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本帖最后由 CHENGFEGO 于 2013-12-19 16:09 编辑
/ V# n+ B$ e1 `# C" ]7 {) P) ^lengchuan000 发表于 2013-12-19 15:48
! v3 \% V3 m$ i1 r3 l4 {" G4 w请教一下UL什么要求 4 Z$ C" g1 z# u; Y3 O q
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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
5 I8 J4 G9 C- T8 @$ w6 C+ v) r; }* S+ b& gexerting a total force of 0.83 ±0.03 N (3.0 ±0.1 ozf) on a rectangular anvil measuring' q6 H& m8 P6 T+ r0 S
approximately 9 x 2 mm (0.35 x 0.08 in). The face of the anvil on the minor dimension shall be: |: i; [; F/ k$ w; s
slightly convex. Alternatively, these measurements shall be made with a dead-weight dial2 j$ n2 A9 u% s7 O9 u% c5 D2 ^
micrometer having a presser foot 6.4 ±0.2 mm (0.248 ±0.010 in) in diameter and exerting a total
( ?# y3 W7 M1 }: ?9 rof 85 ±3 gf or 0.83 ±0.03 N (3.0 ±0.1 ozf) on the specimen – the load being applied by means, a( g7 X( N! _. w$ ]2 a; q6 |
of a weight. The presser foot shall be at least 2 mm (0.08 in) onto the edge of the specimen for( |/ `0 k: c' ?
each measurement. Micrometers shall have a resolution and accuracy of 0.01 mm (0.001 in);
9 a( ?7 Z6 H- D7 Z5 Ff) a micrometer with a resolution and accuracy of 0.001 mm (0.0001 in);
: w: G* r9 {: w& h& i3 H0 ~- @就是UL用來測量啞鈴片厚度的,. i; i+ Y; a R' o. w) C5 ^
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