TCR
Temperature Coefficient of Resistance. TCR tells how much the resistance of a resistor
changes as the temperature of the resistor changes. The unit of TCR is ppm/°C (parts-per-
million per degree Celsius). A positive TCR means that resistance increases as temperature
increases. For example, a resistor with a specification of 10 ppm/°C will not increase in
resistance by more than 0.000010 Ω per ohm over a 1 °C increase of the resistor temperature
or by more than .00010 Ω per ohm over a 10 °C increase.
Telnet
A software utility that attempts to contact and interrogate another specific device in a
network. Telnet is resident in Windows OS.
terminal
Point at which a wire (or wires) connects to a wiring panel or connector. Wires are usually
secured in terminals by screw- or lever-and-spring actuated gates with small screw- or
spring-loaded clamps.
terminal emulator
A command-line shell that facilitates the issuance of low-level commands to a data logger or
some other compatible device. A terminal emulator is available in most data logger support
software available from Campbell Scientific.
thermistor
A thermistor is a temperature measurement device with a resistive element that changes in
resistance with temperature. The change is wide, stable, and well characterized. The output
of a thermistor is usually non-linear, so measurement requires linearization by means of a
Steinhart-Hart or polynomial equation. CRBasic instructions Therm107(), Therm108(), and
Therm109() use Steinhart-Hart equations.
thing
A thing resource is a digital representation of a physical device or logical entity in AWS IoT.
Appendix C. Glossary291
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