As with measurements in general, there is inherent variability in tribometric test results. This paper discusses the limitations of using single-point characterization in setting tribometric Acceptance Thresholds. A useful technique for explicitly accounting for the variability in a given tribometer/test foot/test surface combination is frequency-based characterization. This paper will discuss weaknesses of single-point characterization of tribometric results and, briefly, how to set two-point Acceptance Thresholds for slip-resistance.
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