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13.2.1 Compliance is checked by the following test:! a D6 N; n) q. z, C0 J, Z5 O
The test is not made on parts of ceramic material or on insulation of wiring./ v" e; i p# L& w- V
The test shall be made in a heating cabinet having a temperature 25 °C ± 5 °C in excess of the: ?) p8 B& B- E E# B
operating temperature of the relevant part determined during the temperature test (normal, i1 \7 e# W: Z
operation) of Section 12, with a minimum temperature of 125 °C when parts retaining currentcarrying
4 n: W: @. ~: Y5 dparts or SELV parts in position are tested, and 75 °C for other parts.( p. n; M$ m( F- n- ?0 u
The surface of the part to be tested shall be placed in the horizontal position and a steel ball of
2 D( R3 {" s$ f& ~, @/ k5 mm diameter pressed against this surface with a force of 20 N. A suitable apparatus for this
9 I. m% m7 T6 J% l( o' Etest is shown in Figure 10. If the surface under test bends, the part where the ball presses U$ y& _- P& }9 [$ o1 A' o7 X
should be supported.
$ z+ x* y0 O& n8 zAfter 1 h, the ball shall be removed from the sample, and the sample shall be cooled by
5 ^* D1 R$ H1 m; W9 v" A) n9 Q) nimmersion in cold water for 10 s. The diameter of the impression shall be measured and shall
& H) H- {$ c5 z: L3 ~/ bnot exceed 2 mm. |
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发表于 2012-3-9 11:27
