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Glossary
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National Instruments Corporation G-15 PCI-4451/4452 User Manual
R
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
relative accuracy a measure in LSB of the linearity 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.
resource locking a technique whereby a device is signaled not to use its local memory while
the memory is in use from the bus
retry an acknowledge by a destination that signifies that the cycle did not
complete and should be repeated
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
ROM read-only memory
RSE See SE.
RTSI bus real-time system integration bus—the National Instruments timing bus that
connects DAQ boards directly, by means of connectors on top of the boards,
for precise synchronization of functions
S
s seconds
S samples
User.book Page 15 Tuesday, April 14, 1998 10:20 AM