Glossary
©NationalInstruments Corporation G-9 6023E/6024E/6025EUser Manual
PFI7/STARTSCAN PFI7/start of scan
PFI8/GPCTR0_
SOURCE
PFI8/general purpose counter 0 source
PFI9/GPCTR0_GATE PFI9/generalpurpose counter 0 gate
PGIA programmable gain instrumentation amplifier
port (1) a digital port consisting of multiple I/O lines on a DAQ device
(2)a serial or parallel interface connector on a PC
PPI programmable peripheralinterface
ppm partsper million
pu pullup
pulse trains multiple pulses
Q
quantization error the inherent uncertainty in digitizing an analog value due to the finite
resolutionof the conversion process
R
referenced signal
sources
signalsources with voltage signals that are referenced to a system ground,
suchas the earth or a building ground. Also called grounded signal sources.
resolution the smallest signal increment that can be detected bya measurement
system.Resolution can be expressed in bits, in proportions, or in percent
offull scale. For example, a system has 12-bit resolution, one part in
4,096 resolution, and 0.0244% of full scale.
ribbon cable af lat cable in which the conductors are side by side
rise time the differencein 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