When inserting test leads into a DMM for DC voltage measurements, the red lead should go into which port?

The correct choice for inserting the red lead when measuring DC voltage with a digital multimeter (DMM) is into the V Hz port. This is because the V Hz port is specifically designed for voltage measurements, including both AC and DC voltages.

When conducting DC voltage measurements, the red lead is usually connected to this port, while the black lead is typically inserted into the COM (common) port, which serves as the reference point for the measurement. The V Hz port allows the multimeter to accurately measure voltage levels, ensuring proper functionality and preventing damage to the instrument that might occur if the leads are inserted into the wrong ports.

In contrast, the COM port is not suitable for voltage measurements; it’s meant for common connections. The AMP port is designated for current measurements, while the Ω port is used for resistance measurements. Therefore, using the correct port optimizes the performance of the DMM and ensures safety during testing.