National Instruments NI 783xR Benutzerhandbuch

© National Instruments Corporation

noise

An undesirable electrical signal—Noise comes from external sources such 
as the AC power line, motors, generators, transformers, fluorescent lights, 
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.

NRSE

Nonreferenced single-ended mode—All measurements are made with 
respect to a common (NRSE) measurement system reference, but the 
voltage at this reference can vary with respect to the measurement system 
ground.

OUT

Output pin—A counter output pin where the counter can generate various 
TTL pulse waveforms.

PCI

Peripheral Component Interconnect—A high-performance expansion bus 
architecture originally developed by Intel to replace ISA and EISA. It is 
achieving widespread acceptance as a standard for PCs and work-stations. 
PCI offers a theoretical maximum transfer rate of 132 MB/s.

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.

pu

Pull-up.

PWM

Pulse-width modulation.

PXI

PCI eXtensions for Instrumentation—An open specification that builds off 
the CompactPCI specification by adding instrumentation-specific features.