• Superior frequency characteristics of DC to 4 MHz (amplitude)
• A stronger shield for excellent noise resistance allows for accurate measuring of current buried in noise
• Ideal for solar power, fuel cells to measure battery charge/discharge and secondary side of inverters
• The automatic detection system of current sensor information when connected to a power analyzer
• Use with oscilloscopes or Memory HiCorders for observing waveforms (optional sensor unit required

The Hioki CT6904A has a frequency bandwidth of DC to 4 MHz and a rated current of 500 A. It is used for R&D, quality evaluation, manufacturing, and maintenance in markets such as wireless charging systems, inverter motors for industrial equipment, power conditioners for PV, and quick charging facilities for EVs.

Hioki's pass-through type AC/DC current sensors can be connected directly to Hioki Power Analyzers and Memory HiCorders. Also, they can be connected to Power Meters, Oscilloscopes, DMMs, etc. by using an optional sensor unit.

Please click here for Hioki Instrument Connections for High Accuracy Current Sensors

Pass-through sensors deliver the ultimate level of accuracy and stability. With a broadband measurement at up to 10 MHz and measurement of large currents of up to 2000 A, they’re used in state-of-the-art research and development, and in applications that require high measurement accuracy, for example, evaluation of inverter equipment and evaluation of loss in reactors and transformers.

Additionally, sensors that can resist noise are necessary since noise becomes stronger as the frequency increases. These current sensors measure power accurately while providing robust noise resistance over a broadband of frequencies. In high-frequency measurement, sensors’ resistance to noise is critical. A sensor’s ability to remove noise is expressed by its common-mode rejection ratio (CMRR). Sensors with a high CMRR reject more noise and therefore can make more accurate measurements

High-accuracy sensors use the "zero flux method (fluxgate detection type)." High-frequency currents are detected with the winding (CT method), and DC to low-frequency currents are detected using a "flux gate."

Flux Gate Detection

Fluxgate detection delivers outstanding linear properties and can measure currents of a wide range of magnitudes with high accuracy. The fluxgate components used for DC detection have very low offset over a wide temperature range due to their operating principle, resulting in high accuracy and excellent temperature stability. It is ideal for measurements that require high accuracy, such as Power analyzers and Power meters. It can be used for measurements such as inverter efficiency, inverter output power, reactor/transformer loss, and long-term DC measurements.

The CT6904A has a frequency bandwidth of DC to 4 MHz and a rated current of 500 A. In combination with the Power Analyzer PW8001, high frequency and low power factor power can be accurately measured. The PW8001 automatically acquires and corrects the phase of the current sensor with 0.001°resolution, bringing out the best performance of the current sensor without any effort.

Automatic Current Sensor Detection

The current sensor is equipped with memory (I2C-EEPROM). When the current sensor is connected to the Power Analyzer PW8001, the phase correction data, rated current, sensor's model name, and serial number are automatically recognized by the instrument.

By completely shielding the oppositely arranged split coils with a unique-shaped solid shield, it achieves both wide bandwidth and superior noise resistance. Accurate measurement can be performed without being affected by ambient voltage.

Please click here for Introduction and Applications of High Accuracy Current Sensors

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