2017.06.19 FwdMan2.8.17.docx 1-5
1.4 Performance Specifications
1.4.1 Accuracy
The deflections are measured with an absolute accuracy of better than 2% ± 2 microns, and
with a typical, relative accuracy of 1% ± 1 micron. The resolution of the equipment (in terms
of deflection) is 0.1 micron (1 micron = 0.04 mil).
The load is measured with an accuracy of better than 2% ± 0.3 kN. The resolution of the
equipment (in terms of load) is 0.03 to 0.2 kN (7 to 45 lbf), magnitude dependent.
1.4.2 Reproducibility
The reproducibility of successive FWD/HWD tests run on the same elastic materials is
typically 1% in terms of the load/deflection ratio, for a given falling height and mass
configuration.
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