Current mechatronic and mechanical devices are designed to maximize performance. They are thus driven near to stability limits. Aerostatic gas bearings are often used to support high speed rotors with higher loads. Their stability is thus one of major issues. To determine the rotor stability limits, precise gas film stiffness and damping values are necessary to be determined. There are already algorithms for calculation of aerostatic journal bearings stiffness and damping available, but up to now they were not experimentally verified and experimental results published.