Tektronix TDS1000- Manual do Utilizador descarregar pdf (Página 142)

Math FFT

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TDS1000/2000-Series Digital Oscilloscope User Manual

H If you do not ne ed to view frequencies 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 a nd 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 let s you horizontally magnify the FFT

spectrum without changi ng the sample rate. Zoom factors are X1

(default), X2, X5, a nd X10. At zoom factor X1, and with the

waveform centered in the graticule, the left graticule line is at 0 Hz

and the right gra ticule line is at the Nyquist frequency.

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Tektronix TDS1000- Manual do Utilizador Página 142