How to Use a Multimeter
Hello, my friend, hello again; today we come together to talk about How to Use a Multimeter and hope the blog can help you.
No more scratching your head at malfunctioning appliances. With this guide, you’ll learn the ins and outs of troubleshooting your home and household electronics using one of your toolkit’s handiest instruments.
Once reserved for engineers and electronic technicians, multimeters—sometimes called “multitesters”—have come down in price and size, making them indispensable for homeowners who have basic knowledge of circuitry. When troubleshooting problems with small appliances, smart-home modules, speaker systems, or just about any other electronic item, a multimeter will be among the most valued tools in your arsenal.
If you’re new to multimeters, these gadgets may seem daunting at first. Learn the basics, however, and you’ll soon be able to perform a number of diagnostic tests on your own. Because multimeters vary from model to model, be sure to study your specific unit’s operating manual before you get started.
Types of Multimeters
Analog multimeters, or volt-ohm-milliammeters (VOM), have been around for decades and can still be found, affordably, at any do-it-yourself-type store. The new kids on the block—digital multimeters (DMM)—offer greater precision with decimal point readouts, even enhanced functions, such as the ability to auto-detect alternating current (AC) or direct current (DC).
Applications and Limitations
Both VOM and DMM models measure voltage, resistance, and current, replacing the need for individual voltmeters, ohmmeters, and ammeters. While you can test household voltage with a multimeter, electrical-current-testing is limited to low-voltage circuits, such as small direct current (DC) motors or low-voltage alternating current (AC) appliances—your thermostats and doorbells, for example. To avoid blowing a fuse, destroying the multimeter, or risking injury, do not attempt to test current higher than the maximum allowed for your unit.
Among other things, multimeters can determine:
- Available battery charge
- Voltage at an outlet or switch
- Damage in cables and cords
- Viability of fuses, diodes and resisters
- Conductive ability of an electrical pathway
“The first time I used a multimeter, I found the most challenging part was deciphering the hieroglyphic-like settings on the front of the unit, and decoding strange readings that would sometimes appear on the display. While there are certainly common attributes from multimeter to multimeter, not all communicate with you in the same way. For example, a multimeter may display either OL, 99999, or 1 if it’s overloaded, depending on the brand and model. Take the time to read through your multimeter’s instruction manual to get acquainted with its controls and display readings before you dive in and begin using it.” —Tony Carrick, Contributing Writer
Tried-and-True Advice