Glossary
NI PXI-1056 User Manual G-6 ni.com
PXI PCI eXtensions for Instrumentation. PXI is an implementation of
CompactPCI with added electrical features that meet the high performance
requirements of instrumentation applications by providing triggering, local
buses, and system clock capabilities.
PXI_CLK10 10 MHz PXI system reference clock.
R
RMS Root mean square.
S
s Seconds.
skew Deviation in signal transmission times.
slot blocker An assembly installed into an empty slot to improve the airflow in adjacent
slots.
ST Star trigger.
standby The backplane is unpowered (off), but the chassis is still connected to
AC power m ains.
star trigger slot This slot is located at slot 2 and has a dedicated trigger line between each
peripheral slot. Use this slot for a module with ST functionality that can
provide individual triggers to all other peripherals.
system reference
clock
A 10 MHz clock, also called PXI_CLK10, that is distributed to all
peripheral slots in the chassis, as well as a BNC connector on the rear of
chassis labeled 10 MHz REF OUT. The system reference clock can be used
for synchronization of multiple modules in a measurement or control
system. The 10 MHz REF IN and OUT BNC connectors on the rear of the
chassis can be used to synchronize multiple chassis to one reference clock.
The PXI backplane specification defines implementation guidelines for
PXI_CLK10.