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Immediate Triggering (TRIG:SOUR IMM)
TRIG:SOUR IMM sets immediate (internal) triggering. The
scan is automatically advanced through the scan list. This is
the default trigger mode.
Trigger Hold (TRIG:SOUR HOLD)
TRIG:SOUR HOLD prevents execution of triggers until the
trigger source is changed. You can use the TRIG command to
trigger a switchbox set to TRIG:SOUR HOLD.
Advancing Scan (TRIG)
You can use the TRIG command to advance the scan list when
the switchbox is set for 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 the trigger source as a *TRG or GET
command executed over GPIB. With TRIG:SOUR BUS, the
scan list is advanced one channel for each *TRG or GET
command received.
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.
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), the port generates a
+5V negative-going output trigger pulse each time after a
channel closure for ANY switchbox in the mainframe.
Figure 4-2. Scanning Trigger Sources
NOTE
Operation of switchboxes with other
Agilent command modules (e.g., E1406)
is the same.
Understanding the Relay Driver Module
49
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