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C

Celsius

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 channels 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