182 Keysight InfiniiVision 3000T X-Series Oscilloscopes User's Guide
11 Triggers
 
If all channels in the OR trigger are set to don't care, the oscilloscope will not 
trigger.
6 To set all analog and digital channels to the edge selected by the Slope softkey, 
press the Set all Edges softkey.
Rise/Fall Time Trigger
The Rise/Fall Time trigger looks for a rising or falling transition from one level to 
another level in greater than or less than a certain amount of time.
1 Press the [Trigger] key.
High level
Low level
Rising edge time Falling edge time