Re: more on pVPD Dual Range ADC

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From: W.J. Llope (llope_at_physics.rice.edu)
Date: Thu Jan 23 2003 - 13:21:10 EST

At 12:25 PM -0500 1/23/03, John Mitchell wrote:
>Bill,
>My last message should have read "no problem in adding attenuation
>if we need more range." Looking at your plots, it is clear that we
>do need to extend the dynamic range. There are plenty of counts at
>the upper end of the low gain spectrum with the factor of 2.5.

your right and wrong (but you couldn't have known) - for the channel
i showed there is indeed some counts in the OF bin on the high range...
but at the moment we're not running at the right gains either. the pvpd
channel i showed has been running at 2000V, and the desired
setpoint for that guy is actually only 1800V...

STILL we are having troubles getting the pVPD default demand voltages
defined as they were last year. geary has been patiently
working w/ the TRG people on this - he mentioned he's going to
get back on this after lunch today...

anyway, once we're at the right gains, i'll then take
another look at the HR adcs - my guess they'll be o.k....

(but i am still looking for 20dB attenuators too)...

hasta 

-- 

  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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