When using a DMM to verify a grounding system, the measurement mode is set to __________.

Using a Digital Multimeter (DMM) to verify a grounding system involves assessing the resistance of the ground connection. When the measurement mode is set to resistance, it allows you to determine how effectively the grounding system is functioning. A low resistance reading indicates a good ground connection, meaning that electricity can flow safely to the earth. This is essential for preventing electrical shock hazards and ensuring that protective devices like circuit breakers operate correctly during faults.

The other modes of measurement, such as voltage and current, are not suitable for evaluating grounding systems. Voltage measurement would assess the potential difference, while current measurement would indicate how much current flows, neither of which directly provides information on the integrity of the ground connection itself. The diode setting is used primarily for testing diodes and is not applicable in this context. Thus, selecting the resistance mode is critical for evaluating the effectiveness of the grounding system.