636 Chapter7
Language Reference
TM Trigger Mode
TM Trigger Mode
Syntax
Figure 7-279 TM Syntax
Description
The TM command selects a trigger mode. Selected trigger conditions
must be met in order for a sweep to occur. The available trigger modes
are listed below. When any trigger mode other than free run is selected,
a T appears on the left edge of the display.
Parameters
EXT selects the external mode. Connect an external trigger
source to J5 EXT/GATE TRIG INPUT on the rear panel
of the spectrum analyzer. The source must range from 0
to 5 V (TTL). The trigger occurs on the rising, positive
edge of the signal (about 1.5 V).
FREE selects the free-run mode. Sweep triggers occur as fast
as the spectrum analyzer will allow.
LINE selects the line mode. Sweep triggers occur at intervals
synchronized to the line frequency.
VID selects the video mode. Sweep triggers occur whenever
the positively-sloped part of the input signal passes
through the video trigger level. This trigger level can be
changed (refer to the VTL command), and a dashed line
appears on the screen to denote (approximately) the
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