The TW8 Telecom Wave Impulse Module is the perfect extension of your AXOS 8 Immunity Test System if Telecom Surge Immunity Tests according to IEC/EN 61000-4-5 Ed. 3.0 need to be performed. As soon as the TW8 is being connected to the AXOS 8 it gets automatically indicated via the link cable (intelligent input). The user selects on the coupling unit (TW8 module) which impedance is required for the particular application.