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Document MT1503P.A
© Xsens Technologies B.V.
Hardware Integration Manual MTi 1-series
4.2.2 Anchor points
Anchor points are usually a cause of mechanical torsional stress. The MTi 1-series module should not
be placed near an anchor point. Furthermore, since a plane is uniquely determined by three points, it is
recommended to affix the PCB with no more than three anchor points. More than three anchor points
over define the PCB plane and therefore induce mechanical stress. Figure 10 shows an example of a
PCB with four anchor points that gives a maximum stress in the centre of the diagonal crossover. Avoid
placing the MTi 1-series module in such an area.
Figure 10: High mechanical stress in diagonal crossover between anchor points
The best way to deal with the problem shown in Figure 10 is to remove one of the anchor points as
shown in Figure 11. This will reduce the overall stress in the PCB. If more anchor points are required
(e.g. in case of a large PCB) the MTi 1-series module should be moved to an area with minimal
mechanical stress, as shown in Figure 12.
Figure 11: Reducing anchor points to reduce overall stress in the PCB
Figure 12: Keeping the MTi 1-series module away from high mechanical stress areas
