IEC 60884-1 clause 24.3如何理解？

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IEC60335试验指甲

24.3 The bases of surface type socket-outlets are first fixed to a cylinder of rigid steel sheet,
# r/ k* F' @2 o% K" R  R" F% X0 whaving a radius equal to 4,5 times the distance between fixing holes but, in any case, no less
then 200 mm. The axes of the holes are in a plane perpendicular to the axis of the cylinder
/ Q/ @' ?' ]" R! a9 L' Zand parallel to the radius through the centre of the distance between the holes.
, u0 H' I5 R1 ]3 q# [4 u) u3 [0 o+ GThe fixing screws of the base are gradually tightened, the maximum torque applied being
% t) J3 _5 J1 y- w- X- R0,5 Nm for screws having a thread diameter up to and including 3 mm and 1,2 Nm for screws
& O: B/ f" R, c6 a7 ghaving a larger thread diameter.
The bases of socket-outlets are then fixed in a similar manner to a flat steel sheet.
) o* D; G8 V! f7 t* I
9 Q* a0 Q5 \( E, G' p  v问题：这个试验装置是什么样的？
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