Device emulators for your most critical test: the system-level test The E Series is a game changer in system-level testing for high-speed protocols. It has evolved from being a tester to a highly integrated emulator; with either host controller or device emulation capabilities, the E Series can perform the same functions as a system in a mission environment. Your investment in this product will also yield long-term benefits as the E Series is suitable for high-volume manufacturing.