Active Vibration Isolation Peformance Comparison (INCONVENIENT TRUTH)

I’ve opportunities to measured others' active vibration isolation performance. The active vibration isolation manufacturers that I've measured are widely known which is shocking. I've realized that their active vibration isolation performance is not consistent with what they insist and state on their websites and catalogues. As the transmissibility(the ratio of output to input) graphs are clearly showing that DAEIL SYSTEMS's DVIA-MB1000 is outperforming others, the DVIA-MB reducing 90% of the floor vibration at 2 Hz, while IDE, Table Stable and Kukrashiki are reducing 15% to 26% of the floor vibration only in the Z axis(vertical). Simply, their active vibration isolation systems are ridiculously overrated and not sufficiently reducing floor vibrations below 5 Hz. If their active vibration isolation systems worked, then it indicates that the low frequency floor vibration of the installation site is not exceeding the electron microscopes' allowable vibration levels, meaning that you did not have to purchase the expensive active vibration isolation systems in the first place. The pneumatic vibration isolation system would do the job. However, there is a problem with the passive vibration isolation system that they tend to amplify floor vibrations around 1.5 - 3 Hz. Therefore, we need to calculate the amount of amplifications of the vibration would be generated by the passive vibration isolation system to examine whether the vibration exceeds the specification. When you consider installing the active vibration isolation systems for your electron microscopes, I recommend consult with a local vibration analysis to obtain accurate floor vibration data and then choose a suitable and optimal vibration isolation system from a vibration isolation system manufacturer with 100% performance transparency to save your money.?