Incorrect IFOV and MFOV.
Fault was found on the grounding cable. The temperature was only 48°C. It was fortunate to have found this thermal anomaly; however, the distance-spot size ratio is much too small to measure correctly. The actual temperature is most likely at least double the indicate temperature. In fact it is almost too small to see. The temperature is far higher than the indication. It was recommended for future inspections to purchase and use a telephoto lens.