User manual

Glossary
NI-DAQ User Manual for PC Compatibles G-2 ni.com
ACK acknowledge
ActiveX A programming system and user interface that lets you work with
interactive objects. Formerly called OLE.
ActiveX control a standard software tool that adds additional functionality to any
compatible ActiveX container
ADC A/D converter—an electronic device, often an integrated circuit, that
converts an analog voltage to a digital number
ADC resolution The resolution of the ADC, which is measured in bits. An ADC with 16 bits
has a higher resolution, and thus a higher degree of accuracy, than a 12-bit
ADC.
AI analog input
AMD Advanced Micro Devices
analog trigger A trigger that occurs at a user-selected point on an incoming analog signal.
Triggering can be set to occur at a specific level on either an increasing
or a decreasing signal (positive or negative slope). Analog triggering can
be implemented either in software or in hardware. When implemented
in software (LabVIEW), all data is collected, transferred into system
memory, and analyzed for the trigger condition. When analog triggering
is implemented in hardware, no data is transferred to system memory
until the trigger condition has occurred.
API application programming interface
ARB pertaining to arbitrary waveform generation (NI 54XX devices only)
asynchronous (1) hardware—a property of an event that occurs at an arbitrary time,
without synchronization to a reference clock
(2) software—an action or event that occurs at an unpredictable time
with respect to the execution of a program
B
background acquisition Data is acquired by a DAQ system while another program or processing
routine is running without apparent interruption
bandwidth the range of frequencies present in a signal, or the range of frequencies to
which a measuring device can respond