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Here's my pictorial to add to Davenn's explanation. I just sorted out a bunch of zeners last week this way. Remember to label the diode if it's going into the parts bin.
Whaaa?! I simply have the resistor on the other side of the diode. It's still getting current limited. The measurement is still across the junction of the resistor and diode to the other side of the diode.
Tada!
What is a negative rail fault?its just very unorthodox thats all, in the case of a negative rail fault, your zener and assoc circuity would not be current or voltage protected. You should always have the limiting and regulation in the positive rail, showing otherwise could lead those less knowledgeable astray
Dave