How to use a digital multimeter, the principle of using a digital multimeter
Friends who understand testing instruments may know that ordinary multimeters are mainly used to measure test resistance, voltage, current, and some multimeters can also be used to measure conventional parameters such as frequency, transistor, temperature, etc.
Understanding of Testing and Measuring Voltage
Voltage measurement can be divided into testing DC voltage and testing AC voltage, while current measurement can be divided into testing DC current and testing AC current. First of all, when testing the power supply voltage, you must be careful. When measuring the voltage, the first thing you need to do is to determine whether you are testing AC voltage or DC voltage. Here, I want to let everyone know a common sense that civilian products are all AC voltage, but mobile phone chargers and other chargers output DC voltage. This can be a bit troublesome during testing, so it is necessary to distinguish between AC and DC before measuring. If you do not know whether the voltage is actually voltage or current when measuring, you should put it in AC mode to prepare for many problems during testing. At this point, you should slowly adjust and transition from the maximum gear to the minimum gear until you reach the desired value. When using these measuring instruments at the beginning, the accuracy level is not very important. The key issue you need to remember is whether the gear selection is correct and whether the multimeter socket is consistent. If you accidentally insert the probe into the current socket when measuring voltage, then you are done, because improper testing can cause the current gear to burn out. When testing the multimeter, it is important to develop a good habit of shifting the gear to AC voltage mode * high mode after each use, and inserting the probe into the voltage socket. This good habit is also helpful for future work habits, otherwise you will have to pay tuition fees.
