Fil, Oli

Fil went ahead and did another modification to the BBSS M1 QOSEM satamp. This is the same modification that LLO had done (LLO:82137) - on each of the six boards, resistors R902, R1002, R1102, R903, R1003, and R1103 were swapped from 499kOhm to 22kOhm resistors.

Before the modification the satamp whitening was zpk([0.0144],[2.89],1), with compensation filter zpk([2.89],[0.0144],1). Changing these resistors has shifted the whitening zero up in frequency so the satamp whitening is now zpk([0.263],[2.89],1), with the new compensation filter zpk([2.89],[0.263],1). I have updated the whitening compensation filters ( BS_M1_OSEMINF_{F1,F2,F3,LF,RT,SD}_{SUM,X_RAW,Y_RAW} ) in OSEMINF to these new compensation filters.

Before we brought the BBSS back up we noticed that the SUM counts for F1 were railed, and that the SUMs for all other osems were between 18-20k counts. This is with the sum feedback on. When we turned the sum feedback off and just sent a constant current to the LEDs, F1 was still railed, but the other osems all jumped to normal varying SUM values that we had seen months ago prior to turning the sum feedback on - F3 and RT were staturating (like they had been doing back then), and the others were around 30k counts. Switching back to the sum feedback mode, we have been seeing the SUM counts all (except F1) climbing up slowly, and will hopefully stop in their nominal feedback on locations. We aren't sure why F1 is showing the counts as saturated though while in sum feedback mode - it hadn't been saturated before, and either way, turning on sum feedback mode should lower the current to the LED to lower the counts to a reasonable level (between 29k and 30k counts).