The thermal resistance is prone to inaccurate measurement in some cases. Here are some situations that can lead to inaccurate thermal resistance measurements:

1. Temperature probe aging: The sensitive elements of thermal resistors are usually made of metals or alloys, and these materials may age over time. Aging can lead to changes in resistance values, which can affect the accuracy of temperature measurements.

2. Physical damage: The sensitive part of the thermal resistance is usually a fragile ceramic material that is susceptible to physical damage, such as vibration, shock or pressure, which can cause the thermal resistance performance to decline.

3. Contamination and corrosion: The sensitive elements of the thermal resistance may be contaminated by chemical corrosion or sediment, which will change the resistance value and affect the accuracy of the temperature measurement.

4. Incorrect connection: Correct cable connection is essential for accurate measurement of thermal resistance. Incorrect wiring or loose connections can lead to inaccurate resistance values, which can lead to temperature measurement errors.

5. Temperature gradient: If the thermal resistance does not operate in a uniform temperature environment, the temperature gradient may lead to inaccurate temperature measurement. This is particularly important in high or low temperature applications.

6. Impedance mismatch: The resistance value of the thermal resistance may not match the input impedance of the measuring device, which will lead to measurement errors. It is usually necessary to use the appropriate contactor or amplifier to solve this problem.

7. Long cables: When thermal resistance is used on long distance cables, the cable resistance may have an impact on the measurement results. This requires compensation in the measurement or the use of special cables.

8. Environmental impact: humidity, radiation, vibration and other environmental factors may also have a negative impact on the performance of the thermal resistance, resulting in inaccurate measurement.

In order to ensure that thermal resistors provide accurate temperature measurements, regular calibration, maintenance and inspection are necessary. In addition, the manufacturer's recommendations should be followed and appropriate precautions should be taken to reduce the impact of the above issues on measurement accuracy.