is determined that the power supply status of the usb port of the test apparatus is normal conversely if the buzzer is in a status of no buzz it is determined that the power supply status of the usb port of the test apparatus is abnormal and therefore the likelihood that the buzzer might have burnt out or that power supply is not up to par and thus prevents the buzzer from functioning well referring to fig4 there is shown a flow chart of a method for examining a usb port of a test apparatus according to an embodiment of the present invention the examination method illustrated with fig4 is performed on a usb port of a test apparatus with a view to examining the power supply status of the usb port using the examination device shown fig2 in the embodiment illustrated with fig4 the alerting unit 105 is a light emitting diode led step s 1 connecting a usb connector of an examination device to a usb port of a test apparatus wherein the usb port functions as an interface for use in an ensuing test performed by the test apparatus on an electronic product equipped with a usb interface step s 2 determining whether a power supply status of the usb port of the test apparatus is normal according to whether light emission from a light emitting diode led is normal wherein normal light emission from the led leads to the determination that the power supply status of the usb port of the test apparatus is normal and abnormal light emission such as emitting no light or flashing from the led leads to.