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,
& s! o5 [4 y: ~+ p( C8 [having a radius equal to 4,5 times the distance between fixing holes but, in any case, no less
, ~9 Q5 u" {  ~then 200 mm. The axes of the holes are in a plane perpendicular to the axis of the cylinder
: e( }) ^0 V  U! F4 x% I. yand parallel to the radius through the centre of the distance between the holes.
The fixing screws of the base are gradually tightened, the maximum torque applied being
0,5 Nm for screws having a thread diameter up to and including 3 mm and 1,2 Nm for screws
: v9 n% [9 l8 w0 B5 [9 N6 L/ ghaving a larger thread diameter.
The bases of socket-outlets are then fixed in a similar manner to a flat steel sheet.
1 D/ f) C9 ]6 k. }( w6 T6 c
+ k# }8 F& W4 }7 u问题：这个试验装置是什么样的？