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All modules except the “system module” need to be set to use the VXI TTL
trigger lines as the clock source. Use hpe1432_setClockSource for this.
Set the “system module” to output the clock. Use hpe1432_setClockMaster
for this. After this is done, all system sync pulses come from the “system
module” and drive the measurement state machines on all boards in the
group.
Possible Trigger Line Conflict
The following describes a scenario where HP E1432A modules might conflict
and prevent a proper measurement. The conditions allowing the conflict
are complex but must be understood by the user.
After a measurement has completed, the modules are left set up. If a
module (call it module ‘A’) is driving the TTL trigger lines and a different
group is started which also drives the TTL trigger lines (and that different
group does not include module ‘A’), then module ‘A’ will conflict and
prevent the other group from functioning. In this case make a call to
hpe1432_finishMeasure (using the old group ID which includes ‘A’) to turn
off module ‘A’ and allow the new group to function.
Note that if the new group includes all modules of the old group, the
conflict will not occur since hpe1432_initMeasure will reset all modules as
needed. Also note that single-module groups do not drive the TTL trigger
lines, so single-module groups are immune from causing or receiving this
conflict.
HP E1432A User's Guide
Using the HP E1432A
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