The Optima Human Performance System is a revolutionary development in force measurement technology, offering a 10-fold improvement over any force platform system on the market.
- Average COP accuracy of just a fraction of a millimeter (typically less than 0.2)
- Crosstalk values typically ±0.05% of applied load
- Measurement accuracy typically ±0.1% of applied load*
How do we know the performance of the Optima HPS is that good? AMTI verifies the accuracy of each Optima system through a proprietary Precision Calibration that takes up to 4000 measurements throughout the platform’s entire rated capacity. This process uses a high-density calibration grid that covers the entire platform surface and uses fully documented NIST-traceable standards.
Precision Calibration OverviewThe calibration of an Optima system is an exacting process involving up to 4000 measurements taken over the entire working surface.
Multiple loads are applied at up to 400 locations using a precision machine capable of maintaining absolute positioning accuracy of 0.005 mm (certified by The Association For Manufacturing Technology).
First, live loads from 222 N (50 lb.) to Full Scale Capacity (FSC) are applied across the top and sides of the force plate.
Next, dead weights of 222 N, 445 N, and 890 N (50, 100, 200 lb.), accurate to 0.01%, are used to verify the system’s performance in the physiological testing range.
Finally, secondary characteristics, such as linearity and hysteresis are measured at eight locations using a ten-point-up, ten-point-down calibration protocol.
This exhaustive calibration and verification process ensures that each Optima system offers the best possible quality, accuracy, and performance available.
Optima Performance Results
The plots to the right show the unmatched performance of the Optima Human Performance System. Each intersection of the grids represents a physical location at which performance verification data was taken; any platform error is shown on the Z axis.
COP error is determined by loading the platform at precise locations. The plots shown represent the performance with a 890 N (200 lb.) applied Fz load. A precision machine capable of maintaining absolute positioning accuracy of 0.005 mm (0.0002 in.) is used to locate the weights on a grid spacing of 1 inch (25.4 mm) yielding 300 measurement points. The COP plots represent the COP error on the Z axis with the platform X and Y coordinates on the X and Y axes.
Fz accuracy is measured by loading the platform as described for COP error above. The accuracy is determined by scaling the Fz output and then subtracting that value from the known NIST-traceable dead weight value. The difference is the error, which when divided by the known applied load is the accuracy of the Fz measurement. Fz accuracy is reported as a percentage of applied load.
Fz to Fx and Fy crosstalk is measured by loading the platform as described for COP error above. The crosstalk is determined as the ratio of the Fx or Fy output (scaled to represent Newtons of force) and the applied Fz load (the weight). As dead weights do not apply any side load this is a very accurate way to determine the crosstalk at that particular load. Fx and Fy crosstalk are reported in units of percent applied load.
Mz crosstalk is measured by loading the platform as described for COP error above.
* Minimum applied load of 222 N (50 lb.)