Distortion Measurement for C

[Hansen150]

Hi,

I am using a DAQ 6009 and I have two 3-axis accelerometers hooked up to ports ai0-ai5 in RSE mode. The acclerometers are ADXL335's and I made custom scales for their voltages to convert the voltages into accleration measurements (g). I am using Signal Express to analyze the signals, while building on the VC_TDMS_Cont_IntClk example C code in Visual C++. I can export the data points fine to an excel TDMS file. However, in Signal Express there is the Distortion option which gives you the Fundamental Frequency and the Power Spectrum. I wish to get this data through my C code. Is this possible? I do not see any API functions provided in the sample code that support this. Thank you in advance.

Best Regards,

Scott

[Danceman]

Hello,
    So there is an example file that we have for distortion measurements.  If you go to CVI » Example Finder » Browse tab » Analyzing and Processing Signals » thd.cws  
    Also there should be plenty of C code that you can search for on the internet.

http://zone.ni.com/reference/en-XX/help/370051P-01/cvi/libref/cviharmonicanalyzer/

Daniel
Applications Engineering