add test procedure for power distributor boards and use of serial numbers

diff --git a/documents/SerialNumbers.md b/documents/SerialNumbers.md
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+Serial Numbers
+==
+
+
+|Board|Amount|Range|
+|---------------------|--------|-----------|
+| PowerDistributor    | 40     | 050 - 099 |
+| PowerBoard          | 120    | 100 - 299 |
+| short MBO           | 320    | 300 - 799 |
+| long MBO            | 160    | 800 - 999 |
+
+OEP and DBO do not require serial numbers. 

diff --git a/documents/TestPowerDistributor.md b/documents/TestPowerDistributor.md
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+Power Distributor Testing
+==
+
+
+* mount 2 screws to secure green power socket
+* check R42 / R43 solder bridges
+* add serial number sticker
+* connect 5V to pin 2 and GND to pin 3
+  * power consumption: ~ 950 mW
+* connect UART for programming
+* short boot pins, press reset button
+* program
+* reset, check power consumption
+* install display
+* connect LAN cable
+* put MAC to database file
+* test temperature sensor
+  * command: 
+* connect LVDS pulse generator to Reference time connector
+* check all 20 outputs for proper signals
+* mount to base plate
+* connect 4 power cables
+
+
+Full communication test will be done once Powerboards are installed