diff --git a/PCB_file_measurement card/measurement_board/card_measure_raspberry_v4.00.fzz b/PCB_file_measurement card/measurement_board/card_measure_raspberry_v4.00.fzz
index 91764098ff0e5326decb6d2f27ad1a0469253a59..bb21aad0585f90d5dda49e49960ec2586f9b44c9 100644
Binary files a/PCB_file_measurement card/measurement_board/card_measure_raspberry_v4.00.fzz and b/PCB_file_measurement card/measurement_board/card_measure_raspberry_v4.00.fzz differ
diff --git a/sphinx/source/Ohmpi_V2_00/V2_00_step_03.rst b/sphinx/source/Ohmpi_V2_00/V2_00_step_03.rst
index 0bee11c28e3831f933527a2ce49398c6f1b12865..a6c39ea7f3ce6e881dadff4d4ed552e62777a75a 100644
--- a/sphinx/source/Ohmpi_V2_00/V2_00_step_03.rst
+++ b/sphinx/source/Ohmpi_V2_00/V2_00_step_03.rst
@@ -220,3 +220,53 @@ For the M electrode board, we suggest addressing it with address 0x73:
| |Zoom on the jumper |
| | |
+--------+------------------------------------------------------------+
+
+**PART C** Validation of MUX board
+======================================================
+the first step is to test the Mux boards before assembling them definitively.
+To test the Mux boards, it will be necessary first to make a simplified assembly of the Mux board and the measurement board.
+
+The first thing to do is to prepare a 50 cm long flat wire with two 6-poles connectors.
+
+
+ +--------+------------------------------------------------------------+
+ | | .. image:: step_n_3/c/20211206_172252.jpg |
+ | 1 +------------------------------------------------------------+
+ | |Build a cable with 6 contacts with 6 pins connector. |
+ | | |
+ +--------+------------------------------------------------------------+
+
+ +--------+------------------------------------------------------------+
+ | | .. image:: step_n_3/c/20220124_142929.jpg |
+ | 2 +------------------------------------------------------------+
+ | |Prepare the measurement board and the first mux board by |
+ | |example the card with address 0x71. |
+ +--------+------------------------------------------------------------+
+
+ +--------+------------------------------------------------------------+
+ | | .. image:: step_n_3/c/20220124_143105.jpg |
+ | 3 +------------------------------------------------------------+
+ | |Connect the cables for the 12V power supply to the MUX board|
+ | |without powering the board. |
+ +--------+------------------------------------------------------------+
+
+ +--------+------------------------------------------------------------+
+ | | .. image:: step_n_3/c/20220207_154111.jpg |
+ | 4 +------------------------------------------------------------+
+ | |Connect the 12V power supply screw terminal of the mux board|
+ | |to the 12V screw terminal power supply of the measurement |
+ | |board. |
+ +--------+------------------------------------------------------------+
+
+ +--------+------------------------------------------------------------+
+ | | .. image:: step_n_3/c/20220124_143823.jpg |
+ | 5 +------------------------------------------------------------+
+ | |Connecter le cable 6 contacts |
+ | | |
+ +--------+------------------------------------------------------------+
+
+
+Démarré votre alimentation
+
+
+
\ No newline at end of file
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