TDS3054B FFT Question.

[mpirello]

Hi,

I have a question about using the FFT function on the TDS3054B Digital Phosphor Oscilloscope. When I am using the FFT in Linear mode, it autosets the horizontal scale constantly and makes getting a good reading impossible. Is there a way to disable this feature? I searched high and low through the menus and also in the user guide (which does not even mention the FFT). I really need this to work so that we can move forward with EMI testing. Any help would be greatly appreciated.

Love the scope BTW, everything works great.

Marc Pirello
Lead Electrical Engineer
Mohr & Asscociates
Richland, WA 99336

[notnomis]

Per your conversation with Don...

"Live waveform input was clipping on 10mV/Div scale which causes FFT linear RMS scale to rescale wildly. We discussed the limited dynamic range 42dB to 54dB with a 9-bit A/D."


Tektronix Support Request #87106