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Immediate Triggering (TRIG:SOUR IMM)
TRIG:SOUR IMM sets immediate
(internal)
triggering. The scan list is automatically
advanced through the scan list. This is
the default trigger mode.
External Triggering (TRIG)
TRIG:SOUR EXT sets external
triggering.
The trigger source is a (user supplied)
input to the Event In BNC. Use a +5V
negative-going pulse to trigger.
With two or more switchboxes in a
mainframe, the first switchbox set for
EXT trigger keeps the trigger resource
until the switchbox source is changed
to BUS, HOLD, or IMM.
Chapter 4
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Trigger Hold (TRIG:SOUR HOLD)
TRIG:SOUR HOLD prevents execution
of triggers until trigger source is
changed. Can use TRIG command
to trigger a switchbox set to
TRIG:SOUR HOLD.
NOTE
Operation of switchboxes
with other HP command
modules (e.g., the HP
E1406) is the same.
Figure 4-2. Trigger Sources for Scanning
Understanding the HP E1346A Multiplexer
Advancing Scan (TRIG)
Can use TRIG command to
advance the scan list when
switchbox is in
TRIG:SOUR HOLD or
TRIG:SOUR BUS. For either
trigger source, the scan list
advances one channel per
TRIG command.
Bus Triggering
(TRIG:SOUR BUS)
TRIG:SOUR BUS defines
trigger source as a *TRG or
GET command executed over
HP-IB. With TRIG:SOUR
BUS,
the scan list is advanced for
each *TRG or GET command
received.
Enabling Trig Out Port
(OUTP ON)
The Trig Out Port is shared by
all instruments in the
mainframe. With the port
enabled (with OUTP ON), it
generates an output trigger
each time after a channel
closure for ANY switchbox in
the mainframe. The Trig Out
Port outputs a +5V
negative-going pulse.
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