|
本帖最后由 CHENGFEGO 于 2013-12-19 16:09 编辑 9 U8 L4 _2 B; _
lengchuan000 发表于 2013-12-19 15:48 * i' I- c- x' p9 }
请教一下UL什么要求 0 C3 d. ]2 O6 Z/ e
5 }9 V; Q) M6 S
a dial micrometer having a 6.3 to 6.4 mm (0.248 to 0.252 in) diameter flat presser foot
% i ~& F) ]8 N R% fexerting a total force of 0.83 ±0.03 N (3.0 ±0.1 ozf) on a rectangular anvil measuring' i) I$ I1 k2 l7 Y. @' {
approximately 9 x 2 mm (0.35 x 0.08 in). The face of the anvil on the minor dimension shall be0 i2 P% ~6 r; F7 n
slightly convex. Alternatively, these measurements shall be made with a dead-weight dial# K$ ~) y+ u- y6 h: n
micrometer having a presser foot 6.4 ±0.2 mm (0.248 ±0.010 in) in diameter and exerting a total
5 i. d9 S/ v* sof 85 ±3 gf or 0.83 ±0.03 N (3.0 ±0.1 ozf) on the specimen – the load being applied by means
1 ~$ B" j1 m6 i7 C3 mof a weight. The presser foot shall be at least 2 mm (0.08 in) onto the edge of the specimen for
4 h* J8 @) y1 e" _% |1 Keach measurement. Micrometers shall have a resolution and accuracy of 0.01 mm (0.001 in);
4 }3 \# }1 p( Q; U6 E2 e7 B$ xf) a micrometer with a resolution and accuracy of 0.001 mm (0.0001 in);. |% o, I$ K( y+ R: L! G7 i: h0 V
就是UL用來測量啞鈴片厚度的,
% g4 M+ J# F' z2 u3 W; ]) q& [* b |
|