How to use a digital multimeter, how to use a digital multimeter
Understanding of testing and measuring voltage
Voltage measurement can be divided into testing DC voltage and testing AC voltage, while testing and measuring current can be divided into testing and measuring DC current and testing and measuring AC current. First of all, you must be careful when you test the power supply voltage. When measuring the voltage, you must first judge whether what you are testing is AC voltage or DC voltage. Here I want to let everyone know a common sense. Civilian products are all AC. However, chargers such as mobile phones and other chargers output DC voltage, which makes the test a bit troublesome. Therefore, you must distinguish whether it is AC or DC before measuring. If you measure If you don't know whether the voltage is actually voltage or current, then you should put it in the AC setting in case many problems occur during the test. At this time, you should slowly adjust and convert from the maximum gear to the minimum gear until you reach the value you need. When you first start using these measuring instruments, the accuracy level is not very important. You have to remember the key issues. The key It depends on whether the gear selection is correct and whether the multimeter jack is consistent. If you accidentally insert the test lead into the current jack when measuring the voltage, then you are screwed, because improper testing will cause the current gear to change. Must be burned. Also, when you finish testing the multimeter, you should develop a good habit. Every time you use the multimeter, you must switch the gear to the AC voltage range* and insert the test leads into the voltage jack. This is a good habit* It is good to develop it, and it will also be a good help for future work habits. Otherwise, you will have to pay tuition.
