Basic Measuring Functions of a Digital Multimeter
A multimeter can not only be used to measure the resistance of the object being measured, but also to measure AC and DC voltages. Even some multimeters can measure the main parameters of transistors and the capacitance of capacitors. Fully mastering the usage of a multimeter is one of the most fundamental skills in electronic technology. Common multimeters include pointer multimeters and digital multimeters. A pointer type multimeter is a multifunctional measuring instrument with the meter head as the core component, and the measured values are read by the pointer on the meter head. The measured values of a digital multimeter are directly displayed in digital form on the LCD screen, making it easy to read. Some even have voice prompts. A multimeter is an instrument that uses a common meter head and integrates a voltmeter, ammeter, and ohmmeter.
The DC current range of a multimeter is a multi range DC voltmeter. The parallel connection of a closed circuit voltage divider resistor in the meter head can expand its voltage range. The DC voltage range of a multimeter is a multi range DC voltmeter. Connecting a voltage divider resistor in series with the meter head can expand its voltage range. The corresponding range varies depending on the voltage divider resistor. The head of a multimeter is a magneto electric measuring mechanism, which can only measure AC power by converting AC power to DC power through diodes.
Precautions for using a multimeter
1. Before using a multimeter, it is necessary to perform a "mechanical zeroing", which means that when there is no measured power, the multimeter pointer should be placed at the zero voltage or zero current position.
2. During the use of a multimeter, do not touch the metal part of the probe with your hands. This ensures accurate measurement and personal safety.
3. When measuring a certain amount of electricity, it is not advisable to shift gears at the same time, especially when measuring high voltage or high current. Otherwise, it will damage the multimeter. If you need to shift gears, disconnect the probe first and then measure after shifting gears.
4. When using a multimeter, it must be placed horizontally to avoid errors. At the same time, it is also important to avoid the influence of external magnetic fields on the multimeter.
5. After using the multimeter, the conversion switch should be set to the maximum AC voltage setting. If not used for a long time, the battery inside the multimeter should be removed to prevent corrosion of other components inside the meter.
