Can the WT1800/WT1800E measure Total Demand Distortion (TDD)?

Yes, the WT1800 can measure TDD using the following user-defined equation:

ITHD(E1)*IK(E1,OR1)/IL

IL=maximum demand load current. IL should be a constant entered by the customer based on IEEE 519 standards. The above equation is written for element 1.

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WT1800E - High-Performance

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Power Analyzers and Power Meters

Yokogawa, the world's largest manufacturer of energy and power analyzers and meters, provides a broad choice of digital power analyzers to satisfy all requirements.