Here is a handy zener diode tester which tests zener diodes with a Digital Multimeter with breakdown voltages extending up to 120 volts.

The voltage in Figure 4was measured at a zener-diode current of 2.8 mA. Figure 4 Measure the voltage across a zener diode with a digital multimeter. You can use the circuits in figures 2 and 3 to test ...

The circuit presented here is compact and handy for measuring the voltage rating of a Zener diode instantly. To check a Zener diode, it is connected across a DC power supply with a suitable resistor ...

The 1N4004 diode rectifies the unloaded voltage while the 2.2 uF capacitor flattens it to reach the rate of 150 VDC. 1N4004 provides high forward surge current capability, guaranteed high temperature ...

What’s avalanche operation? Watch the end of the video and find out. This isn’t the first time we’ve talked about the lowly Zener. We’ve also talked about Zeners and Schottky diodes, too.

If you have a Zener diode (ZD) of unknown characteristics or if you want to use reverse-biased transistor junctions as ZD, the zener voltage and performance can be tested with this simple circuit.