Measurement Precautions for Pointer Multimeter
Multimeter is a relatively precise instrument, if not used properly, not only cause inaccurate measurement and 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:
(1) Measurement of current and voltage can not rotate the wrong gear. If you mistakenly resistive block or current block to measure the voltage, it is easy to burn the meter. When the multimeter is not in use, rotate the block to the AC voltage block to avoid damage due to improper use.
(2) When measuring DC voltage and DC current, pay attention to the "+" "-" nature, do not connect the wrong. If you find the pointer on the reverse, both should be immediately switched to the meter stick, so as not to damage the pointer and the head.
(3) If you do not know the size of the measured voltage or current, you should first use the block, and then select the appropriate gear to test.
To avoid excessive deflection of the needle and damage to the meter head, the closer the selected gear is to the measured voltage or current, the better it will be. The closer the selected gear to the measured value, the more accurate the measured value.
(4) When measuring the resistance, do not touch the ends of the components (or the metal parts of the two rods) with your hands, so as to avoid parallel connection between the human body resistance and the measured resistance, which will make the measurement result inaccurate.
(5) Measurement of resistance, such as the two sticks shorted, adjust the "zero ohm" knob to, the pointer is still not up to 0, this phenomenon is usually caused by insufficient battery voltage inside the table, should be replaced with a new battery can be measured accurately.
(6) When the multimeter is not in use, do not rotate in the resistance gear, because there are batteries inside, such as accidentally easy to make the two rods touch the short circuit, not only consume batteries, and in serious cases, it will even damage the meter head.
