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National Instruments PCI-6023E User Manual

Page 119

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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

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