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Trigger
for the Trigger menu, the Gate Source menu, and the Sync Source menu that is part of the Periodic
Timer Trigger Setup menu. That is, if Ext1 trigger level is set to 1v in the Tr igg er menu, it will appear
as 1v in both the Gate Source and the Sync Source menus. For these reasons the trigger settings
commands are not qualified with the measurement name, the way the trigger source commands are.
The settings setup menu can be accessed by pressing the key for the current trigger source a second time.
For example, one press of Video selects the Video trigger as the source. The Video key becomes
highlighted and the hollow arrow on the key turns black. Now a second press of the key takes you into
the Video Trigger Setup menu.
Trigger Setup Parameters:
The following examples show trigger setup parameters using an external trigger source.
Example 1 illustrates the trigger conditions with negative slope and no trigger occurs during trigger
Holdoff time.
Example 2 illustrates the trigger conditions with positive slope, trigger delay, and auto trigger time.
Free Run
Pressing this key, when it is not selected, selects free-run triggering. Free run triggering occurs
immediately after the sweep/measurement is initiated.
Key Path: Trigge r
Example: TRIG:SOUR IMM Swept SA measurement
TRIG:<meas>:SOUR IMM Measurements other than Swept SA
Negative Slope
1.5 V 0.75 V Trigger Level
Auto Trigger Time
Trigger Occurs
Trigger Occurs
Example 1:
Example 2:
Trigger Holdoff Time
Trigger Delay
Positive Slope
Trigger Delay
vsd44
(no level selected)
Sweep occurs
and data
processing
completes.