Non-linearity testing is a method to evaluate the integrity of a resistive element. It may be applied as an effective inline screening method suitable to detect and eliminate potential infant mortality failures in passive components. The method is fairly rapid@ convenient@ and the associated equipment is relatively inexpensive. Typical effects causing non-linearity on resistors are e.g. inhomogeneous spots within a resistive film@ traces of film left in the spiraling grooves@ or contact instability between a connecting lead or termination and the resistive element. This International Standard specifies a method of measurement and associated test conditions to assess the magnitude of non-linear distortion generated in a resistor. This method is applied if prescribed by a relevant component specification@ or if agreed between a customer and a manufacturer.