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Glossary
peak to peak
PFI
Plug and Play devices
port
posttriggering
potentiometer
ppm
pretriggering
propagation
propagation delay
pts
pulse trains
pulsed output
Q
quantization error
quantizer
PCI-4451/4452 User Manual
a measure of signal amplitude; the difference between the highest and
lowest excursions of the signal
programmable function input
devices that do not require DIP switches or jumpers to configure resources
on the devices—also called switchless devices
(1) a communications connection on a computer or a remote controller
(2) a digital port, consisting of four or eight lines of digital input and/or
output
the technique used on a DAQ board to acquire a programmed number of
samples after trigger conditions are met
an electrical device the resistance of which can be manually adjusted; used
for manual adjustment of electrical circuits and as a transducer for linear or
rotary position
parts per million
the technique used on a DAQ board to keep a continuous buffer filled with
data, so that when the trigger conditions are met, the sample includes the
data leading up to the trigger condition
the transmission of a signal through a computer system
the amount of time required for a signal to pass through a circuit
points
multiple pulses
a form of counter signal generation by which a pulse is outputted when a
counter reaches a certain value
the inherent uncertainty in digitizing an analog value due to the finite
resolution of the conversion process
a device that maps a variable from a continuous distribution to a discrete
distribution
G-14
© National Instruments Corporation
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