DAQ VXI-SC-1102 Instrukcja Obsługi Pobierz pdf (Strona 134)

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/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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DAQ VXI-SC-1102 Instrukcja Obsługi Strona 134