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Glossary
PCI-6023E/6024E/6025E User Manual G-12
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National Instruments Corporation
pulse trains multiple pulses
pulsed output a form of counter signal generation by which a pulse is outputted when a
counter reaches a certain value
Q
quantization error the inherent uncertainty in digitizing an analog value due to the finite
resolution of the conversion process
R
RAM random-access memory
real time a property of an event or system in which data is processed as it is acquired
instead of being accumulated and processed at a later time
referenced signal
sources
signal sources with voltage signals that are referenced to a system ground,
such as the earth or a building ground. Also called grounded signal sources.
relative accuracy a measure in LSB of the accuracy of an ADC. It includes all non-linearity
and quantization errors. It does not include offset and gain errors of the
circuitry feeding the ADC.
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.
ribbon cable a flat cable in which the conductors are side by side
rise time the difference in time between the 10% and 90% points of a system’s step
response
rms root mean square—the square root of the average value of the square of the
instantaneous signal amplitude; a measure of signal amplitude
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.
PCI.book Page 12 Wednesday, September 16, 1998 9:09 AM