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PCI-6023E/6024E/6025E User Manual G-10
©
National Instruments Corporation
noise 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.
nonlatched digital I/O a type of digital acquisition/generation where LabVIEW 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.
nonreferenced signal
sources
signal sources with voltage signals that are not connected to an absolute
reference or system ground. Also called floating signal sources. Some
common example of nonreferenced signal sources are batteries,
transformers, or thermocouples.
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
O
OUT output pin—a counter output pin where the counter can generate various
TTL pulse waveforms
output settling time the amount of time required for the analog output voltage to reach its final
value within specified limits
output slew rate the maximum rate of change of analog output voltage from one level to
another
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 work-stations;
it offers a theoretical maximum transfer rate of 132 Mbytes/s.
peak to peak a measure of signal amplitude; the difference between the highest and
lowest excursions of the signal
PFI programmable function input
PCI.book Page 10 Wednesday, September 16, 1998 9:09 AM