The Keysight E2629A is used for system verification/calibration of the E2622A termination adapter when used with the 548XXA oscilloscopes. The E2629A is included with the Infiniium 548XXA option 100 Communication Mask Test Kit (or the E2625A Communication Mask Test Kit).
This product overview describes the features of the Infiniium 54800 Series Oscilloscopes it also includes information about the Infiniium Voice Control, Communication Mask Test Kit, and Software and Hardware Upgrade Options.