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Letter - C
Calibration procedure

A procedure that is performed to determine and set the parameters affecting an instrument’s performance in order to ensure its designed function within prescribed limits.

Carnot cycle

An ideal heat engine that converts thermal energy to mechanical work with the greatest efficiency that can be achieved.

Celsius or C

The temperature scale in which the temperature in Celsius (TC) is related to the temperature in Kelvin (TK) by the formula; TC = TK -273.15. The freezing point of water at standard atmospheric pressure is very nearly 0 °C, and the corresponding boiling point is very nearly 100 °C. Formerly known as centigrade temperature scale.

Color temperature

The temperature of a black body from which the radiant energy has the same spectral distribution as that from a surface.

Colored body or non gray body

A source of thermal emission for which the emissivity depends on wavelength and is not constant.

Comparison pyrometry

Method of radiation thermometry wherein the temperature of a calibrated source is changed until the radiation received from the source is the same as that from the target to determine the temperature of the target.


A form of communications wherein a pair of wires is used to transmit the signal as a current. Levels of 4 to 20 mA are often used to indicate the minimum and maximum signal level, respectively. Sometimes, for digital applications, various magnitudes of mA current are used to indicate a logical 1 and 0. The current loop is often characterized by a maximum impedance of the device that is connected to the loop.

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