4349B
Trigger System
This
section
provides
information
about the
trigger system
of the
4349B.
SCPI denes
the
common
trigger
model
for
several types
of instruments
. The
trigger system
allows you
to have
detailed
control
of
the
measurement process
.
The
description
of
the
following
information
requires
more
technical expertise
than most
other
topics
covered
in
this
chapter.
But you
can avoid
the need
to
learn
the
information
in
this
section
about
using
the
INITiate
commands
for making
measurements.
4349B
Trigger
System
Conguration
The
trigger
system
synchronizes
the
4349B
measurement
with
specied
events
.
An
event
includes
GPIB
trigger
commands
or
an
input
trigger
pulse
input
through
the
External
Trigger
connector
.
The
Trigger
system
also
allows
specifying
the
number
of
times
to
repeat
measurement
and
the
delays
between
measurements
.
Figure 5-6. Trigger System Conguration
Figure 5-6 shows conguration of the 4349B trigger system. Each undashed block
is called a
trigger state
. The 4349B moves between adjacent trigger states depending on its
conditions.
Power ON state is called
idle
state.Y
ou can force
the 4349B to the idle state using the
:ABORt
or
*RST
commands. The
initiate
and
TRIGger Event Detection
state causes the 4349B
program to branch when specied conditions are met or not. The
Sequence Operation
state
signals the instrument hardware to take measurement and listens for the signal that indicates
the measurement has been taken.
Idle State
The trigger system remains in the idle state until it is initiated by
INITiate:IMMediate
or
INITiate:CONTinuous ON
. Once one of these conditions is satised, the trigger system exits
downward to the
initiate state
. Note that
*RST
sets
INITiate:CONTinuous OFF
.
5-38 GPIB Reference
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