Difference between revisions of "iMX6 Rex EMC testing"

Revision as of 11:26, 26 March 2021

Electromagnetic compatibility results for iMX6 Rex Development kit are shown on this page. Test setup and scripts are described in details.

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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

@@ Line 40: / Line 40: @@
 == 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 ===
-All the results were measured in compliance with the emission limits for FCC Class B (EMC standard EN55022B). Class B devices are suitable for both residential and industrial applications as this standard use more restrictive limits.
 ==== Running Linux only - PASS ====
@@ Line 51: / Line 51: @@
 |[[image:iMX6_Rex_Development_kit-EMC_results-Linux_only_vertical.jpg|396px]]
 |[[image:iMX6_Rex_Development_kit-EMC_results-Linux_only_horizontal.jpg|396px]]
+|}
+==== Heavy testing - PASS ====
+{|
+|style="text-align:center;" |Vertical polarization
+|style="text-align:center;" |Horizontal polarization
+|-
+|[[image:iMX6_Rex_Development_kit-EMC_results-Heavy_loaded_vertical.jpg|396px]]
+|[[image:iMX6_Rex_Development_kit-EMC_results-Heavy_loaded_horizontal.jpg|396px]]
+|}
+=== Conducted emission ===
+The Development kit was powered by [https://uk.farnell.com/xp-power/ver36us120-ja/adaptor-ac-dc-12v-3a/dp/2646341?rpsku=rel3%3AVEP36US12&st=vep36us12 VER Series] AC/DC Adaptor during the tests.
+{|
+|style="text-align:center;" |Vertical polarization
+|style="text-align:center;" |Horizontal polarization
+|-
+|[[image:iMX6_Rex_Development_kit-EMC_radiated_emmision_power_cable_L.jpg|396px|link=http://downloads.voipac.com/files/iMX6_Rex_Development_kit/module/documents/EMC_conducted_emission/iMX6_Rex_Development_kit-Conducted_Emission_E022EL.pdf]]
+|[[image:iMX6_Rex_Development_kit-EMC_radiated_emmision_power_cable_N.jpg|396px|link=http://downloads.voipac.com/files/iMX6_Rex_Development_kit/module/documents/EMC_conducted_emission/iMX6_Rex_Development_kit-Conducted_Emission_E022EN.pdf]]
 |}