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**STEP n°4:** assemble Ohmpi
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| | .. image:: step_n_4/step_4_1.jpg |
| 1 +------------------------------------------------------------+
| |Cut 4 ribbon cables composed of 16 wires each to the proper |
| |length (about 1.5m). Each wire corresponds to an electrode. |
+--------+------------------------------------------------------------+
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| | .. image:: step_n_4/step_4_2.jpg |
| 2 +------------------------------------------------------------+
| |Crimp the ribbon cable on the corresponding idc connector |
| |with a suitable clamp. Pay attention to the direction of the|
| |cables. Unbalanced IDC connector. The ribbon cable must be |
| |perpendicular to the connector. |
+--------+------------------------------------------------------------+
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.. table::
:align: center
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| | .. image:: step_n_4/step_4_3.jpg |
| 3 +------------------------------------------------------------+
| |Example of IDC connector mounting. The wires should run as |
| |perpendicular as possible to the IDC connector. |
+--------+------------------------------------------------------------+
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| | .. image:: step_n_4/step_4_4.jpg |
| 4 +------------------------------------------------------------+
| |Same for a 6 wires ribbon cable of 1 m length. |
| | |
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| | .. image:: step_n_4/step_4_5.jpg |
| 5 +------------------------------------------------------------+
| |Cut the ribbon cable flush with the IDC connector. |
| | |
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| | .. image:: step_n_4/step_4_6.jpg |
| 6 +------------------------------------------------------------+
| |Position 9 spacers above the MUX board, and 9 spacers below.|
| | |
+ +------------------------------------------------------------+
| | .. image:: step_n_4/step_4_7.jpg |
| +------------------------------------------------------------+
| |Profile view for mounting the spacers above and below. |
| | |
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.. table::
:align: center
+--------+------------------------------------------------------------+
| | .. image:: step_n_4/step_4_8.jpg |
| 7 +------------------------------------------------------------+
| |Cut a 50 cm long wire of any color (here yellow). Strip and |
| |tin each end of the wire. Install the wire "A" on the screw |
| |terminal of MUX board « A ». |
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:align: center
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| | .. image:: step_n_4/step_4_9.jpg |
| 8 +------------------------------------------------------------+
| |Cut a red wire and a black wire of 50 cm length. Strip, tin |
| |and position the wires on the left screw terminal as shown |
| |in the picture: i)Red wire 12 V, ii) Black wire GND |
+--------+------------------------------------------------------------+
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:align: center
+--------+------------------------------------------------------------+
| | .. image:: step_n_4/step_4_10.jpg |
| 9 +------------------------------------------------------------+
| |Mount the 4 ribbon cables (16-wires each) with IDC |
| |connectors. A small noise is often heard when the IDC |
| |connector is clipped in place. |
+--------+------------------------------------------------------------+