Boonton 4500B Peak Power Meter - Manual (Page 115)

Boonton 4500B RF Peak Power Analyzer
Operation 4-43
4.11 TRIG Key and Trig > Menu
The TRIG key activates the Trig > menu (Figure 4-27), which enables you to specify the trigger
parameters. Table 4-9 describes the functions that appear in the Trig > menu.
When in the Pulse measurement mode, a trigger signal is required to produce a sweep. The source
of this trigger can be any of the measurement channels or an external logic or analog baseband
signal. To assist the user in setting up the trigger, the Auto Trigger modes will create a pseudo
trigger if the selected source and trigger conditions do not result in an actual trigger. The
Auto Peak-to-Peak trigger mode will automatically adjust trigger level while attempting to obtain
a useable trigger. As a result, for many signals, it functions as a fully automatic trigger system.
The Auto trigger mode does not adjust trigger level, but otherwise operates as described above.
Both Auto trigger modes will try not to interfere with trigger conditions selected by the user if a
trigger is generated by those settings. Unfortunately, this is not possible for all signal conditions.
The Normal trigger mode will not interfere with user settings even if no trigger is generated.
The Free Run mode causes horizontal sweeps to be generated asynchronously, without regard to
trigger conditions.
A trigger is not needed for the free running Modulated mode. It runs continuously. A trigger can
be used to synchronously start a stopped Modulated mode measurement. After starting, it runs
until stopped.
A trigger is not needed for non-gated Statistical mode. It is started by command and terminates
according to the conditions set. The gated Statistical mode uses the trigger system described
above to select the parts of the signal to analyze. In this instance the Trig > Menu becomes a
submenu of Trig > Trig Setup (Trig A).
Note
Stat* in Table 4-9 & 4-9A applies only to the Trigger Setup submenu of the Pulse Gated
Statistical submode.
Fig 4-27a. Trig > menu
Pulse mode; Auto trigger
Table 4-9. Trig > Menu
Menu Item
(Type) Selections Function
Trig Mode
Pulse, Mod & Stat* Select the trigger system mode of operation
(Mult. Choice) Auto Pk/Pk, Auto,
Normal, Free Run
Press the Trig > Trig Mode menu key to select the desired mode of
trigger system operation.
Auto creates horizontal sweep in the absence of a trigger signal. For
trigger rates below approximately 10 Hz, the Auto trigger may interfere
with the desired trigger. Use Normal mode if this occurs.