Best-in-class Measurement Bandwidth with High Accuracy
Hioki's pass-through type AC/DC current sensors can be connected directly to Hioki Power Analyzers and Memory HiCorders. Also, it can be connected to Power Meters, Oscilloscopes, DMMs, etc. by using an optional sensor unit.
The CT6904A-2 has a frequency bandwidth of DC to 4 MHz (Model CT6904A-3 is DC to 2 MHz) and a rated current of 800 A. It is used in research and development fields such as loss measurement of high-frequency reactors, wireless charging systems, and EV inverter motors.
High-accuracy sensors uses the "zero flux method (flux gate 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 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 measurement such as inverter efficiency, inverter output power, reactor/transformer loss, and long-term DC measurements.
The CT6904A-2 has a frequency bandwidth of DC to 4 MHz (Model CT6904A-3 is DC to 2 MHz), which is top-class for a 800 A rated pass-through sensor. In combination with the Power Analyzer PW8001, high frequency and low power factor can be measured accurately.
To accurately measure high frequency and low power factor, it is important to correct phase errors. 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.
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.
The current sensor is equipped with a 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.
In the past, phase correction values had to be entered manually.
However, thanks to the automatic detection system of current sensor information, forgetting settings and typing errors are eliminated, allowing for more accurate power calculations.
| Rated current | 800 A AC/DC |
|---|---|
| Max. allowable input | Within the derating range, However, up to ±1200 A peak is allowable if within 20 ms. (design value) |
| Frequency bandwidth | Amplitude: DC to 4 MHz (CT6904A-2), DC to 2 MHz (CT6904A-3) Phase: DC to 1 MHz |
| Linearity | ±12.5 ppm Typical (23°C (73°F)) |
| Offset voltage | ±10 ppm Typical (23°C (73°F), no input) |
| Basic accuracy | DC (Amplitude: ±0.030 % rdg. ±0.009 % f.s., No phase specification) 45 Hz ≤ f ≤ 65 Hz (Amplitude: ±0.025 % rdg. ±0.009 % f.s., Phase: ±0.08°) |
| Output voltage rate | 2 mV / A rated (This device outputs AC+DC voltage via the Sensor Unit) |
| Max. rated voltage to earth | 1000 V CAT III |
| Core diameter | φ 32 mm (1.26 in) |
| Operating temperature, humidity | -10°C to 50°C (14°F to 122°F) 80% RH or less (with no condensation) |
| Power supply | Power suppled via the Power Analyzer PW8001, PW6001, PW3390, or Sensor Unit CT9555, CT9556, CT9557 |
| Max. rated power | 7 VA Max. (800 A/55 Hz measurement, with a power supply of ±12 V) |
| Dimensions and mass | 139 mm (5.47 in)W × 120 mm (4.72 in)H × 52 mm (2.05 in)D, CT6904A-2: 1.15 kg (40.6 oz), cable length 3 m (9.84 ft), CT6904A-3: 1.45 kg (51.1 oz), cable length 10 m (32.81 ft) |
| Included accessories | Instruction Manual ×1, Carrying case ×1, Color labels (for channel identification) ×1, Operating Precautions ×1 |
