The multimeter is one of the most commonly used measuring instruments for electronic enthusiasts. It is an instrument that integrates many common electrical measurement functions. Nowadays, many multimeters are developing in the direction of intelligence. There are many types and functions of multimeters on the market. How to choose a multimeter suitable for you? How to use the multimeter? The multimeter knowledge you care about is described in detail below.
1. What is a multimeter?
Multimeters, also known as multiplex tables, multimeters, tri-meters, and multi-use meters, are indispensable measuring instruments for power electronics and other departments. Generally, voltage, current and resistance are the main purposes. The multimeter is divided into a pointer multimeter and a digital multimeter according to the display mode. It is a multi-functional, multi-range measuring instrument. The general multimeter can measure DC current, DC voltage, AC current, AC voltage, resistance and audio level, etc. Some can also measure AC current, capacitance, inductance and semiconductor. Some parameters.
2, the role of the multimeter
Basic functions: three basic test items of voltage, current and resistance
Expanding empty energy: measuring capacitance, inductance, frequency, duty cycle, temperature, triode amplification
3. Classification and principle of multimeterClassification of multimeters
Common multimeters have pointer multimeters and digital multimeters. The pointer multimeter is a multi-function measuring instrument with a head as the core component, and the measured value is read by the head pointer. The measured value of the digital multimeter is displayed directly by the liquid crystal display in digital form, which is convenient to read, and some also have a voice prompt function. The multimeter is a meter that shares a meter head, a voltmeter, an ammeter, and an ohmmeter.
Multimeter principle
The basic principle of the multimeter is to use a sensitive magneto-electric DC ammeter (micro-ampere meter) as the head. When a small current passes through the meter, there is a current indication. However, the meter head cannot pass a large current, so it is necessary to shunt or step down some resistors in series with the series head to measure the current, voltage and resistance in the circuit.
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