[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

HVB feedback



Hi Fernando,

I just started to test the new prototype and noticed a few things:

The mapping on the board is reversed after the shaper board: so channel 1 
ends up in channel 16, 2 becomes 15, ...

Channel 3-4 on the HVB do not work and have a baseline offset of 768 mV 
compared to the working channels that have an offset of 200 mV. This 
offset occurs as soon as you connect the preamp to the board. It does not 
matter if the HVB is connected to the prototype or not. I measured the HV 
board but could not find anything suspicious. I also tried the other 
HVB and it showed the same behavior. I am doing a measurement with the 
fe-55 source now but tomorrow I can compare with the old setup and see if 
I see the same there.

Best regards,
 	Yves



                           /--------------------------------
                          /   Yves Van Haarlem
        _--~~--_         /
      /~/_|  |_\~\      /      Carnegie Mellon University
     |____________|    /        Department of Physics
     |[][][][][][]|:= /          Wean Hall room 8404
   __| __         |__ \       	 Pittsburgh, PA 15213
  |  ||. |   ==   |  | \           USA
(|  ||__|   ==   |  |) \
  |  |[] []  ==   |  |   \   	    Tel.:   +1 412 268-6949
  |  |____________|  |    \                  +1 412 641-9252
  /__\            /__\     \	      Fax.: +1 412 681-0648
   ~~              ~~       \-----------------------------------