I believe that every do mobile phone cable factory have a quality department, that naturally, there is a multimeter. And usually a headphone cables inside the red line for the power of the anode, the black line for the power of the cathode. But completely based on color to determine the role of each line in the mobile phone data cable is not scientific and unsafe, the safest way is to use a multimeter to measure. USB cable is composed of four lines, at least, that is, is the power cord, the power cord anode, data transmission is positive, negative transfer of data. So to distinguish these function line, a multimeter easily done! The following is a multimeter to measure the headphone cables measurement steps: 1, the first multimeter knob screw to resistance. 2, black metal part of the test pen touch phone cable head, red pen touch touch phone cable respectively each gold finger or pin. 3, resistance to zero feet, can judge the power cord to the cathode. 4 to the USB port and insert the cable equipment. 5, multimeter knob screw to dc voltage. 6, black pen point is sure the power cord, red table respectively contact other data pins, voltage can be identified as the power cord to the anode. Saw this article, you should know how to test the headphone cables function!
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