RIGOL MSO/DS2000A Series - Manual (Page 116)

RIGOL Chapter 5 To Trigger the Oscilloscope
5-30 MSO2000A/DS2000A User’s Guide
Trigger Setting:
Press Setting to set the trigger parameters (trigger holdoff and noise rejection)
under this trigger type.
Note: Noise rejection is grayed out and disabled automatically when the signal
source is set to any channel of D0-D15.
Trigger Level:
Press SourceA and use TRIGGER LEVEL to modify the trigger level of source A.
Press SourceB and use TRIGGER LEVEL to modify the trigger level of source B.
For the details, please refer to the introduction of “ Trigger Level”.