A technician needs to test a household appliance heating element for continuity and resistance using a digital multimeter. What is the correct chronological sequence of steps to perform this measurement safely and accurately?
- 1Disconnect the appliance from the electrical power supply to ensure the circuit is fully de-energized.
- 2Disconnect at least one electrical lead from the heating element terminals.
- 3Insert the black test lead into the COM jack, the red lead into the jack, and turn the selector dial to the resistance () setting.
- 4Touch the two multimeter probe tips together to verify that the meter displays near and the test leads have continuity.
- 5Place the probe tips firmly across the heating element terminals and observe the resistance reading on the digital display.
Answer
The correct chronological sequence is: first disconnect the appliance power supply, second disconnect at least one wire lead to isolate the heating element, third insert the test leads and set the multimeter dial to resistance, fourth touch probe tips together to verify meter zeroing and lead continuity, and fifth place the probe tips across the heating element terminals to read the resistance value.
The correct sequence follows standard electronics testing protocol: power must always be disconnected first for safety, the component must be isolated to prevent parallel loop paths from skewing readings, the meter must be properly set up, test leads must be shorted to verify zero calibration, and finally the probes are applied to measure the isolated component.
Step-by-Step Solution
Key Concept
Safe and accurate multimeter resistance and continuity measurements require complete circuit de-energization, component isolation, proper lead/meter configuration, calibration verification, and direct terminal contact.
Estimated Time:1m 15s