Rigol MSO4000 Series User Manual page 372

RIGOL
can the waveform be displayed stably.
(3) Check the trigger level: adjust the trigger level to the middle position of the
signal.
(4) Change the trigger coupling type: if edge trigger is currently selected, press
MENU (in the trigger control area (TRIGGER) at the front panel) 
Setting  Coupling to select "HF Reject" or "LF Reject" to filter out the
high-frequency or low-frequency noise that disturbs the trigger.
(5) Change the trigger holdoff setting.
5. No display after pressing RUN/STOP:
Check the trigger control area (TRIGGER) at the front panel to check whether the
trigger mode is "Normal" or "Single" and whether the trigger level exceeds the
waveform range. If yes, set the trigger level to the middle or set the trigger mode
to "Auto".
Note: Using AUTO could automatically finish the above setting.
6. The waveform displayed is ladder-like:
(1) The horizontal time base might be too low. Increase the horizontal time
base properly to improve the display.
(2) If the display type is "Vectors", the lines between the sample points may
cause ladder-like display. Press Display  Type to set the display type to
"Dots" to solve the problem.
7. Digital waveform is not stable:
(1) Check whether the signal input from the selected trigger source is
synchronized with the digital signal.
(2) Adjust the oscilloscope to select the appropriate trigger mode, time base
and other general settings.
(3) If the display is still not stable, please check the electrical connections and
parameter settings again.
(4) Try to use other probe (such as analog probe) to verify the signal status of
the test point.
8. Fail to connect PC or PictBridge printer through USB:
(1) Press Utility  IO Setting to check whether the setting in USB Device
matches the device currently connected.
(2) Check whether the USB cable is in good condition and whether it is properly
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Chapter 16 Troubleshooting
MSO4000/DS4000 User's Guide
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