[Primexd] [Revised Logentry] CCAL(NPS prototype) FADCs switched to 2V range

[somov at jlab.org]

Logentry Text:
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We switched the voltage range of CCAL FADCs (set jumpers on each fadc module) to 2 Vs.
HV for each channel was increased by 55 V. FADC baselines were calibrated according to 
the new fadc settings.

First run with the new  fadc range: 60278
HV configuration file:  COMCAL_HV_Production_jump_55V_increase.snap

We took LED data before and after switching the fadc voltage range. Below is a list of runs:

LED pulser:  500 Hz, 29 V bias voltage 

Each file contains about 100 K events

1 V fadc range, used in December 2018
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Run            HV (V)      Location 
60269            575               data1
60268            600               data4      230 um divider current
60267            625               data3
60266            650               data2      250 um divider current
60265            675               data1
60264            700               data4
60263            725               data3
60262            750               data2
60261            800               data1
60270            850               data4
60271            900               data3     350 um divide current
60272            950               data4

60273       Production (used in December 2018)     data4
60274       Production + 55 V                                   data2
HVs for four channels (-3:3,  -3:4, -3:5, 6:1 ) were not updated in run 60274. 
Correct values were set starting from the run 60278. 

2 V FADC range, new FADC settings
-----------------------------------------------

60278     New voltages (production + 55 V)     data2

Fadc waveforms of all CCAL channels induced by an LED pulser for new HV settings (and 2 V fadc range) are 
shown in Fig. 1.






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