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    User name jroche

    Log entry time 03:41:59 on November 29, 2010

    Entry number 341895

    This entry is a followup to: 341727

    Followups:

    keyword=Scaler results for the BCM calibration performed on November 24

    Here are the results of the November 24 BCM calibration in term of scaler reading. The results are based on run 8990 and BCM Log 167. The attached plots show the fits of the OLO2 readings (adjusted to the faraday cup readings) to the scaler readings. The extracted coefficients are below: 
    i=0 title=U1  coeff=0.272+/-0.001 const=-0.145+/-0.009 
i=1 title=U3  coeff=0.089+/-0.000 const=-0.053+/-0.002 
i=2 title=U10 coeff=0.059+/-0.000 const=-0.017+/-0.001 
i=3 title=D1  coeff=0.231+/-0.000 const=-0.051+/-0.008 
i=4 title=D3  coeff=0.075+/-0.000 const=-0.019+/-0.002 
i=5 title=D10 coeff=0.024+/-0.000 const=-0.009+/-0.001 


i=0 title=U1  tcl process constant=  3764 offset=   547
i=1 title=U3  tcl process constant= 11480 offset=   605
i=2 title=U10 tcl process constant= 17423 offset=   290
i=3 title=D1  tcl process constant=  4430 offset=   227
i=4 title=D3  tcl process constant= 13625 offset=   265
i=5 title=D10 tcl process constant= 42870 offset=   372
    This calibration confirm yet again that the upstream bcm signals stayed constant between November 5 and November 24, while the downstream bcm signals did change. Here are the ratio of gains: 
    signal  NOV 5   NOV 24  ratio
U1      3795    3764    1.01
U3      11644   11480   1.01
U10     17628   17423   1.01
D1      4083    4430    0.92
D3      12515   13625   0.92
D10     39209   42870   0.91





    Fits of the scaler reading versus OLO2 readings



    Residuals over the whole current range



    Residuals at current less than 10 uA