6 things to note about multimeter
The multimeter is a relatively precise instrument. If it is not used properly, it will cause inaccurate measurement and is easily damaged. However, as long as we master the usage and precautions of the multimeter and proceed carefully, the multimeter will last for a long time. When using a multimeter, the following items should be paid attention to:
1. Measuring current and voltage cannot be rotated in the wrong gear. If you mistakenly use the resistance gear or the current gear to measure the voltage, it is very easy to burn out the ammeter. When the multimeter is not in use, it is best to turn the gear to the highest level of AC voltage to avoid damage due to improper use.
2. When measuring DC voltage and DC current, pay attention to the polarity of "+" and "-", and do not connect them wrongly. If the pointer is found to be reversed, the watch stick should be replaced immediately to avoid damage to the pointer and the watch head.
3. If you do not know the magnitude of the voltage or current to be measured, you should use the highest gear first, and then select a suitable gear for testing, so as to avoid damage to the meter due to excessive deflection of the hands. The closer the selected gear is to the measured value, the more accurate the measured value will be.
4. When measuring the resistance, do not touch the naked ends of the component (or the metal parts of the two watch rods) with your hands, so as to avoid the parallel connection of the human body resistance and the measured resistance, making the measurement result inaccurate.
5. When measuring resistance, if you short-circuit the two gauge sticks and adjust the "zero ohm" knob to the maximum, the pointer still does not reach 0. This phenomenon is usually caused by insufficient voltage of the battery in the gauge, and you should replace it with a new one. Batteries can be measured accurately.
6. When the multimeter is not in use, do not turn it on the resistance gear, because there is a battery inside. If you are not careful, the two meter sticks will collide and short-circuit, which will not only consume the battery, but even damage the meter head in severe cases.
