226 Chapter 2
Front-Panel Key Reference
Trig
RF Burst Option B7E (RF Communications Hardware) only. Allows the analyzer
to be triggered by an RF burst envelope signal. The trigger level can be
set to either a level relative to the peak of the burst or to an absolute
value.
Key Access:
Trig
Trig Delay
On Off
Allows you to set and turn on or off a delay, during which the analyzer
will wait to begin a sweep after receiving an external trigger signal.
This function is not available when
Gate is on. Trig Delay is active when
External is selected.
Key Access:
Trig, More
NOTE This function is not available in Free Run or Video Trigger modes.
Trig Offset
On Off
Allows you to set and turn on or off an offset value from the trigger
point of the sweep at which to begin storing data in the trace of the
analyzer. The offset is specified as a function of time, and permits
positive (pre trigger) and negative (post trigger) values to be specified.
Key Access:
Trig, More
NOTE This function is only available when in Zero Span. (It is grayed out
when in swept span.) If this key is pressed in swept spans, the error
message: Trigger Offset unavailable in swept spans is displayed
in the status line. The value and state of Trigger Offset is remembered
if Zero Span is exited and restored when Zero Span is reselected.
NOTE This function is only available with Resolution Bandwidths of 1 kHz or
greater. If this key is pressed when the Resolution Bandwidths is less
than 1 kHz, the error message: Trigger Offset unavailable in
bandwidths < 1 kHz is displayed in the status line. While Trigger
Offset is on, it is not possible for the instrument to be set to a
Resolution Bandwidth less than 1 kHz. Any attempt to do so will cause
the error message: Bandwidths <1 kHz unavailable with Trigger
Offset on to be displayed in the status line.
TV Trig Setup Option B7B (TV Trigger and Picture on Screen) only. Accesses the setup
functions for TV Trigger.
Key Access:
Trig
Field
Allows you to determine how the fields of the TV
picture signal will be affected by the trigger system.
One complete TV image consists of one frame of 525 or
625 horizontal lines depending on the TV standard
being used. Each frame is composed of two fields of
interlacing lines, each consisting of 262 1/2 lines (or 312
1/2 lines). The fields are called Field One and Field
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