• • • TEST & MEASUREMENT • • •


comply with requirements such as time synchronisation, quality of probes, calibration period, temperature ranges, etc. Table 1 presents a list of requirements that instruments shall meet to be certified in one or the other class.


Figure 6: Classification of power quality parameters in a timescale


Key differences between Class A and Class S Defined by the IEC 61000-4-30 Standard


Although Class A defines higher levels of accuracy and precision than Class S, the differences are beyond just levels of accuracy. Instruments must


Conclusion Power quality issues are present across the whole electric infrastructure. Having equipment that monitors these PQ issues helps to improve performance, quality of service, and equipment lifetime while reducing economic losses.


In the subsequent article “How to Design a Standards Compliant Power Quality Meter,” we will introduce an integrated solution and a ready to use platform that can significantly accelerate development and reduce costs for developing PQ monitoring products.


Table 1: IEC 61000-4-30 Class A and Class S Key Differences


20 ELECTRICAL ENGINEERING • MARCH 2024


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