Anritsu MS2024A/MS2026A User Manual page 168

4-31 Sweep
External
A TTL signal applied to the
sweep to occur. This mode is used in zero span, and triggering occurs on the
rising edge of the signal. After the sweep is complete, the resultant trace is
displayed until the next trigger signal arrives.
Video
This mode is used in zero span to set the power level at which a sweep is
initiated. The power level can be set from –120 dBm to +20 dBm. The trigger is
based on the measured signal level. If no signal reaches or exceeds the trigger
level, there will be no trace on the screen. This mode is used in Zero Span.
Change Trigger Position
This soft key is used in conjunction with video triggering to set the horizontal
position on the display where a signal that meets the video triggering criterion
will be placed. The value can be from 0% to 100%. Zero percent places the
triggering event at the left edge of the screen while 100% places the triggering at
the right edge of the screen. When the trigger position is any value other than
0%, the portion of the trace before the trigger event is displayed very quickly
since the trace data is stored in memory. The portion of the trace after the trigger
point is displayed on the screen at the normal rate as the signal is swept. This
mode is used in Zero Span.
Manual Trigger
Pressing this soft key causes the instrument to make a single sweep when the
instrument is in single sweep mode. This key has no function when the
instrument is in continuous sweep mode.
Back
Returns to the previous menu.
4-56
BNC input connector causes a single
External Trigger
MS20xxA VNA Master UG 10580-00166 Rev. C
Chapter 4 — Spectrum Analyzer