TEST & MEASUREMENT


Figure 6. Classification of power quality parameters in a timescale.


verify compliance of the standard.


• Class S is used for power quality assessment, statistical analysis applications, and diagnostics of power quality problems with low uncertainty. The instrument in this class can report a limited subset of  The measurements made with Class S instruments can be done on several sites on a network, on complete locations or even on single pieces of equipment.


It is important to note that the standard  a guide for the interpretation of the results, and  meter. It does not give guidelines on the design for the instrument itself.





following PQ parameters for Class A and Class S measurement devices.12 • Power frequency • Magnitude of the supply voltage and current • Flicker • Supply voltage dips and swells • Voltage interruptions • Supply voltage unbalance • Voltage and current harmonics and inter- harmonics


• Rapid voltage change • Under-deviation and over-deviation • Mains signalling voltage on the supply voltage


KEY DIFFERENCES BETWEEN CLASS A AND CLASS S DEFINED BY THE IEC 61000-4-30 STANDARD


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


 and precision than Class S, the differences are beyond just levels of accuracy. Instruments must 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  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  development and reduce costs for developing PQ monitoring products.


www.analog.com January/February 2026 Irish Manufacturing 27


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