National Instruments NI 781xR User Manual
Page 46
Glossary
© National Instruments Corporation
G-5
P
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 workstations.
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.
R
RAM
Random-access memory—The generic term for the read/write memory that
is used in computers. RAM allows bits and bytes to be written to it as well
as read from. Various types of RAM are DRAM, EDO RAM, SRAM, and
VRAM.
resolution
The smallest signal increment that can be detected by a measurement
system. Resolution can be expressed in bits, in proportions, or in percent
of full scale. For example, a system has 12-bit resolution, one part in
4,096 resolution, and 0.0244% of full scale.
RIO
Reconfigurable I/O.
rms
Root mean square.
RSE
Referenced single-ended mode—All measurements are made with respect
to a common reference measurement system or a ground. Also called a
grounded measurement system.