[Halld-pid] Question on FADC250 clipping

[Beni Zihlmann]

Hi Sasha,
for each channel there is a jumper that can be set to 0.5 1.0 and 2.0 Volts.
it is very obvious. The jumper is right next to the input on the PCB.

cheers,
Beni


> Hi Fernando,
>
> In our tests of TOF modules, we have switched now to FADC250
> which you sent to us. Things are mostly looking good, we see
> signal shapes and all ADC controls are working as expected.
> However, we see a lot of signal clipping at 8192 (2^13) ceiling.
> On the scope, the triggered signals are on the order of a few
> hundred mV, with an average of 600 mV. However, more
> than 90% of the ADC shapes are clipped on top. As far as
> I understand, the ADC max is selectable with some
> resistor block to be 0.5V, 1V or 2V. How do I check that
> it is not set to 0.5V in our FADC? Is there any way to check
> this through VME, or do I have to measure those resistors?
> Also, are the pedestals of ~2000 counts (1/4 of the FADC range)
> normal and expected for signals without any visible DC offset?
>
> Sasha
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