pVPD Dual Range ADC results

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From: W.J. Llope (llope_at_physics.rice.edu)
Date: Wed Jan 22 2003 - 16:42:02 EST

hello - just some new results from the localmon data...

the correlation between the high and low range
pVPD ADC values for a given channel is very tight. this
makes the rationalization of these two scales very easy...

see the attached for (LR_adc-pedestal) in blue and
(HR_adc-pedestal)/slope in magenta for pvpd ch 0,
where "slope" is the scale factor extracted extremely
accurately from fits of HR vs LR in single chs...
after pedestal subtraction and scaling the HR ADC
for the attenuation the resulting adc dustributions match
up very well in shape i'd say....

one puzzle at the moment (at least in my mind) is
that these scale factors are only a factor of ~2.4, while
the attenuators in front of the HR ADCs are 8 dB...
i.e. i would have thought the HR ADCs would be more attenuated
by more like a factor of 6.... comments?

regards,
        bill 

-- 

  W.J. Llope, Ph.D.                      Res. Assoc. Professor
  T.W. Bonner Nuclear Laboratory         phone:  713-348-4741
  Rice University, MS-315                fax:    713-348-5215
  6100 S. Main St.
  Houston, TX 77005-1892
             e-mail:     llope_at_physics.rice.edu
             WWW home:   http://wjllope.rice.edu/default.html

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