I don't have a sophisticated equipment to do all these types of measurements.I used a digital multimeter for measurements. What I did was I disconnected the old sensor and measured the resistance values between two terminals and compared those readings with the new sensor. Even if I reversed the leads of the meter the results are still the same. I don't have a schematic diagram and the theory and operation of the sensor so I cannot tell what really the function of each component and how they behave in the circuit.