Glossary
G-8
ni.com
ppm
Parts per million.
PXI
PCI eXtensions for Instrumentation—An open specification that builds on
the CompactPCI specification by adding instrumentation-specific features.
Q
QTR
Terminal for connection to a quarter-bridge completion resistor.
quarter bridge
A Wheatstone bridge consisting of one active strain gauge and three passive
fixed-valued resistors.
quarter-bridge
completion resistor
The bridge completion resistor in series with the active strain gauge in a
quarter-bridge configuration; the quarter-bridge completion resistor must
have the same nominal resistance value as the strain gauge.
R
R
g
Gauge resistance.
R
L
Line resistance.
RMA
Return Material Authorization.
rms
Root Mean Square—The square root of the average value of the square of
the instantaneous signal amplitude; a measure of signal amplitude.
rolloff
The ratio that a system attenuates signals in the stopband with respect to the
passband, usually defined in decibels per octave.
RSVD
Reserved bit, pin, or signal.
RTI
Referred To Input—Calculates a specification relative to the input range.
S
s
Seconds.
S
Samples.
S/s
Samples Per Second—Used to express the rate at which an E/M Series
DAQ device samples an analog signal.