Glossary
G-8
ni.com
sense
in four-wire resistance the sense measures the voltage across the resistor
being excited by the excitation current
settling time
the amount of time required for a voltage to reach its final value within
specified limits
source impedance
a parameter of signal sources that reflects current-driving ability of voltage
sources (lower is better) and the voltage-driving ability of current sources
(higher is better)
system noise
a measure of the amount of noise seen by an analog circuit or an ADC when
the analog inputs are grounded
T
temperature
coefficient
the percentage that a measurement will vary according to temperature.
See also
thermal drift.
thermal drift
measurements that change as the temperature varies
thermal EMFs
thermal electromotive forces—voltages generated at the junctions of
dissimilar metals that are functions of temperature. Also called
thermoelectric potentials.
thermoelectric
potentials
See
thermal EMFs.
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
U
undersampling
sampling at a rate lower than the Nyquist frequency—can cause aliasing
update rate
the number of output updates per second
