DAQ VXI-SC-1102 Manual de Instruções Página 134

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Glossary
DAQ Hardware Overview Guide G-4 www.ni.com
conversion A signal that initiates individual A/D conversions.
conversion pulse A signal that generates a pulse once every sample interval, initiating an A/D
conversion.
conversion time The time required, in an analog input or output system, from the moment a
channel is interrogated (such as with a read instruction) to the moment that
accurate data is available.
counter/timer A circuit that counts external pulses or clock pulses (timing).
coupling The manner in which a signal is connected from one location to another.
CPU central processing unit
D
D/A digital-to-analog
DAC D/A converter. An electronic device, often an integrated circuit, that
converts a digital number into a corresponding analog voltage or current.
DAQ Data acquisition. (1) Collecting and measuring electrical signals from
sensors, transducers, and test probes or fixtures and inputting them to a
computer for processing. (2) Collecting and measuring the same kinds of
electrical signals with A/D and/or DIO devices plugged into a PC, and
possibly generating control signals with D/A and/or DIO devices in the
same PC.
DAQ-STC Data acquisition system timing controller. An application-specific
integrated circuit (ASIC) for the system timing requirements of a general
A/D and D/A system, such as a system containing the National Instruments
E Series devices.
DC direct current
DDS Direct Digital Synthesis
device Device is used to refer to a DAQ device inside your computer or attached
directly to your computer via a parallel port. Plug-in devices, PCMCIA
cards, and devices such as the DAQPad-1200, which connects to your
computer parallel port, are all examples of DAQ devices. SCXI modules are
distinct from devices, with the exception of the SCXI-1200 and
SCXI-2400, which are hybrids.
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