CV测试中 Measure I over the last % of the step duration 百分数怎么选择？

CV测试中 Measure <I> over the last ... % of the step duration 这个百分数怎么选择？
selects the end part of the potential step (from 1 to 100%) for the current average (<I> calculation. It may be necessary to exclude the first points of the current response, which may only be due to the capacitive rather than faradic behavior of the system。
这个是关于这个参数的解释，但是没有看懂，有前辈能帮忙解释一下吗，非常感谢


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