|
楼主 |
发表于 2008-4-9 11:34
|
显示全部楼层
但是在UL1581 200 中也有讲到用测微计/千分尺去测量啊!但是我有点怀疑这样的可操作性,特别是我们买人家的电线,想检查,用这样的方法是不是很容易引起争议啊!
+ W' a7 w& T7 t$ i4 Q! S3 O- q( O在实际的操作中,以什么样的方式会更好一点啊!& e0 x, p# u/ }/ Y" Z- k1 ~$ G8 I
200 Conductor Diameter
5 ]7 t- |+ r" d* ]200.1 Regardless of whether any tin or other metal coating is employed, measurements of the diameter of a solid conductor are to be made over such coating by means of a machinist’s micrometer caliper having flat surfaces both on the anvil and on the end of the spindle and calibrated to read directly to at least 0.001 inch or 0.01 mm, with each division of a width that facilitates estimation of each measurement to 0.0001 inch or 0.001 mm. The maximum and minimum diameters at a given point on the conductor are each to be recorded to the nearest 0.0001 inch or 0.001 mm, added together, and divided by 2 without any rounding of the sum or resulting average.
- P1 a, O+ n- v200.2 Each minimum diameter in Table 20.1 is an absolute minimum. The unrounded average of the two
^) _ Y+ |' L; Bmicrometer readings is therefore to be compared directly with the minimum in the table for the purpose of
6 J- i3 ?/ S# x, O3 P! `determining whether the solid conductor does or does not comply with the diameter requirement. |
|