Veristand and PXIe 4330

[mvsiva]

Hello everyone,

The following Knowledge Article explains how the sampling rate of the PXIe 4331 is limited in hardware timed single input mode within Veristand: https://knowledge.ni.com/KnowledgeArticleDetails?id=kA00Z000000PA15SAG

However, from the following discussion, it appears that in LabVIEW realtime, higher sampling rate can be used with the PXIe 4330, indicating that perhaps it is not an inherent limitation in the 4330, if there is a way to not use the digital filter: https://forums.ni.com/t5/Multifunction-DAQ/Digital-filtering-in-PXIe-4330-with-hardware-timed-single...

So, I was wondering if there is resolution to the problem within Veristand, may be a custom model for the 4330?

Thank you.

Siva

[JaredT]

Hi mvsiva,

I'm not sure what your application is but you could potentially use the Waveform Processing custom device which uses a different acquisition mode. This would allow you to take averages of your data and display that at a faster rate but you would not have access to the single data points. This is discussed in the Additional Information section of the Knowledge Base article you found.

If that is not a viable option for you, then you would need to either upgrade to the 4331 or you could try writing your own custom device to increase the acquisition rate. 

Building Custom Devices for NI VeriStand

https://www.ni.com/docs/en-US/bundle/veristand/page/custom-device-build.html

Regards,

Jared T.

[mvsiva]

Hi Jared,

Thank you for the reply.

I need to use signals acquired from the 4330 for feedback, so acquisition is waveform mode is not an option.

I may try to build a custom device before considering upgrading to the 4331.

Besides the KnowledgeBase article to cited, are there examples of build custom devices to wrap around hardware (how to interface with the DAQmx drivers etc.)?

Thank you.

Siva

[JaredT · Accepted solution]

Siva,

There is also a developers guide that is very helpful. It talks about incorporating DAQmx functionality so it should get you started.

NI VeriStand Custom Device Developer's Guide

https://niveristand-custom-device-handbook.readthedocs.io/en/latest/

Regards,

Jared T.