Glossary
6527 User Manual G-2 www.ni.com
C
C Celsius
CAT I installation category (overvoltage category) I—equipment for which
measures are taken to limit transient overvoltages to an appropriate low
level. Examples include signal-level, telecommunications, and electronic
equipment with transient overvoltages smaller than local-level mains
supplies.
cm centimeters
CompactPCI refers to the core specification defined by the PCI Industrial Computer
Manufacturer’s Group (PICMG)
D
DAQ data acquisition—a system that uses the personal computer to collect,
measure, and generate electrical signals
DC direct current
DIG+ positive data terminal
DIG– negative data terminal
DIO digital input/output
DMA direct memory access—a method by which data can be transferred to or
from computer memory from or to a device or memory on the bus while the
processor does something else. DMA is the fastest method of transferring
data to or from computer memory.
G
GND ground reference
H
Hz hertz