Glossary
NI PXI-1042 Series User Manual
G-6
ni.com
System controller
A module configured for installation in Slot 1of a PXI chassis. This device
is unique in the PXI system in that it performs the system controller
functions, including clock sourcing and arbitration for data transfers across
the backplane. Installing such a device into any other slot can damage the
device, the PXI backplane, or both.
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.
T
TTL
Transistor-transistor logic.
U
UL
Underwriter’s Laboratories.
V
V
Volts.
VAC
Volts alternating current.
V
pp
Peak-to-peak voltage.
W
W
Watts.