Measure sound power and sound intensity with NI USB-9233

Dear,
I'm new to Labview and I have a question. A few weeks ago, we have bought a CompactDAQ system with among other things a USB-9233 card.
Now I have found out it's also possible to do sound measurements with this card.
I would like to do sound intensity measurements and sound power calculations. Is it possible?
I have LV 7.0 and the Sound and Vibration Toolset for LV. Do I need additional hardware and/or software?
We currently have B&K microphones and a B&K sound intensity probe. Can I use them with the 9233 card?
Or do we need to buy new equipment?
Thanks in advance,
Ronny C

The USB-9233 only works with pre-polarized microphones.   This means that the ICP (IEPE or Deltatron as B&K calls it) is always enabled.   IThe sound intensity probe you have probably requires a 200V power supply.   We have a new module coming out soon (January 2008) called the NI 9234 that offers options to enable/disable the ICP as well as AC/DC coupling and 51.2 kS/s sampling rate.
With this you could use your sound intensity probe with this module if you had a precision power supply.   It will also work with our other dynamic signal acquisition producuts like the NI 446X, NI 4472, and NI 449X that allow you to turn-off ICP.   You can use the 9233 with a GRAS sound intensity probe that has ICP type microphones.
In addition, one of the GRAS designers gave a presentation at NI Week on making Sound Intensity measurements with LabVIEW that I can send to you.   They are going to offer the code to interested users and we will post it on our web site.    In addition they plan to implement a multi channel version for vector intensity with our higher channel count products.
You would need to have the Sound and Vibration toolkit or Measurement Suite with LabVIEW 8.X for optimal results.   The latest version of the Sound and Vibration toolkit just released in December with additional features including the Sound and Vibration Assistant, human vibration filters, and more Express VIs.
Kurt Veggeberg
Business Development Manager, Sound and Vibration
[email protected]

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