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Glossary
SCXI-1127/1128 User Manual G-2 ni.com
C
CCelsius
channel pin or wire lead on the multiplexer to which you apply or from which you
read the analog or digital signal. Signals can be single-ended or differential.
CJS cold junction sensor
cold-junction
compensation
a method of compensating for inaccuracies in thermocouple circuits
contact bounce the intermittent switching that occurs when the movable metal parts of a
relay make or break contact
D
DC direct current
debounced indicates when the contact bounce has ended. See contact bounce.
device a plug-in board, card, or pad that can contain multiple channels and
conversion devices. Some examples of devices are computers,
multimeters, multiplexers, oscillators, operator interfaces, and
counters.
digital multimeter a multifunction meter used to make measurements such as voltage, current,
resistance frequency, temperature, and so on
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.
DMM See digital multimeter.
drivers/driver software software that controls a specific hardware device such as a switch card
E
external trigger a voltage pulse from an external source that triggers an event such as
A/D conversion