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Glossary
PCI-4451/4452 User Manual G-4
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National Instruments Corporation
clip clipping occurs when an input signal exceeds the input range of the
amplifier
clock hardware component that controls timing for reading from or writing to
groups
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)
code width the smallest detectable change in an input voltage of a DAQ device
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 computer’s ground, of the
signals from a differential input
common-mode voltage any voltage present at the instrumentation amplifier inputs with respect to
amplifier ground
compensation range the range of a parameter for which compensating adjustment can be made
conditional retrieval a method of triggering in which you simulate an analog trigger using
software. Also called software triggering.
conversion device device that transforms a signal from one form to another. For example,
analog-to-digital converters (ADCs) for analog input, digital-to-analog
converters (DACs) for analog output, digital input or output ports, and
counter/timers are conversion devices.
conversion time the time required, in an analog input or output system, from the moment a
channel is interrogated (such as with a read instruction) to the moment that
accurate data is available
CONVERT* convert signal
counter/timer a circuit that counts external pulses or clock pulses (timing)
coupling the manner in which a signal is connected from one location to another
crosstalk an unwanted signal on one channel due to an input on a different channel
User.book Page 4 Tuesday, April 14, 1998 10:20 AM