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13.2.1 Compliance is checked by the following test:- U) c. B* L# u. b x% @9 y
The test is not made on parts of ceramic material or on insulation of wiring.
4 N- [5 `/ Z) FThe test shall be made in a heating cabinet having a temperature 25 °C ± 5 °C in excess of the) g& \, [! m4 N( \3 ~6 q) X
operating temperature of the relevant part determined during the temperature test (normal$ y) u/ s; g5 ?8 j6 G9 I% n( S
operation) of Section 12, with a minimum temperature of 125 °C when parts retaining currentcarrying
2 Y% q X7 z5 i5 [parts or SELV parts in position are tested, and 75 °C for other parts.9 Y% m5 S( g5 { x: K
The surface of the part to be tested shall be placed in the horizontal position and a steel ball of' h) U* n# @9 N$ s7 \% R' [
5 mm diameter pressed against this surface with a force of 20 N. A suitable apparatus for this/ v0 Y& l( |! b$ |- Q2 {# k, A8 I; N
test is shown in Figure 10. If the surface under test bends, the part where the ball presses) ]* b0 K# P2 y) a- x
should be supported.
4 F7 @. D" s( k& y+ s. lAfter 1 h, the ball shall be removed from the sample, and the sample shall be cooled by
! _# S' ]2 `# G" R# fimmersion in cold water for 10 s. The diameter of the impression shall be measured and shall* e. K% T) E' c) Y
not exceed 2 mm. |
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发表于 2012-3-9 11:27
