Which of the following can damage a multimeter?

• A. Using it to measure low frequency signals
• B. Attempting to measure resistance with voltage applied
• C. Checking high current with a low setting
• D. Measuring capacitance incorrectly

Answer: (B)

Using a multimeter to measure resistance while voltage is applied can lead to significant damage. When a multimeter is set to measure resistance, it generates a small test voltage to pass through the resistor being measured. If there is an external voltage present, it creates a direct conflict. The internal circuitry designed to measure resistance may experience excessive current or voltage that it cannot handle, potentially frying components or causing permanent damage.

This scenario highlights the importance of knowing the proper settings and conditions under which to use a multimeter safely. Other choices illustrate different misuse scenarios but do not have the same level of risk for damage to the multimeter as trying to measure resistance with voltage applied.