Table 5.

Measuring errors before and after correction of the piezoelectric sensor for step force.

Set	Subset	Amplitude of Fa/kN	Fm (Before Correction)		Fc (After Correction)
			Amplitude/kN	Error	Amplitude/kN	Error
1	1-1	50	51.06	2.12%	51.97	3.94%
	1-2	100	100.38	0.38%	102.15	2.15%
2	2-1	100	104.53	4.53%	103.47	3.47%
	2-2	200	211.85	5.93%	205.52	2.76%
	2-3	400	416.3	4.08%	379.88	5.03%
3	3-1	200	214.44	7.22%	203.92	1.96%
	3-2	400	382.35	4.41%	381.24	4.69%
	3-3	500	480.25	3.95%	492.82	1.44%
4	4-1	50	49	2%	48.2	3.61%