RIGOL MSO/DS2000A Series - Manual (Page 93)

Chapter 5 To Trigger the Oscilloscope RIGOL
MSO2000A/DS2000A User’s Guide 5-7
Noise Rejection
Noise rejection can reject the high frequency noise in the signal and reduce the
possibility of miss-trigger of the oscilloscope.
Press MENU  Setting  Noise Reject in the trigger control area (TRIGGER) at
the front panel to enable or disable noise rejection.