The "dead" Q-Switch signal was converted 
two times... This explains why in the 
Thorium experiment the Q-Switch signal 
(ch15) was empty. 

First conversion from TTL to NIM in the 
ESR Laserlab and unfortunately the signal 
was plugged in a second Level Adapter as 
TTL in 
the Messhütte and was "again" converted 
into a NIM for DAQ1/2.

Now the Q-Switch is converted from TTL to 
NIM in the ESR Laserlab. The NIM is 
afterwards guided through a Logic Fan 
In/Out to the 2 DAQs.