Table 4.

Accuracy and Coefficient of Variation of weight measurements acquired with the x- and y-direction load cells.

X-direction Load Cell
Weight (g)	Measured Weight Mean ± SD (g)	Accuracy of Measurement (%)	Coefficient of Variation
0	0	–	0
20	19.85 ± 0.43	99.3%	0.02
50	50.10 ± 0.44	99.8%	0.009
100	100.01 ± 0.12	99.9%	0.001
200	200.13 ± 0.05	99.9%	0.0002
500	499.77 ± 0.54	99.5%	0.001
Y-direction Load Cell
Weight (g)	Measured Weight Mean ± SD (g)	Accuracy of Measurement (%)	Coefficient of Variation
0	0	–	0
20	18.80 ± 0.27	94.0%	0.01
50	48.38 ± 0.24	96.8%	0.005
100	98.37 ± 0.26	98.4%	0.003
200	199.57 ± 0.46	99.8%	0.0023
500	501.35 ± 1.14	99.7%	0.0023