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Accelerometer Drift?

Question asked by Terence Darwen on Nov 6, 2019
Latest reply on Nov 7, 2019 by Terence Darwen

I'm using an accelerometer from a different manufacturer to detect tilt over an extended period of time. I have the accelerometer securely mounted to a stationary object away from any vibration. Over the course of two and a half days, I've found the readings slowly change in value. I've made sure it's not a defective accelerometer by performing this experiment multiple times using different accelerometers but the same exact manufacturer and part number.

Below are graphs of the type of drift I see over time. You'll notice a change of about 0.006G on X, 0.009G on Y and .05G on Z. Note in the final graph below, the magnitude continually drops over time. I have no idea why this is. It should always be 1 or very close to 1.

Two questions:

  1. Is this a common or known phenomenon with accelerometers?
  2. Does NXP have an accelerometer where this undesirable behavior would not occur?

Thanks in advance for any information anyone might be able to provide.

Accelerometer X Drift

Accelerometer Y Drift

Accelerometer Z Drift

Accelerometer Magnitude Change

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