Glossary
X Series User Manual
G-12
ni.com
PFI
Programmable F
u
nction Interface.
PGIA
Programmable Gain Instr
u
mentation Amplifier.
physical channel
See
channel
.
Pl
u
g and Play devices
A specification prepared by Microsoft, Intel, and other PC-related
companies that res
u
lt in PCs with pl
u
g-in devices that can be f
u
lly
config
u
red in software, witho
u
t j
u
mpers or switches on the devices.
posttriggering
The techniq
u
e
u
sed on a DAQ device to acq
u
ire a programmed n
u
mber of
samples after trigger conditions are met.
power so
u
rce
An instr
u
ment that provides one or more so
u
rces of AC or DC power. Also
known as power s
u
pply.
ppm
Parts per million.
pretriggering
The techniq
u
e
u
sed on a DAQ device to keep a contin
u
o
u
s b
u
ffer filled with
data, so that when the trigger conditions are met, the sample incl
u
des the
data leading
u
p to the trigger condition.
p
u
lse
A signal whose amplit
u
de deviates from zero for a short period of time.
p
u
lse width
The time from the rising to the falling slope of a p
u
lse (at 50% amplit
u
de).
PXI Express
PCI Express eXtensions for Instr
u
mentation—The PXI implementation
of PCI Express, a scalable f
u
ll-simplex serial b
u
s standard that operates at
2.5 Gbps and offers both asynchrono
u
s and isochrono
u
s data transfers.
PXI_STAR
A special set of trigger lines in the PXI backplane for high-acc
u
racy device
synchronization with minimal latencies on each PXI slot. Only devices in
the PXI Star controller Slot 2 can set signal on this line. For additional
information concerning PXI star signal specifications and capabilities, read
the PXI Specification located at
www.pxi
s
a.org/
s
pecification
s
.
Q
q
u
adrat
u
re encoder
An encoding techniq
u
e for a rotating device where two tracks of
information are placed on the device, with the signals on the tracks offset
by 90° from each other. This makes it possible to detect the direction of the
motion.
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