What parameters can most temperature sensors be tested for in an A/C system?

Temperature sensors in an A/C system, such as thermistors or thermocouples, primarily rely on the principle of resistance change with temperature. These sensors typically exhibit a change in resistance that correlates with temperature variations. Testing for resistance allows technicians to determine if the sensor is functioning within its specified range.

Additionally, the measurement of voltage drop can confirm the sensor's operation within the circuit, as it will produce a specific voltage output based on the resistance change at a given temperature. A voltage drop test can help determine if the sensor is accurately translating temperature changes into electrical signals.

The combination of testing resistance and voltage drop provides a comprehensive assessment of the sensor's performance, ensuring that it accurately monitors the A/C system's temperature conditions.