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[Xu Sun <sunxuhit AT gmail.com>]

Hi Gerard,

>       Are there any misbehaving ARM boards or other things that I need to 
> look into?

We were trying to identify the issues of ARM and ABC board. The
default setup is ARM C1 => ABC C1 and ARM C2 => ABC C2.
The ARM C2 and ABC C2 are working properly and we planed to swap ABC
C1 and ABC C2 (ARM C1 => ABC C2 & ARM C2 => ABC C1) to identify the
issue. If ARM C1 => ABC C2 gives the correct output then we know ABC
C1 is problematic and visa versa.

I stoped to do that check after I had a look of ABC board (a photo of
ABC board is in the attachment). It seems like there is not an easy
way to swap ABC C1 and ABC C2, since if I flip the board it will not
be plugged in.
And my conclusion is we could not identify the readout problem unless
we have a known working ABC board or ARM.

Hope this explain the situation. If you have any suggestions please let me 
know.

Best,

Xu

On Tue, Jan 21, 2020 at 1:03 PM Ye, Zhenyu <yezhenyu AT uic.edu> wrote:
>
> Hi Gerard,
>
> > On Jan 21, 2020, at 12:58 PM, Gerard Visser <gvisser AT indiana.edu> wrote:
> >
> > Hi Zhenyu,
> >       Sounds quite fine. As usual be sure that the pulse width feeding to 
> > the ARC-II trigger input is a few hundred ns at least. Of course that 
> > should be no problem.
> >       It's probably easiest for you guys in general to leave the readout 
> > system latency set correctly for cosmics, and for laser data use another 
> > gate/delay generator to get a trigger pulse for the readout with a 
> > latency that matches your cosmics trigger. Although of course it is ok to 
> > change the latency settings for the APV instead.
>
> Thanks for the tip. We will look into these options to see which one works 
> easiest for us.
>
> >       Are there any misbehaving ARM boards or other things that I need to 
> > look into?
>
> I shall let Xu to comment on this.
>
> Zhenyu
>
> >       Sincerely,
> >
> >               Gerard
> >
> >
> > On 1/21/2020 1:53 PM, Ye, Zhenyu wrote:
> >> Hi Gerard,
> >>> On Jan 21, 2020, at 12:00 PM, Gerard Visser <gvisser AT indiana.edu> wrote:
> >>>
> >>> hi Andres, Zhenyu,
> >>>     Sorry I missed the meeting yesterday. But I looked over the nice 
> >>> slides on the test system now at least.
> >>>     If there are problems or apparent problems with the readout please 
> >>> write me with details, I will try to help sort that out. I gather you 
> >>> were still to swap the ABC boards or ARM boards to see if some problem 
> >>> followed the one or other. The ABC boards are just connector boards; 
> >>> but there are fuses there which could be blown.
> >>>     About the laser: This is pulsed laser I presume. What is the pulse 
> >>> width
> >> The gain-switched operation of the semiconductor laser diode allows 
> >> emission of optical pulses from 45 ps to 110 ps
> >>> and rep rate,
> >>      • Continuously tunable repetition rate from pulse-on-demand to 40 
> >> MHz
> >>> and how do you trigger the readout in sync with the laser pulse?
> >> We will send a signal simultaneously to trigger the laser and to IST/FST 
> >> readout system. We will need to tune the latency.
> >> Zhenyu
> >>>     Sincerely,
> >>>
> >>>             Gerard
> >>>
> >>>
> >>> On 1/21/2020 12:28 PM, Ye, Zhenyu wrote:
> >>>> Minutes:
> >>> ...
> >>>> 4. UIC Test stand - Xu/Andres
> >>>> Presented design for cosmic ray  and laser test stands.
> >>>> Requested to have a few extra parts from BNL. Flemming will check with 
> >>>> Mike and provide them
> >>>
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