It can automatically detect the speed of target device (480Mbps/12Mbps/1.5Mbps) and display USB packets on the LCD at real time and record the data on the 100Mbyte capture memory at the same time. It can record not only USB packets, but also bus events such as resets and suspends with time stamp information. Dedicated branch circuit on the measuring board minimizes the effect to the target line. There are a log filter to capture specific events and a display filter to shorten the analysis time. Powerful trigger function makes it possible to have auto-stop function and to input/output the external signals to the other devices. VBUS measurement function records voltage, current, power consumption at min of 1ms cycle. It is a useful tool to solve the power shortage trouble of USB Bus powered products.