I need to calculate Total Harmonic Distortion

[DieselPower]

Are there any packages in Measurement Studio to calculate total harmonic distortion?

What is the best way to read a signal at 2 kHz while reading several others at 1 Hz?

Thank you.

[Sergei]

Hi, You could use NationalInstruments.Analysis.SpectralMeasurements.Measurements (NI Measurement Studio .NET Class Library)

[DieselPower]

I figured that much out, but I can't find any example code.  All I could find was the function call and the parameters.  Do I have to figure out how to do it based off of that?  I'd also like to know the best way to set up a task to do it.  ie read over a certain period like 500 ms and then process it so I can get 1 second updates...

[JonathanN]

Hi SCXI,

It sounds like you need to be using the Spectral Measurements methods (NationalInstruments.Analysis.SpectralMeasurements.Measurmenst) with the HarmonicAnalyzer method. Locate information about this method by opening the Measurement Studio help, switch to index tab, and type harmonicanalyzer. There is an Power Spectrum example that uses this method located at C:\Program Files\National Instruments\MeasurementStudioVS2003\VCNET\Examples\Math\Power Spectrum.

Hope this helps!

Best Regards,