Trigger Menu In Zero Span - Anritsu Field Master Pro MS2090A Measurement Manual

Making Spectrum Analyzer Measurements

TRIGGER Menu in Zero Span

Figure 3-41. TRIGGER Menu in Zero Span
Positive Edge
High Threshold
Hysteresis Level
Low Threshold
Figure 3-42. Trigger Levels and Hysteresis
Spectrum Analyzer MG
SOURCE: The SOURCE button offers several triggering options depending on which
view mode the instrument is set:
• Free Run: A new sweep is started immediately upon completion of the current
sweep. No trigger event is required to initiate a sweep.
• Video: Available only in zero span. When enabled, the trigger level will be
indicated graphically on the display with a horizontal VIDEO line. A new sweep is
started when the input video level meets the value set via the LEVEL button. The
level can also be adjusted by dragging the VIDEO line up or down. Video triggering
is useful for monitoring a known frequency and its time transients, such as pulsed
signal rise or fall times.
• External 1 or 2: A TTL signal applied to the selected External Trigger SMA input
connector causes a single sweep. After the sweep is complete, the resultant trace
is continuously displayed until the next trigger signal is received.
LEVEL: Used in zero span mode when the trigger source is set to Video. Sets the video
trigger level threshold that initiates a sweep. The level crossing applies to rising or falling
edges. Use the hysteresis setting below to adjust the sensitivity of the trigger level.
HOLDOFF: Available only when the trigger source is set to External or Video. When
toggled on, the analyzer waits the user defined amount of time to re-arm the trigger
between trigger events. If a trigger event is received after the previous trigger, but before
the holdoff time has elapsed, that trigger event will be ignored.
PERIODIC: Used to set a periodic sweep trigger. When toggled on, the instrument waits
the set time to start a sweep.
SLOPE: Used when the trigger source is set to External or Video. Sets the trigger slope
to rising or falling edge.
HYSTERESIS: Hysteresis is used to address noisy trigger signals. The hysteresis
setting adjusts the sensitivity of the trigger system (the difference between the firing level
and the arming level as shown in
and firing levels close to each other, meaning a small signal change will cause a trigger. A
large hysteresis value sets the arming and firing levels far apart, meaning a large signal
change will be required to cause a trigger.
Trigger
PN: 10580-00447 Rev. A
Figure 3-42). A low hysteresis value sets the arming
Not Triggered
Negative Edge
Trigger
3-11 Setting Up Triggering
3-55