National Instruments NI 4350, User Manual

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Glossary
© National Instruments Corporation G-3 NI 4350 User Manual
C
C Celsius
channel pin or wire to which you apply or from which you read the analog or
digital signal. For digital signals, you group channels to form ports.
Ports usually consist or either four or eight digital channels.
CHx channel signal
clock hardware component that controls timing for reading from or writing to
groups
CMOS complimentary metal oxide semiconductor
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 boards plugged into a
computer, and possibly generating control signals with D/A and/or DIO
boards in the same computer
dB decibel—the unit for expressing a logarithmic measure of the ratio of
two signal levels: dB=20 x log
10
(V
1
/V
2
) for signals in volts
DC direct current
DC coupled allowing the transmission of both AC and DC signals
device a plug-in data acquisition board, card, or instrument that can contain
multiple channels and conversion devices. Plug-in boards, PCMCIA
cards, and instruments such as the NI 4350 (USB), which connects to
your computer USB port, are all examples of DAQ devices.
DGND digital ground signal
DIO digital input and output