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the window to the frequency at the right side of the window. Divide the
frequency span by 10 to obtain the frequency per division.
Click or tap the Center input field to set the frequency of the frequency-domain
waveform relative to the horizontal center of the screen. You can also use the
corresponding multipurpose knob to set the value. Its range is from 5 Hz to 1
GHz. Click or tap the Span input field to set the frequency span with the pop-up
numeric keypad. You can also use the corresponding multipurpose knob to set
the value. Its range is from 10 Hz to 1 GHz.
• Start-End (start frequency to stop frequency): Start frequency specifies the
frequency at the left side of the window. Click or tap the Start input field to set
the start frequency with the pop-up numeric keypad or use the corresponding
multipurpose knob to set the value. Its range is from 0 Hz to (stop frequency-10
Hz). Stop frequency specifies the frequency at the right side of the window. Click
or tap the End input field to set the stop frequency with the pop-up numeric
keypad or use the corresponding multipurpose knob to set the value. Its range is
from (start frequency+10 Hz) to 1 GHz. By default, it is 10 MHz.
Vertical Scale/Offset
In Unit item, you can select dBm/dBV or Vrms as the unit for Scale and Offset.
For how to set the Scale, refer to the descriptions in
Scale
of "Arithmetic Operation".
For how to set the Offset, refer to the descriptions in
Offset
of "Arithmetic Operation".
Window Function
Spectral leakage can be considerably minimized when a window function is used. The
oscilloscope provides 6 FFT window functions which have different characteristics and
are applicable to measure different waveforms, as shown in the table below. You need
to select the window function according to the characteristics of the waveform to be
measured. Click or tap the Window drop-down button to select the desired window
function.
Table 9.1 Window Function
Window
Function
Characteristics
Waveforms Applicable to the
Window Function
Rectangular
Best frequency resolution
Poorest amplitude resolution
Similar to the situation when no
window is applied.
Transient or short pulse, the signal
levels before and after the
multiplication are basically the same
Sine waveforms with the same
amplitudes and rather similar
frequencies
Math Operation
DHO1000 User Guide
126
Copyright ©RIGOL TECHNOLOGIES CO., LTD. All rights reserved.
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