Rigol DHO900 User Manual page 129

Source
Click or tap the Source drop-down button to select CH1, CH2, CH3, or CH4 as the
source. When a source channel is selected, the selected channel automatically
switches to the ON state.
Auto Set
Click or tap AutoSetting to adjust the vertical scale and the offset of the operation
results to the optimal value according to the current configuration for you to better
observe.
Frequency Range
In X, select "Span-Center" or "Start-End" mode and then configure the frequency
range setting.
• Span-Center (frequency span to center frequency): Span specifies the
frequency range represented by the width from the frequency at the left side of
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 625
MHz. 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 625 MHz.
• 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 625 MHz. 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
For how to set the Offset, refer to the descriptions in
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
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Math Operation
Scale
of "Arithmetic Operation".
Offset of "Arithmetic Operation".
DHO800 User Guide
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