I am designing a sensor to measure vibration from industrial equipment.
The main required characteristics of the accelerometer are listed below:
- Acceleration Range - up to 8g
- Type - Digital
- Output Type - I²C, SPI
- Axis - X / Y / Z
- Bandwidth - minimum of 1.6KHz (as higher the better)
- Resolution - 16 bits
I found a lot of accelerometer that meet the specifications above, although I am not being able to understand how can I guarantee a good resolution in high frequencies of the accelerometer.
I already tested the MPU9250 in a shaker and the results in low frequency (until 150Hz) is reasonable, although in high frequencies (from 150Hz until 1kHz) it is horrible as shown below:
ps- the blue dots are the reference accelerometer (piezoeletric) and the orange dot is the MPU9250.
My question is:
- How can I understand from the datasheet that the resolution in high frequency will be ok?