Glossary
©
National Instruments Corporation
G-7
SCXI-1581 User Manual
noise
an undesirable electrical signal—noise comes from external sources such
as AC power lines, motors, generators, transformers, fluorescent lights,
soldering irons, CRT displays, computers, electrical storms, arc welders,
radio transmitters, and internal sources such as semiconductors, resistors,
and capacitors. Noise corrupts signals you are measuring.
nonlinearity
for an amplifier, a measure of the maximum output deviation from an ideal
linear response in units of percent relative to full scale. The ideal linear
response is taken to be a straight line on a plot of measured output voltage
to measured input voltage with the ends of the line connecting the extremes
of the plot at the full-scale limits.
NRSE
nonreferenced single-ended mode—all measurements are made with
respect to a common measurement system reference, but the voltage at this
reference can vary with respect to the measurement system ground
O
offset error
the output of a system with a zero-volt input
OUT
output signal
OUTPUT
output signal
output voltage
compliance
the largest voltage that can be generated across the output of a current
source without the current going out of specification
OUTREF
output reference signal
overvoltage protection
maximum voltage that will not cause hardware damage
P
parallel mode
a type of SCXI operating mode in which the module sends each of its
output channels directly to a separate analog input channel of the E Series
DAQ device connected to the module
port
(1) a digital port consisting of multiple I/O lines on a E Series DAQ device;
(2) a serial or parallel interface connector on a PC
ppm
parts per million
PXI
PCI eXtensions for Instrumentation—an open specification that builds on
the CompactPCI specification by adding instrumentation-specific features