The IC-CPD is so positioned, by variation of the distance between the fixing part of the oscillating member and the axis of oscillation, that the cord makes the minimum lateral movement when the oscillating member of the test apparatus is moved over its full travel.In order to have the possibility of finding easily by experiment the mounting position with the minimum lateral movement of the cord during the test, the flexing apparatus should be built in such a way that the different supports for the accessories mounted on the oscillating member can be readily adjusted.It is recommended that the test apparatus has provisions (e.g. a slot or a pin) making it possible to see whether the cord makes the minimum lateral movement.