|
本帖最后由 CHENGFEGO 于 2013-12-19 16:09 编辑
( W0 ]! k; v W; Elengchuan000 发表于 2013-12-19 15:48
3 [. g; W( P, G! k: f) ^' W请教一下UL什么要求 * Q9 ~; z2 k. |8 P: t- i1 u
6 _; h! P; S8 O2 O; A) d
a dial micrometer having a 6.3 to 6.4 mm (0.248 to 0.252 in) diameter flat presser foot
* `+ |# c: ` u" fexerting a total force of 0.83 ±0.03 N (3.0 ±0.1 ozf) on a rectangular anvil measuring. f. e* F6 U: b1 _ G7 [
approximately 9 x 2 mm (0.35 x 0.08 in). The face of the anvil on the minor dimension shall be! T" N. t! K, L* K( ` O$ F; F
slightly convex. Alternatively, these measurements shall be made with a dead-weight dial
4 X' P, F: x6 E: ^micrometer having a presser foot 6.4 ±0.2 mm (0.248 ±0.010 in) in diameter and exerting a total
) @- P( Q" B3 t( `8 gof 85 ±3 gf or 0.83 ±0.03 N (3.0 ±0.1 ozf) on the specimen – the load being applied by means, V; }% }+ _4 R& _/ w$ h6 Q9 v
of a weight. The presser foot shall be at least 2 mm (0.08 in) onto the edge of the specimen for
6 H, H; h( ?( Reach measurement. Micrometers shall have a resolution and accuracy of 0.01 mm (0.001 in);7 H. n8 X& X c
f) a micrometer with a resolution and accuracy of 0.001 mm (0.0001 in);: X5 P" t, ?2 Y2 {
就是UL用來測量啞鈴片厚度的,* I W, e2 x+ ]! Y( S. f% `0 B3 `
|
|