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TDS1000/2000-Series Digital Oscilloscope User Manual
H If you do not need to view frequencie s components above 20
MHz, set the Bandwidth Limit option to On.
H Put an external filter on the source signal to bandwidth limit the
source waveform to frequencies below that of the Nyquist
frequency.
H Recognize and ignore the aliased frequencies.
H Use zoom controls and the cursors to magnify and measure the
FFT spectrum
Magnifying and Positioning an FFT Spectrum
You can magnify and use cursors to take measurements on the FFT
spectrum. The oscilloscope includes an FFT Zoom option to magnify
horizontally. To magnify vertically, you can use the vertical controls.
Horizontal Zoom and Position
The FFT Zoom option lets you horizontally magnify the FFT
spectrum without changing the sample rate. Zoom factors are X1
(default), X2, X5, and X10. At zoom factor X1, and with the
waveform centered in the graticule, the left graticule line is at 0 Hz
and the right graticule line is at the Nyquist frequency.