Glossary
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National Instruments Corporation G-9 BNC-2140 User Manual
peak to peak a measure of signal amplitude; the difference between the highest and
lowest excursions of the signal
pF pico farad—a farad is a unit used to measure capacitance
ppm parts per million
pts points
R
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.
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 see SE
S
s seconds
S samples
SE single-ended—a term used to describe an analog input that is measured
with respect to a common ground
settling time the amount of time required for a voltage to reach its final value within
specified limits
UM.book Page 9 Tuesday, July 14, 1998 10:37 AM