How to test the function of mobile phone data line? A multimeter to get
Aug 02, 2018| I believe that every mobile phone data line factory will have a quality department. Naturally, there will be multimeters. In general, the red line in the data cable of the mobile phone is the positive pole of the power supply, and the black line is the negative pole of the power supply. However, it is unscientific and insecure to determine the role of each line in a mobile phone data line based solely on color. The most secure method is to use a multimeter to measure. The USB data line is composed of at least four lines, that is, the positive power line, the negative power line, and the data transmission is positive and negative data transmission. So distinguish these function lines, a multimeter easily get!
The following are the measurement steps for measuring the data cable of a multimeter:
1, first screw the multimeter knob to the resistance file.
2. Touch the black test pen to the metal part of the head of the data line of the mobile phone, and the red pen touches each gold finger or pin of the data line of the mobile phone.
3, the resistance value is zero, it can be judged that the power line is negative.
4. Insert the data cable into the device's USB port.
5. Turn the multimeter knob to DC voltage.
6. The black pen contact only determines the negative power line. The red pen table touches other data pins, and the voltage can be identified as the positive of the power line.
After reading this article, you should know how to test the phone data line function!