Glossary
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National Instruments Corporation
G-3
channel
Pin or wire lead to which you apply, or from which you read, an analog or
digital signal. Analog signals can be single-ended or differential. For digital
signals, channels are grouped to form ports.
chassis
The enclosure that houses, powers, and controls SCXI modules.
CLK
Clock input signal.
CMRR
Common-Mode Rejection Ratio—A measure of the ability of a differential
amplifier to reject interference from a common-mode signal, usually
expressed in decibels (dB).
CMV
See
common-mode voltage
Voltage that appears on both inputs of a differential amplifier.
compressive strain
Strain that results from an object being compressed; has a negative value.
current excitation
A source that supplies the current needed by a sensor for its proper
operation.
cutoff frequency
The frequency that defines the upper end of the passband of a lowpass filter.
D
D/A
Digital-to-analog.
D*/A
Data/Address.
D GND
Digital ground signal.
DAC
D/A Converter—an electronic device, often an integrated circuit, that
converts a digital number into a corresponding analog voltage or current.
DAQ
Data AcQuisition—(1) Collecting and measuring electrical signals from
sensors, transducers, and test probes or fixtures and processing the
measurement data using a computer.
(2) Collecting and measuring the same kinds of electrical signals with A/D
and/or DIO boards plugged into a computer, and possibly generating
control signals with D/A and/or DIO boards in the same computer.
DAQ device
A data acquisition device.
