National Instruments PCI-4451 Manual de usuario descargar pdf (Pagina 90)

Glossary

PCI-4451/4452 User Manual G-2

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

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National Instruments PCI-4451 Manual de usuario Pagina 90