Temperature sensor testing method, involves determining temperatures of temperature sensitive resistors and difference between temperatures, and issuing error signal when temperature difference exceeds given value

摘要

The method involves connecting temperature sensitive resistor (R1) with a low-impedance series resistor (Rshunt1) over a switching device (5) when another temperature sensitive resistor (R2) is connected with a high-impedance series resistor (R4) over another switching device (6). A voltage drop at the temperature sensitive resistors or its series resistors (Rshunt1, R4) is detected. Temperatures of the temperature sensitive resistors, and difference between the temperatures, are determined. An error signal is issued when the temperature difference exceeds a given value.