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Glossary
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National Instruments Corporation
G-3
channel
pin or wire lead to which you apply or from which you read the analog or
digital signal. Analog signals can be single-ended or differential. For digital
signals, you group channels to form ports. Ports usually consist of either
four or eight digital channels.
clock
hardware component that controls timing for reading from or writing to
groups
CMOS
complimentary metal oxide semiconductor
CMR
common-mode rejection
CompactPCI
refers to the core specification defined by the PCI Industrial Computer
Manufacturer’s Group (PICMG)
coupling
the manner in which a signal is connected from one location to another
CPU
central processing unit
D
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:
for signals in volts
DC
direct current
DC coupled
allowing the transmission of both AC and DC signals
device
a plug-in data acquisition product, card, or pad that can contain multiple
channels and conversion devices. Plug-in products and devices such as the
DAQPad-1200, which connects to your computer parallel port, are all
examples of DAQ devices. SCXI modules are distinct from devices, with
the exception of the SCXI-1200, which is a hybrid.
DGND
digital ground signal
DIO
digital input and output
dB
20 log
10
×
V
1
V
2
⁄
(
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=