24 • Operation Theorem
Connecting, Trigger and Synchronize with External DMM
In this example, Agilent
®
33401A 6-1/2 Digital Multimeter (DMM) is used to
demonstrate signal connection for handshaking operation.
The DMM provides two terminals on the rear panel for the handshaking
operation process,
Trig In
and
VM Comp
. The
Trig In
connects to the
Scanner
Advanced
output on switch module, while the
VM Comp
to
Trigger In
. If the
terminal board is used, wire
Trig In
to
TRG_IN
on terminal board, and the
VM
Comp
to
S_ADV
.
Follow the instructions below to ensure the handshake functions properly:
1.
Configure
JYTEK
PXI switch module’s
Trigger In
to rising-edge.
triggered,
Scanner Advanced
output in active-low pulsating
mode with pulse width of at least 2us.
2.
Configure the DMM to wait for external
Trig In
before a
measurement, and generate
VM Comp
after a measurement.
Arm the DMM to wait for the first trigger.
3.
Setup the scanlist and auto-scan mode. The first entry in the
scanlist should be set disable wait for the
Trigger In
, but enable
Scanner Advanced
output. Succeeding entries should enable
both
Trigger In
and
Scanner Advanced
output. Download the
scanlist to the switch module afterward.
4.
Start auto-scan by sending scan start command to the switch
module.
