Triggering can be done in frequency domain (e.g. scanning a certain span) or in time domain (e.g. with zero span). Triggering in frequency domain can be slow due to the time required to scan the frequency span.
AUTO is the normal spectrum analyzer scanning mode, triggering is not active.
NORMAL will display a new scan as soon as a signal in the scan causes a trigger event.
SINGLE will wait for a signal to cause a trigger event and display the scan. Restart the waiting for an event by activating SINGLE again.
LEVEL activates a keypad for entering the trigger level. The specified trigger level will be shown in the status panel and as a blue line.
UP EDGE generates a trigger event when the input level goes from below the set trigger level to above the set trigger level.
DOWN EDGE generates a trigger event when the input level goes from above the set trigger level to below the set trigger level.
BACK returns to the input menu.
The active trigger level is shown on the screen as a blue line and in the status at the left. The trigger level in the status is shown in red when waiting for the trigger to happen and in green when a single trigger happened.