Re: Electronics Readout Characteristics

[Gerard Visser <gvisser@indiana.edu>]

Hi again Fernando,
	I just noticed that the document linked below also had an (unstated) 
measurement of effective gain of the shaper by basically the same method 
you followed. See the 2 figures on page 3, 10%-100% pulse amplitude at 
input of shaper was 176 mV and at output was 382 mV. [The input was 
probed with a high impedance differential probe (Tek P6247), with the 
shaper terminating the cable as usual.]
	So the effective gain was 2.17, in excellent agreement with your result.
	I didn't write down which exact board I did this too, but it is highly 
probable that this was done on the board which is now in Yves' possession.

	Gerard


Gerard Visser wrote:
> Hi Fernando,
>         Sorry I didn't write back earlier... I attach here below your other
> email and a combined reply, thanks!
> 
> Hi Fernando,
>         The CDC and the FDC anode shapers should be identical. You have
> implemented exactly the changes listed on page 5 of
> http://argus.phys.uregina.ca/gluex/DocDB/0007/000736/003/Receiver_Shaper_Setup_for_GPC01.pdf
...

> Fernando J. Barbosa wrote:
>  > Hi Gerard,
>  >
>  > I know you are busy with the fADC but I just want to check some info
>  > with you.
>  >
>  > We have measured the gains for the shapers and are as follows: FDC
>  > anode=2.16, FDC cathode=10.42 and CDC anode=3.2. The first two
...