LISN doubt

[bonzer]

Hello everyone! Please help me to understand the structure of a Line Impedance Stabilization Network. I don't know if it's all the same around the world but I'm from Italy and so we have here Live,  Neutral and Protection Earth for power lines. What I know is that my power connection to the LISN should be filtered from incoming disturbances because I want only my EUT's conductive disturbances to be measured. I don't know if that may be useful to know but usually before power connection to LISN we have also a transformer used to prevent the activation of the differential interrupter because it could react as we have from live a current going to PE resulting in a difference from coming back current through neutral. Anyway my question is: this type of filter as showed in the schematic will for sure filter my CM disturbance coming from power. Would it also work for DM? I'm not sure about that.

--modified--
Just want to add that in the scheme by SA I mean Spectrum Analyzer, or it can be an ASA-Automatic Spectrum Analyzer. Capacitors are used to give low impedance in high frequency while the two inductors I suppose have no common core or negligible mutual inductance so they can give high impedance in high frequency.

[bjbb]

ISNs are described and/or specified per the EMC standard scoped for the end-use equipment. CISPR16-1-2 and ANSI C63.4 are common references. If you deviate from the suggested connections, your test data, at worst, may have no meaning; and at best, maybe valid only for comparison for your local stuff.

Test labs/notified bodies typically disallow the common 'safety' disconnect devices and employ large filter banks to supply their ISNs.