After OM confirmed it, they found the location of the burn mark. It seemed that the burn mark was caused by the measurement of the 370A curve tracer, and then the arcing effect occurred.
After OM confirmation, the location of the burn marks was found, indicating that it was caused by the measurement of the 370A curve tracer, and then a flashover effect occurred.
After OM confirmed, the location of the burn mark was found, which seems to be caused by the measurement of 370A curve tracer, and then the arcing effect occurred.