Specifications

Chapter 15 153
Concepts
Trigger Concepts
Concepts
Trigger Concepts
Selecting a Trigger
NOTE If you are using an ESA with firmware revision A.07.xx or lower, you
can use video and external triggering as set up below in numbers 1 and
2. If you have firmware A.08.xx or later and Option B7E with board
part number E4401-60224 or higher, RF burst triggering is also
available (recommended for this example). PSA can use video, external
and RF burst triggering.
To determine the ESA firmware revision number and hardware board
part number:
Press
System, More, Show System.
Press System, More, Show Hdwr.
1. Video Triggering
Video triggering controls the sweep time based on the detected and
VBW filtered envelop signal to steady the bursted signal on the
display and to synchronize the measurement with the burst of
interest. Video triggering triggers the measurement at the point at
which the rising signal crosses the video trigger horizontal green line
on the display:
Press
Trig, Video, −30, dBm.
2. External Triggering
In the event that you have an external trigger available that can be
used to synchronize with the burst of interest, connect the trigger
signal to the rear of the ESA using the GATE TRIG/EXT TRIG IN
(TTL) input connector. For the PSA use either the trigger input
connector on the front (EXT TRIGGER IN) or the rear (TRIGGER IN) of
the instrument. It might be necessary to adjust the trigger level (as
indicated by the lower horizontal green line) by rotating the front
panel knob or by entering the numeric value on the keypad.
(ESA) Press
Trig, External.
(PSA) Press
Trig, Ext Front or Ext Rear.
3. RF Burst Triggering
RF burst triggering occurs in the IF circuitry chain, as opposed to
after the video detection circuitry with video triggering. In the event
video triggering is used, the detection filters are limited to the
maximum width of the resolution bandwidth filters. Set the analyzer
in RF burst trigger mode (RF burst is a default trigger for PSA):
Press
Trig, RF Burst.