Yokogawa Test & Measurement has released the second-generation of its AC/DC split core current sensors, the CT500SA and CT200SA. They have been designed specifically for space-constrained environments, such as in-vehicle xEV testing, offering high-accuracy current measurements for the 200-500A ranges.
The sensors are compatible with power analyzers and waveform measurement instruments, for improved testing reliability, efficiency and reduced sensor costs.
The main sensor unit of both devices measures a compact 110mm width × 62mm height × 25mm depth. Each features a single unlock-and-open button for one-handed clamp-on installation, while the body includes both an M4 screw hole and a cable tie slot to secure the sensor in place – directly improving measurement repeatability as outputs are sensitive to positioning.
The CT500SA and CT200SA guarantee accuracy of ±0.1% from -40℃ to 85℃. Within 23±5℃ range this improves further still, achieving a peak accuracy of ±0.09% of reading +0.01% of full scale. Both models guarantee accuracy one order of magnitude higher than that of conventional current sensors, equivalent to through-hole types but with the convenience of clamp-on installation.
Available frequency bandwidths differ between the two models. The CT500SA delivers a frequency bandwidth of 500kHz (-3dB), while the CT200SA extends to 1MHz (-3dB). The CT200SA and CT500SA can also measure switching frequencies, used for motor inverter validation and requiring wideband measurement. Both models hold a phase accuracy of ±0.1° (0.1Hz ≦ f ≦ 1kHz).
In addition to the automotive market, other sectors stand to benefit from these devices, too, which include renewable energy and HVAC.Â
