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PCI-4451/4452 User Manual G-2
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National Instruments Corporation
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 ADC’s 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. SeeTRIG2
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*
ASIC Application-Specific Integrated Circuit—a proprietary semiconductor
component designed and manufactured to perform a set of specific
functions for a specific customer
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
attenuation ratio the factor by which a signal’s amplitude is decreased
User.book Page 2 Tuesday, April 14, 1998 10:20 AM