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SIGLENT
SDS1000CML+/SDS1000DL+ User Manual 25
Table 2-10 FFT window instruction
Window
Speciality
Satisfied Test content
Rectangulr
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.
5. Measuring an FFT Spectrum Using Cursors
You can take two measurements on FFT spectrums: magnitude (in dB) and
frequency (in Hz). Magnitude is referenced to 0 dB, where 0 dB equals 1 VRMS.
You can use the cursors to take measurements at any zoom factor. (Refer to
cursor measure2.11.2)
Use horizontal cursors to measure amplitude and vertical cursors to measure
frequency.
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