2
PREPARATION FOR USE
Overview
2-32 TP04300 Series Interface & Applications Manual
Section J:
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Interfacing and Attaching Thermocouples
Overview
In general, there are two functional modes available in which to operate the TP04300. Both
modes allow test setup and test running.
The two functional modes are:
Air mode: which uses the main airstream temperature as primary control
DUT mode: an external temperature sensor (thermocouple or RTD) interfaced directly to the
DUT monitors DUT temperature and permits DUT tuning. In DUT mode, primary control can
be 1) use main air temperature, above, or 2) use the DUT temperature monitored by the
external sensor.
A thermocouple and/or RTD sensor can be defined as follows:
Thermocouple: a temperature measurement sensor which consists of two dissimilar metals
joined together at one end (a junction) which produces a small thermoelectric voltage when the
junction is heated. The change in thermoelectric voltage is interpreted by thermocouple
thermometers as a change in temperature.
Resistance Temperature Detector (RTD) sensors operate on the principle of change in
electrical resistance in wire as a function of temperature. An RTD probe is an assembly
composed of an element (the actual temperature sensing unit), a sheath, lead wire(s), and a
termination or connection.
For purposes of this manual, the term “thermocouple” may apply to RTD sensors as well.
In this Section
Topic See Page
Sensor Interface Guidelines 33
T-Type Sensors 35
K-Type Sensors 38
RTD-Type Sensors 39
Diode-Type Sensors 40
Non-Standard Thermocouples 41
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