Inspecting Absolute Calibration History

The ABSCAL.HIS file is located in the system file directory on the radiometer PC and stores all absolute calibration results. This also includes successful tip curve calibrations of transparent channels. In order to inspect this calibration history, first copy ABSCAL.HIS from the radiometer to the host PC. Then open the Absolute Calibration History menu. Load the previously copied ABSCAL.HIS file with Load History File and the list of calibrations is displayed.
The listed entries are incrementally numbered (preceded by #). The entry syntax is:

#calibration number: Receiver 1 cal. type / Receiver 2 cal. type, (date and time of Rec.1 calibration || date and time of Rec.2  calibration)  

When an entry in the list is marked, Delete Last Entries removes all entries after the marked entry. This feature is useful to remove ‘bad’ calibrations from the list, typically the last calibration. If there is only a single calibration data set stored in the history file and you want to delete it, just delete the complete history file. With Generate a new calibration file ABSCAL.CLB is generated using the calibration numbers specified for receiver 1 and 2. If the modified ABSCAL.CLB file is copied to the system files directory (password protected), the radiometer will load the new calibration parameters from ABSCAL.CLB when 2CH.EXE boots up the next time.
Double clicking on one of the entries opens the Calibration Results menu. For each receiver channel the four parameters G,, Tsys and Tn (see section 4.1.3) are listed. In addition the calibration type, calibration time and physical temperature of calibration targets and the environmental temperature are shown.