National Instruments PXI-7811 User Manual page 66

CMOS Complementary metal-oxide semiconductor.
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 Any voltage present at the instrumentation amplifier inputs with respect to
voltage amplifier ground.
CompactPCI Refers to the core specification defined by the PCI Industrial Computer
Manufacturer's Group (PICMG).
D
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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