Introduction HRDI Calibration Sequences Lamps Lines and Filters Thermodynamic State Filter wheel Position PEAKing algorithm Normalization Constants Dark Counts Absolute Calibration HRDI non linear Etalon movement and wavelength scanning Wavenumber assignments for IPD channel Effects of perfect Anodes Determination of the wavenumber in resonance of any channel Calculation of variance of a spectrum Removal of dead time effect Software Specifications