RIGOL DSA875 - Manual (Page 41)

Chapter 6 To Set the Scan Parameters RIGOL
User’s Guide for EMI Test System 6-3
To Configure the Segment Scan Parameters
To Set the Scan Sub-range Parameters
You can set the following parameters in SubRange in the scan parameter editing
interface (Figure 6-1).
1. Sub-range start frequency
Click the Range Start(Hz) box and input the desired start frequency of the
sub-range. The default unit is Hz.
2. Sub-range stop frequency
Click the Range Stop(Hz) box and input the desired stop frequency of the
sub-range. The default unit is Hz.
3. Scan mode
Click the dropdown arrow in the Sweep Mode box to set the scan mode
within the scan sub-range currently selected to Auto or Manual.
 When Auto is selected, the Step Size(Hz) and Meas Time(ms) boxes
are grayed out and disabled. When the pre-scan resolution bandwidth
(Pre-RBW) is set to different value, Step Size(Hz) uses the
corresponding default value.
 When Manual is selected, you can set the Step Size(Hz) and Meas
Time(ms) manually. For the setting methods, refer to the setting of
Sub-range start frequency.
4. Pre-scan resolution bandwidth
Click the Pre-RBW box and the menu as shown below is displayed. You can
set the current scan resolution bandwidth to 10Hz (-3dB), 30Hz (-3dB), 100Hz
(-3dB), 200Hz (-6dB), 300Hz (-3dB), 1kHz (-3dB), 3kHz (-3dB), 9kHz (-6dB),
10kHz (-3dB), 30kHz (-3dB), 100kHz (-3dB), 120kHz (-6dB), 300kHz (-3dB) or
1MHz (-3dB).
When the pre-scan detector (Pre-Det) is set to "Qpeak", only 200Hz (-6dB),
9kHz (-6dB) and 120kHz (-6dB) are available.