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本帖最后由 CHENGFEGO 于 2013-12-19 16:09 编辑
' ~. L2 b6 W3 f6 `1 L- o4 h' @6 T7 Elengchuan000 发表于 2013-12-19 15:48
# Z. [5 y' ^( [1 j请教一下UL什么要求 $ \8 X! b" M4 ]! O9 U& _& g
: \: @5 G9 Q8 l& W. Z& u- ?a dial micrometer having a 6.3 to 6.4 mm (0.248 to 0.252 in) diameter flat presser foot! j2 M( R' I! K
exerting a total force of 0.83 ±0.03 N (3.0 ±0.1 ozf) on a rectangular anvil measuring' |4 F' {1 q/ N, q
approximately 9 x 2 mm (0.35 x 0.08 in). The face of the anvil on the minor dimension shall be0 n& r% L6 R$ p" }
slightly convex. Alternatively, these measurements shall be made with a dead-weight dial, i4 C$ n9 _, |
micrometer having a presser foot 6.4 ±0.2 mm (0.248 ±0.010 in) in diameter and exerting a total
1 ~, @9 k! ~3 G8 \( D% l$ wof 85 ±3 gf or 0.83 ±0.03 N (3.0 ±0.1 ozf) on the specimen – the load being applied by means2 g# f% B: S ?; j0 |
of a weight. The presser foot shall be at least 2 mm (0.08 in) onto the edge of the specimen for
. V; h& b' b$ B6 `/ f n. |each measurement. Micrometers shall have a resolution and accuracy of 0.01 mm (0.001 in);* l1 T; v7 c. M+ u1 ]- n
f) a micrometer with a resolution and accuracy of 0.001 mm (0.0001 in);
}) G* {4 B$ E0 w T( b `; ^就是UL用來測量啞鈴片厚度的,% k: ~1 ~+ k7 |( X6 ~
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