Last week, the HEPI actuators were driven after reattaching them to the boots. Few tests were performed:

- Linearity test (LHO_HPI_BSC8_Linearity_test_20120504T163242.fig)

- Range of motion (make sure there is 0.8mm amplitude)

- Transfer functions (10mHz-100mHz and 10Hz-500Hz) and comparisons with measurements before detaching the actuators (ISI unloaded for QUAD repairs). The comparison shows no/minor changes in the plant.

Note that the 100mHz and 10Hz points are linked.

https://svn.ligo.caltech.edu/svn/seismic/HEPI/H2/ITMY/Data/Figures/Transfer_Functions/Comparisons/L2L/

• LHO_ISI_BSC8_Comparison_TF_L2L_ACT_H_to_IPS_H_20120216_vs_20120507.fig
• LHO_ISI_BSC8_Comparison_TF_L2L_ACT_H_to_L4C_H_20120216_vs_20120507.fig
• LHO_ISI_BSC8_Comparison_TF_L2L_ACT_V_to_IPS_V_20120216_vs_20120507.fig
• LHO_ISI_BSC8_Comparison_TF_L2L_ACT_V_to_L4C_V_20120216_vs_20120507.fig