National Instruments DAQPad-6508 User Manual page 79

Glossary
NIST
nodes
noise
nonlatched digital I/O
nonreferenced signal
sources
O
OBF*
OBFA*
OBFB*
onboard channels
onboard RAM
OpenDoc
operating system
optical coupler
DAQPad-6507/6508 User Manual
National Institute of Standards and Technology
execution elements of a block diagram consisting of functions, structures,
and subVIs
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.
a type of digital acquisition/generation where LabVIEW and NI-DAQ
updates the digital lines or port states immediately or returns the digital
value of an input line. Also called immediate digital I/O or
non-handshaking.
signal sources with voltage signals that are not connected to an absolute
reference or system ground. Also called floating signal sources.
Some common examples of nonreferenced signal sources are batteries,
transformers, or thermocouples.
output buffer full signal
output buffer bit for Port A
output buffer bit for Port B
channels provided by the plug-in data acquisition board
optional RAM usually installed into SIMM slots
a compound document architecture created by the joining of several
technologies supplied by Apple (the base OpenDoc architecture, the Bento
file system and the Open Scripting Architecture) and IBM (the System
Object Model)
base-level software that controls a computer, runs programs, interacts with
users, and communicates with installed hardware or peripheral devices
a device designed to transfer electrical signals by utilizing light waves
G-14 © National Instruments Corporation