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__random vibration machine__which gives

**Grms**value based on

*Power Spectral Density*(PSD) plot using

*Fast Fourier transform*(FFT).

Before I ran the test on my specimen, I tried to characterise the vibration using a DDSR board (accelerometer). Interestingly, the

**G-force**recorded from the accelerometer far exceeds the values i've set on the random vibration machine.

Anyone knows why?