Zener Diode Voltage Test

Nearly 6 months into my electronics hobby, still loving it. There is so much to learn sometimes I think my poor old brain, lol. Anyway’s, after playing with some Zener diodes I got them mixed up and then got confused about which were which. I have to put them back in the right baggies so I found a method of figuring the forward voltage. I hope to demonstrate my simple understanding. Can this old dog learn a few new tricks?

CSI3005X III FIX pt1

As a keen novice hobbyist I like to get stuck in and see what’s what.
After discovering my CSI3005X or QJE rebranded PSU had a fault I informed the sellers, CircuitSpecialists.eu
They are quite helpful and now the PSU is being taken apart with CS.eu’s approval. They sent me a photo to inspect the capacitor I told them (after looking at its schematic) I thought was shorting.