How to judge the pt100 resistance

So-called good or bad is primarily a short circuit, open circuit judge, that is, a thermal resistance in use is due to mechanical vibration or temperature baking, wiring reason causes thermal resistance wire short circuit, break line, the multimeter can be detected with normal.

again and check the thermal resistance of the resistance value and temperature is linear and accurate, and the relation between the separable rough judgment and accurate calibration, rough judgment is mainly used for field failure judgment and screening, and through the multimeter to measure resistance value and then compared with measured temperature estimates see whether the gap is bigger, take thermal resistance after natural cooling in the measurement of electrical resistance to see if want to correspond with the ambient temperature, if requires accurate judgment, need to get the calibration chamber calibration measurement is made to the 0 degrees and 100 degrees to view the error meets the accuracy requirement.

judge PT100 thermal resistance are mainly low break, short circuit, and insulation, performance degradation, bolt and short circuit is better check, use multimeter test can solve, good or bad by megohmmeter telemetry insulation inspection, performance not only for the calibration, is the use of thermal resistance test system for heat resistance test, to see if qualified, unqualified proof performance, can't normal use.