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Thanks again blakeyboy. Since you posted this, I recently got a bench supply with variable output, so I’d love to try this test as properly as possible, and learn the theory behind it.

Would you kindly share a bit more info about what I should send into the units for calibration? They’re completely passive at the moment, so I don’t know what amount of DC to apply to them to do this test.

And also, I think I understand what you mean now about the diodes - I believe you’re saying a negative voltage will read at a different level than a positive voltage if a diode is damaged.

If I wanted to repair these, how would I most safely open them and work on them? Is there a method you could suggest using to keep them clean, or simply just clean your area as much as possible?

Thanks as always,

MG