Description
Hioki CT6904A Sensor for High-Precision AC/DC Current Measurement
The Hioki CT6904A Sensor is a cutting-edge AC/DC current sensor engineered for high-accuracy measurements of large currents, making it ideal for advanced R&D, industrial, and EV applications. Rated for up to 500 A, this sensor supports a wide frequency bandwidth of DC to 4 MHz (CT6904A) or DC to 2 MHz (CT6904A-1), enabling precise capture of both DC and high-frequency AC signals. This combination of high current capability and wide frequency response is perfect for applications such as inverter efficiency testing, wireless charging evaluation, high-frequency reactor analysis, and EV motor monitoring.
Advanced Flux Gate Detection
Hioki’s flux gate detection method provides outstanding linearity and excellent temperature stability. DC and low-frequency currents are measured using the flux gate principle, while high-frequency currents are detected with the CT winding method. This dual-detection approach ensures consistent, highly accurate measurements across a wide current range.
Wideband Performance with Noise Resistance
With a frequency bandwidth up to 4 MHz, the CT6904A achieves top-class performance for its rating. Its unique solid-shield design minimizes noise interference, allowing accurate readings even in electrically noisy environments. This feature is essential for high-speed inverter and EV power measurements.
Automatic Phase Correction and Sensor Detection
The CT6904A works seamlessly with Hioki’s PW8001 Power Analyzer, which automatically corrects phase errors with 0.001° resolution. The sensor’s built-in memory (I2C-EEPROM) enables automatic recognition of phase correction data, rated current, model, and serial number, eliminating manual input errors and ensuring reliable measurements every time.
Ideal Applications
The Hioki CT6904A Sensor is optimized for:
- EV inverter motors and quick charging systems
- Wireless power transfer systems
- High-frequency reactors and transformers
- R&D and industrial efficiency evaluation
- Long-term DC measurements
Engineers and researchers can rely on the CT6904A for precise, repeatable, and high-speed current measurement, ensuring confidence in both testing and production environments.
Technical Specifications
| Specification | Details |
| Product Name | Hioki CT6904A AC/DC Current Sensor |
| Rated Current | 500 A |
| Frequency Bandwidth | DC to 4 MHz (CT6904A), DC to 2 MHz (CT6904A-1) |
| Linearity | ±5 ppm |
| Common-Mode Rejection Ratio | 120 dB at 100 kHz |
| Phase Correction | Automatic with PW8001 |
| Noise Resistance | High, via solid-shield design |
| Operating Temperature | Not specified (ambient rated) |
| Cable Length Options | 3 m (CT6904A), 10 m build-to-order (CT6904A-1) |
| Detection Method | Flux gate (DC/low freq.), CT winding (high freq.) |
| Compatibility | PW8001, PW6001, oscilloscopes, DMMs, Memory HiCorders |
| Applications | EVs, wireless charging, high-frequency reactors, inverter testing |
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