Yokogawa Test & Measurement has introduced the CT500SA and CT200SA ac/dc split-core current sensors for high-accuracy current measurement in space-constrained applications, including in-vehicle EV testing.
The sensors cover 500 and 200 A ranges and are designed for measurements performed after vehicle assembly, when access around high-voltage components is limited and cables cannot be disconnected.
Unlike through-hole current sensors, split-core devices clamp directly around existing conductors. This can simplify installation during late-stage vehicle testing, where engineers may need to move sensors between measurement points or switch between waveform and power analysis.
Both models measure 110 × 62 × 25 mm and include a one-button opening mechanism for clamp-on installation. Mounting features include an M4 screw hole and cable-tie slot to help maintain sensor position during testing.
The CT500SA and CT200SA provide accuracy of ±0.1% from -40° to 85° C. At 23 ±5° C, accuracy reaches ±0.09% of reading plus 0.01% of full scale.
The CT500SA provides a 500-kHz bandwidth, while the CT200SA extends to 1 MHz. These bandwidths allow the sensors to measure switching frequencies used during motor inverter validation. Both models provide phase accuracy of ±0.1° from 0.1 to 1 kHz.
The sensors can connect directly to both power analyzers and waveform measurement instruments without a conversion connector. This allows engineers to use the same sensor for multiple measurements during EV development and validation.
Target applications include in-vehicle measurements on near-finished EVs and inverter efficiency testing involving pulse-width-modulated outputs.
Filed Under: Sensors, Technology News, Test And Measurement