Glossary
©
National Instruments Corporation
G-7
N
NI-DAQmx
The latest NI-DAQ driver with new VIs, functions, and development tools
for controlling measurement devices.
noise
An undesirable electrical signal—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.
normal mode
voltage
Voltage that occurs in the case of interference between two conductors of a
circuit.
O
OUT
Output pin—A counter output pin where the counter can generate various
TTL pulse waveforms.
P
PCI
Peripheral component interconnect.
PFI
Programmable function input.
PGA
Programmable gain amplifier.
port
(1) A communications connection on a computer or a remote controller;
(2) a digital port, consisting of four or eight lines of digital input and/or
output.
ppm
Parts per million.
PXI
PCI eXtensions for Instrumentation—An open specification that builds on
the CompactPCI specification by adding instrumentation-specific features.
PXI trigger bus
The timing bus that connects PXI DAQ devices directly, by means of
connectors built into the backplane of the PXI chassis, for precise
synchronization of functions. This bus is functionally equivalent to the
RTSI bus for PCI DAQ devices.
