National Instruments NI 781xR Manual do Utilizador descarregar pdf (Página 43)

Glossary

NI 781xR User Manual G-2 © National Instruments Corporation

CMRR Common-mode rejection ratio—A measure of an instrument’s ability to

reject interference from a common-mode signal, usually expressed in

decibels (dB).

common-mode

voltage

Any voltage present at the instrumentation amplifier inputs with respect to

amplifier ground.

CompactPCI Refers to the core specification defined by the PCI Industrial Computer

Manufacturer’s Group (PICMG).

D/A Digital-to-analog.

DAC Digital-to-analog converter—An electronic device, often an integrated

circuit, that converts a digital number into a corresponding analog voltage

or current.

DAQ Data acquisition—A system that uses the computer to collect, receive, and

generate electrical signals.

dB Decibel—The unit for expressing a logarithmic measure of the ratio of

two signal levels: dB = 20log10 V1/V2, for signals in volts.

DC Direct current.

DGND Digital ground signal.

DIFF Differential mode.

DIO Digital input/output.

DIO<i> Digital input/output channel signal.

DMA Direct memory access—A method by which data can be transferred

to/from computer memory from/to a device or memory on the bus while the

processor does something else. DMA is the fastest method of transferring

data to/from computer memory.

DNL Differential nonlinearity—A measure in LSB of the worst-case deviation of

code widths from their ideal value of 1 LSB.

DO Digital output.

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National Instruments NI 781xR Manual do Utilizador Página 43