Description of
Triggering in the
8360 B-Series Swept
Signal Generators
The 8360 B-Series swept signal generators follow the SCPI mo del
of triggering. It is a layered mo del with the structure shown in
Figure 1-42.
Figure 1-42. 8360 Simplified Trigger Model
The pro cess of sweeping involves all 3 of these states. The IDLE
state is where the sweep b egins. The IDLE state is left when
the sweep is initiated. This can happen on a con
tinuous basis
(
INIT:CONT ON
) or on a demand basis (
INIT:CONT OFF
). The
functions of continuous and single sweeps are handled by this
command. When the
INIT:CONT ON
command is given, the sweep
is continuously re-initiated. When in the
OFF
state, the sweep is
initiated with the
INIT:IMMediate
command.
Once initiated, the
wait for trigger
state is entered. Here, the trigger
signal selected by the
TRIG:SOURce
command is examined until a
TRUE condition is detected. These trigger signals are:
IMMediate This signal is always TRUE.
EXTernal This is the external trigger input jack. A p ositive
transition on this jack constitutes a TRUE signal.
BUS This signal is the GPIB
<
get
>
(Group Execute
Trigger) message or a *TRG command.
When a TRUE signal is found, the sweep is actually started.
The act of pro ducing the sweep in some cases involves the use
of trigger signals. For example, the stepped and list sweeps
have mo des that allow triggering for p oint-to-point advancement
through the sweep. These trigger signals are selected by individual
TRIG:SOURce
commands in the appropriate subsystems (i.e.
LIST:TRIGger:SOURce and SWEep:TRIGger:SOURce). The
denition of these signals in the swept signal generator cause the
Getting Started Programming 1-117
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