Glossary
©
National Instruments Corporation
G-3
SCB-68 Shielded Connector Block User Manual
cm
centimeter
cold-junction
compensation
CJC—an artificial reference level that compensates for ambient
temperature variations in thermocouple measurement circuits
CompactPCI
refers to the core specification defined by the PCI Industrial Computer
Manufacturer’s Group (PICMG)
CONVERT*
convert signal
counter/timer
a circuit that counts external pulses or clock pulses (timing)
CTR
counter
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
DAC0OUT
analog channel 0 output signal
DAC1OUT
analog channel 1 output signal
DAQ
data acquisition—a system that uses the computer to collect, receive, and
generate electrical signals
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
DIFF
differential mode
DIO
digital input/output
DMA
direct memory access—a method by which data can be transferred to/from
computer memory from/to a device or memory on the bus while the
processor does something else; DMA is the fastest method of transferring
data to/from computer memory
DoC
Declaration of Conformity
