The NNLK 8121 PLC features the possibility to extend the frequency range down. By connecting the low-frequency extension it features an impedance according to EN 50065-1.
This impedance has been designed for testing of low-frequency PLC equipment, but it can also be used for other devices.
The LISN can also be used for CISPR16-1-2 if the low-frequency extension is not connected.