929955-00 Rev A
26
Select
Trigger Mode
:
Auto – trigger after preset period if no valid trigger.
Normal – trigger repeatedly when all conditions met.
Single – trigger once when all conditions met.
Stop – stop acquisition.
Open Trigger
setup dialog.
Trigger
fired.
Trigger
armed.
Raise/lower
trigger Volt/
Amp
Level
.
Push to
Find Level
.
BASICS
Triggers tell the oscilloscope when to perform an acquisition. The acquisition starts as soon as the trigger is armed
and
all trigger conditions are met,
unless postponed by a Holdoff count of time or number of trigger events. Trigger types and modes are described at more length in the
HDO4000A
Oscilloscopes Operator’s Manual.
Trigger
Trigger Source
Trigger Mode
Trigger Type
Trigger Slope
Trigger Level
Trigger Coupling
Level
Position
Pre/Post-Trigger
–
appears at corner of grid
when trigger point is no-longer visible
.
From the Front Panel
Trigger Descriptor Box
Trigger Indicators
