Hi,
regarding the "Cal file checksum incorrect. File reset to default values." error message, the assembly level repair manual states:
"This message occurs at powerup when downloading of calibration data is unsuccessful. It indicates that the calibration data is corrupt, and although the Test Set will function, measurements will be inaccurate. Calibration data is downloaded from a memory card when certain assemblies are replaced, or it is generated when the Periodic Calibration program is run. This message will not occur again at powerup unless another unsuccessful downloading occurs."
I would assume that unless you have backups of the calibration data from all relevant assemblies, it will be difficult to restore the unit to full working order (i.e. make it operate within its accuracy specifications). I am not sure whether sending the unit to a calibration lab is a possible fix and whether it covers all lost calibration data. From my understanding, there are certain coefficients in the calibration data that are generated by the manufacturer of the respective module (e.g. spectrum analyzer).
Regards,
Oliver
