A method of performing a vacuum test

The invention relates to a method of performing a vacuum test on a package, particularly in the food industry, comprising the following process steps: a wall of the vacuum package is excited by means of an actuator unit to vibrate; the vibrations of the wall excited to oscillations are detected by a detection unit by measurement for generating a measurement signal; from the measuring signal a quality measure is determined by comparison with reference data, wherein the quality measure to a Vakuumisierungsgrad the vacuum package correlated and the Vakuumisierungsgrad is a measure of a pressure difference between an internal pressure inside the vacuum packaging and acting from the outside on the vacuum packing external pressure.