J. Kissel, F. Clara, R. McCarthy, R. Abbott, S. Aston

After discovering (last night) that the H1 OMCS transfer functions revealed an excess DC gain of 5.5, Stuart, Richard, and Filiberto identified that an incorrect breed of TOP driver for the OMCS, which was a result of an incorrect wiring diagram. Fil has now swapped in the correct driver, and I've taken transfer functions. I've finished taking all Phase 2b measurements, but not yet processed them all (aLOG to come); I post the raw transfer function data here which has the comparison to the previous measurement (and shows the coherence), just to prove the point and demonstrate victory.


Of interesting note -- the OMCS TOP Driver (D1100304) has a lower transconductance, 2.026 [mA/V], that a Triple Top Driver (D1001242), 11.919 [mA/V]. Therefore, the "incorrect", Triple Top set of transfer functions have better SNR / coherence than the "correct" OMC TOP transfer functions. Who thought hard enough about the OMCS that they calculated the DAC / coil driver noise, which then convinced them to create a whole new, annoyingly different, driver type? I certainly have not seen any such design discussion. R Abbott hasn't either. This applies for the TMTS as well, which also has its own TOP driver. Hurumph.