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13.2.1 Compliance is checked by the following test:
% y a; I; _2 I* f2 W- e2 M2 k WThe test is not made on parts of ceramic material or on insulation of wiring.
) G$ G( k6 Y, @2 V* r6 WThe test shall be made in a heating cabinet having a temperature 25 °C ± 5 °C in excess of the: X8 R S* {6 M2 n/ ~0 L. A6 ?
operating temperature of the relevant part determined during the temperature test (normal
, U; G# C) G- u; K4 @; B& {! }operation) of Section 12, with a minimum temperature of 125 °C when parts retaining currentcarrying2 y/ ^5 I3 Y5 E% x P! H# e# m! v
parts or SELV parts in position are tested, and 75 °C for other parts.5 z4 B: Q* y7 ~2 Q: P3 L. p
The surface of the part to be tested shall be placed in the horizontal position and a steel ball of
! \3 }) l5 _" Q/ D/ I! ^3 k5 mm diameter pressed against this surface with a force of 20 N. A suitable apparatus for this
i4 w( o% i8 m% a1 Ftest is shown in Figure 10. If the surface under test bends, the part where the ball presses$ ]8 f, l: P+ r. M/ {3 o4 X. \
should be supported.
) f: K( }: E7 ~( G+ ]8 N3 g, v/ c6 |After 1 h, the ball shall be removed from the sample, and the sample shall be cooled by, {, _" k5 `3 h5 s/ G
immersion in cold water for 10 s. The diameter of the impression shall be measured and shall
6 O3 V# x; q) Ynot exceed 2 mm. |
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发表于 2012-3-9 11:27
