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Glossary
G-6
© National Instruments Corporation
N
NI-DAQ
National Instruments driver software for DAQ hardware, including
computer-based instruments
NIST
National Institute of Standards and Technology
NMR
normal mode rejection
noise
an undesirable signal—Electrical Noise comes from external sources
such as the AC power line, motors, generators, transformers,
fluorescent lights, soldering irons, CRT displays, computers, electrical
storms, welders, radio transmitters, and internal sources such as
semiconductors, resistors, and capacitors. Noise corrupts signals you
are trying to send or receive.
NPN
type of bipolar transistor
NTC
negative temperature coefficient
O
operating system
base-level software that controls a computer, runs programs, interacts
with users, and communicates with installed hardware or peripheral
instruments
P
PC Card
a credit-card-sized expansion card that fits in a PCMCIA slot
PCMCIA
an expansion bus architecture in notebook-size computers. It originated
as a specification for add-on memory cards written by the Personal
Computer Memory Card International Association.
peak-to-peak
a measure of signal amplitude; the difference between the highest and
lowest excursions of the signal
PLC
power line cycles
PLF
power line frequence
Plug and Play
devices that do not require dip switches or jumpers to configure
devices
resources on the instruments—also called switchless instruments