A list of typical errors associated with the use of temperature sensors is provided in 8.8.Random errors in temperature measurement are a result of resolution limits of measuring and recording equipment, time variations in extraneous variables,and other sources of variation. Thermocouples have some characteristics that can lead systematic and random errors, such as effect of extension wires and connectors. Anothor major source of for thermocouples involves the accuracy of thereference junction. Ground loop can lend to spurious readings, especially when thermocouple outputs are amplified for control or data-acquisitious readings, especially when thermocouple outputs are amplified for control or data-acquisition purposes. As with any measurement system, calibration of the entire measurement system, in place if possible, is the best means of identifying error sources and reducing the resuling measurement uncertainty to accrptaber limits.