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Glossary
© National Instruments Corporation G-3 NI 6013/6014 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)
common-mode signal any voltage present at the instrumentation amplifier inputs with respect to
amplifier ground
CONVERT* convert signal
counter/timer a circuit that counts external pulses or clock pulses (timing)
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
DAC0OUT analog channel 0 output signal
DAC1OUT analog channel 1 output signal
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
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
differential input an analog input consisting of two terminals, both of which are isolated from
computer ground, whose difference is measured
DIO digital input/output