What Core Functions Does a Digital Multimeter Offer?
A general digital multimeter can measure DC current, DC voltage, AC current, AC voltage, resistance, and audio frequency voltage levels. Some models can also measure AC current, capacitance, inductance, and some parameters of semiconductors. The basic principle is to use a sensitive magnetoelectric DC ammeter (microammeter) as the meter head. When a small current passes through the meter head, the multimeter will indicate the current.
A digital multimeter can not only measure the resistance and AC/DC voltage of the object being measured, but also measure DC voltage. Some multimeters can even measure the main parameters of transistors and the capacitance of capacitors. Fully mastering the use of a multimeter is one of the most basic skills in electronic technology. Common multimeters include analog multimeters and digital multimeters. An analog multimeter is a multifunctional measuring instrument with a meter head as its core component, and the measured value is indicated and read by the meter head pointer. The measured value of a digital multimeter is directly displayed in digital form on a liquid crystal display, making it easy to read, and some even have voice prompt functions. A multimeter shares a common meter head and integrates a voltmeter, ammeter, and ohmmeter into one instrument.
The DC current setting of a multimeter is a multi-range DC voltmeter. By connecting the meter head in parallel with a closed-circuit voltage divider resistor, its voltage range can be expanded. The DC voltage setting of a multimeter is also a multi-range DC voltmeter. By connecting the meter head in series with a voltage divider resistor, its voltage range can be expanded. Different voltage divider resistors correspond to different measurement ranges. The meter head of a multimeter is a magnetoelectric measuring mechanism, which can only pass DC current. It uses a diode to convert AC into DC, thus enabling the measurement of AC electricity.
