## Tuesday, October 17, 2023

Testing Zener Diodes with a Multimeter

How to test Zener diodes with a multimeter. What is the difference between a Zener diode and a standard diode? How to easily construct a test jig that tests Zener diodes up to 25V. Note that stacking 9V batteries can add up to significant voltages. I recommend wearing rubber gloves when working with any voltages above 20V.

How does the Zener Diode work?

The first thing to know is that the circuit symbol for zener diodes looks very similar to other diode symbols.

Make sure you don't get them confused because they behave very differently, and they are used to very different things! So what's special about zener diodes?

Regular diode VS Zener diode:

Step by step we will learn how it works and how Zener diode current passes in two directions?

Zener diodes work exactly like a standard diode, with the exception of one thing.

When the zener is on in the forward direction, we say it is "forward biased".

The diode won't even turn on and allow current to flow unless you have at least 0.7 volt with silicon diode and 0.3 volt with germanium diode.

But going the other way, In reverse bias.

Since current is flowing backwards, we say the Zener diode is "reverse biased". This property of having a predictable voltage drop is what makes Zener diodes useful.

Three Ways to Measure Zener Diode Voltage

This simple circuit shows you how to measure the Zener diode.

•The easiest way to measure the Zener voltage as shown by connecting 1K Ohm in series with the Zener diode.

•The battery or power supply must be larger than the voltage rating of the diode.

I have used 30 volts as a power supply to the circuit.

The second circuit i used a 30V transformer as a power supply.

the third circuit i used (3.7 Li-Ion battery + charger + DC-DC boost converter) as a power supply

Step by Step How to Make a Device Measuring Zener Diode Voltage:

With photos and videos you can understand the steps of how to make a device measuring Zener diode voltage

Testing Zener Diodes with a Multimeter

How to test Zener diodes with a multimeter. What is the difference between a Zener diode and a standard diode? How to easily construct a test jig that tests Zener diodes up to 25V. Note that stacking 9V batteries can add up to significant voltages. I recommend wearing rubber gloves when working with any voltages above 20V.

How does the Zener Diode work?

The first thing to know is that the circuit symbol for zener diodes looks very similar to other diode symbols.

Make sure you don't get them confused because they behave very differently, and they are used to very different things! So what's special about zener diodes?

Regular diode VS Zener diode:

Step by step we will learn how it works and how Zener diode current passes in two directions?

Zener diodes work exactly like a standard diode, with the exception of one thing.

When the zener is on in the forward direction, we say it is "forward biased".

The diode won't even turn on and allow current to flow unless you have at least 0.7 volt with silicon diode and 0.3 volt with germanium diode.

But going the other way, In reverse bias.

Since current is flowing backwards, we say the Zener diode is "reverse biased". This property of having a predictable voltage drop is what makes Zener diodes useful.

Three Ways to Measure Zener Diode Voltage

This simple circuit shows you how to measure the Zener diode.

•The easiest way to measure the Zener voltage as shown by connecting 1K Ohm in series with the Zener diode.

•The battery or power supply must be larger than the voltage rating of the diode.

I have used 30 volts as a power supply to the circuit.

The second circuit i used a 30V transformer as a power supply.

the third circuit i used (3.7 Li-Ion battery + charger + DC-DC boost converter) as a power supply

Step by Step How to Make a Device Measuring Zener Diode Voltage:

With photos and videos you can understand the steps of how to make a device measuring Zener diode voltage