The actual process of calibrating a spectrum is not from here (it is invoked as an option
from the right-click context menu of 1d spectra). The purpose of this menu is to provide
a means to save calibration data to a file (Save Calibration), read back previously
saved calibration data (Read Calibration) and directly make changes in the calibration
file (Edit Calibration). Note that calibration files are to be named *.cal.
Edit Calibration serves as a simple notepad-type editor where calibration constants
can be changed. This is equivalent to editing the calibration file using a text editor.
After making the changes, the new calibration is at once applied by LAMPS
and one can optionally save it later by the Save Calibration command.
Note: A lot of confusion can be avoided by noting that it is ADC's (i.e. parameters) that are calibrated, not 1d-spectra. The difference is that spectrum resolution can be different from ADC resolution. The right-click context menu "Calibration" when invoked from a 1d spectrum takes care of doing the conversion, and similarly when calibrated values are displayed in the spectrum windows, the required conversion factors are applied. But when looking at the coefficients P[0], P[1], P[2], P[3] bear in mind that they apply to channel numbers in terms of the ADC resolution.
The calibration formula is:
E=P[0] + P[1]*x + P[2]*x*x + P[3]*sqrt(x)