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13.2.1 Compliance is checked by the following test: ]4 O% P$ b- l. U* d
The test is not made on parts of ceramic material or on insulation of wiring.) [' A( W9 R5 w9 _; ^
The test shall be made in a heating cabinet having a temperature 25 °C ± 5 °C in excess of the
! ]' @" s3 Y! i# E9 Woperating temperature of the relevant part determined during the temperature test (normal
. F2 ]2 N; D. M- p8 Noperation) of Section 12, with a minimum temperature of 125 °C when parts retaining currentcarrying
. C! w I2 l5 t' J1 u9 wparts or SELV parts in position are tested, and 75 °C for other parts.+ ]. N( c' h5 i" _3 x7 l8 F0 p
The surface of the part to be tested shall be placed in the horizontal position and a steel ball of
0 z1 Y- z2 L5 _0 c0 }5 mm diameter pressed against this surface with a force of 20 N. A suitable apparatus for this
! u) a5 I4 w& c% V% S4 ]6 utest is shown in Figure 10. If the surface under test bends, the part where the ball presses
5 q j [) @5 O: Y# oshould be supported.6 c/ F. E( C% L6 s
After 1 h, the ball shall be removed from the sample, and the sample shall be cooled by: `! \: }; a8 z/ U# ]1 f4 h6 c
immersion in cold water for 10 s. The diameter of the impression shall be measured and shall
, }" i; g* z5 V/ wnot exceed 2 mm. |
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发表于 2012-3-9 11:27
