Re: oscillations

[Gerard Visser <gvisser@indiana.edu>]

Hall D Electronics:

Hi Yves,
	Ok thanks for clarifying that. Do you remember also, was the scope then 
set for high-Z or 50 Ohm input? This could make a big difference in 
provoking the oscillations. Let us know, if you remember it. Thanks,

	Gerard

Yves Van Haarlem wrote:
> Hi All,
> 
> Just to answer Gerard's question:
> 
>> 2. We put on the new preamp and I asked Yves to connect as before.
>> Oscillations were observed. Here are the details of the connection: The
>> signal cable was ~3m, ERNI connector on one end, the other end broken out to
>> 100 (?) Ohm termination resistors on pair #1, 2-9, and 18-25. Pairs 10-17
>> were not terminated. (They are also open on the preamp board  end of the
>> cable, since no ASIC or termination resistor is there.) For one of the
>> channels (at a time, we looked at a few) the 100 Ohm resistor termination was
>> removed (Yves, is that right, or did we leave it?) and in it's place two
> 
> We left the 100 Ohm termination resistor in.
> 
> Cheers,
>         Yves