| CPC G01V 7/12 (2013.01) [G01V 7/06 (2013.01); G04F 5/14 (2013.01)] | 27 Claims |

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1. A testing apparatus, comprising:
a central target arrangement comprising:
a pair of masses, and
a target coupled to the pair of masses;
a detector configured to recognize the target;
a stage;
a first spinner tower comprising a first rotatable mass, wherein the first rotatable mass is supported independently of the target and the pair of masses; and
a second spinner tower comprising a second rotatable mass, wherein each of the first spinner tower and the second spinner tower respectively comprises:
a tower housing coupled to a tower base, wherein the respective first rotatable mass or second rotatable mass is received within the tower housing, and
an electric motor mounted to the tower housing, the electric motor configured to rotate the respective first rotatable mass or second rotatable mass relative to the tower housing at a rotation speed.
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