How do I analyze data from cDAQ and Signal Express, especially post-analysis?

[ronni]

In the first test run of my instrument, it took longer than expected for the run.  Thus, the data was logged over 6 days.  The file is too large just to export to Excel.  In beginning the project, I was also unaware that I could go ahead and add analysis and scaling steps.  By scaling, I am referring to switching my data from current to dew points or whatever it is that I'm recording.

How do I scale the data to read the output data as intended 4mA = -20C dewpoint or 0 psi?  Can I pre- program this to be recognized for every test?

For the actual analysis that I am trying to do - I would first like to analyze the data that I have recorded and choose various points to send to Excel to graph and analyze.  Is this possible?

Second, I would like to learn how to scale and analyze my data all in the project without having to do this post-analysis in the future?

I have a cDAQ 9172 with LabVIEW signal Express 3.0 that utilizes four modules - 2 9211 thermocouple modules, 1-9201 +/-10V module and 1-9203 4-20 mA module.

Thank you for any assistance.

[Jason_D]

Hi ronni,

You can scale your data in Signal Express by adding a step Processing»Analog Input»Scaling and Conversion.  You will have to figure out how your scale is applied and I would need more info to help you figure this out.  I am not sure what you mean by pre-program this?  If you add this step it will be executed.

As far as user selecting individual samples and exporting them to excel I don't think this is possible in SE, but you can do this in LabVIEW.  The scaling I mentioned above will "convert" your data and prevent you from having to scale it each time you run that project.  

[ronni]

Thank you Jason.  This will work for the project in the future to keep from having to do this everytime.  I tried to do it on the log file of the previously analyzed data though and keep getting a missing signals error.  That's why I was wondering how to analyze the signals acquired last week since I did not scale beforehand.  Is it obvious I've never worked with this?

Thanks again,

Ronni

[Jason_D · Accepted solution]

Hi ronni,

You can do this by adding a step Load/Save Signals»Analog Signals»<your signal type>.  I hope this helps!