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Re: Preamp tests
Hall D Electronics:
We would like to stuff another HV distribution board
so that we can test things with it. Would people like
to comment on which values are reasonable for the
resistor and capacitors on the board? It sounds like the
330pf that Gerard is recomending is a good choice, can
someone send us a pointer where we can order some of
them?
thanks - Curtis
On Thu December 13 2007, Yves Van Haarlem wrote:
> Hall D Electronics:
>
> Hi Gerard,
>
> I asked McCracken how we came to this design: the plan of CMU was to use
> coax cable to bring the signal from the sense wire to the HV board, the
> plan was to connect the cable shield to the HV board ground. There was a
> electronics meeting in Indiana where Paul Smith suggested to connect the
> cable shielding to the HV and not to the ground. Gerard opposed the idea
> of using coax cable. The decision on which capacitors to use came after a
> small calculation done at CMU.
>
> I decided not to connect the cable shielding to ground when bringing the
> HV board outside the CDC end plenum because we saw no difference (using
> the old preAMP) with/without connection.
>
> Plan:
> step 1: I just started (together with Mike) to collect the
> material to connect the cable shielding to the HV line on the HV board.
> After that we will test this.
>
> step 2: Change the capacitors on the board with the ones Gerard
> proposes and test -> Gerard, what type/value do you propose; i remember
> you saying we should also using a different type.
>
> -- My hope is that this can be done in a short period of time and
> that we can take data afterwards --
>
> step 3: first iteration in redisigning the board (shrink it, new
> orientation preAMp, maybe two ground planes, ...)
>
>
> Cheers,
> Yves
>
--
Professor Curtis A. Meyer Department of Physics
Phone: (412) 268-2745 Carnegie Mellon University
Fax: (412) 681-0648 Pittsburgh PA 15213-3890
cmeyer@ernest.phys.cmu.edu http://www.curtismeyer.com/