In summary, LEM DHR series are an accurate and cost-effective AC and DC current transducers for industrial system designers, system integrators and automation distributors. The DHR series of Hall effect measurement of DC signals as well as distorted current waveforms such as variable frequency drive (VFD) outputs. The computation of the "True RMS" value is based on a mathematical algorithm which integrates the actual waveform over time. Thus the DHR series is well appropriate for complex waveforms when the load is non-linear or in a “noisy” environment. The products are CE certified regarding the electromagnetic compatibility according to the European Directive 2004/108/EEC and tested according to the standard IEC 61326. The products are also CE certified regarding its safety according to the European directive 2006/95/EEC and tested according to the standards IEC 61010-1.