J. Kissel

Channels already in longitudinal or translation displacement units (in this case IFO X or suspension point longitudinal)
    H1:ISI-HAM2_BLND_CPSX_IN1_DQ      HAM2 X displacement, capacitive position sensor, pre-blend
    H1:ISI-HAM3_BLND_CPSX_IN1_DQ      HAM3 X displacement, capacitive position sensor, pre-blend

    H1:ISI-HAM2_ISO_X_IN1_DQ          HAM2 X displacement, post-blend combined sum on CPS and GS13, feedback loop error signal, contains feedback loop suppression
    H1:ISI-HAM3_ISO_X_IN1_DQ          HAM3 X displacement, post-blend combined sum on CPS and GS13, feedback loop error signal, contains feedback loop suppression

    H1:ISI-DIFF_H2_BLND_SS_X_DQ       HAM2 X displacement, post-blend combined sum of CPS and GS13, out-of-loop
    H1:ISI-DIFF_H3_BLND_SS_X_DQ       HAM3 X displacement, post-blend combined sum of CPS and GS13, out-of-loop

    H1:ISI-HAM2_ISO_X_EXC             HAM2 X excitation, in same units as ISO_X_IN1_DQ error signal, and thus displacement (rather than the usual "counts")
    H1:ISI-HAM3_ISO_X_EXC             HAM3 X excitation, in same units as ISO_X_IN1_DQ error signal, and thus displacement (rather than the usual "counts")

    H1:HAM2-SUSPOINT_MC1_EUL_L_DQ     HAM2 GS13s projected for MC1 suspension point and calibrated into L displacement (linear combo of X, Y, RX, RY, and RZ)
    H1:HAM2-SUSPOINT_MC3_EUL_L_DQ     HAM2 GS13s projected for MC3 suspension point and calibrated into L displacement (linear combo of X, Y, RX, RY, and RZ)
    H1:HAM2-SUSPOINT_PRM_EUL_L_DQ     HAM2 GS13s projected for PRM suspension point and calibrated into L displacement (almost entirely X, RY, and some RZ)
    H1:HAM2-SUSPOINT_PR3_EUL_L_DQ     HAM2 GS13s projected for PR3 suspension point and calibrated into L displacement (almost entirely X, RY, and a little RZ)
    H1:HAM3-SUSPOINT_MC2_EUL_L_DQ     HAM2 GS13s projected for MC2 suspension point and calibrated into L displacement (almost entirely X, RY, and some RZ)
    H1:HAM3-SUSPOINT_PR2_EUL_L_DQ     HAM2 GS13s projected for PR2 suspension point and calibrated into L displacement (almost entirely X, RY, and some RZ)

    H1:ISI-DIFF_H23_SS_X_OUT_DQ       (HAM3 - HAM2) differential displacement (one-way distance between H3 and H2)

    H1:SPI-H23_DIFFDISP_MAIN_OUT_DQ   (HAM3 - HAM2) differential displacement (has been converted into one-way distance between H3 and H2)

    To convert to [m] of displacement from these channels which have front-end calibrated units of [nm]:
        DTT Units: [m]
        DTT Calibration: 
            - Gain :: 1e-9 [m/nm]
            - {z:p} :: {(none),(none)}

Channels already in rotational displacement units (in this case IFO RY or RZ or suspension point PIT or YAW)
    PITCH / RY
        H1:ISI-HAM2_BLND_CPSRY_IN1_DQ      HAM2 RY displacement, capacitive position sensor, pre-blend
        H1:ISI-HAM3_BLND_CPSRY_IN1_DQ      HAM3 RY displacement, capacitive position sensor, pre-blend

        H1:ISI-HAM3_BLND_CRSRY_IN1_DQ      HAM3 RY displacement, cylindrical rotation sensor, pre-blend (HAM3 only)

        H1:ISI-DIFF_H2_BLND_SS_RY_DQ       HAM2 RY displacement, post-blend combined sum of CPS and GS13, out-of-loop
        H1:ISI-DIFF_H3_BLND_SS_RY_DQ       HAM3 RY displacement, post-blend combined sum of CPS and GS13, out-of-loop

        H1:ISI-HAM2_ISO_RY_IN1_DQ          HAM2 RY displacement, post-blend combined sum on CPS and GS13, feedback loop error signal, contains feedback loop suppression
        H1:ISI-HAM3_ISO_RY_IN1_DQ          HAM3 RY displacement, post-blend combined sum on CPS and GS13, feedback loop error signal, contains feedback loop suppression

        H1:ISI-HAM2_ISO_RY_EXC             HAM2 RY excitation, in same units as ISO_RY_IN1_DQ error signal, and thus displacement (rather than the usual "counts")
        H1:ISI-HAM3_ISO_RY_EXC             HAM3 RY excitation, in same units as ISO_RY_IN1_DQ error signal, and thus displacement (rather than the usual "counts")

        H1:HAM2-SUSPOINT_MC1_EUL_P_DQ     HAM2 GS13s projected for MC1 suspension point and calibrated into P displacement (linear combination of IFO RX and RY)
        H1:HAM2-SUSPOINT_MC3_EUL_P_DQ     HAM2 GS13s projected for MC3 suspension point and calibrated into P displacement (linear combination of IFO RX and RY)
        H1:HAM2-SUSPOINT_PRM_EUL_P_DQ     HAM2 GS13s projected for PRM suspension point and calibrated into P displacement (almost entirely RY)
        H1:HAM2-SUSPOINT_PR3_EUL_P_DQ     HAM2 GS13s projected for PR3 suspension point and calibrated into P displacement (almost entirely RY)
        H1:HAM3-SUSPOINT_MC2_EUL_P_DQ     HAM2 GS13s projected for MC2 suspension point and calibrated into P displacement (almost entirely RY)
        H1:HAM3-SUSPOINT_PR2_EUL_P_DQ     HAM2 GS13s projected for PR2 suspension point and calibrated into P displacement (almost entirely RY)

        H1:SPI-H23_OL_ISI_J_PIT_OUT_DQ    HAM2 PIT rotation
        H1:SPI-H23_OL_ISI_K_PIT_OUT_DQ    HAM3 PIT rotation

    YAW / RZ
        H1:ISI-HAM2_BLND_CPSRZ_IN1_DQ      HAM2 RY displacement, capacitive position sensor, pre-blend
        H1:ISI-HAM3_BLND_CPSRZ_IN1_DQ      HAM3 RY displacement, capacitive position sensor, pre-blend

        H1:ISI-DIFF_H2_BLND_SS_RZ_DQ       HAM2 RY displacement, post-blend combined sum of CPS and GS13, out-of-loop
        H1:ISI-DIFF_H3_BLND_SS_RZ_DQ       HAM3 RY displacement, post-blend combined sum of CPS and GS13, out-of-loop

        H1:ISI-HAM2_ISO_RZ_IN1_DQ          HAM2 RY displacement, post-blend combined sum on CPS and GS13, feedback loop error signal, contains feedback loop suppression
        H1:ISI-HAM3_ISO_RZ_IN1_DQ          HAM3 RY displacement, post-blend combined sum on CPS and GS13, feedback loop error signal, contains feedback loop suppression

        H1:ISI-HAM2_ISO_RZ_EXC             HAM2 RY excitation, in same units as ISO_RY_IN1_DQ error signal, and thus displacement (rather than the usual "counts")
        H1:ISI-HAM3_ISO_RZ_EXC             HAM3 RY excitation, in same units as ISO_RY_IN1_DQ error signal, and thus displacement (rather than the usual "counts")

        H1:HAM2-SUSPOINT_MC1_EUL_Y_DQ     HAM2 GS13s projected for MC1 suspension point and calibrated into P displacement (linear combination of IFO RX and RY)
        H1:HAM2-SUSPOINT_MC3_EUL_Y_DQ     HAM2 GS13s projected for MC3 suspension point and calibrated into P displacement (linear combination of IFO RX and RY)
        H1:HAM2-SUSPOINT_PRM_EUL_Y_DQ     HAM2 GS13s projected for PRM suspension point and calibrated into P displacement (almost entirely RY)
        H1:HAM2-SUSPOINT_PR3_EUL_Y_DQ     HAM2 GS13s projected for PR3 suspension point and calibrated into P displacement (almost entirely RY)
        H1:HAM3-SUSPOINT_MC2_EUL_Y_DQ     HAM2 GS13s projected for MC2 suspension point and calibrated into P displacement (almost entirely RY)
        H1:HAM3-SUSPOINT_PR2_EUL_Y_DQ     HAM2 GS13s projected for PR2 suspension point and calibrated into P displacement (almost entirely RY)

        H1:SPI-H23_OL_ISI_J_YAW_OUT_DQ    HAM2 PIT rotation
        H1:SPI-H23_OL_ISI_K_YAW_OUT_DQ    HAM3 PIT rotation

    To convert to [rad] of rotational displacement from these channels which have front-end calibrated units of [nrad]:
        DTT Units: [rad]
        DTT Calibration: 
            - Gain :: 1e-9 [rad/nrad]
            - {z:p} :: {(none),(none)}


Inertial sensor channels in translational velocity units, that need more than just a scale factor:
    X Translation Displacement
       H1:ISI-HAM2_BLND_GS13X_IN1_DQ      HAM2 X displacement, GS13 inertial sensor, pre-blend
       H1:ISI-HAM3_BLND_GS13X_IN1_DQ      HAM3 X displacement, GS13 inertial sensor, pre-blend

    To convert to [m] of translational displacement from these channels which have front-end calibrated units of "inertial sensor response, which asymptotes to 1 [nm/s]":
        DTT Units: [m]
        DTT Calibration: 
            - Gain :: 1e-9 [(m/s)/(nm/s)]
            - {z:p} :: {(0.707 0.707),(0 , 0)} (note the space separation for the zeros -- representing a complex pair of zeros at 1 Hz, 45 [deg] apart -- and the comma separation for the poles.)

        Important :: In the UNITS tab of the plot display, chose "rad/Hz^{1/2}" which integrates from velocity into displacement. This needs to be checked/done frequency as DTT resets the units every time you remeasure or make a change to the plots.


Inertial sensor channels in rotational velocity units, that need more than just a scale factor:

    RY Rotation Displacement
       H1:ISI-HAM2_BLND_GS13RY_IN1_DQ      HAM2 RY displacement, GS13 inertial sensor, pre-blend
       H1:ISI-HAM3_BLND_GS13RY_IN1_DQ      HAM3 RY displacement, GS13 inertial sensor, pre-blend
    
    RZ Rotation Displacement
       H1:ISI-HAM2_BLND_GS13RZ_IN1_DQ      HAM2 RY displacement, GS13 inertial sensor, pre-blend
       H1:ISI-HAM3_BLND_GS13RZ_IN1_DQ      HAM3 RY displacement, GS13 inertial sensor, pre-blend

    To convert to [rad] of rotational displacement from these channels which have front-end calibrated units "inertial sensor response, which asymptotes to 1 [nrad/s]":
        DTT Units: [rad]
        DTT Calibration: 
            - Gain :: 1e-9 [(rad/s)/(rad/s)]
            - {z:p} :: {(0.707 0.707),(0 , 0)} (note the space separation for the zeros -- representing a complex pair of zeros at 1 Hz, 45 [deg] apart -- and the comma separation for the poles.)

        Important :: In the UNITS tab of the plot display, chose "rad/Hz^{1/2}" which integrates from velocity into displacement. This needs to be checked/done frequency as DTT resets the units every time you remeasure or make a change to the plots.

Note, you could do the integration in the calibration interface (rather than forcing DTT to do it) by adding a third pole at 0 Hz in the {z:p} list, and changing the Gain to 1e-9/(2*pi) = 1.59e-10.