Measurements of scattering parameters of RF cables, DC insulation resistance and LF impedance for DC/LF cables, and characterization of filters (attenuation, bandwidth, …) and amplifiers - HEMT and Josephson-based - (transmission, reflection, bandwidth, gain, noise temperature...), down to 10 mK, in experimental rooms with very well controlled environment (EM shielding, temperature and humidity control, low-vibrations). Testing at LNE under authorization (restricted access). Details to be discussed with the customer.