[Halld-pid] [New Logentry] TOF PMT TDC response

[Fernando J Barbosa]

Hi Sasha,

Correct, there should be no reflections from cables, splitters, fADC250s 
and Discriminators. If I knew of this earlier, I could have tested all 
of the TOF channels during the last few months of down time. However, 
this is relatively simple to test once you provide me with a list of 
channels and I will check them once the hall is open for a period of time.

Best regards,
Fernando


On 3/9/2015 7:25 PM, Alexander Ostrovidov wrote:
> On Monday, March 09, 2015, Fernando J Barbosa wrote:
>> Hi Sasha, Beni,
>>
>> I took some measurements on a spare splitter which is well matched to
>> the coax cables and there are no reflections. Reflections are possible
>> if the devices (fADC250, Discriminator, Splitter) have been incorrectly
>> assembled.
>>
> Thanks, Fernando.So, there were no reflections in your test setup.
> But reflections of the actual TOF pulses are real. They are seem on the
> scope, in fADC pulse shape, in TDC double hits. Something is causing
> them. I guess the only way to resolve this puzzle is to look at the actual
> TOF pulses in the hall.
>
> Sasha
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