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Glossary
G-8
ni.com
system noise
a measure of the amount of noise seen by an analog circuit or an ADC when
the analog inputs are grounded
T
thermistor
a semiconductor sensor that produces a repeatable change in electrical
resistance as a function of temperature. Most thermistors have a negative
temperature coefficient (NTC).
thermocouple
a temperature sensor created by joining two dissimilar metals. The junction
produces a small voltage as a function of the temperature.
TTL
transistor-transistor logic
U
update
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.
update rate
the rate at which the measurement data is updated
USB
Universal Serial Bus
V
V
the basic unit of electromotive force, or electric “pressure” that causes
electric current to flow. One volt is defined as the electromotive force to
make one ampere current flow through a one ohm resistor.
VI
virtual instrument—(1) a combination of hardware and/or software
elements, typically used with a PC, that has the functionality of a classic
standalone instrument; (2) a LabVIEW software module (VI), which
consists of a front panel user interface and a block diagram program
VirtualBench-Logger
a high-performance, easy-to-use, virtual instruments application program
for use with the NI 435
x
devices
virtual channels
channel names that can be defined outside the application and used without
having to perform scaling operations