Tektronix tek usb 488 usb to ieee488 gpib communications adaptor tektronix tek usb 488 p the tektronix tek usb 488 is an adaptor that allows you to connect a usb device port on your usbtmc usb488 compliant instrument such as a dpo4000 series oscilloscope to a gpib ieee488 controller p tektronix tek usb 488 usb to ieee 488 gpib communication adaptor