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13.2.1 Compliance is checked by the following test:
6 M% S9 H0 {, {0 f( k, SThe test is not made on parts of ceramic material or on insulation of wiring.- }0 \ \5 j6 S' |
The test shall be made in a heating cabinet having a temperature 25 °C ± 5 °C in excess of the* z' Y. C2 R" a7 X2 X
operating temperature of the relevant part determined during the temperature test (normal
7 v0 ?, H* w; f2 Z( hoperation) of Section 12, with a minimum temperature of 125 °C when parts retaining currentcarrying
) m5 j1 k6 J. r7 j9 Vparts or SELV parts in position are tested, and 75 °C for other parts.
# z& E/ W5 t- p+ P7 M* yThe surface of the part to be tested shall be placed in the horizontal position and a steel ball of; R* F/ ~' S( o9 P
5 mm diameter pressed against this surface with a force of 20 N. A suitable apparatus for this
- I( Y- H9 f0 n+ G4 R& N$ T {test is shown in Figure 10. If the surface under test bends, the part where the ball presses* v3 z. v; v. B1 p
should be supported.+ J4 Q. ?, F& O7 c2 l! F! f
After 1 h, the ball shall be removed from the sample, and the sample shall be cooled by
' Z2 A" m0 {& T( a$ qimmersion in cold water for 10 s. The diameter of the impression shall be measured and shall
) v5 a/ z1 e V' fnot exceed 2 mm. |
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发表于 2012-3-9 11:27
