National Instruments DAQ X Series User Manual page 270

Glossary
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.
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 the ability of a differential
amplifier to reject interference from a common-mode signal, usually
expressed in decibels (dB).
common-mode The ability of an electronic system to cancel any electronic noise pick-up
rejection that is common to both the positive and negative polarities of the input leads
to the instrument front end. Common mode rejection is only a relevant
specification for systems having a balanced or differential input.
common-mode signal 1. Any voltage present at the instrumentation amplifier inputs with
2. The signal, relative to the instrument chassis or computer's ground, of
connector 1. A device that provides electrical connection.
2. A fixture (either male or female) attached to a cable or chassis for
convert rate Reciprocal of the interchannel delay.
count The number of events, such as zero crossings, pulses, or cycles.
counter 1. Software. A memory location used to store a count of certain
2. Hardware. A circuit that counts events. When it refers to an instrument,
counter/timer A circuit that counts external pulses or clock pulses (timing).
X Series User Manual
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respect to amplifier ground.
the signals from a differential input. This is often a noise signal, such
as 50 or 60 Hz hum.
quickly making and breaking one or more circuits. A symbol that
connects points on a flowchart.
occurrences.
it refers to a frequency counter.
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