Standard installation on digital thermometers. There are many types of digital thermometers, and the span of accuracy is very large. Here we stipulate to use standard mercury thermometers, second-class standard platinum resistance thermometers, and second-class platinum-rhodium 10-platinum thermocouples as standard devices. Standard mercury thermometers are mainly used for calibration of thermometers with low accuracy, second-class standard platinum resistance thermometers are mainly used for calibration of high-accuracy thermometers, second-class platinum-rhodium 10-platinum thermocouples are used for calibration of high-temperature sections At the same time, it also stipulates that other standard devices with an accuracy level not lower than the above requirements can be used, and the measurement uncertainty requirements for the standard device and supporting electrical measuring equipment are not greater than 1/3 of the measurement uncertainty of the thermometer to be calibrated.
