请问:UL电线绝缘内表面不规则,绝缘厚度如何测量?
UL AWM电线绝缘厚度,依据标准UL 2556,要求取5个试样(绝缘薄片),分别测量每个试样绝缘厚度的最大值和最小值。附图为绝缘切面的投影图,绞合导体导致绝缘内表面不规则。
这种情况该如何测量?
最小厚度在A点读取,那么最大厚度在B点还是C点读取?(B点厚度小于C点) 附UL2556标准相关章节:
4 Insulation and jacket materials tests
4.1 Thickness
4.1.4.2.1 Averaging method
The minimum and maximum thickness shall be determined using the procedures described in Clause
4.1.4.1.1 or 4.1.4.1.2. For insulation, measurements shall be made within the irregularities resulting from
conductor stranding. For extruded-to-fill jackets, all measurements shall be made within the irregularities
resulting from the conductors. If the pin described in Clause 4.1.4.1.1 does not fit within the irregularities,
this method is not applicable. 楼主,给你一份图文并茂的测试方法。。。。。 2楼的是厚度测试仪法。我要光学投影法。 看看什么资料 As per the UL758& UL1581 for AWM,
and UL62&UL1581 for flexible cords.... 只知国标,不知UL。 继续等待高手解答。 5个试样、10个点,每点在不规则凹槽最薄处 楼上,每点(即10个点)都在不规则凹槽最薄处?
最小值是在凹槽最薄处。
最大值在哪里读取?
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