AS/NZS IEC 61000.4.30:2023 identically adopts IEC 61000 4 30:2015+AMD1:2021 CSV, which defines the methods for measurement and interpretation of results for power quality parameters in a.c. power supply systems with a declared fundamental frequency of 50 Hz or 60 Hz. Measurement methods are described for each relevant parameter in terms that give reliable and repeatable results, regardless of the method’s implementation. This document addresses measurement methods for in-situ measurements.