R3131 Spectrum Analyzer Operation Manual
3.3 Menu Function Descriptions
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Aug 28/98
3.3.29 TRIG Key (Trigger)
This section describes the menu displayed when the TRIG key is pressed.
Free Run
Performs sweeps automatically.
Line
Sweeps are synchronized with the AC power supply.
Video
Sweeps are synchronized with the video signal.
Ext
Sweeps are synchronized with the external signal.
Slope +/-
Switches between positive (+) and negative (-) polarities. This
applies only to the video trigger and the external trigger.