Glossary
©
National Instruments Corporation
G-15
SC-2311 User Manual
T
T/H
track-and-hold—a circuit that tracks an analog voltage and holds the value
on command
TC
(1) terminal count—the highest value of a counter (2) thermocouple
TCR
temperature coefficient of resistance
thermistor
a semiconductor sensor that exhibits a repeatable change in electrical
resistance as a function of temperature. Most thermistors exhibit a negative
temperature coefficient.
thermocouple
a temperature sensor created by joining two dissimilar metals. The junction
produces a small voltage as a function of the temperature.
transducer
See
sensor
transducer excitation
a type of signal conditioning that uses external voltages and currents to
excite the circuitry of a signal conditioning system into measuring physical
phenomena
TRIG
trigger signal
trigger
any event that causes or starts some form of data capture
TTL
transistor-transistor logic
U
unipolar
a signal range that is always positive (for example, 0 to +10 V)
update
the output equivalent of a scan. One or more analog or digital output
samples. Typically, the number of output samples in an update is equal to
the number of channels in the output group. For example, one pulse from
the update clock produces one update which sends one new sample to every
analog output channel in the group.
UPDATE
update signal
update rate
the number of output updates per second
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