HeNOS is a test bench designed to be a scaled down version of NFIRAOS, the rst lightMCAO instrument for the Thirty Meter Telescope. The system was designed and built in theadaptive optics lab at NRC Herzberg in Victoria. The goal of the test bench is to assess theprediction quality of MAOS, the simulation software for NFIRAOS, to test the robustness ofthe tomographic algorithm under slowly changing conditions and to evaluate the calibrationmethods considered for the real instrument. For these tasks it is important to know the realdimensions of HeNOS with good precision. The goal of the tests presented here is to obtain thesystem parameters from the bench and compare them to the design.