When measuring a diode with an ohmmeter, what does a reading of .6 Ω with the positive lead on the anode indicate?

A reading of .6 Ω on a diode with the positive lead on the anode typically indicates that the diode is functioning correctly and conducting in the forward direction. In a properly working diode, when forward-biased, a low resistance reading—often in the range of a few ohms—suggests that the diode is allowing current to pass through, which is its intended operation.

In practical terms, an ohmmeter sends a small current through the diode when it is in forward bias (anode positive, cathode negative). A low resistance measurement signifies that the diode is not open (which would result in an infinite resistance reading) and is also not shorted (which would yield a reading of zero ohms). Instead, the .6 Ω reading suggests the diode is not only intact, but also has acceptable conduction properties under these test conditions. This confirms that the diode is good and capable of performing its function in a circuit.