AT/ATR 3 & 4 Series Current Transducers
combine a 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 ouputs.
Available in a solid-core case.
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 "clean"
power environments. 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 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."