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window function according to different waveforms and their
characteristics. Please read the table below carefully to make an
appropriate option according to the input signal.
Window
Applications and Characteristics
Rectangle
These are normally used when the signal is transient
(completely contained in the time-domain window) or known
to have a fundamental frequency component that is an integer
multiple of the fundamental frequency of the window. Signals
other than these types will show varying amounts of spectral
leakage and scallop loss, which can be corrected by selecting
another type of window.
Hanning
These reduce leakage and improve amplitude accuracy.
However, frequency resolution is also reduced.
Hamming
These reduce leakage and improve amplitude accuracy.
However, frequency resolution is also reduced.
Flat Top
This window provides excellent amplitude accuracy with
moderate reduction of leakage, but with reduced frequency
resolution.
Blackman
It reduces the leakage to a minimum, but with reduced
frequency resolution.
Press the Auto set softkey to automatically set the appropriate parameters
for the FFT measurement.
Press the Display softkey to select Split, Full Screen or Exclusive display
mode.
Split: the source channel and the FFT operation results are displayed
separately. The time domain and frequency domain signals are displayed
clearly.
Full Screen: the source channel and the FFT operation results are displayed
in the same window to view the frequency spectrum more clearly and to
perform more precise measurements.
Exclusive: the waveforms of channels are disabled, only the FFT operation
results are displayed in the window to view the frequency spectrum more
clearly and to perform more precise measurements.
Press the Mode softkey to select Normal, Max-Hold or Average. When you
select Average, it is necessary to set the average times.
5. Press the Vertical softkey to enter VERTICAL menu.
Figure 68 VERTICAL Menu
Press the Scale softkey, and then turn the Universal Knob to select the
desired vertical FFT scale
Press the Ref Level softkey, and then turn the Universal Knob to select the
desired vertical FFT offset.
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