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Yokogawa Releases CT500SA and CT200SA Split Core Current Sensors
Yokogawa Test & Measurement Corporation introduces the CT500SA and CT200SA AC/DC split core current sensors for high-accuracy power and waveform testing.
www.yokogawa.com
Yokogawa Test & Measurement Corporation has announced the release of its CT500SA and CT200SA AC/DC split core current sensors on September 9, 2026. The compact sensors are engineered for high-current evaluation in space-constrained installations, including electric vehicle (xEV) powertrain validation, renewable energy systems, HVAC equipment, and artificial intelligence data centers.
Automotive Validation and Split Core Architecture
Late-stage electrified vehicle testing requires current measurements of inverters and electric drive motors post-assembly, where spatial clearance is restricted and cable disconnection or cutting is not permissible. While conventional through-hole transducers demand routing cables through a central aperture, split core designs clamp directly over existing conductors. The CT500SA and CT200SA deliver measurement accuracy comparable to through-hole units while maintaining clamp-on installation workflows.
Mechanical Dimensions and Operating Specifications
Both units feature a main enclosure measuring 110 mm in width, 62 mm in height, and 25 mm in depth, incorporating a single-button release mechanism for one-handed clamp-on engagement. Integrated M4 screw mountings and cable tie slots allow mechanical fixation to maintain positional stability and output repeatability.
- Measurement Range: Current ranges of 200 A for the CT200SA and 500 A for the CT500SA.
- Accuracy Rating: Guaranteed accuracy of plus or minus 0.09 percent of reading plus 0.01 percent of full scale within a temperature range of 23 plus or minus 5 degrees Celsius.
- Phase Accuracy: Plus or minus 0.1 degrees across frequencies from 0.1 Hz to 1 kHz.
- Frequency Bandwidth: DC to 500 kHz at minus 3 dB for the CT500SA, and DC to 1 MHz at minus 3 dB for the CT200SA.
Dual-Instrument Connectivity and Application Scope
The CT500SA and CT200SA interface directly with digital power analyzers and waveform measurement instruments without requiring auxiliary conversion adapters. This common interface architecture eliminates the need for sensor swaps between power efficiency assessments and pulse-width modulation (PWM) switching waveform captures, avoiding data synchronization discrepancies between separate test benches.
Target use cases include inverter efficiency analysis, photovoltaic solar output monitoring, power grid conversion testing, and current monitoring across data center thermal management infrastructure.
Additional Context
This section details technical specifications not included in the original news release.
High-precision AC/DC split core current transducers utilize closed-loop fluxgate technology rather than traditional open-loop Hall effect elements. In a fluxgate architecture, a high-permeability magnetic core is periodically driven into magnetic saturation by an alternating excitation current. The presence of an external primary direct or alternating conductor current creates an asymmetry in the core's magnetic saturation point, inducing even-order harmonic signals across secondary detection windings.
A closed-loop compensation circuit amplifies this harmonic feedback to drive an opposing secondary current that cancels the primary magnetic flux within the core. This zero-flux operating state eliminates core non-linearity, reduces thermal drift, and delivers low insertion impedance. The sensor heads accommodate primary conductor diameters up to 20 millimeters and output a scaled voltage signal across standard BNC coaxial terminations, with operating temperature tolerances spanning minus 40 degrees Celsius to plus 85 degrees Celsius at the sensor head.
Edited by Romila DSilva, Induportals Editor, with AI assistance.
The CT500SA and CT200SA interface directly with digital power analyzers and waveform measurement instruments without requiring auxiliary conversion adapters. This common interface architecture eliminates the need for sensor swaps between power efficiency assessments and pulse-width modulation (PWM) switching waveform captures, avoiding data synchronization discrepancies between separate test benches.
Target use cases include inverter efficiency analysis, photovoltaic solar output monitoring, power grid conversion testing, and current monitoring across data center thermal management infrastructure.
Additional Context
This section details technical specifications not included in the original news release.
High-precision AC/DC split core current transducers utilize closed-loop fluxgate technology rather than traditional open-loop Hall effect elements. In a fluxgate architecture, a high-permeability magnetic core is periodically driven into magnetic saturation by an alternating excitation current. The presence of an external primary direct or alternating conductor current creates an asymmetry in the core's magnetic saturation point, inducing even-order harmonic signals across secondary detection windings.
A closed-loop compensation circuit amplifies this harmonic feedback to drive an opposing secondary current that cancels the primary magnetic flux within the core. This zero-flux operating state eliminates core non-linearity, reduces thermal drift, and delivers low insertion impedance. The sensor heads accommodate primary conductor diameters up to 20 millimeters and output a scaled voltage signal across standard BNC coaxial terminations, with operating temperature tolerances spanning minus 40 degrees Celsius to plus 85 degrees Celsius at the sensor head.
Edited by Romila DSilva, Induportals Editor, with AI assistance.
