SIGLENT SDS1000D Manual de usuario descargar pdf (Pagina 41)

need to use.

Table 2-10 FFT window instruction

Window Speciality Satisfied Test content

Rectangul

Best frequency

resolution, worst

magnitude resolution.

This is essentially the

same as no window.

Symmetric transients or

bursts.

Equal-amplitude sine waves

with fixed frequencies.

Broadband random noise with

a relatively slowly varying

spectrum.

Hanning

Hamming

Better frequency,

poorer magnitude

accuracy than

Rectangular.

Hamming has slightly

better frequency

resolution than

Hanning.

Sine, periodic, and

narrow-band random noise.

Asymmetic transients or

bursts.

Blackman Best magnitude,

worst frequency

resolution.

Single frequency waveforms,

to find higher order harmonics.

4. 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, press this option

button to select “1X”, “2X”, “5X” or “10X”. Moreover, you also can turn the “Universal”

knob to magnify FFT waveform horizontally in a 1-2-5 step. To magnify vertically; you

can turn the “Volts/div” knob.

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SIGLENT SDS1000D Manual de usuario Pagina 41