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Glossary
AT-MIO-16X User Manual G-24
©
National Instruments Corporation
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.
throughput rate the data, measured in bytes/s, for a given continuous operation,
calculated to include software overhead. Throughput Rate = Transfer
Rate Software Overhead Factor.
top-level VI VI at the top of the VI hierarchy. This term is used to distinguish the VI
from its subVIs.
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
transfer rate the rate, measured in bytes/s, at which data is moved from source to
destination after software initialization and set up operations; the
maximum rate at which the hardware can operate
trigger any event that causes or starts some form of data capture
TTL transistor-transistor logic
U
UART universal asynchronous receiver/transmitter—an integrated circuit that
converts parallel data to serial data (and vice versa), commonly used as
a computer bus to serial device interface for serial communication
UI update interval
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.