PEDESTALS ========= Pedestals for gain0 with separate power: ch-all-chip65-ped-seppreamp0gain0shaper0decay0.5.pdf Pedestals for gain0 with connected power: ch-all-chip65-ped-conpreamp0gain0shaper0decay0.5.pdf Pedestals for gain3 with separate power: ch-all-chip65-ped-seppreamp0gain3shaper0decay0.5.pdf Pedestals for gain3 with connected power: ch-all-chip65-ped-conpreamp0gain3shaper0decay0.5.pdf From these plots are the mean and rms taken. The difference between mean and rms (connectd - separate power) gain 0: chip65-ped-Connected-separate-power-gain0.pdf The difference between mean and rms (connectd - separate power) gain 3: chip65-ped-Connected-separate-power-gain3.pdf Comment: Pedestals are somewhat larger ( a few ADC units) for connected configuration. Could be due to the voltage drop when current increases over resistor at regulator. RMS is within +- 0.3 ADC units. PEDESTAL SUBTRACTION AND ZERO SUPPRESSION ========================================= A sawtooth 2.1V pulse was injected on the trace over the PCA16 inputs on mcm from a AFG3102C generator. The pulse was set to symmetry=99%, i.e. the fall time is not the fastest. This was to avoid overshoot, and to get a longer rise time of the pulse. NOTE: channel 15 data is not used (set to 0) in these data since it was needed not to do zerosuppression on the this channel to prevent system hangup. The max adc values were plotted, +- 4*rms around the peak: Connected configuration: ch-all-chip65-maxph-zerosup-peakconzerosuppreamp0gain0shaper0decay05.pdf Separate configuration: ch-all-chip65-maxph-zerosup-peaksepzerosuppreamp0gain0shaper0decay05.pdf From these plots are the mean and rms taken. The difference between mean and rms (connectd - separate power) gain 0: chip65-Connected-separate-power-zskip.pdf Comments: Difference in max adc value is +- 1.0 ADC unit. Difference in rms is +0.5 -1.5 ADC units. The max adc value varies between 657 and 761 ADC units. WHY? Other plots: with a wider window (0-1024 ADC units) for calculating mean rms, connected configuration: ch-all-chip65-maxph-zerosup-conzerosuppreamp0gain0shaper0decay05.pdf with a wider window (0-1024 ADC units) for calculating mean rms, separate configuration: ch-all-chip65-maxph-zerosup-sepzerosuppreamp0gain0shaper0decay05.pdf From similar plots but with smaller window (600-800 ADC units) are the mean and rms taken. The difference between mean and rms (connectd - separate power) gain 0: chip65-ped-zsup-Connected-separate-gain3.pdf Comments: Channel 7 has in this case a difference of 8 ADC units. COMMENTS ======== Chip65 is used. It has in channel 2 the even-odd problem. Should test with a few fully functioning chips(?). We can only test with shaper disabled. What else to plot?