Patent ID: 7392147

Claim:
A Universal Serial Bus (USB) port tester for testing a USB port of an electronic device, the USB port tester comprising: an interface unit configured for electrically connecting the USB port of the electronic device to a USB device, the interface unit comprising a first USB port for electrically connecting with the USB port of the electronic device, and a second USB port for electrically connecting with the USB device, terminals of the first USB port respectively electrically coupled to the corresponding terminals of the second USB port; a current-testing unit connected to the interface unit for testing quality of the USB port of the electronic device in a standard current range, the current-testing unit comprising an ampere meter and a variable resistor, the ampere meter and the variable resistor connected between a power terminal and a ground terminal of the first USB port in series; and a voltage-testing unit connected to the interface unit for testing quality of the USB port of the electronic device in a standard voltage range.