User`s guide

5Key Reference
130 N9340B User’s Guide
Hz. For long demodulation times, pressing Preset
when Preset Type is set to DFT will abort the Demod
function. The default value is 2 ms.
Trigger
Key access: [SPAN] > {Trigger}
Accesses the menu of keys that allow you to select
the trigger mode of the analyzer. This softkey is
only available in zero span.
Free Run
Key access: [SPAN] > {Trigger} > {Free Run}
New sweep starts as soon as possible after the
current sweep ends. This is the default state of
trigger mode.
Video
Key access: [SPAN] > {Trigger} > {Video}
Activates the trigger condition that starts the next
sweep if the detected RF envelope voltage rises to
a level set by the video trigger level.
NOTE
It is normal to hear clicking sounds when the Auto Alignment
function is On. During retrace, a small portion of the analyzer
circuitry is realigned. Some of the switching of the analyzer
circuitry is done using relays. It is the rapid switching of these
relays during retrace that causes the clicking sounds. To
eliminate the clicking sounds, turn the auto alignment off by
pressing System, Alignments, Auto Align, Off.
When this is done, the Align Now, All function should be
performed periodically. Refer to the Specifications Guide for
your instrument to learn more information on how often to
perform Align Now, All when the auto alignment is off.