What will the LCD display if a DMM is set for 200 V and the voltage to be measured is 277 volts?

When a digital multimeter (DMM) is set to measure a specific range, such as 200 V, it can only accurately display values that fall within that set range. If a voltage of 277 volts is applied, which exceeds the 200 V limit of the DMM's current setting, the instrument will simply not be able to measure this voltage accurately.

In this case, "OL" stands for "overload" or "over range." This indicates that the voltage being measured exceeds the maximum limit of the selected measurement range on the DMM. The display of "OL" is a protective measure that informs the user that the voltage is too high for the current setting, thus preventing any potential damage to the DMM and alerting the user to adjust the range accordingly to safely measure the voltage.

Adjusting the DMM to a higher range that can accommodate 277 V would be the appropriate next step for accurate measurement.