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 Use of Calculated Characteristics

Use

If you inspect with quantitative inspection characteristics, you can use calculated characteristics if you want the system to calculate inspection results from the inspection results of other inspection characteristics (calculation input characteristics) according to a predefined formula.

Prerequisites

Take the following points into account to ensure that the characteristics can be calculated by the system correctly:

  • Compatibility of characteristics

The calculation input characteristics and the calculation characteristics must, for example, be compatible with regard to the results to be confirmed and the inspection scope.

  • Dynamic modification at characteristic level (optional)

It is advisable to enter a dynamic modification rule in a calculated characteristic or a calculation input characteristic and then to reference the other characteristic for dynamic modification.

Features

Unlike other inspection characteristics, the results of a calculated characteristic are not recorded manually.

In results recording, you process and valuate the calculation input characteristics. The system then uses the predefined formula to calculate the inspection results for the calculated characteristic, based on the inspection results for the calculation input characteristics.

You define this formula in the calculated characteristic, when you enter it in the inspection plan. You can use standard mathematical functions in this formula, as well as the following operands:

  • Numerical constants

  • Formula parameters that reference the values and results of calculation input characteristics.

Calculation input characteristics and calculated characteristics must be contained in the same operation.

  • Formula parameters that call external function modules.

In certain cases, an input value for a calculated characteristic may not be available in the current operation (for example, if you want to use a value contained in another inspection lot). In this case, you can use your own function module to call the necessary data and calculate the input value

Note Note

In Customizing you can find default values for the formula parameters that you can supplement.

End of the note.

Activities

  • Make sure that the Calculated characteristic control indicator is set for the inspection characteristic.

  • On the quantitative data screen, enter the formula. When entering the formula, use the following guidelines:

  • Use the format ppnnnn for the operands and parameters.

The value pp stands for the formula parameter (for example A0). The value pp stands for the number of the task list characteristic (for example, characteristic 0010).

For example, to multiply the value of characteristic 10 (measured value of a single unit) by the value of characteristic 20 (measured value of a single unit), enter the following formula: A00010 * A00020.

  • If the formula parameter references a function module, you can enter a formula parameter without a characteristic number.

  • To select a formula parameter that is defined in Customizing, use the input help for the formula field.

  • You can use the result for the calculated characteristic as a calculation input value for a second calculated characteristic.