[Halld-pid] Question on FADC250 clipping

[Alexander Ostrovidov]

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