2.7. Advice in case of problems

  • If the project runs though without any messages, but the results are not plausible, e.g. the detection limit iteration does not converge:

Then check at first whether the symbols for the net and gross counting rates are correctly selected.

This means also, that always a separate equation must exist which defines the net counting rate.

  • The detection limit iteration also starts working improperly if the relative uncertainty approaches a value of 61 % or even fails in case of more than 61 %. The reason for this behavior originates from ISO 11929 itself.

  • Also, values in the table of the TAB “Values, uncertainties”, which are equal to zero, lead to strange behavior. This may happen after re-editing the equations, where shifts between the lists of symbol names and values may occur. Thus, the latter should be checked for after one would have done significant re-editing of the equations.

  • Symbols which became dispensable after having edited the equations: it is referred to section 4.2 for their removal.

  • Calls to the special UR specific functions LINFIT or KALFIT should always be defined in separate equations; the closing brackets of these calls must not be followed by additional operators or symbols in the same equation.

  • For projects using linear unfolding (e.g., for combined Sr-89/Sr-90-analyes):

Since version 1.08 some modifications were applied to the dialog for defining the model of a decay curve fitting. In the case of problems, it is recommended therefore, to invoke also this dialog directly for checking if selections/options are still the right ones.

  • A simple way in UR for initiating a complete re-calculation of the output values consists in selecting the current out output quantity again in the menu Edit - Output quantity.

  • The toolbar icon view-refresh initiates a complete re-calculation of characteristic values after having made changes to the model or the input data. If the program halts at the TAB “Values, Uncertainties”, press the view-refresh icon once more.

  • Editing cells in tables:

one click into the cell row marks the row, the second click opens the cell for editing. An entry into a cell must be confirmed with the ENTER key; the TAB key is not sufficient.

  • Paste the Windows Clipboard into a table cell:

    Note that paste with the short-cut CTRL-V only works for the first time, but no longer thereafter;

    Thereafter, this works only correctly, after having marked the cell, by using the paste option from the associated context menu;

  • To optimize the column widths is possible by double-clicking the small vertical line between two column heads; the mouse pointer changes its shape shortly before double-clicking.

  • For importing column blocks from Excel or from Notepad++ into columns of a UR2 table: see the end of Section 5.7.

  • Using the menu item Edit – Load missing values from project variant, values and uncertainties still missing in the actual project can be imported from another file variant of the project.