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本帖最后由 CHENGFEGO 于 2013-12-19 16:09 编辑
; c1 s& ^9 V% L" v9 t2 ]) olengchuan000 发表于 2013-12-19 15:48
% j; t! |+ ?0 H* S请教一下UL什么要求 , Y' Q" b1 N4 Z1 x1 O3 r
( a+ h7 i7 l- W( }a dial micrometer having a 6.3 to 6.4 mm (0.248 to 0.252 in) diameter flat presser foot# f( c9 j2 H9 A3 b d% b6 M! A. ~# Q
exerting a total force of 0.83 ±0.03 N (3.0 ±0.1 ozf) on a rectangular anvil measuring% Z' x& _- [" c( e! a2 s
approximately 9 x 2 mm (0.35 x 0.08 in). The face of the anvil on the minor dimension shall be* A: g# s8 P4 \5 ]2 F% n
slightly convex. Alternatively, these measurements shall be made with a dead-weight dial
w- x/ A' e1 S7 t) |+ ^micrometer having a presser foot 6.4 ±0.2 mm (0.248 ±0.010 in) in diameter and exerting a total- A" z$ J6 v- G$ z2 f& k: p
of 85 ±3 gf or 0.83 ±0.03 N (3.0 ±0.1 ozf) on the specimen – the load being applied by means J" r0 Z8 s# `* p9 N& }6 c' Y
of a weight. The presser foot shall be at least 2 mm (0.08 in) onto the edge of the specimen for
2 @3 B% x5 N$ M I. ieach measurement. Micrometers shall have a resolution and accuracy of 0.01 mm (0.001 in);% X+ F- |" q- Z8 \% n
f) a micrometer with a resolution and accuracy of 0.001 mm (0.0001 in);
' Z9 z- T% T# l2 @8 b% i就是UL用來測量啞鈴片厚度的,
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