National Instruments DAQPad-1200, User Manual

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Glossary
© National Instruments Corporation G-3 DAQCard-1200 User Manual
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)
D
D/A digital-to-analog
DAC digital-to-analog converter
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 computer,
and possibly generating control signals with D/A and/or DIO devices in the
same computer
DATA Data Lines at the Specified Port — the signal that indicates when teh data on
the data lines at a specified port is or should be available
dB decibel
DC direct current
DGND digital ground signal
DI digital input
DIFF differential input mode
DIN digital input signal
DIO digital input/output
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 least significant bit of the
worst-case deviation of code widths from their ideal value of 1 LSB