NK Technologies AT/ATR 3 & 4 Series Average Responding or True RMS AC High Current Transducers

'AT/ATR 3 & 4' transducers from NK Technologies combine a high capacity current transformer and a signal conditioner into a single package for applications from 200A to 2000A. The AT version is Average Responding for use on linear (sinusoidal) loads. The ATR version is True RMS for use on distorted waveforms found in VFD or SCR outputs. Available in a solid-core case.

Selecting the right transducer: 

The current waveform of a typical linear load is a pure sine wave. AT transducers measure the peaks of these sine waves, then calculate the average amperage.  This works well on constant speed linear loads in a “clean” power environment.  Select AT transducers for strictly linear loads on “clean” power.  VFD and SCR output waveforms are rough approximations of a sine wave.  There are numerous spikes and dips in each cycle. ATR Transducers use a mathematical algorithm called “True RMS,” which integrates the actual waveform over time. The output is the amperage component of the true power (heating value) of the AC current waveform. True RMS is the only way to accurately measure distorted AC waveforms. Select ATR transducers for nonlinear loads on “noisy” power.

NK Technologies AT/ATR 3 & 4 Series Average Responding or True RMS AC High Current Transducers, Jumper Selectable Input Ranges, 4 - 20 mADC Output