Combining signal generator and integrated power amplifier, Model NSG 4060 meets requirements for immunity testing to low frequency disturbances in frequency range of 15 Hz to 150 kHz. Disturbances are coupled onto cables in common mode (IEC/EN 61000-4-16) with continuous levels up to 33 V or differential mode (IEC/EN 61000-4-19) with levels up to 22 V/4.5 A. System includes user port for 4 TTL inputs and 4 TTL outputs as well as supply voltages for individual monitoring and control applications.