Which method would indicate a properly functioning diode during a multimeter test?

A properly functioning diode during a multimeter test is characterized by a specific reading when the multimeter is set to the diode test mode. An "OL" (open loop) reading typically indicates that the diode is reverse-biased or not conducting electrical current in the reverse direction, which is expected behavior for a functioning diode. In these cases, the multimeter is unable to measure any current, reflecting that the diode is not allowing current flow in that direction.

When testing a diode, a good diode should show a low voltage drop (typically between 0.6V and 0.7V for silicon diodes) when forward-biased, while an "OL" reading is what you would observe when the diode is reverse-biased. This reading signifies that the diode is operating correctly by allowing current to flow in one direction while blocking it in the opposite direction, which is fundamental to its functionality.

Other readings, such as "1.00" or "0.00," do not indicate proper diode function. A steady voltage reading would suggest that the diode is not behaving as intended under those conditions, as it does not conform to the expected behavior of blocking or conducting based on the biasing conditions. Hence, "OL" serves as the indicator