INTRODUCTION The CT 235 and the CT-237 current Probe have been designed for use with Digital multimeter recorders and other suitable equipment for accurate non-intrusive measurement of AC, DC and complex waveform currents. Using advanced Hall Effect technology the CT-237 can accurately measure currents up to 200 A r.m.s. over the frequency range of DC to 10 kHz, while the CT 235 measures currents up to 1000A DC or AC peak. These features make them powerful tools for use in inverters, switch mode power supplies, industrial controllers, automotive diagnostics and other applications requiring accurate isolated current measurement.