Glossary
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National Instruments Corporation
G-11
T
TC
terminal count—the highest value of a counter
t
gh
gate hold time
t
gsu
gate setup time
t
gw
gate pulse width
THD
total harmonic distortion—the ratio of the total rms signal due to harmonic
distortion to the overall rms signal, in decibel or a percentage
thermocouple
a temperature sensor created by joining two dissimilar metals. The junction
produces a small voltage as a function of the temperature.
TIO
timing input/output
t
out
output delay time
TRIG
trigger signal
trigger
any event that causes or starts some form of data capture
t
sc
source clock period
t
sp
source pulse width
TTL
transistor-transistor logic
two’s complement
given a number
x
expressed in base 2 with
n
digits to the left of the radix
point, the (base 2) number 2
n
–
x
U
UI
update interval
UISOURCE
update interval counter clock signal
unipolar
a signal range that is always positive (for example, 0 to +10 V)