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关于电线护套的厚度测试,请注意,UL2556里面的要求已经修改。近来检查员在核对这个,搞得工厂不明就里。
8 @4 V. }& C6 q4.2.3 Apparatus1 ]2 c0 ~3 ?: a5 h2 A3 l
e) a dial micrometer having a 6.3 to 6.4 mm (0.248 to 0.252 in) diameter flat presser foot
+ S0 t9 K7 N& N0 \4 nexerting a total force of 0.83 ±0.03 N (3.0 ±0.1 ozf) on a rectangular anvil measuring# M3 h# f7 L4 D9 l, C/ A
approximately 9 x 2 mm (0.35 x 0.08 in). The face of the anvil on the minor dimension shall be) B0 M0 _) g5 I4 ^
slightly convex. Alternatively, these measurements shall be made with a dead-weight dial2 _$ G* `- L7 G% X7 P' c
micrometer having a presser foot 6.4 ±0.2 mm (0.248 ±0.010 in) in diameter and exerting a total
3 r% T) x) f: A: |of 85 ±3 gf or 0.83 ±0.03 N (3.0 ±0.1 ozf) on the specimen – the load being applied by means1 ]- t2 E# a- f3 F/ {* `8 R
of a weight. The presser foot shall be at least 2 mm (0.08 in) onto the edge of the specimen for
2 i0 s0 Y2 e( v3 B% Eeach measurement. Micrometers shall have a resolution and accuracy of 0.01 mm (0.001 in); |
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