Order FFT vs Time FFT Waterfall Plots
Hello!
I recently recorded some data using the Order Tracking Math module within DEWESoft. The data collected was plotted on an Order FFT Waterfall plot and a Time FFT Waterfall plot, as shown below.
As shown above, the amplitude of the accelerometer do not match between the two waterfall plots. The screen below shows the OT setup.
After going through the Pro Training Order Tracking Course, I see in the example provided the amplitude matches between the two waterfall plots. Is there an error in my setup/settings that would cause the mismatch in my data above?
Thanks in advance,
Kierstein
NVH Application Engineer
Dear @Kierstein Casto,
Would it be possible to send us your datafile where you see those differencies? I tried to see the same phenomena on my computer with datafiles, but the values are matching.
Best regards,
Hello!
I tried attaching the data file but the file exceeds the max allowable attachment size (zipped data file is 13.05 MB). Is there another way I could send it?
Thanks,
Kierstein
Technical support
Dear Kierstein,
attached you will find the instruction on how to upload big files.
Regards
Attached files:
Thank you so much! I have attached the data file through the private forum.
Kierstein
Hello!
Just following up - were you able to receive the setup file via the private forum?
Thanks,
Kierstein
Technical support
Dear Kiersten,
the difference that exist in your datafiles between values on the FFT waterfall and Order waterfall is a normal behaviour. The input into these two visual controls is not the same signal.
In Order waterfall, the FFT is calculated from resampled order domain data
If FFT waterfall, the FFT is calculated from time domain data of the direct input data.
Therefore, the difference in the amplitudes exists
Best regards,