We present in this paper the status and preliminary results of an experiment to create a calibrated profile of turbulent layers, both in position and strength, using a calibrated hot air turbulence generator (turbulator), in so-called multi-pass mode. Cn2 profile is retrieved using the SLODAR technique. First results, with only one layer, show the validity of our approach, and give us confidence that a multiple pass scheme is doable and measurable with a few modifications of the current set-up.