Fluke Biomedical Ansur QA-ES plug-in Version 1.4.4 - Manual (Page 10)

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Use the Operand menu to select how Ansur shall calculate the limit given according to the power values defined
in the test details. The operand can be set to:
• Y – absolute value,
• X + Y – limit calculated as defined power value + specified limit, or
• X + (X * Y%) – limit calculated as a percentage deviance from the defined power value.
So for the example below, each power performance measurement must be +/-20 W of its defined power value.