Multimeter operating procedures and precautions for use
1. Before use, you should be familiar with the various functions of the multimeter, and correctly select the gear, range and test lead socket according to the object being measured.
2. When the size of the measured data is unknown, you should first set the range switch to the maximum value, and then switch from the large range to the small range, so that the meter pointer indicates more than 1/2 of the full scale.
3. When measuring resistance, after selecting the appropriate magnification level, touch the two test leads to make the pointer point at the zero position. If the pointer deviates from the zero position, adjust the "zero adjustment" knob to return the pointer to zero to ensure accurate measurement results. . If it cannot be zeroed or the digital display issues a low-voltage alarm, it should be checked in time.
4. When measuring the resistance of a certain circuit, the power supply of the circuit under test must be cut off, and the measurement must not be carried out while it is powered on.
5. When using a multimeter for measurement, pay attention to the safety of the person and the instrument equipment. During the test, you are not allowed to touch the metal part of the test pen with your hands, and it is not allowed to switch the gear switch while the power is on to ensure accurate measurement and avoid accidents such as electric shock and burning of the meter. . [1]
Note on usage
1. Before using the multimeter, you should perform "mechanical zero adjustment", that is, when there is no electric quantity being measured, the multimeter pointer should point at the zero voltage or zero current position.
2. When using the multimeter, do not touch the metal part of the test lead with your hands. This can ensure accurate measurement on the one hand, and personal safety on the other hand.
3. When measuring a certain amount of electricity, you cannot change gears while measuring, especially when measuring high voltage or large current, you should pay more attention. Otherwise, the multimeter will be damaged. If you need to change gears, you should disconnect the test leads first, and then measure after changing gears.
4. When using the multimeter, it must be placed horizontally to avoid errors. At the same time, attention should also be paid to avoiding the influence of external magnetic fields on the multimeter.
5. After using the multimeter, the transfer switch should be set to the maximum AC voltage range. If it is not used for a long time, the battery inside the multimeter should also be taken out to prevent the battery from corroding other components in the meter.
