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The required PIV rating could be resolved by initially substituting a test diode with a high voltage rating, and scoping later. This left only the unknown junction capacitance, Cj, and reverse ...
To measure a zener diode’s breakdown voltage, you need a dc voltage source whose voltage exceeds that of the zener voltage. In Figure 1, resistor R SER provides voltage drop between V IN and V ZEN .
In forward mode, approximately 150 µA flows through the diode, causing D4 to be reverse-biased and holding comparator U1’s inverting input low. This turns off the red LED.