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本帖最后由 CHENGFEGO 于 2013-12-19 16:09 编辑
7 o5 T& u) G$ ~7 {lengchuan000 发表于 2013-12-19 15:48 ' d8 K# ^( l$ s
请教一下UL什么要求 3 B' z6 [; ~+ d5 w; r0 C- x% u
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a dial micrometer having a 6.3 to 6.4 mm (0.248 to 0.252 in) diameter flat presser foot+ Y3 i4 ~0 ` K9 ]+ b8 S+ F
exerting a total force of 0.83 ±0.03 N (3.0 ±0.1 ozf) on a rectangular anvil measuring b J" b; ]: Y7 D8 F0 E, c4 X: I; i
approximately 9 x 2 mm (0.35 x 0.08 in). The face of the anvil on the minor dimension shall be
7 z: A5 K `6 N. m' l$ P. V) Hslightly convex. Alternatively, these measurements shall be made with a dead-weight dial0 _% P+ X6 q- n# t
micrometer having a presser foot 6.4 ±0.2 mm (0.248 ±0.010 in) in diameter and exerting a total
- [2 Y6 _+ J) E* z; D8 Iof 85 ±3 gf or 0.83 ±0.03 N (3.0 ±0.1 ozf) on the specimen – the load being applied by means
. x" L. \* ^& N; N3 a2 `of a weight. The presser foot shall be at least 2 mm (0.08 in) onto the edge of the specimen for
% S& {: k3 o% u' Xeach measurement. Micrometers shall have a resolution and accuracy of 0.01 mm (0.001 in);
5 G5 |2 R! l4 ]4 }2 K/ b8 z5 cf) a micrometer with a resolution and accuracy of 0.001 mm (0.0001 in); Z& h! \2 ?0 O+ W) q h2 _% E/ l
就是UL用來測量啞鈴片厚度的,/ z5 e j- t! B' E. Q
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