How does a MULTIMETER work? Learn to use a MULTIMETER!
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- Опубликовано: 7 сен 2024
- Multimeters are valuable tools for troubleshooting a wide range of electrical components. The possible applications are many, but they are usually used for testing:
wall sockets
power cables
home appliances
consumer electronics
vehicle electrical systems
What is a multimeter?
A multimeter is a measuring device used to measure various electrical values. Multimeters can measure voltage, current, resistance and (sometimes) test for continuity.
The multimeter's impressive versatility is due to its ability to test all three basic units of electricity, including:
Voltage: Multimeters can test two forms of voltage: alternating current (AC) and direct current (DC). AC is the voltage used in your home's electrical wiring, while DC is primarily used in vehicles, residential solar systems, and consumer electronics. Voltage is measured in volts.
Resistance: Resistance is the opposition to the flow of current through a circuit and is measured in Ohms.
Current: Generally speaking, current is the amount of electricity that flows through the circuit and is measured in amps. The amount of amps flowing through a circuit is the difference between the applied voltage and the resistance present. Milliamperes (1/1000 of an amp) are the most common unit of amps measured with a multimeter.
In addition to testing these three functions, some multimeters test for continuity or the absence of resistance within a circuit. Not all multimeters have dedicated continuity functions, but those that emit an audible beep when continuity is present. If this setting is not present, resistance testing can be used.
Finally, there are two different types of multimeters: analog and digital. The main difference between the two is their display. Analog multimeters display their measurements with a needle that moves over a progressive scale. Digital multimeters have an LCD screen that displays measurements in four or five digits. Another difference is that analog multimeters generally do not offer a continuity function, although some do.
Parts of a Multimeter
Display: The window where electrical measurements are displayed.
Selection button: A round dial that allows you to select the type of electrical unit to be measured. You can switch between AC volts (V with a wavy line on either side or above), DC volts (DC-) and resistance (Ω), amps (A) and milliamps (mA). Continuity is marked with the diode symbol (triangle with a line on the right side) and/or a sound wave symbol on the selection button.
Probes: Red and black wires used to physically test the electrical component. Each is equipped with a pointed metal tip on one end and a banana plug on the other. The metal tip is used to probe the component being tested and the banana plug connects to one of the multimeter's ports. While there is no real difference between the two probes, the black wire is often used to test ground and neutral (or common) terminals, and the red wire is generally used for hot terminals. When testing resistance and continuity, it makes no difference which probe is used where.
Ports: Most multimeters are equipped with three ports: COM (or “-”), mAVΩ, and 10A. COM stands for common and is where the black probe is usually connected. The mAVΩ port is where the red probe connects to measure volts, resistance and current. The 10A port is a special port that is used to measure currents greater than 200 mA. Some multimeters have four ports that split the functions of the mAVΩ setting into two, with a VΩ setting for volts and resistance and a µAmA setting for current.
security considerations
When using a multimeter to test live electricity, it is important to take certain safety precautions to avoid any chance of electrocution, as accidents can occur.1 This includes:
wear insulating gloves
Do not use a multimeter with broken or frayed leads on the test leads
Do not perform any electrical tests in wet conditions
Do not touch the probe tips together during the test
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eu tenho um multimetro no estilo desse intermediario que voce mostrou porem sempre me confundo na polaridade dos fios e como fazer a mediçao de corrente agora eu aprendi.
O melhor vídeo que já vi de multímetro
Multímetro é muito útil. Gostei da sua explicação
Muito bom! Tenho um multímetro simples aqui, uso muito as funções de corrente contínua, alternada, continuidade e resistência, gosto de fuçar e consertar as coisas aqui em casa kkkk
Conteúdo mto útil, adorei entender melhor sobre o assunto 👏👏👏
Sensacional. Adquirir mais informações... obrigado
Boa noite meu amigo
Ótima aula
Quero aprender para testar peças de carro e outros coisas
Um abraço
Mestre seus vídeos são ótimos parabéns
Comprei um desse pretinho p 20 reais ... muito util
Show de bola 👏👏👏👍👍
Sou quase um especialista depois que uma de nossas plotters deu defeito. O pessoal da manutenção cobrava o olho da cara só para testar as placas. Resultado? Fiz um intensivão que deu resultados positivos....rs
Excelente. Essa mentalidade de resolver problemas é crucial e certamente traz benefícios.
Tenho certeza que esse conhecimento ninguém tira mais.
Bem legal.
Estou querendo aprender a usá-lo os multimetros
Show
A intenção foi boa.
Muito bom
Existe diferença na qualidade da leitura entre os multímetros analógicos dos digitais ? Ou a diferença está somente na leitura da informação ?
Duuuuude you show dangerous stuff this time . Is the channel moving towards Electro Boom like content? 😜
Not really. We don't like to get electrocuted on purpose hahaha
Onde nunca devo colocar um multimetro? (queimar ele ou até ferir quem esta utilizando)
Excelente pergunta tbm é minha dúvida 😅