on the voltage divider) the acquired signals from the other two channels works fine. As soon as i connect the clips, all the three signals records make no sense. I tried to supply the voltage source both with the NI 9263 and with an external voltage supplier, but nothing changed.

I wonder if there is a block to set the configuration mode as when I develop applications in the DAQmx or if you think that the reason of this must be found in other causes.

Thank you very much to anyone who wants to help me solve this problem!

[ZYOng]

It does sound like a wiring and input configuration issue. Make sure you refer to Table 1 in Field Wiring and Noise Considerations for Analog Signals

You can set the cRIO-9054 to DAQmx Mode and use Test Panel in NI MAX to figure out the correct configuration and wiring. Once you decide which input configuration to use, you can configure it by right-clicking on your NI-9234 in the LabVIEW project explorer and selecting Properties.