User manual

Glossary
NI 6034E/6035E/6036E User Manual G-10 ni.com
R
referenced single-ended
configuration
RSE—all measurements are made with respect to a common reference
measurement system or ground; also called a grounded measurement
system
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 wires are lined up, not bunched together
rise time the difference in time between the 10% and 90% points of a system’sstep
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 referenced single-ended configuration
RTSI bus real-time system integration bus—the National Instruments timing bus that
connects DAQ devices directly, for precise synchronization of functions.
For PCI devices, the connection is made by means of connectors on top of
the device. For PXI devices, the connection is made across the PXI trigger
bus.
S
s seconds
S samples
S/s samples per second—used to express the rate at which a DAQ device
samples an analog signal
sample counter the clock that counts the output of the channel clock, in other words, the
number of samples taken. On devices with simultaneous sampling, this
counter counts the output of the scan clock and hence the number of scans.
UM.book Page 10 Monday, May 14, 2001 10:32 AM