Glossary
© National Instruments Corporation G-3 NI PCI-6110/6111 User Manual
C
CCelsius
CalDAC calibration DAC
CH channel—pin or wire lead to which you apply or from which you read
the analog or digital signal. Analog signals can be single-ended or
differential. For digital signals, you group c hannels to form ports. Ports
usually consist of either four or eight digital channels.
channel rate reciprocal of the interchannel delay
cm centimeter
CMOS complementary metal-oxide semiconductor
CMRR common-mode rejection ratio—a measure of an instrument’s ability to
reject interference from a common-mode signal, usually expressed in
decibels (dB)
common-mode noise unwanted signals that appear in equal phase and amplitude on both the
inverting and noninverting input in a differential measurement system.
Ideally, but not completely in practice, the measurement device ignores
this noise, because the measurement device is designed to respond to
the difference between the inverting and noninverting inputs.
common-mode range the input range over which a circuit can handle a common-mode signal
common-mode signal the mathematical average voltage, relative to the ground of the
computer, of the signals from a differential input
common-mode voltage any voltage present at both instrumentation amplifier inputs with
respect to amplifier ground
CONVERT* convert signal
counter/timer a circuit that counts external pulses or clock pulses (timing)
CTR counter