The use of digital multimeter, the use of digital multimeter principle
Understand the test instrument friends may know: general ordinary multimeter is mainly used to measure the test resistance, voltage, current, there are multimeters can also be used to measure frequency, transistor, temperature and other conventional parameters.
Test the understanding of voltage measurement
Measurement of voltage can be divided into test DC voltage and test AC voltage, while test and measurement of current is divided into test and measurement of DC current and test and measurement of AC current. First of all, when you test the power supply voltage must be careful, measure the voltage first of all you have to make a judgement is what you test is the AC voltage or DC voltage, here I want to let you know a common sense, civilian are AC, however, mobile phones and other chargers and other various chargers output are DC voltage, in this way, when the test is a bit of a problem, so the measurements must be clear whether it is AC or DC before So before you measure, you must distinguish between AC and DC, and if you don't know whether the voltage is actually voltage or current when you measure, then you should put it into AC gear in case a lot of problems occur during the test. At this time you should be from the largest gear to the smallest gear slowly debugging conversion, until you need the value, just started using these measuring instruments, the accuracy level is not very important, the key question you have to remember, the key is to see whether the gear selection is correct and the multimeter table jack is consistent, if you measure the voltage is not careful, will be inserted into the current of the pen jack, then you are finished, because improper testing will result in the current gear, the current is the same. Because improper testing will cause the current gear must burn. There is a test finished multimeter, to develop a good habit, each time after using the multimeter must be converted to AC voltage gear * big gear, the table pen to be inserted into the voltage jack, this very good habit is best to be developed, on the future of the work habits are also a good help, otherwise. is to pay the tuition fee.
