Precautions to avoid damage to the multimeter
1. In most cases, the damage of the digital multimeter is caused by the wrong measurement position. For example, when measuring the AC mains, the measurement position is selected to be placed in the electric block. In this case, once the test pen touches the mains, it will be caused instantly. The internal components of the multimeter are damaged. Therefore, before using the multimeter to measure, be sure to check whether the measurement gear is correct. After use, set the measurement option to AC 750V or DC 1000V, so that no matter what parameter is mismeasured in the next measurement, it will not cause damage to the digital multimeter.
2. Some digital multimeters are damaged because the measured voltage and current exceed the range. For example, if the mains is measured at the AC 20V gear, it is easy to cause damage to the AC amplifier circuit of the digital multimeter, and the multimeter loses the AC measurement function. When measuring DC voltage, if the measured voltage exceeds the measurement range, it is also easy to cause circuit failure in the meter. When measuring the current, if the actual current value exceeds the range, generally only the fuse in the multimeter will be blown, and no other damage will be caused. Therefore, when measuring voltage parameters, if you do not know the approximate range of the measured voltage, you should first set the measurement gear to the highest gear, and then change gears to measure after measuring its value to obtain more accurate values. If the voltage value to be measured is far beyond the maximum range that the multimeter can measure, it should be equipped with a high-resistance measuring probe.
3. The upper range of the DC voltage of most digital multimeters is 1000V, and the upper range of the AC voltage is 750V. Therefore, the highest measured voltage value is below the upper range of the multimeter, and generally the multimeter will not be damaged. If the upper range of the multimeter is exceeded, it is likely to cause damage to the multimeter.
4. Do not measure voltage in the current file, resistance file, diode file and buzzer file. When the meter is being tested, the function switch cannot be rotated, especially when the voltage is high and the current is high.
5. If you use a multimeter to check the quality of the components or measure the resistance of the components in the circuit, the circuit is not allowed to be charged, because the multimeter uses the internal battery of the multimeter to work. If the circuit is charged, it is easy to damage the internal battery of the multimeter. It will affect the accuracy of the measurement. If the multimeter is blocked by insurance, it is easy to damage the equivalent resistance of the electric block.
6. When the battery symbol appears on the screen, it means that the battery is low and the battery should be replaced. After each measurement, the meter should be turned off. Regardless of use or storage, moisture and water are strictly prohibited.
