Multimeter Precautions and Maintenance Tips
Multimeter is a relatively precise instrument, if not used properly, not only cause inaccurate measurement and very easy to damage. However, as long as we master the use of multimeters and precautions, be careful, then the multimeter can be durable. The use of multimeter should pay attention to the following matters:
-Measurement of current and voltage can not be rotated in the wrong gear. If the wrong resistance or current gear to measure the voltage, it is very easy to burn the meter. When the multimeter is not in use, it is best to rotate the gear to the highest level of AC voltage to avoid damage due to improper use.
-When measuring DC voltage and DC current, pay attention to "+" "-" polarity, do not connect the wrong. If you find that the pointer is reversed, you should immediately replace the meter stick to avoid damage to the pointer and the meter head.
-If you don't know the size of the measured voltage or current, you should use the highest grade first, and then choose a suitable grade to test, so as to avoid excessive deflection of the 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.
-When measuring the resistance, do not touch the bare ends of the components (or the metal parts of the two bars) with your hands, so as to avoid the parallel connection of the human body resistance and the measured resistance, which will make the measurement result inaccurate.
-When measuring resistance, if the two bars are shorted and the "zero ohm" knob is adjusted to the maximum, the pointer still can not reach the 0 point, this phenomenon is usually caused by the insufficient voltage of the battery inside the meter, which should be replaced by a new battery to measure accurately.
When the multimeter is not in use, don't rotate it in the resistance gear, because there is a battery inside, if you are not careful, it is easy to short-circuit the two rods, which will not only consume the battery, but also damage the head of the meter in serious cases.
