Operating procedures and precautions for using a multimeter
Operating procedures
1. Before use, one should be familiar with the various functions of the multimeter, and correctly select the gear, range, and probe socket based on the measured object.
2. When the size of the measured data is unknown, the range switch should be set to the maximum value first, and then switched from a large range to a small range, so that the instrument pointer indicates more than half of the full scale.
3. When measuring resistance, after selecting the appropriate magnification range, touch the two probes to make the pointer point at the zero position. If the pointer deviates from the zero position, the "zero adjustment" knob should be adjusted to reset the pointer to zero to ensure accurate measurement results. If zero adjustment is not possible or the digital display meter emits a low voltage alarm, it should be checked in a timely manner.
4. When measuring the resistance of a certain circuit, the power supply of the tested circuit must be cut off and live measurement is not allowed.
5. When using a multimeter for measurement, attention should be paid to the safety of personnel and instrument equipment. During the test, it is not allowed to touch the metal part of the probe with hands, and it is not allowed to switch gears with electricity to ensure accurate measurement and avoid accidents such as electric shock and burning of the instrument.
Precautions for use
1. Before using a multimeter, it is necessary to perform a "mechanical zero adjustment", which means that when there is no measured electricity, the multimeter pointer should be positioned at zero voltage or zero current.
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 simultaneously, especially when measuring high voltage or high current. Otherwise, it may cause damage to the multimeter. If you need to shift gears, you should first disconnect the probe and then take measurements after shifting gears.
4. When using a 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. If not in use for a long time, the battery inside the multimeter should also be removed to prevent the battery from corroding other components inside the meter.
