After the multimeter is used, the change-over switch should be placed at (the highest AC voltage or neutral). After the multimeter is used, it is the safest for the multimeter to place the change-over switch at the highest AC voltage or neutral gear. The internal resistance of the multimeter at the highest AC voltage or neutral gear is very large. When encountering large voltage or current, the multimeter head and circuit will not be burned because the change-over switch of the multimeter stops at an inappropriate position.
The main purpose of multimeter is to measure voltage, current and resistance. The multimeter is divided into pointer multimeter and digital multimeter according to the display mode. The multimeter can be used not only to measure the resistance of the object to be measured, but also to measure the DC voltage. Even some multimeters can measure the main parameters of transistors and the capacitance of capacitors. Common multimeter includes pointer multimeter and digital multimeter. Pointer type multimeter is a multi-function measuring instrument with a meter head as the core component. The measured value is indicated and read by the pointer of the meter head. The measured value of the digital multimeter is directly displayed in digital form by the LCD, which is convenient to read. A multimeter is an instrument that uses a common meter head and integrates a voltmeter, an ammeter and an ohmmeter. The DC current range of the multimeter is a multi range DC voltmeter. The voltage range can be expanded by paralleling the meter head with a closed circuit divider. The DC voltage range of the multimeter is a multi range DC voltmeter. The voltage range of the meter can be expanded by connecting the divider in series. The measuring range varies with the voltage divider. The head of the multimeter is a magnetoelectric measuring mechanism, which can only change AC to DC through DC and diode, thus realizing AC measurement. After the multimeter is used, set the change-over switch to the maximum AC voltage. If it is not used for a long time, take out the battery inside the multimeter to prevent the battery from corroding other components in the multimeter.
