Lesson 1.3 Multimeter (PDF)

I. Introduction to Multimeters A. Definition of Multimeter II. A multimeter is a magneto-electric instrument with a rectifier that can measure a variety of electrical parameters such as AC and DC current, voltage and resistance. For each electrical quantity, there are generally se...

I. Introduction to Multimeters A. Definition of Multimeter II. A multimeter is a magneto-electric instrument with a rectifier that can measure a variety of electrical parameters such as AC and DC current, voltage and resistance. For each electrical quantity, there are generally several ranges. Also known as a multi-meter or simply multi-meter. A multimeter consists of a magneto-electric ammeter (meter head), a measurement circuit, and a selector switch. By changing the selector switch, a variety of electrical parameters can be easily measured. The main basis for circuit calculation is the closed circuit Ohm's law. There are many types of multimeters, which should be selected according to different requirements. General multimeter can measure DC current, DC voltage, AC voltage and resistance. Some multimeters can also measure capacitance, inductance, power, transistor co-emitter DC amplification factor hFE. B. Typical uses of multimeters There are many typical uses of multimeters in electronics and electrical engineering, including: 1. measuring voltage: this is the most basic function of a multimeter and can be used to measure the voltage of a battery or power supply. 2. Measuring current: A multimeter can be used to measure the current in a circuit to determine if the device is working properly. 3. Measurement of resistance: Multimeters can be used to measure the resistance of resistors or to check the connectivity of wires and switches. 4. Capacitance measurement: Some advanced multimeters can measure the capacitance of capacitors. 5. Fault detection: Multimeters can be used to check circuits for shorts or breaks. 6. Diode and transistor testing: Some multimeters have special settings to test these electronic components. 7. Temperature measurement: Some advanced multimeters are equipped with thermocouples that can be used to measure temperature.  8. Frequency measurements: Some multimeters can measure the frequency of an AC power source. Overall, multimeters are very useful tools that can help engineers and technicians make all types of electrical and electronic measurements.