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本帖最后由 CHENGFEGO 于 2013-12-19 16:09 编辑
+ G% O* ?2 a2 n( d2 p* c2 ?. z0 Glengchuan000 发表于 2013-12-19 15:48
$ D; O& o$ {1 I请教一下UL什么要求
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1 s y- } v- f' o6 f, O, ]9 q9 Aa dial micrometer having a 6.3 to 6.4 mm (0.248 to 0.252 in) diameter flat presser foot
! S6 D( o5 \* L# c. Z7 ?# R/ Texerting a total force of 0.83 ±0.03 N (3.0 ±0.1 ozf) on a rectangular anvil measuring7 P( U+ C, P2 z; Z3 e
approximately 9 x 2 mm (0.35 x 0.08 in). The face of the anvil on the minor dimension shall be4 [1 Q1 b; g/ u6 B
slightly convex. Alternatively, these measurements shall be made with a dead-weight dial8 f5 b6 ` k$ }2 O" D
micrometer having a presser foot 6.4 ±0.2 mm (0.248 ±0.010 in) in diameter and exerting a total
0 l1 e+ ?0 x2 c, V8 tof 85 ±3 gf or 0.83 ±0.03 N (3.0 ±0.1 ozf) on the specimen – the load being applied by means
, D2 p: g9 E" q" f6 Q2 rof a weight. The presser foot shall be at least 2 mm (0.08 in) onto the edge of the specimen for) G$ T, @+ J$ A C% f3 ?
each measurement. Micrometers shall have a resolution and accuracy of 0.01 mm (0.001 in);& F' |+ B0 w* U) Z' I S, m
f) a micrometer with a resolution and accuracy of 0.001 mm (0.0001 in);5 b9 Y' _4 R9 q! @. M% |
就是UL用來測量啞鈴片厚度的,
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