How to use a multimeter9/7/2023 ![]() Liquid Crystal Display – often with a backlight.Controls – a rotary selection switch and buttons.Ports – where the probes plug into the meter.Probes – insulated wires with pointed tips.This is a photograph of my original multimeter, bought in 1977. The lower cost and greater precision of the digital meters have made the analog versions obsolete. They may be analog (with a moving needle and several scales) or digital with a numeric LCD screen. This useful tool goes by several other names: multitester, or VOM (volt-ohm-milliammeter). A mirror behind the needle was included to aid accurate readings from the needle. ![]() It contained a moving coil meter, precision resistors with various sockets and switches to select the appropriate mode and range. It was later developed and sold as the AVOmeter – Amps-Volts-Ohms. This tutorial is aimed at beginners to electronics and will show you how to read voltage, current, resistance, and check for continuity.ĭonald Macadie, a British Post Office engineer, maintaining telecommunication equipment early in the 1920s, has been attributed with the invention of a single instrument that could measure amps, volts, and ohms. ![]() ![]() Why is that LED coming on dimly when that one lights up fully or why does that LED never light up? If it is a circuit problem you are probably going to need a multimeter to help track down the fault. It may be your code or it may be your circuit. Once you start designing your own projects, using either a breadboard or stripboard, the circuits get more complicated and you will probably find that you have made small errors and things do not always work as you expected, here is where you need to learn how to use a multimeter to help troubleshoot your project. ![]()
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