HP 54645A, User'S And Service Manual

Page: 75 / 301

To define an edge trigger
1
Press
Edge
.
2
Select a channel as the trigger source using either the Select knob or
by pressing a
Trigger Source softkey.
You can choose a channel that is turned off as the source for the edge
trigger.
3
Press one of the Edge softkeys to choose whether the trigger will
occur on the rising or falling edge.
Rotating the Select Knob does not Affect Trigger Channel
When selecting a digital channel as the source, after you have set the edge
trigger condition, and selected another menu, continuously rotating the Select
knob will not affect the channel used for the trigger condition. The trigger edge
is not changed until you select a slope. This frees up the Select knob for other
operations, such as measurements.
To use line triggering
This power line edge triggering, when selected, overrides any other settings.
Do not confuse the power line triggering with TV line triggering.
1
Press
Edge
. Then select Line
.
2
Select the rising or falling edge softkey.
Triggering HP 54645A/D Oscilloscopes
To define an edge trigger
3-16