Cần chú ý điều gì khi sử dụng đồng hồ vạn năng

The use of desktop multimeters is less difficult, and the detailed usage is as follows. 1. Don't make mistakes with the test pen. If the jack is wrong, the signal will not be perceived and the accuracy of the judgment will be weakened. Or after measuring the voltage, when measuring the current, you need to adjust and replace the gear and jack in time, otherwise a short circuit will occur. Under normal circumstances, the fuse in the multimeter is blown, and a series of other hardware or circuit damage cannot occur. Even so, we must pay great attention to it, use the correct test pen, and adjust the gear and socket in time. . 2. When measuring resistance, remember not to measure with electricity, this is a taboo. Because not only will the measurement result be inaccurate, but the multimeter will also be damaged. 3. When measuring current, be sure to connect it in series in the loop, and when measuring resistance or voltage, be sure to connect it in parallel in the loop. The above 2 points must be kept in mind and not sloppy. 4. At full scale, the meter only displays the number "1" in the highest digit, and no other digits are displayed. It is the best choice when using a higher range. 5. When the instrument is tested, it is necessary to avoid rotating the function changeover switch, especially when the high voltage and high current are used, the range cannot be changed with electricity. (Above 220V) or large current (above 0.5A) when changing the range, if not, arcing will occur, and the switch contacts will also be burned. 6. Do not change the circuit at will, and pay attention to the following points: ① Do not connect to a DC voltage higher than 1000V or a voltage higher than 700V AC RMS. ②Do not connect the voltage source when the function switch is in the ω and position. ③ Please do not use this watch when the battery is not installed or the back cover is not tightened. ④The battery or fuse can be replaced only after the test lead is removed and the power is cut off.