iMX6 Rex EMC testing
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Electromagnetic compatibility results for iMX6 Rex Development kit are shown on this page. Test setup and scripts are described in details.
Connected cables/devices
- Power jack: +12V from an isolated source
- SD card 1 (the one on the PCB edge): preloaded with filesystem and used for booting
- SD card 2 (the one under heatsink): used for read/write testing
- RTC Battery: inserted in the holder
- Ethernet: Ethernet loopback cable connected. Forced to 100Mb and used for ping test
- HDMI monitor: during the test, the monitor is connected but turned off
- 2x USB memory stick: each connected through an extension cable. Both used during read/write test
- RS232: a null modem cable connected. During the test, the cable was terminated with an RS232 to USB converter
- SATA CFAST card (without the metal card holder): used for read/write testing
- Headphones & Microphone: standard headphones connected to the headphones and microphone jack
- Audio loopback: a cable connected between Line in and Line out
- Wifi PCIE mini card: inserted, but not actively used. No antennas connected
- Modem: inserted, but not actively used. No antennas connected, no SIM card inserted
Test description
The goal of this test was to check Radiated and Conducted emission of iMX6 Rex Development kit while running at very high load.
Running threads:
- CPU stress test
- Memory stress test
- GPU stress test (running a Full HD graphics test at rate 150 frames per second)
- Linux GUI
- Playing a video file
- Playing an audio file
- SD card test (SD card read & write stress test)
- 2x USB test (USB memory stick read & write stress test)
- SATA test (CFAST SSD card read & write stress test)
- Ethernet ping
Results
All the results were measured in compliance with the emission limits for FCC Class B (EMC standard EN 55022B). Class B devices are suitable for both residential and industrial applications as the standard use more restrictive limits.
Radiated emission
Running Linux only - PASS
| Vertical polarization | Horizontal polarization |
| 396px | 396px |
Heavy testing - PASS
| Vertical polarization | Horizontal polarization |
| 396px | 396px |
Conducted emission
The Development kit was powered by VER Series AC/DC Adaptor during the tests.
| Vertical polarization | Horizontal polarization |
| 396px | 396px |
