How to connect the shield ground of the power DTU to the power ground?

The connection between the DTU shield ground and power ground needs to be determined based on the shielding type and frequency. The cable shield is typically grounded at a single point on the receiving end to avoid ground loops. For high-frequency shielding, grounding at both ends is used, but it must be ensured that the potential difference between the two ends is small. The shielding layer is terminated 360 degrees to the housing via a shielding clip or connector metal shell. A high-voltage capacitor (1nF/2000V) can be used to connect the power ground (DC power supply ground) to the shield ground, providing a high-frequency path. On the PCB, the shield ground has a separate area, connected to the digital ground via a ferrite bead. Shielding effectiveness should be greater than 60dB in the 30MHz-1GHz range. Proper connection ensures effective shielding and reduces noise coupling.