Yesterday afternoon, we installed 6 adaptors on the ADC channels 0-5 of the mezzanine S/N 58 of the DAQ box S/N10 (SDB2_DBOX_RightUp). This concerns the DC channels (Sum, H, V) of the two B1p quadrants.

With these adaptors the input gain of the ADC mezzanine is now 0.192 instead of 0.5 as it was before. In order to make this operation transparent we have updated the gains in the SDB2_dbox_bench configuration file (lines 232-237) with a gain equal to 5.2083 instead of 2.

Fig.1 and Fig.2 show the B1p quadrants and photodiode DC signals during a transition to dark fringe that occured before performing this modification. Fig.3 and Fig.4 show the same signals during another transition to dark fringe, this time after the modification of the ADC input gain was performed. As expected  the ratio between the longitudinal photodiode and the quadrants remain the same. As it can be seen on Fig.3 and Fig.4 the "Sum" signal of the quadrants can now go above 10V.