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本帖最后由 CHENGFEGO 于 2013-12-19 16:09 编辑
6 c5 b i, | I( B4 i/ Q- I. K8 nlengchuan000 发表于 2013-12-19 15:48
) ~4 \9 w- b. B7 U请教一下UL什么要求
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a dial micrometer having a 6.3 to 6.4 mm (0.248 to 0.252 in) diameter flat presser foot0 W& b- y, ~$ b5 I& u5 B+ X% H
exerting a total force of 0.83 ±0.03 N (3.0 ±0.1 ozf) on a rectangular anvil measuring0 q4 g" J# e( d2 u8 p
approximately 9 x 2 mm (0.35 x 0.08 in). The face of the anvil on the minor dimension shall be* }/ F) I5 |! w+ R W
slightly convex. Alternatively, these measurements shall be made with a dead-weight dial
: a+ O# D6 J% w Tmicrometer having a presser foot 6.4 ±0.2 mm (0.248 ±0.010 in) in diameter and exerting a total( j6 j; t$ ^ C0 U! B
of 85 ±3 gf or 0.83 ±0.03 N (3.0 ±0.1 ozf) on the specimen – the load being applied by means
6 P0 h/ C. v) lof a weight. The presser foot shall be at least 2 mm (0.08 in) onto the edge of the specimen for
9 y- V5 N1 P, }+ Neach measurement. Micrometers shall have a resolution and accuracy of 0.01 mm (0.001 in);
$ o# E% [# g' c! L$ c# |0 Kf) a micrometer with a resolution and accuracy of 0.001 mm (0.0001 in);0 O8 g4 o8 @5 C" X, b* Q2 x& R
就是UL用來測量啞鈴片厚度的,
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