Electronics > Beginners

How to setup equip to measure FFT

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rhb:
I have a Rigol DS1102E.  The FFT is completely useless.  I bought an Instek because it will do a 1 Mpt FFT.  It's still a crappy FFT, but at least usable.  There is a spectrum analyzer app for the MDO line, but the license has been hacked and it will run on any of the GDS-2000E variants.  One minor problem though,  The FFT was not coded correctly.  So if you sweep a crystal you get two positive peaks instead of a positive parallel resonance peak and a negative series resonance peak.  I suspect the programmer took the modulus by squaring the FFT and then taking a square root.

With the Rigol you're better off transferring data to a PC and using Octave or MATLAB.

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