User manual

Glossary

PCI Peripheral Component Interconnect

port a digital port, consisting of four or eight lines of digital input and/or output

posttriggering the technique used on a DAQ board to acquire a programmed number of

samples after trigger conditions are met

PPS Pulse per second. A signal normally produced by a GPS receiver.

pretriggering the technique used on a DAQ board to keep a continuous buffer filled with

data, so that when the trigger conditions are met, the sample includes the

data leading up to the trigger condition

programmed I/O the standard method a CPU uses to access an I/O device—each byte of data

is read or written by the CPU

pts points

PXI PCI eXtensions for Instrumentation. PXI is an open specification that

builds off the CompactPCI specification by adding

instrumentation-specific features.

RAM random-access memory

remote SCXI An SCXI configuration in which a serial port cable is connected to an

SCXI-2000 chassis or an SCXI-100X chassis with an SCXI-2400 remote

communications module. Multiple Remote SCXI units can be connected

to one serial port in a PC by using RS-485. You can use either an RS-485

interface card in your PC or an RS-485 converter on the RS-232 port.

REQ request

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.

ROM read-only memory

RTC Real time clock. A clock capable of recording the exact time of events that

counts time in days, hours, minutes, seconds, and fractions of seconds.