Transmitter
(Two-Wire)
1. A device which
is used to transmit data from a sensor via a twowire current loop. The
loop has an external power supply and the transmitter acts as a variable
resistor with respect to its input signal.
2. A device which translates the low level output of a sensor or transducer
to a higher level signal suitable for transmission to a site where it
can be further processed.
Triac
A solid state switching device used to switch alternating current
wave forms.
Triboelectric
Noise
The generation of electrical charges caused by layers of cable
insulation. This is especially troublesome in high impedance accelerometers.
Triple
Point (Water)
The thermodynamic state where all three phases, solid, liquid,
and gas may all be present in equilibrium. The triple point of water
is .01°C.
Triple
Point
The temperature and pressure at which solid, liquid, and gas phases
of a given substance are all present simultaneously in varying amounts.
True
RMS
The true root-mean-square value of an AC or AC-plus-DC signal,
often used to determine power of a signal. For a perfect sine wave,
the RMS value is 1.11072 times the rectified average value, which is
utilized for low-cost metering. For significantly non-sinusoidal signals,
a true RMS converter is required.
TTL
Unit Load
A load with TTL voltage levels, which will draw 40 µA for
a logic 1 and -1.6 mA for a logic 0.
TTL-Compatible
For digital input circuits, a logic 1 is obtained for inputs of
2.0 to 5.5 V which can source 40 µA, and a logic 0 is obtained
for inputs of 0 to 0.8 V which can sink 1.6 mA. For digital output signals,
a logic 1 is represented by 2.4 to 5.5 V with a current source capability
of at least 400 µA; and a logic 0 is represented by 0 to 0.6 V
with a current sink capability of at least 16 mA.
TTL
Transistor-to-transistor logic. A form of solid state logic which
uses only
transistors to form the logic gates.
Turbulent
Flow
When forces due to inertia are more significant than forces due
to viscosity.
cont....
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