[Halld-tracking-hw] ADC125 as a TDC...

[Gerard Visser]

Hi Lubomir,
	I think you checked it before when this was first discovered, but let me ask 
again because I don't recall it really: If you swap cables at the ADC board, the 
timing basically follows the cable? So it is not that the ADC board has a large 
time offset between channels? That would be highly unexpected but I guess not 
impossible, so it would be good to make this check.
	Similarly swapping cables at the preamp board would rule out the cable as the 
source of the delay discrepancy...?
	If the above is all true, have you tried more than just the two preamp boards? 
Maybe one of them is simply broken?
	Sincerely,

		Gerard

On 5/17/2011 12:43 PM, Lubomir Pentchev wrote:
>
> Beni,
>
> You can also look at the time difference between the top and bottom
> strips, compare it with what you have, "t_wire - t_strip", and then you
> can extract the wire resolution alone.
>
> I also don't understand the reason for the big time shift between the two
> preamp cards, and for the time variations within the cards.
>
> Lubomir