In order to be compliant to the standards ECE R10.06, CISPR 12 and PSA (which require a capacitance of in total 1 uF parallel to a resistance of 1 MΩ at the input side of the LISN) a 0.9 μF capacitor like the CAP 0.9-400 has to be connected to the mains terminals of the NNHV 8123-400 or NNHV 8123-800 LISN.
To be compliant to the standards DEF STAN 59 and DO 160 a 10 μF capacitor like the CAP 10 has to be connected to the mains connectors of the LISN.