Glossary
PCI-4451/4452/4453/4454 User Manual
G-2
www.ni.com
ADC
analog-to-digital converter—an electronic device, often an integrated
circuit, that converts an analog voltage to a digital number
ADC resolution
the size of the discrete steps in the ADCs input-to-output transfer function;
therefore, the smallest voltage difference an ADC can discriminate with a
single measurement
AI Convert
LabVIEW name for CONVERT*. See CONVERT*.
AI Start Trigger
LabVIEW name for TRIG1. See TRIG1.
AI Stop Trigger
LabVIEW name for TRIG2. See TRIG2.
alias
a false lower frequency component that appears in sampled data acquired
at too low a sampling rate
amplification
a type of signal conditioning that improves accuracy in the resulting
digitized signal and reduces noise
amplitude flatness
a measure of how close to constant the gain of a circuit remains over a range
of frequencies
AO Start Trigger
LabVIEW name for WFTRIG. See WFTRIG.
AO Update
LabVIEW name for UPDATE*. See UPDATE*.
asynchronous
(1) hardware—a property of an event that occurs at an arbitrary time,
without synchronization to a reference clock; (2) software—a property of a
function that begins an operation and returns prior to the completion or
termination of the operation
attenuate
to decrease the amplitude of a signal
B
bandwidth
the range of frequencies present in a signal, or the range of frequencies to
which a measuring device can respond
bipolar
a signal range that includes both positive and negative values (for example,
–5 V to +5 V)
BNC
a type of coaxial signal connector
buffer
temporary storage for acquired or generated data (software)
