The instrument described here lets you check that zener diodes up to 200 V are working correctly, and it lets you find out the reverse breakdown voltage of an unknown zener diode (note that zener diodes are only called zeners from 2 V to 5.6 V — those above 5.6 V ought strictly speaking to be referred to as ‘avalanche diodes’, as the avalanche effect then becomes predominant).
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