Glossary
©
National Instruments
G-15
X Series User Manual
T
task
In NI-DAQmx, a collection of one or more channels, timing, and triggering
and other properties that apply to the task itself. Concept
u
ally, a task
represents a meas
u
rement or generation yo
u
want to perform.
TC
See
terminal co
u
nt.
terminal
An object or region on a node thro
u
gh which data passes.
terminal co
u
nt
The highest val
u
e of a co
u
nter.
t
gh
Gate hold time.
t
gs
u
Gate set
u
p time.
t
gw
Gate p
u
lse width.
timebase
The reference signals for controlling the basic acc
u
racy of time or
freq
u
ency-based meas
u
rements. For instr
u
ments, timebase refers to the
acc
u
racy of the internal clock.
t
o
u
t
O
u
tp
u
t delay time.
transd
u
cer
A device that responds to a physical stim
u
l
u
s (heat, light, so
u
nd, press
u
re,
motion, flow, and so on), and prod
u
ces a corresponding electrical signal.
See also
sensor
.
trigger
1. Any event that ca
u
ses or starts some form of data capt
u
re.
2. An external stim
u
l
u
s that initiates one or more instr
u
ment f
u
nctions.
Trigger stim
u
li incl
u
de a front panel b
u
tton, an external inp
u
t voltage
p
u
lse, or a b
u
s trigger command. The trigger may also be derived from
attrib
u
tes of the act
u
al signal to be acq
u
ired, s
u
ch as the level and slope
of the signal.
t
sc
So
u
rce clock period.
t
sp
So
u
rce p
u
lse width.
TTL
Transistor-Transistor Logic—A digital circ
u
it composed of bipolar
transistors wired in a certain manner. A typical medi
u
m-speed digital
technology. Nominal TTL logic levels are 0 and 5 V.
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