How to perform order analysis using 9229 as vibration input and 9401 as digital tacho input

[visuman]

Hi

     I have a 9074 compact RIO chassis, on which 9229 and 9401 modules are mounted. Iam trying to perform order analysis of a vibration signal using this two modules, the vibration input is given to NI 9229 module and the digital tacho input is given to NI 9401 module. Iam acquring this two data and trying to use order tracking express VI to track the the respective magnitude and phase value of orders 1,2 and 3 at the host. But iam getting the results as Magnitude = 0 and Phase = infinity. Do anybody have worked on this kind of analysis, if so kindly let me know what and all the things i have to take care to perform this analysis, or is there any example vi related to this.

Iam sampling at the rate of 5 KHz.

[preston_johnson]

Thank you for the post.  You have a nice system.  Can you tell us what the unit under test is?

How is the data getting from the FPGA to the RT Host?  Can you provide a snapshot of the waveforms, say a graph of the analog 9229 data and the digital 9401 data?

The first step we need to insure is that we are getting good data capture. 

[visuman]

Thank you for the reply preston

- The unit under test is rotating shaft machine, on which non-contact probe sensor is mounted to provide analog data for 9229 module and a proximity sensor is mounted to acquire digital data for 9401.

- A snapshot labeled FPGA code is attached to show how the data is getting from the FPGA to the Host.

- A Snap shot of 9229 and 9401 waveforms is also provided.

- And also iam attaching the code code consisting of the data which i have collected from FPGA.

Regards

Bharath 

[preston_johnson]

Thanks for the post,

Your configuration - 9233/9234 for accelerometer, 9229 for Prox Probe, and Digital input (or other lower cost analog) for tachometer is very common for rotating machinery applications. 

In your project, are you sharing the clock from the 9233 with the 9229 so that they are in sync?  You will want them to be in sync and want them running at the same sample rate. 

The graphis look good.  Can you share a snapshot of the order analysis code you are trying to get going?

Thanks in advance

[Jack_A.]

I'm attaching some code which will hopefully help out on the RT side of things.  I'm not sure how far you are along those lines, but what I would recommend is to actually treat the digital tach as an analog signal as far as the software processing goes.  You can set the threshold level of Analog Tacho Process VI to 0.5 V.  Let me know how this works for you.

-Jack