National Instruments DAQ X Series User Manual page 278

Glossary
PFI Programmable Function Interface.
PGIA Programmable Gain Instrumentation Amplifier.
physical channel See channel.
Plug and Play devices A specification prepared by Microsoft, Intel, and other PC-related
companies that result in PCs with plug-in devices that can be fully
configured in software, without jumpers or switches on the devices.
posttriggering The technique used on a DAQ device to acquire a programmed number of
samples after trigger conditions are met.
power source An instrument that provides one or more sources of AC or DC power. Also
known as power supply.
ppm Parts per million.
pretriggering The technique used on a DAQ device to keep a continuous buffer filled with
data, so that when the trigger conditions are met, the sample includes the
data leading up to the trigger condition.
pulse A signal whose amplitude deviates from zero for a short period of time.
pulse width The time from the rising to the falling slope of a pulse (at 50% amplitude).
PXI Express PCI Express eXtensions for Instrumentation—The PXI implementation
of PCI Express, a scalable full-simplex serial bus standard that operates at
2.5 Gbps and offers both asynchronous and isochronous data transfers.
PXI_STAR A special set of trigger lines in the PXI backplane for high-accuracy 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
Q
quadrature encoder An encoding technique 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.
X Series User Manual
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