B&K Precision 2532B - Manual - Manual (Page 61)

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The feature is very useful because you can see the events that led
up the trigger point. Everything to the right of the trigger point is
the post-trigger information. The amount of delay range (pre-
trigger and post-trigger information) available is dependent on the
sweep speed selected.
Signal Source
You can use the Trigger Source options to select the signal that the
oscilloscope uses as a trigger. The source can be any signal connected to a
channel BNC, to the EXT TRIG BUS, or the AC power line (available only
with Edge Trigger).
Trigger Type
The scopes have five trigger types: Edge, Video, Pulse, Slope, and
Alternative.
Edge Trigger
Use Edge triggering to trigger on the edge of the oscilloscope input signal
at the trigger threshold.