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Choosing between 15g and 5g accelerometers

Coping with vibrations 

The 15g accelerometers is even a better choice when vibrations are higher than 5g, even if this is averaged out at 400 Hz. When the sensors (accelerometers, gyroscopes, accelerometers) clip at 10 kHz, the MTi will output a warning so that it is known to the user that the sensor data is compromised, even when data seems to be correct. 

The 15g accelerometers can cope with most vibrations that users in Industrial Applications encounter.

 

Quantization of the accelerometer data

With a 16-bit ADC on the analog accelerometers in the MTi 10-series and MTi 100-series, the quantization after sampling (m/s2/LSB) is around 0.0077 m/s2 for the 15g accelerometer and around 0.0023 m/s2 for the 5g accelerometer. With the accuracy of the MTi, the quantization would be noticable in the data. 

However, since the MTi 10-series and MTi 100-series are sampling at 10 kHz, the quantization almost entirely disappears when data has been processed by the high-performance signal processing pipeline. 

With a virtually unlimited resolution in the float or double format of the acceleration output, the choice for 15g accelerometers has no drawbacks. 

 

Product number

The accelerometer in the MTi can be identified by the number in the product type. The value directly following the A indicates a 5g accelerometer (5) or an 15g accelerometer (8). Example: MTi-300-2A5G4 is an MTi-300 AHRS with RS232 interface, 5g accelerometers and 450 deg/s gyroscopes.

 

Todo: add pictures showing:

- clipping at <10 kHz

- quantization error old MTi 18g vs quantization 5g 

 

 

 

 

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