Certifying your accelerometer units using gravity is a practical and cost-effective method. Here's a step-by-step guide on how we proceed with this certification process at ShotTrack:
1. Understand the Basics
Accelerometers measure acceleration forces. Using gravity, which provides a known acceleration of approximately 9.81 m/s², helps us calibrate and verify the accuracy of your accelerometers.
2. Gather Necessary Equipment
ViB-Pro, Nano or SaS Accelerometer Units: The units to be certified.
Stable and Level Surface: A flat surface for accurate measurements.
Calibration Platform: A rotating platform to change the orientation of the accelerometer relative to gravity.
Data Acquisition System: To read and record the output from the accelerometer, the ShockAi Admin App.
3. Calibration Setup
Positioning: Place the accelerometer on a stable, level surface. Ensure that it is oriented so that one of its axes is aligned with the direction of gravity (usually the z-axis).
Zero Gravity Measurement: Measure the output of the accelerometer when it is in a position where the axis of interest is perpendicular to the gravitational force (horizontal position). This should ideally read zero.
4. Conducting the Gravity Test
Vertical Alignment: Position the accelerometer such that its sensitive axis is aligned vertically with gravity. The reading should be close to ±9.81 m/s².
Inverting the Accelerometer: Flip the accelerometer 180 degrees along the same axis. The reading should be close to the opposite of the previous value (if it read +9.81 m/s², it should now read -9.81 m/s²).
5. Record Data
Record the output for both the vertical and inverted positions.
Calculate the average of these two readings. The average should be very close to zero, indicating the accelerometer is properly zeroed.
The difference between the readings in the two positions should be close to 19.62 m/s² (twice the gravitational acceleration).
6. Calibration and Adjustment
If the readings are not within acceptable tolerance levels, we adjust the accelerometer's sensitivity, and note the deviation for future reference and correction in data analysis.
7. Documentation
Record Results: Document the readings, the setup, and any adjustments made.
Certification Report: Prepare a certification report that includes the test setup, procedure, results, and any corrections or calibrations performed.
By following these steps, we effectively use gravity to certify the accuracy and performance of your ViB-Pro, Nano or SaS accelerometer units. This process ensures high precision and reliability for your applications.
