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ADXL326 frequency response drop seriously

Thread Summary

The user is experiencing a significant drop in acceleration magnitude on the ADXL326's X axis when the frequency exceeds 500 Hz, which is much lower than the specified 1.6 kHz bandwidth. The final answer suggests checking the vibration source, mounting method, and comparing all three axes, noting that the data resembles the Z axis response. The user had set the RC filter capacitance to 3 nF.
AI Generated Content
Category: Hardware
Product Number: ADXL326

Hi ADI guys,

  We test ADXL326 recently as our new project application for low-frequency vibration ,and find there is some  frequency response problem,

  We test X axis ,when the frequency  exceed 500HZ, the acceleration magnitude drop seriously, as below:

    

frequency(Hz)   Acceleration
50 130
100 130
400 130
700 118
1000 2.8
1300 2.46

           The actual bandwidth is much lower than 1.6KHz from the spec,How can we improve the ADXL326 BW? We set the  the Cout of the RC filter about 3nf .

     Thanks a lot!

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