Dear Team,
We have designed a carrier board for Jetson Xavier NX. We performed Pre-Compliance Testing for Radiated Emission with only an HDMI monitor connected; nothing else being run on the system. We found that the board emits radiation over the frequencies ~594MHz, 741MHz, 891MHz & crosses the limits of 57 dBuV/m. So we tested the Xavier NX DevKit in the set up & similar frequencies were observed as in the image attached.
DevKit is certified to 55032 & 55035. Kindly share the test report for the same.
We had added choke instead of 3.32E series resistor for HDMI interface. When we observed the failure, we replaced the series resistor with choke TDK# MCZ1210AH900L2TA0G since TDK# ACM2012D-900-2P was not recommended for new designs.
Please help us in solving this issue to suppress the radiations from the HDMI interface.
Hi, for custom design, the layout routing should follow the Product Design Guide. That will guarantee the layout quality. To reduce the possible RF EMI, the routing might need to be considered to run between two GND layer or something similar. Anyway, there is General Routing Guidelines in Product Design Guide that should be followed well, you can check that and try to optimize the design.
Hi,
The above screenshot was captured with Xavier NX DevKit, that itself shows failures. Could you please share the test setup of CE certification for the module? Was it qualified on the Xavier NX DevKit? Was Xavier NX qualified with HDMI interface in operational mode? Please share us a copy of the test report. We are keen to resolve this issue with our system at the earliest possible.
PS: Product Design Guidelines have been closely followed & results with series choke & resistors are separately available.
In the certification, for accessories, only power adapter is listed. Mention of keyboard, mouse, monitor etc are not available. Is it possible to view the CE Test Report?
Ok I understand. In this case, could you help me understand the difference between the unit that underwent CE certification & the production version? Are there any assembly or PCB related differences?