I have been using a digital oscilloscope to measure a fast transient signal and have then processed the data in MATLAB. Performing an FFT on the data I consistently see a significantly large low frequency component which I believe is not part of the actual signal but rather to do with how the oscilloscope is measuring the signal. I have a few questions and would be very grateful to anyone that can help:
- How can I prove the low frequency component isn't actually part of the signal (assuming this is true)?
- What techniques can I use to remove this low frequency component from the data?
On question 2, I have tried using a high pass filter in MATLAB however when I then perform and IFFT the time domain signal looks significantly different to what I would expect.
Thanks in advance for any help.