Glossary
©
National Instruments Corporation
G-3
6711/6713/6715 User Manual
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)
CONVERT*
convert signal
counter/timer
a circuit that counts external pulses or clock pulses (timing)
CTR
counter
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
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.
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
DI
digital input
DIFF
differential mode
DIO
digital input/output
DIP
dual inline package
dithering
the addition of Gaussian noise to an analog input signal
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