iMX6 OpenRex EMC testing - Revision history

Voipac at 13:37, 6 April 2023

2023-04-06T13:37:20Z

Voipac at 14:26, 15 June 2022

2022-06-15T14:26:25Z

Voipac at 05:33, 24 April 2022

2022-04-24T05:33:24Z

Voipac at 20:53, 31 August 2021

2021-08-31T20:53:57Z

Voipac at 16:11, 24 August 2021

2021-08-24T16:11:52Z

Voipac at 08:11, 16 August 2021

2021-08-16T08:11:32Z

Voipac at 21:57, 3 June 2021

2021-06-03T21:57:22Z

Voipac at 21:42, 3 June 2021

2021-06-03T21:42:37Z

Voipac at 05:27, 26 April 2021

2021-04-26T05:27:33Z

Voipac at 05:26, 26 April 2021

2021-04-26T05:26:05Z

@@ Line 41: / Line 41: @@
 ==== Higher band 1GHz - 4GHz ====
-Two plots displaying the power density are used to show results in higher bands. Similar to lower frequencies a blue curve represents quasi-peak values. Class B limits applied for quasi-peak measurements is plotted as the higher placed red line '''22F_P_B'''.<br />
+Two plots displaying the power density are used to show results in higher bands. Similar to lower frequencies a blue curve represents quasi-peak values. Class B limits applied for quasi-peak measurements are plotted as the higher placed red line '''22F_P_B'''.<br />
 Black curve depicts average-power values. Threshold for average-power measurement is shown with the lower placed limit line called '''22F_AV_B'''.

@@ Line 5: / Line 5: @@
 Electromagnetic compatibility results for iMX6 OpenRex SBC are shown on this page. Test setup and scripts are described in details.<br /><br />
-These measurement were performed with the standard webshop configurations of the SBC, using actual hardware and software.
+These measurements were performed with the standard webshop configurations of the SBC, using actual hardware and software.
 == Connected cables/devices ==

@@ Line 8: / Line 8: @@
 == Connected cables/devices ==
-* '''Power jack:''' [https://www.voipac.com/#iMX6-PSA-00000000 +5V power supply] which is among recommended accessories for iMX6 OpenRex SBC
+* '''Power jack:''' [https://www.voipac.com/power-supply-5v-20w +5V power supply] which is among recommended accessories for iMX6 OpenRex SBC
 * '''SD card (Sandisk):''' preloaded with filesystem, used for booting and for read/write test
 * '''Ethernet:''' 1 meter CAT Ethernet [https://kb.juniper.net/InfoCenter/index?page=content&id=KB22174 loopback cable] connected. Forced to 100Mb and used for ping test
@@ Line 15: / Line 15: @@
 * '''USB micro to USB adapter:''' USB micro connector is set as a host and used during USB memory read/write test
 * '''Wifi PCIE mini card:''' inserted, but not actively used. No antennas connected
-* '''Debug cable:''' [https://www.voipac.com/#iMX6-TTL-00000000 FTDI TTL-3V3 UART to USB cable], used only to setup the board, not used and not plugged in during the measurements<br />
+* '''Debug cable:''' [https://www.voipac.com/ttl-232r-3v3-cable FTDI TTL-3V3 UART to USB cable], used only to setup the board, not used and not plugged in during the measurements<br />
 * '''Headphones and microphone:''' [https://www.amazon.co.uk/Genius-HS-M04SU-Luxury-Cancelling-Headset/dp/B00O4FOE2W headphones with microphone] connected to the 4-pole audio jack
 <br />

@@ Line 37: / Line 37: @@
 === Graph description ===
-==== Lower band 30kHz - 1GHz ====
+==== Lower band 30MHz - 1GHz ====
 Radiated emission is measured and displayed as quasi-peak values. This relation is represented as a blue curve in the measurements. Class B limits are shown by red highlighted line '''22F3M_B'''.
@@ Line 55: / Line 55: @@
 {|style="text-align:center;"
-| style="width: 47%;" |'''Vertical polarization'''
+| style="width: 47%;" |'''Vertical polarisation'''
 | style="width: 6%;" |<br />
-| style="width: 47%;" |'''Horizontal polarization'''
+| style="width: 47%;" |'''Horizontal polarisation'''
 |-
-|style="width:396px; border:1px solid black;" |<br />[[image:iMX6_OpenRex_SBC_Max-EMC-RE_30kHz-1GHz_Ver_pol.jpg|370px]]<br /><br />
+|style="width:396px; border:1px solid black;" |<br />[[image:iMX6_OpenRex_SBC_Max-EMC-RE_30MHz-1GHz_Ver_pol.png|370px]]<br /><br />
 |<br />
-|style="width:396px; border:1px solid black;" |<br />[[image:iMX6_OpenRex_SBC_Max-EMC-RE_30kHz-1GHz_Hor_pol.jpg|370px]]<br /><br />
+|style="width:396px; border:1px solid black;" |<br />[[image:iMX6_OpenRex_SBC_Max-EMC-RE_30MHz-1GHz_Hor_pol.png|370px]]<br /><br />
 |-
-|colspan="3"|iMX6 OpenRex SBC Max: 30kHz - 1GHz
+|colspan="3"|iMX6 OpenRex SBC Max: 30MHz - 1GHz
 |}
 <br />
 {|style="text-align:center;"
-| style="width: 47%;" |'''Vertical polarization'''
+| style="width: 47%;" |'''Vertical polarisation'''
 | style="width: 6%;" |<br />
-| style="width: 47%;" |'''Horizontal polarization'''
+| style="width: 47%;" |'''Horizontal polarisation'''
 |-
-|style="width:396px; border:1px solid black;" |<br />[[image:iMX6_OpenRex_SBC_Max-EMC-RE_1GHz-4GHz_Ver_pol.jpg|370px]]<br /><br />
+|style="width:396px; border:1px solid black;" |<br />[[image:iMX6_OpenRex_SBC_Max-EMC-RE_1GHz-4GHz_Ver_pol.png|370px]]<br /><br />
 |<br />
-|style="width:396px; border:1px solid black;" |<br />[[image:iMX6_OpenRex_SBC_Max-EMC-RE_1GHz-4GHz_Hor_pol.jpg|370px]]<br /><br />
+|style="width:396px; border:1px solid black;" |<br />[[image:iMX6_OpenRex_SBC_Max-EMC-RE_1GHz-4GHz_Hor_pol.png|370px]]<br /><br />
 |-
 |colspan="3"|iMX6 OpenRex SBC Max: 1GHz - 4GHz
@@ Line 89: / Line 89: @@
 {|style="text-align:center;"
-| style="width: 47%;" |'''Vertical polarization'''
+| style="width: 47%;" |'''Vertical polarisation'''
 | style="width: 6%;" |<br />
-| style="width: 47%;" |'''Horizontal polarization'''
+| style="width: 47%;" |'''Horizontal polarisation'''
 |-
-|style="width:396px; border:1px solid black;" |<br />[[image:iMX6_OpenRex_SBC_Basic-EMC-RE_30kHz-1GHz_Ver_pol.jpg|370px]]<br /><br />
+|style="width:396px; border:1px solid black;" |<br />[[image:iMX6_OpenRex_SBC_Basic-EMC-RE_30MHz-1GHz_Ver_pol.png|370px]]<br /><br />
 |<br />
-|style="width:396px; border:1px solid black;" |<br />[[image:iMX6_OpenRex_SBC_Basic-EMC-RE_30kHz-1GHz_Hor_pol.jpg|370px]]<br /><br />
+|style="width:396px; border:1px solid black;" |<br />[[image:iMX6_OpenRex_SBC_Basic-EMC-RE_30MHz-1GHz_Hor_pol.png|370px]]<br /><br />
 |-
-|colspan="3"|iMX6 OpenRex SBC Basic: 30kHz - 1GHz
+|colspan="3"|iMX6 OpenRex SBC Basic: 30MHz - 1GHz
 |}
 <br />
 {|style="text-align:center;"
-| style="width: 47%;" |'''Vertical polarization'''
+| style="width: 47%;" |'''Vertical polarisation'''
 | style="width: 6%;" |<br />
-| style="width: 47%;" |'''Horizontal polarization'''
+| style="width: 47%;" |'''Horizontal polarisation'''
 |-
-|style="width:396px; border:1px solid black;" |<br />[[image:iMX6_OpenRex_SBC_Basic-EMC-RE_1GHz-4GHz_Ver_pol.jpg|370px]]<br /><br />
+|style="width:396px; border:1px solid black;" |<br />[[image:iMX6_OpenRex_SBC_Basic-EMC-RE_1GHz-4GHz_Ver_pol.png|370px]]<br /><br />
 |<br />
-|style="width:396px; border:1px solid black;" |<br />[[image:iMX6_OpenRex_SBC_Basic-EMC-RE_1GHz-4GHz_Hor_pol.jpg|370px]]<br /><br />
+|style="width:396px; border:1px solid black;" |<br />[[image:iMX6_OpenRex_SBC_Basic-EMC-RE_1GHz-4GHz_Hor_pol.png|370px]]<br /><br />
 |-
 |colspan="3"|iMX6 OpenRex SBC Basic: 1GHz - 4GHz
@@ Line 130: / Line 130: @@
 === Starting DHCP server ===
 The boards were mainly operated through SSH sessions. Thus it is very useful to have the same IP address all the time. The easiest way to do so is to run DHCP server on the controlling computer. To allow boards using the same address enable persistent leases with a long duration (2880 min used below):<br />
-[[image:iMX6_TinyRex_Development_kit-Env_chamber-DHCP_settings.jpg|400px]]
+[[image:iMX6_OpenRex_SBC-Environmental_chamber-DHCP_setting.png|360px]]
 === Preserving SSH session ===
-To minimize the possiblity of results being affected, the control computer was disconnected and taken outside of the test chamber (after the board was setup).<br /><br />
+To minimise the possibility of results being affected, the control computer was disconnected and taken outside of the test chamber (after the board was setup).<br /><br />
 When Ethernet cable connected to a board is unplugged, Linux terminates all the processes started within SSH sessions by default. [https://www.gnu.org/software/screen/manual/screen.html ''Screen''] command allows to keep these sessions running. This command allow tasks to continue even if the cable is disconnected (and Ethernet loopback is plugged right away). It is important to make sure the filesystem includes this command:

@@ Line 5: / Line 5: @@
 Electromagnetic compatibility results for iMX6 OpenRex SBC are shown on this page. Test setup and scripts are described in details.<br /><br />
-These measurement were performed with the standard webshop configurations of the SBCs, using actual hardware and software.
+These measurement were performed with the standard webshop configurations of the SBC, using actual hardware and software.
 == Connected cables/devices ==

@@ Line 44: / Line 44: @@
 Black curve depicts average-power values. Threshold for average-power measurement is shown with the lower placed limit line called '''22F_AV_B'''.
-=== iMX6 OpenRex SBC Max - PASS ===
+=== iMX6 OpenRex SBC Max – PASS ===
 Test description:
 * stressapptest for CPU and memory
@@ Line 78: / Line 78: @@
 |}
-=== iMX6 OpenRex SBC Basic - PASS ===
+=== iMX6 OpenRex SBC Basic – PASS ===
 Test description:
 * stressapptest for CPU and memory

@@ Line 8: / Line 8: @@
 == Connected cables/devices ==
-* '''Power jack:''' [https://www.voipac.com/#iMX6-PSA-00000000 +5V power supply] which is included in webshop iMX6 OpenRex SBC kit
+* '''Power jack:''' [https://www.voipac.com/#iMX6-PSA-00000000 +5V power supply] which is included in iMX6 OpenRex SBC kit
 * '''SD card (Sandisk):''' preloaded with filesystem, used for booting and for read/write test
 * '''Ethernet:''' 1 meter CAT Ethernet [https://kb.juniper.net/InfoCenter/index?page=content&id=KB22174 loopback cable] connected. Forced to 100Mb and used for ping test
 * '''HDMI monitor:''' connected through 1.8m HDMI cable, monitor plugged into power but turned off.
 * '''2x USB flash drive:''' each connected through a 2m extension cable. Both used during read/write test
-* '''USB micro to USB adapter:''' USB micro connector is set as a host and it is used during USB memory read/write test
+* '''USB micro to USB adapter:''' USB micro connector is set as a host and used during USB memory read/write test
 * '''Wifi PCIE mini card:''' inserted, but not actively used. No antennas connected
 * '''Debug cable:''' [https://www.voipac.com/#iMX6-TTL-00000000 FTDI TTL-3V3 UART to USB cable], used only to setup the board, not used and not plugged in during the measurements<br />
@@ Line 50: / Line 50: @@
 * running heavy testing script for USB and SD card read/write test
 * HDMI output tested with 720p video stream
-* audio input
+* audio output
 * Ethernet SSH session
 <br />
@@ Line 84: / Line 84: @@
 * running heavy testing script for USB and SD card read/write test
 * HDMI output tested with 720p video stream
-* audio input
+* audio output
 * Ethernet SSH session
 <br />

@@ Line 135: / Line 135: @@
 To minimize the possiblity of results being affected, the control computer was disconnected and taken outside of the test chamber (after the board was setup).<br /><br />
-When Ethernet cable connected to a board is disconnected, Linux terminates all the processes started within SSH sessions by default. [https://www.gnu.org/software/screen/manual/screen.html ''Screen''] command allows to keep these sessions running. This command allow tasks to continue even if the cable is unplugged (and Ethernet loopback is plugged right away). It is important to make sure the filesystem includes this command:
+When Ethernet cable connected to a board is unplugged, Linux terminates all the processes started within SSH sessions by default. [https://www.gnu.org/software/screen/manual/screen.html ''Screen''] command allows to keep these sessions running. This command allow tasks to continue even if the cable is disconnected (and Ethernet loopback is plugged right away). It is important to make sure the filesystem includes this command:
 <syntaxhighlight lang="bash">
 sudo apt-get install screen