All You Need to Know About Relays
What Is a Relay? A relay is a switch that opens or closes a circuit when it receives an electrical control signal. The control side and the load side are usually separate, which makes the relay us...
How to Test a Voltage Regulator with a Multimeter
To test a voltage regulator with a multimeter, first check what kind of regulator you are working with. On a car, the test is usually done at the battery: measure voltage with the engine off, then ...
ETL Listed is a product safety certification mark showing that a product has been independently tested by Intertek and certified to meet applicable safety standards. For anyone working with or a...
How to Test a GFCI Breaker With a Multimeter
Summary: A multimeter can help verify whether a GFCI breaker cuts power when its TEST button is pressed, but it cannot fully certify the breaker’s trip current or response time. For a safe homeowne...
How to Test Speaker Output With Multimeter
A typical passive speaker system includes three important parts: The amplifier or receiver sends an audio signal through its speaker output. The speaker wire carries that signal to the speaker. Th...
How to Choose a Multimeter: A Buying Guide
Choosing a multimeter can take time when there are so many models, functions and price points to compare. Without a clear idea of what you need, it is easy to pay for features you may never use or ...
CAT Ratings on Multimeters: What CAT II, CAT III and CAT IV Mean
When shopping for a multimeter, you may see ratings such as CAT II, CAT III or CAT IV listed in the product specifications. You may also come across safety guides or tutorials that tell you to chec...
Multimeter Symbols Explained: The Ultimate Beginner's Guide
For many beginners, the hardest part of using a multimeter is not taking the measurement itself — it is understanding all the symbols on the meter. The dial, buttons, display, and input ports can l...
How to Use a Multimeter: Multimeter 101 Guide for Beginners
Start Here Editor’s Note Learning how to use a multimeter can feel confusing at first. After reviewing common questions from multimeter users, our team found that many beginners want to under...