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本帖最后由 CHENGFEGO 于 2013-12-19 16:09 编辑 # f7 C a# o* X: b
lengchuan000 发表于 2013-12-19 15:48
* R, E# A& K3 Z, a2 V请教一下UL什么要求 / u: W5 k+ s9 }( T" A8 u6 O' t
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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! u. P6 I. K) U9 `1 U3 c7 k
exerting a total force of 0.83 ±0.03 N (3.0 ±0.1 ozf) on a rectangular anvil measuring
" t. Z* ~) v6 @3 ~0 j% Napproximately 9 x 2 mm (0.35 x 0.08 in). The face of the anvil on the minor dimension shall be; F* ]6 ~" v" P9 t, w/ Y% t
slightly convex. Alternatively, these measurements shall be made with a dead-weight dial
* ]% ^, ^0 x* d, r- _& y1 Umicrometer having a presser foot 6.4 ±0.2 mm (0.248 ±0.010 in) in diameter and exerting a total1 l x! {/ G& p& u& m9 T
of 85 ±3 gf or 0.83 ±0.03 N (3.0 ±0.1 ozf) on the specimen – the load being applied by means) v$ V6 F1 I" G$ |) O8 g# z- y
of a weight. The presser foot shall be at least 2 mm (0.08 in) onto the edge of the specimen for
5 E2 \8 m* H9 w% f$ {7 r( |each measurement. Micrometers shall have a resolution and accuracy of 0.01 mm (0.001 in);" X- D1 v) M0 f. B e
f) a micrometer with a resolution and accuracy of 0.001 mm (0.0001 in);& G. I9 @& ^0 f% A7 m4 W
就是UL用來測量啞鈴片厚度的,
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