Chapter 2 21
Setting Up the EDGE (with GSM) Mode
Changing the Mode Setup
Trigger
The Trigger key accesses the mode setup menu for the following trigger
source menus:
•
Free Run (Immediate)
• RF Burst
• Video (IF Envlp)
• Ext Front
• Ext Rear
• Frame
Pressing one of the trigger source menu keys will access the trigger
mode setup menu. This menu is used to set the
Delay, Level, and Slope
for each trigger source. Note that the actual trigger source is selected
separately for each measurement (under the
Meas Setup key).
Delay - For trigger delay use positive values. For pre-trigger use
negative values.
Level - For the RF Burst selection, the level is relative to the peak
level of the RF signal. For the
Video selection, the level is the value,
in dBm at the RF input, that will cause the trigger. For the
Ext Front
and Ext Rear selections, the level range is −5 to +5 volts.
Slope Pos Neg - Choose to trigger off of the leading edge
(
Pos) or the trailing edge (Neg) of the burst.
Other keys accessed under the
Trigger key:
•
Trig Holdoff - Sets the period of time before the next trigger can occur.
•
Auto Trig - Acts as a trigger timeout. If no trigger occurs by the
specified time, a trigger is automatically generated.
• Frame Timer - Accesses the menu to manually control the frame
timer:
Period - Sets the period of the frame clock.
Offset - Sets a one-time phase adjustment of the frame clock.
Reset Offset - Resets the display of offset key to 0.
Sync Source - Selects the source used to sync the frame timer (Ext
Front, Ext Rear, or Off).
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