Before testing the resistance of a hot surface ignitor with a digital multimeter, what should a technician do?

Before testing the resistance of a hot surface ignitor with a digital multimeter, it is important for a technician to allow the igniter to cool to room temperature. This is crucial because measuring resistance on a hot component can lead to inaccurate readings. When an ignitor is heated, its resistance changes due to the temperature-dependent nature of its materials. For accurate measurements that reflect the actual operational state of the component, a cool ignitor provides a stable and consistent baseline for resistance testing. Additionally, performing tests on a hot ignitor can pose safety risks and potential damage to the multimeter or the component itself. Therefore, allowing the ignitor to cool ensures both accuracy and safety during the testing process.