Designating a proper nonlinearity curve as a default
After a successfully construction of a nonlinearity curve, you should take one last admi­nistrative step: HyperLab should know that this curve is to be used as a default one. This can be done by assigning the nonlinearity analysis to the measurement setup where it belongs.
After this step, the spectrum files, which loaded next time, may get this nonlinearity correction automatically, so your energy calibrations will be more precise right after the importing.
Open Measuring environment node in your database browser tree, then Setups and their assignments, finally the measurement setup where your nonlinearity curve is created. In our example, the masurement setup 'D4 Setup 70keV - 3.3Mev, d=25cm' was opened. After that entry, click System nonlinearity calibrations assigned to this setup, and then select the task at the right named 'New Meas. Setup – nonlinearity assignment'.
A data entry window appears now.
Now you should select the nonlinearity analysis you have created.
Another important field is the Valid from entry, where you can define the starting date when your nonlinearity analysis should be used as a default.
Set it to the date of the measurements which have been used for the analysis.
In our example, we set this date to January 1st, 2002, to make sure that it will be automatically used for all measurements taken from the very first day of that year.
You should always register a successfully created analysis as default. This way a chain of nonlinearity analyzes will be created, each representing a time range of your measurement system, when that calibration was valid.
On this picture we depict a situation, when 4 nonlinearity analysis, NL1, … NL4 is determinedfor a measurement setup. After the first assignment (NL1), there is always a valid nonlinearity in the system. For example, if a spectrum file is imported, where the acquisition time is between the 2nd and the 3rd nonlinearity analysis, then the NL2 nonlinearity will be assigned to the energy calibration of that measurement during the importing.
 
 
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