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DRV-ACC16-EVM: G value calculation issue

Part Number: DRV-ACC16-EVM

Hi TI team,

1. I want to confirm with you that the algorithm for this waveform is 49(Vpeak)/57=0.86gpeak,

Or 76(Vpeak to peak)/57/2=0.667gpeak.

 Which algorithm is correct?

Judging from the following waveform.

2.The product we tested is vibrated through Piezo. Piezo is connected to a board to drive.

We directly use the oscilloscope to measure the waveform of the drive board connected to Piezo, as shown in the figure on the left. It can be seen that the amplitude of the waveform is very large.

The waveform on the right is measured by TI DRV-ACC16-EVM accelerometer attached to the measurement point. However, there are some stacked structures on piezo, so the vibration of piezo will pass through these structures before the G value can be measured by the TI DRV-ACC16-EVM accelerometer. It can be seen that the amplitude becomes very small.

We want to know why there is such a big difference in amplitude.

3.We have the G value measured using different accelerometers(Data on the left) and the G value measured using DRV-ACC16-EVM(Data on the right).
But the G value measured by DRV-ACC16-EVM is much smaller. 

Both accelerometers use the same measurement technique. We put Accelerometers on the measuring point to measure the G value of piezo vibration. There are some structures stacked above the piezo.

Do you know the possible reason?