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sound pressure reporting

Hi,

 

We are new (actually, still evaluating) LabView customers.  I know nothing about Labview, and less about the technical intracacies of the project that I have to complete.  Basically, what I need to do is acquire and capture up to three streams of sound pressure data using B&K 4944-A sound pressure mics attached to an NI 9233.  I think we can do this with SignalExpress and the S&V Assistant.  In essence we are replacing three B&K 2209 sound meters with B&K 4136 pressure mics capturing one or more precussive sound events.  The new hardware is already purchased.  We are trying to get the capture and reporting going.

 

My need is:

 

1.  Capture a continuous stream of log data beginning with starting to record and ending with stopping the recording.  We need to trigger the start of the actual logging based on a rising slope over 110 dB, and capture data for .25 seconds after the trigger is met (I have been unable to capture any data yet - probably has to do with I don't know where the values to set in the trigger).  We need the trigger to be activated continuously until the recording is stopped.

 

2.  Reporting.  For each triggered log event above, need to extract and report the peak sound pressure level (dB) for the three data sources logged.  Tabled data is OK; graphs and charts are not necessary.

 

3.  Would like to (automatically, if possible) store the results from #2 above in a database to evalute potential product changes.  For now we can use Visual Pen and Paper.

 

Can anyone help with a starting point?

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Hello,

 

Triggering based on the level of the signal itself is known as an analog start trigger. Since the NI 9233 does not have analog or digital triggering, we could use another module (like a NI 9205) to start the task that the NI 9233 is in.

 

How Can I Trigger a NI 9233 or 9234?

http://digital.ni.com/public.nsf/allkb/4859504F14AF68DB8625721100640F26

 

If you do not want to buy another module, you could try post-processing the data to ignore any data that comes in before this level.

 

I hope this helps.

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