Yokogawa Test & Measurement has announced two AC/DC split core current sensors, the CT500SA and CT200SA, for measuring current on cables that can’t be cut to thread through a through-hole sensor. The second-generation models cover the 500 A and 200 A ranges, clamp directly onto a conductor and are built for space-constrained environments such as in-vehicle testing.
The main sensor unit of both measures 110 mm wide by 62 mm high by 25 mm deep. Each opens with a single unlock-and-open button that can be worked with one hand, and the body carries an M4 screw hole and a cable tie slot for fixing the sensor in place. Sensor outputs are sensitive to positioning, and Yokogawa says securing the sensor improves measurement repeatability.
Yokogawa puts accuracy at ±0.1% from -40° C to 85° C, improving to ±0.09% of reading plus 0.01% of full scale over a 23 ±5° C range, and phase accuracy at ±0.1° between 0.1 Hz and 1 kHz. The company rates that an order of magnitude better than conventional current sensors and on par with through-hole types, and says conventional split core sensors don’t meet the accuracy these applications require because of challenges introduced by their clamp-on design.
The CT500SA delivers a frequency bandwidth of 500 kHz (-3 dB), and the CT200SA extends to 1 MHz (-3 dB). Yokogawa says both can also measure the switching frequencies used in motor inverter validation, which require wideband measurement.
Post-assembly validation of inverters and motors leaves little room around components, and the cables can’t be cut. Yokogawa says lighter, more compact vehicle architectures limit access further for a sensor sized for 1,000 A like its existing CT1000S, particularly in applications at lower current ratings.
Engineers can switch between waveform and power analysis as they move through test phases. A current sensor is normally usable with only one class of instrument, either a power analyzer or a waveform measurement instrument. Both new models connect to either one directly, without a conversion connector or supporting accessory. Yokogawa says that eliminates sensor swaps, and that measuring identical signals removes the need to synchronize data afterward.
Yokogawa lists photovoltaic output measurement, HVAC current monitoring and inverter efficiency analysis of pulse width modulation (PWM) outputs with harmonic content among the applications, alongside EV testing.
Both sensors are scheduled for release on September 9, 2026.
Source: Yokogawa Test & Measurement
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