1. After the product is assembled on-line by the customer, during the testing process, there is an overvoltage or overcurrent state, and the product instantaneously
breakdown, resulting in an electrical increase or no resistance (generally, Burnt marks on the surface of the product);

2. The product suffers from stress damage after the client is assembled online, and the positive electrode of the resistor is peeled off, which affects the electrical properties.
Good (in general, the measurement performance is infinite or no resistance value).