What does a multimeter reading of "OL" indicate when checking a diode?

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A multimeter reading of "OL" signifies an open circuit condition when checking a diode. This reading indicates that there is no conductivity through the diode in the forward direction, meaning the diode is not allowing current to pass. In the context of diodes, a properly functioning diode should show a low resistance when forward-biased and a high resistance or "OL" when reverse-biased. If the diode is indeed open, it suggests a failure, as diodes are designed to conduct current in one direction and block it in the other. Thus, when a multimeter displays "OL" while testing a diode, it confirms that the diode is not functioning as intended due to an open circuit condition.