A multimeter is a relatively precise instrument, and if used improperly, it not only causes inaccurate measurements but is also prone to damage. However, as long as we master the usage methods and precautions of a multimeter, and act with caution, then a multimeter can be durable and long-lasting. When using a multimeter, the following precautions should be taken:
(1) The measurement of current and voltage should not be rotated to the wrong gear. If the resistance or current range is mistakenly used to measure voltage, it is easy to burn out the meter. When the multimeter is not in use, rotate the gear to the AC voltage gear to avoid damage due to improper use.
(2) When measuring DC voltage and DC current, pay attention to the "+" and "-" characteristics and do not connect them incorrectly. If the pointer is found to be turned on or off, the meter rod should be replaced immediately to avoid damaging the pointer and meter head.
(3) If you do not know the magnitude of the measured voltage or current, you should first use a gear, and then choose a suitable gear for testing to avoid excessive deviation of the meter needle and damage to the meter head. The closer the selected gear is to the measured value, the more accurate the measured value will be.
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4) When measuring resistance, do not touch the two ends of the component (or the metal parts of the two gauge rods) with your hands to avoid parallel connection between the human body resistance and the measured resistance, which may result in inaccurate measurement results.
(5) When measuring resistance, if two meter rods are short circuited and the "zero ohm" knob is adjusted, the pointer still cannot reach the zero point. This phenomenon is usually caused by insufficient battery voltage in the meter, and a new battery should be replaced to accurately measure.
(6) When the multimeter is not in use, do not rotate it in the resistance range, as there is a battery inside. If not careful, it can easily cause two meter rods to collide and short circuit, which not only consumes the battery, but may even damage the meter head in severe cases.
