Keysight E4980A User Manual page 247

Overview of Remote Control
Trigger System
Trigger Source
External trigger 
(External)
Bus trigger
(Bus)
Manual trigger
(Man)
When the sweep averaging function is on, even if the instrument is set so
that the trigger is detected for each sweep, the sweep is performed
repeatedly until the sweep averaging for a specified number of times
finishes. This is done by triggering the instrument once at the beginning or
executing the : TRIG command.
There are three kinds of trigger commands: the *TRG common command, the
TRIGGER (GET) bus command, and the :TRG GPIB command. These
commands are classified into two types in this trigger system. (Refer to
8-13).
Figure 8-13 Trigger system and trigger commands
1. :TRIG GPIB command
2. *TRG command or TRIGGER (GET) bus command
Keysight E4980A/AL Precision LCR Meter
How instrument is triggered
The instrument is triggered when a trigger signal is input
through the external trigger terminal, the handler I/O port,
or the scanner I/O port.
The instrument is triggered when the *TRG command or
TRIGGER (GET) bus command is issued.
The instrument is triggered when you press [Trigger] on
the front panel.
When the trigger system is either in the "Waiting for Trigger" or "Idle" state,
the E4980A/AL is triggered by sending the :TRIG command. When reading
measurement results via a controller in the "Idle" state, you need to use the
:FETch? query command.
Figure
247