Power quality analysis is a rapidly changing field, and is intrinsically linked to advances in digital technology. From its humble beginnings as analogue recorders that wrote a single voltage directly to a disk of paper, to devices that can measure hundreds of interharmonics and store a gigabyte of data, power quality analysis has benefited from the never ending march of technology. This paper will explore the history of PQ analysis equipment, from analogue recorders to recent devices, like those developed by Power Monitors Inc.

This white paper includes:

• Early PQ recording
• Digital evolution of PQ recording
• Modern advances