Do you know what are the instructions for using the multimeter?
The following takes the MF30 multimeter as an example to illustrate the readings of the multimeter. The first scale line is the indication of the resistance value, the left end is infinity, the right end is zero, and the middle scale is uneven. The resistance files include R×1, R×10, R×100, R×1K, R×10K, respectively explaining the multiples to be multiplied by the indication of the scale to get the actual resistance value (in ohms).
For example, use R×100 to measure a resistance, and the pointer indicates “10”, then its resistance value is 10×100=1000, which is 1K. The second scale line is shared by the 500V range and the 500mA range. It should be noted that the indication principle of the voltage range and the current range is different from that of the resistance range. For example, the 5V range means that the range can only measure voltages below 5V, and the 500mA range can only measure 500mA. If the current below exceeds the range, the multimeter will be damaged.
Note: The multimeter should be placed horizontally when in use. Insert the red test lead into the + hole, and insert the black test lead into the - hole. Use the current gear to test the current, instead of using the voltage gear or electric barrier by mistake, and the other is the same, otherwise, the fuse in the multimeter will be burnt, and the meter head will be damaged if it is serious. If you don’t know the range in advance, choose the maximum range to try to measure, then disconnect the measurement circuit and then change gears. Never change the range while online. If the hands of the watch deflect to the end rapidly, the circuit should be disconnected immediately for inspection.
Finally, there is another rule, that is, after the multimeter is used up, the range switch should be set to the highest level of AC voltage, so as to prevent others from accidentally measuring the 220V mains voltage and damage it.
