How do you test 4 wire PT100 temperature sensor RDT?

To test a 4-wire PT100 temperature sensor (RTD), first, ensure that the sensor is connected correctly to a suitable measurement device, such as a resistance meter or a precision ohmmeter. Measure the resistance across the two middle leads, which are connected to the RTD element; a typical PT100 sensor should show a resistance of approximately 100 ohms at 0°C. If the resistance deviates significantly from the expected value, the sensor may be faulty. Additionally, you can compare the measured resistance at different temperatures to verify its linearity and accuracy.