What is the purpose of setting a DMM range slightly higher than the expected voltage?

Setting a digital multimeter (DMM) range slightly higher than the expected voltage serves primarily to prevent overload and damage to the device. When measuring voltage, it is essential to select a range that can accommodate the expected input without exceeding the DMM's maximum voltage capacity.

If the selected range is too low and a higher voltage is applied, it can cause the internal components of the multimeter to become damaged due to excessive current flowing through them. By using a range that is slightly higher than anticipated, the user protects the DMM from potential overload conditions and ensures accurate readings without risking equipment failure.

Choosing a higher range also helps to maintain the integrity of the measurement process, providing safer operating conditions and reducing the chance of errors that could occur when using a range that is too low.