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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.

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.