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External Trigger
Master-Slave
Operation
Trigger Mode
NORMal Mode
MASTer Mode
30 Digitizer Application Information
You can provide an external trigger common to all channels. The external
trigger connection is on the digitizer's front panel D-subminiature connector
"Trig" pin. You set this input as the trigger source for all channels using the
TRIGger:SOURce<n> EXT
POSitive | NEGative
command to set which signal edge will trigger.
The HP E1563A and HP E1564A Digitizers can be configured in a
master-slave configuration. This configuration allows a master module and
one or more slave modules to have their measurements synchronized.
Synchronization occurs by having all channels trigger off of the same trigger
event as well as all channels sampling from one sample signal.
•
The sample synchronization signal is always generated by the master.
•
The TTL trigger event can be generated by either the master module or
any of the slave modules. This allows a slave module (as well as the
master module) to use one of the four internal trigger sources or their
external trigger source to trigger a measurement.
Both the trigger signal and the sample signal are put on the VXI backplane
TTL trigger (TTLT) lines where the master module and all slave modules
receive the signals simultaneously. TTL trigger lines are used in pairs
between the master and slave(s) where one TTL trigger line carries the
sample signal and the other carries the trigger signal. The next section
describes how these TTL trigger lines are paired.
The
command is used to configure Digitizers for master-
TRIGger:MODE
slave operation. The mode can be NORMal, MASTer or SLAVe.
The default setting for trigger mode is
configures the module as an individual instrument.
Use the
TRIGger:MODE MASTer<n>
a master. The eight TTL trigger lines (TTLT0-TTLT7) on the VXI
backplane allow four different pairings as shown in Table 2-1 (MASTer0-
SLAVe0, MASTer2-SLAVe2, MASTer4-SLAVe4 and MASTer6-
SLAVe6). You must select an unused set of TTL trigger lines for the
master-slave coupling when determining which master mode to set. Do not
use a TTLT line already used by
command. You use the
TRIGger:MODE NORMal
command to configure a module as
or
SAMPle:SOURce
TRIGger:SLOPe<n>
which
.
TRIGger:SOURce
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