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本帖最后由 CHENGFEGO 于 2013-12-19 16:09 编辑
- C; A$ J( Y" z H) x' ~; blengchuan000 发表于 2013-12-19 15:48 9 w) L5 m9 l9 ]" ]+ W7 G; l
请教一下UL什么要求 , q/ P# L% S, K$ 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) b( b8 d+ t* i! Z V
exerting a total force of 0.83 ±0.03 N (3.0 ±0.1 ozf) on a rectangular anvil measuring
9 Q3 d" u/ d+ Happroximately 9 x 2 mm (0.35 x 0.08 in). The face of the anvil on the minor dimension shall be% }1 A" }2 F4 v
slightly convex. Alternatively, these measurements shall be made with a dead-weight dial
, b' w$ k" i8 r- H z) ]4 vmicrometer having a presser foot 6.4 ±0.2 mm (0.248 ±0.010 in) in diameter and exerting a total
( ^2 U/ I# m& V3 c& |, _$ hof 85 ±3 gf or 0.83 ±0.03 N (3.0 ±0.1 ozf) on the specimen – the load being applied by means
. F+ ] S2 s) k5 x# |of a weight. The presser foot shall be at least 2 mm (0.08 in) onto the edge of the specimen for) R$ p/ p8 e* ~. f
each measurement. Micrometers shall have a resolution and accuracy of 0.01 mm (0.001 in);
. A! ?' r, z1 Yf) a micrometer with a resolution and accuracy of 0.001 mm (0.0001 in);
9 h c& R' D1 |7 |4 H就是UL用來測量啞鈴片厚度的,
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