PPE

How to systematically learn how to use a multimeter?

The multimeter is just a tool, just like a screwdriver. It is not the purpose to use the multimeter well. Our purpose is to use the multimeter to measure the data we need, then do an analysis, and finally find the cause of the problem.
Do not use a multimeter to use a multimeter.
So, if you want to use a multimeter well, what you need is to learn the basics of electronics, voltage, current, resistance, Ohm’s law, circuit basics, capacitance, inductance, and characteristics…
Xiaobian’s suggestions It is
that you want to learn systematically. This is a certain degree of difficulty. You need to know the general structure and principles inside. This still requires several courses.
If you don’t want to be so systematic, you can learn some precautions and some common sense. In most cases, it is enough. You can also go to the Internet to watch the video.

Here are some unique skills used by the multimeter
1. Before using the multimeter, you should perform “mechanical zero adjustment”;
2. In order to improve the measurement accuracy, try to use the multimeter when measuring The pointer is in the middle position. The range should be appropriate, and the needle should be more than half way off. Select the range. If the measured size cannot be estimated in advance, choose a larger range as much as possible, and then gradually change to a smaller range according to the deflection angle until the pointer deflects to about 2/3 of the full scale;
3 , When using a multimeter to test components with positive and negative polarity such as transistors and electrolytic capacitors, pay attention to the polarity relationship. The black negative must be clearly remembered, and the black “+” is connected in the table. The red test lead is the positive electrode and the black test lead is the negative electrode, but the black test lead is connected to the positive electrode of the internal battery;
4. If the multimeter needs to change gears, disconnect the test leads first, and then measure after shifting. The measurement is not shifted, and the neutral shift is completed after the measurement. During the measurement, the selector knob cannot be arbitrarily moved, especially when measuring high voltage (such as 220V) or large current (such as 0.5A), so as to avoid arcing and burn out the contacts of the transfer switch. After the measurement is completed, the range selection switch should be set to the “?” position;
5. After the multimeter is used, the switch should be set to the maximum range of AC voltage;
6. If the multimeter is not used for a long time, the internal battery of the multimeter should be Take it out to prevent the battery from corroding other devices in the meter;

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