In the selection of the vibration test apparatus, it is important to appropriately set the required thrust force (N) when carrying out the test. Calculate the required thrust according to F=ma, m is the sum of the mass of the fixture, the mass of the tested product, and the mass of the moving coil, and a is the acceleration. If the specifications of the test conditions can be met, the vibration test device corresponding to the test conditions shall be selected. If a part of the thrust exceeds the thrust of the test device, first select the test device that meets the test conditions, and then calculate the thrust on this basis.