[Halld-tracking-hw] Tracking Meting Tomorrow

[Fernando J. Barbosa]

Hi Gerard,

The preamp you have is set for a gain of 3.2 mV/fC and a dynamic range 
of 110 fC (@ 5% linearity), quite different from the CDC. This is the 
fifth row in the Table 2 of GlueX-doc-1364 (the CDC is set as per the 
second row - 0.57 mV/fC, DR=380 fC).

I attach the preamp configuration settings showing where the resistors 
are to be installed. To set your preamp to the CDC configuration, move 
the resistor to the left of the RC label to the pads on the right (5.1 
Ohm resistor sets RC to logic 1) and move the resistor to the left of 
the HG label to the pads on the left (5.1 Ohm resistor sets HG to logic 0).

The FDC cathode setting is the sixth row in Table 2 (2.6 mV/fC gain). 
Let me know if this works for you as this changes are easy to make with 
a soldering iron. If not, I will send you another preamp(s).

There is GlueX-doc-1570 showing the dynamic range with the HVB and shows 
good linearity.

Best regards,
Fernando




Gerard Visser wrote:


> the preamp strapping picture (for current discussion)
> http://npvm.ceem.indiana.edu/~gvisser/GlueX/straps.jpg
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