Description
Hioki CT6904A-2 Sensor for Large AC/DC Current Measurement
The Hioki CT6904A-2 Sensor is a premium AC/DC current sensor built for high-accuracy measurement of large currents, up to 800 A. With a wide frequency bandwidth of DC to 4 MHz (CT6904A-2) or DC to 2 MHz (CT6904A-3), it is optimized for capturing both low-frequency DC signals and high-frequency AC currents, making it perfect for advanced R&D, industrial testing, and EV applications.
High-Precision Flux Gate Detection
The CT6904A-2 uses Hioki’s advanced zero-flux method (flux gate detection) to ensure outstanding linearity and temperature stability. DC and low-frequency currents are detected using flux gate technology, while high-frequency currents are measured with the CT winding method. This dual-detection system guarantees highly accurate measurements across a wide range of currents and frequencies.
Wide Frequency Range and Noise Resistance
With its DC to 4 MHz (CT6904A-2) or DC to 2 MHz (CT6904A-3) bandwidth, the sensor excels in high-speed measurements such as EV inverter efficiency and wireless charging system testing. Its unique solid shield design enhances noise resistance, enabling precise readings even in electrically noisy environments.
Automatic Phase Correction and Sensor Detection
When paired with the Hioki PW8001 Power Analyzer, the CT6904A-2 automatically corrects phase errors with 0.001° resolution. The built-in memory (I2C-EEPROM) allows automatic recognition of the sensor’s rated current, model, serial number, and phase correction data, eliminating manual entry errors and improving measurement reliability.
Ideal Applications
The Hioki CT6904A-2 Sensor is designed for:
- EV inverter motor evaluation and efficiency testing
- Wireless power transfer and charging system analysis
- High-frequency reactor and transformer loss measurement
- Industrial R&D for power electronics
- Long-term DC measurement and quality control
Engineers and researchers benefit from the CT6904A-2’s combination of high current capability, wide bandwidth, and reliable, automated measurement features.
Technical Specifications
| Specification | Details |
| Product Name | Hioki CT6904A-2 / CT6904A-3 AC/DC Current Sensor |
| Rated Current | 800 A |
| Frequency Bandwidth | DC to 4 MHz (CT6904A-2), DC to 2 MHz (CT6904A-3) |
| Common-Mode Rejection Ratio | 120 dB at 100 kHz |
| Phase Correction | Automatic with PW8001 |
| Noise Resistance | High via solid shield design |
| Detection Method | Flux gate (DC/low freq.), CT winding (high freq.) |
| Automatic Detection | Yes, via PW8001 Power Analyzer |
| Cable Length Options | 3 m (CT6904A-2), 10 m (CT6904A-3, build-to-order) |
| Compatibility | PW8001, PW6001, oscilloscopes, DMMs, Memory HiCorders |
| Applications | EVs, inverters, wireless charging, high-frequency reactors |
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