Marc with remote help of Matteo and Yuhang

We changed the ground of all DDS boards and the 500 MHz clock from the 'high quality ground' to 'ground' as in http://tamago.mtk.nao.ac.jp/tama/ifo/general_lib/circuits/000000_general/NIM_pin_connection.pdf

We tested that all components could be turned on and all applied voltages were correct.

We reinstalled the clock and DDS boards in the usual nim rack without issue.

DDS1 and DDS2 provide the expected signal (ie about +9/10dBm with internal amplifier and --8/9dBm without).

DDS3 have all outputs connected to internal amplifiers. Only the DAC0 provide the expected output. I checked that the output of the evaluation board is correct (-8dBm) so the issue is either in the internal amplifier or from loose connections.