Multimeter is a common electronic testing instrument, which is mainly used to measure voltage, current, resistance, capacitance and other values. It has the advantages of portability, high precision and convenient use, and is widely used in families, schools, factories and other fields. The following are the relevant details and knowledge expansion.

1. Composition of multimeter

The multimeter includes a meter head and a test line. Usually, the meter head consists of dial, knob, range selection switch, variable resistor and eyepiece, and the test line includes plug, probe and wire. Different types of multimeters can also add other functions, such as temperature test, frequency test and storage.

2. Measuring method of multimeter

According to the principle of circuit electricity, the multimeter feeds back electrical signals to the dial by contacting components or circuit nodes, thus obtaining corresponding values (voltage, current, resistance and capacitance). When using multimeter, it is necessary to select the appropriate range according to the specific scene and insert the test line into the component or circuit node. Generally, in order to obtain accurate test results, it is necessary to maintain good contact and stable state between the probe and the components.

3. Matters needing attention in the use of multimeter

When using multimeter, you need to pay attention to some basic safety measures, such as correct wiring and contact components, avoiding winding, ensuring that the circuit is disconnected, and not carrying metal ornaments. In addition, it is necessary to follow the relevant precautions and taboos in the instruction manual, such as not to use in high temperature, humidity or vibration environment, and not to expose the multimeter to the sun.

4. Maintenance and maintenance of multimeter

In order to ensure that the multimeter always keeps accurate and reliable test results, it needs regular maintenance. For example, check and replace failed or aging test wires and connectors, and clean dials and knobs to avoid impact and vibration. In addition, it is recommended to put the multimeter in a dry and ventilated place when it is not used for a long time to keep the meter head and test line clean and dry.

5. Types and uses of commonly used multimeters

According to different requirements and demands, multimeter can be divided into analog type and digital type. Generally speaking, digital multimeter has higher precision and wider range than analog multimeter. Different multimeters also have some different uses, such as analog is more suitable for testing AC signals than digital, and digital is more suitable for testing steady-state and pulse signals.

6. Other application fields of multimeter

Multimeters are not only widely used in families, schools and factories, but also in electronic production, education and research. For example, DIY enthusiasts can use a multimeter to test and adjust electronic components; Teachers can make students deeply understand the concepts of current and resistance by combining different measuring circuits. Scientific researchers can also use multimeters for some technical research.