A complete set of M1-M1 transfer functions had already previously been taken for MC2 (HSTS), with damping loops OFF (see LHO aLog entry 3108).

Another complete set of transfer functions has now been taken, but this time with damping loops ON (n.b. using the same damping loop parameters as determined for LLO HSTS's, see LLO aLog entry 2705).

Both the un-damped and damped MC2 M1-M1 transfer functions have been plotted and compared to the equivalent LLO MC2 suspension, during the same phase of testing (allhstss_2012-06-15_AllHSTS_ALL_ZOOMED_TFs.pdf).

Plot Key:-
Blue trace = Model
Orange trace = MC2 Phase 1b at LLO test-stand with damping loops OFF
Black trace = MC2 Phase 1b at LHO test-stand with damping loops OFF
Pink trace = MC2 Phase 1b at LHO test-stand with damping loops ON

Power spectra have been taken with damping loops both ON and OFF for each stage (2012-06-15_2000_X1SUSMC2_M*_ALL_Spectra.pdf ).

Power spectra data, with both damping ON and OFF have been taken, which compare all phases of MC2 measurements (allhstss_2012-06-16_ALL_Spectra_Don.pdf and allhstss_2012-06-16_ALL_Spectra_Doff.pdf).  

In addition, power spectra for specific degrees of freedom (L, P and Y) can be more conveniently compared across multiple stages (M1, M2 and M3) of the same suspension in the final plots found below (allhstss_2012-06-16_X1SUSMC2_M1M2M3_Spectra_ALL_Don.pdf).

Finally, all data, plots and scripts have been committed to the SUS svn as of this entry.

This should now be sufficient to complete Phase 1b testing of the MC2 suspension.