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ENOB Testing with QuickDAQ FFT Analysis mode

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ENOB Testing with QuickDAQ FFT Analysis mode


The images below show a user how to configure QuickDAQ v3.7.0.40 (or higher) for calculating and displaying signal statistics, especially ENOB.  Note that you must have the FFT License for QuickDAQ in order to change the MODE (from the top menu) to FFT ANALYZER.

In Image 1, enable an analog input channel via CONFIGURATION – INPUT CHANNEL CONFIGURATION.  Next, on the ACQUISITION CONFIG window, select the RECORDING tab and change the NUMBER OF AVERAGES to be 5.  On the PLOT AND DATA CONFIG window, select your analog input channel and then click on the ADD SINGLE CHANNEL FFT FUNCTION icon beneath it, in order to add the FFT channel to the list.  While still on the PLOT AND DATA CONFIG window, click on the DATA – FUNCTION tabs.  Select AUTO SPECTRUM, NONE, and AMPLITUDE.  Continue with Image 2.

Image 1:



In Image 2, on the ACQUISITION CONFIG window, select the FREQ tab and change the maximum frequency to 250kHz (FFT maximum for a DT9834) and the FFT size to 262144.  Also, set the input channel(s) to be SINGLE ENDED.  On the PLOT AND DATA CONFIG window, click on the DATA – SCALING tabs.  Select ‘dB’, ‘RMS’, and ‘Sensor full scale’.  

Image 2a:


Image 2b:


In Image 3, on the ACQUISITION CONFIG window, select the TRIGGER tab and set the Trigger Source to be ‘Free Run’.  On the PLOT AND DATA CONFIG window, click on the DATA – AVERAGING tabs.  Select ‘Linear’, ‘RMS’, and ‘Enable Averaging’.  

Image 3a:


Image 3b:

In Image 4, on the ACQUISITION CONFIG window, select the WINDOW tab.  Set the Response Window Type to be ‘Blackman Harris’ and the Reference Window Type to be ‘Same as Response’.  On the PLOT AND DATA CONFIG window, click on the STATS tab.  Select the signal statistics as shown in the image

Image 4a:

Image 4b:


Finally, configure a function generator to output a sine wave at 1kHz and approximately +/-7.07 V.  Connect the output signal to the Data Translation module’s specified analog input channel.  Finally, click the RECORD button in QuickDAQ and wait for the acquisition to end.  You should then see the performance stats on your screen.




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Article ID: 50634

Last Modified:3/30/2017 8:15:48 AM

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