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National Instruments Corporation
G-5
Glossary
CPC
bidirectional lines for Port A of PPIC
CPU
central processing unit
crosstalk
an unwanted signal on one channel due to an input on a different channel
CTR1
counter 1 enable bit
CTRIRQ
counter interrupt enable bit
current drive capability
the amount of current a digital or analog output channel is capable of
sourcing or sinking while still operating within voltage range specifications
current sinking
the ability of a DAQ board to dissipate current for analog or digital output
signals
current sourcing
the ability of a DAQ board to supply current for analog or digital output
signals
D
DAC
digital-to-analog converter—an electronic device, often an integrated
circuit, that converts a digital number into a corresponding analog voltage
or current
daisy-chain
a method of propagating signals along a bus, in which the devices are
prioritized on the basis of their position on the bus
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
DATA
data lines at the specified port signal
DC
direct current
DC coupled
allowing the transmission of both AC and DC signals
