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13.2.1 Compliance is checked by the following test:2 B' d6 J! m T9 h/ H
The test is not made on parts of ceramic material or on insulation of wiring.
; k, C3 I) c- [# NThe test shall be made in a heating cabinet having a temperature 25 °C ± 5 °C in excess of the" D. }$ O3 B: ?( i1 M1 G9 p0 u
operating temperature of the relevant part determined during the temperature test (normal
0 b$ S8 x8 T% Z! j2 {6 p, eoperation) of Section 12, with a minimum temperature of 125 °C when parts retaining currentcarrying
1 a2 x8 M6 S: ]) uparts or SELV parts in position are tested, and 75 °C for other parts.' d0 o- Q; D: s& e3 C- K9 b, @
The surface of the part to be tested shall be placed in the horizontal position and a steel ball of- ~7 \5 u+ R/ G( U& E, T Z$ G8 o
5 mm diameter pressed against this surface with a force of 20 N. A suitable apparatus for this/ ^( I5 x, Q9 o7 ^* Q( p! G
test is shown in Figure 10. If the surface under test bends, the part where the ball presses
; R" J$ z2 [3 s" nshould be supported.
% Y) v, [9 P* ]* O, |2 xAfter 1 h, the ball shall be removed from the sample, and the sample shall be cooled by' `' z V( h) |
immersion in cold water for 10 s. The diameter of the impression shall be measured and shall) \6 I2 d& R: f+ E$ q9 v2 H4 Y' N
not exceed 2 mm. |
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发表于 2012-3-9 11:27
