Cirrus Logic CapturePlus II - Manual (Page 35)

CapturePlus II
DS789UM2 35
Click on the Acquire button. Within the Acquire sub-panel, set Select Number of Samples to Capture to
524288. Click on Enable Averaged FFT. In this example, Averages have been set to 4.
Start the test run by clicking OK. Run time for this test is approximately 1 minute for a 100 kSps ADC.
A typical FFT plot resulting from running a full-scale input test is shown below. Key information calculated
from the captured data and displayed is the SFDR, SINAD, S/D, and SNR.
Notice that when running an averaged multiple FFT test, the user is not required to activate the Analyze
FFT button to display the FFT graph. Only when capturing single data sets is the user required to activate
the Analyze FFT button to display the FFT graph.