How to test a zener diode: practical schematic (max. 50 Volt)

How to test zener diodes in practice + schematic & demo. Important: vary the voltage when testing. Say: 25 V for 2-18 V zeners, 40 V for 18 V-32 V zeners etc. By the way: with the 10 K resistor nothing can go wrong when testing on 50 Volt, current is too small.

Due to the fact that I had only one hand to push the “zener under test” on the board/the flat copper electrodes, the demo was (perhaps) not so succesfull as I had wanted.

But, anyway, the circuit works very properly + the schematic is universal and very usable, and I have given the right resistor values to test all kinds of zener diodes, rated under 50 Volt and all relevant info, especially about the possible temperature sensitivity, the use of a digital voltmeter for serious tests e.g on temperature, etc.

You can test zeners up to 45 Volt with a power supply of 50 Volt with this schematic, given the resistors & their wattage values in the schematic + demo.

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Be aware of that, I saw on the internet my circuits reproduced in a poor or even not proper way. I can not help that, sorry. Update 14 June 2019.