The distance between the mating Samtec ADM6–60–01.5–L–4–2–A connectors on the carrier card must match the distance between the ADF6–60–03.5–L–4–2–A connectors on the SOM.
See the note about the Samtec REF-226081 alternative mating connector.
The final connector position is dictated by auto-placement machine accuracy and PCB pad position tolerance. The way the distance is measured between connectors is crucial to ensure seamless board-to-board mating, without applying mechanical stress.
To determine the centroid of the connector, use the four corners of the connector edges marked with red circles as shown in the following figure. By using a high-accuracy optical measurement instrument, measure the distance D. Distance D should be 66.612 mm (nominal). The allowable distance D and tolerance is 66.612 ±0.04 mm center to center. The following table shows the recommended optical measurement instrument specifications.
| Name | OGP Smartscope |
| Model | CNC670 |
| Accuracy | ±5 μm |