Supports Current Measurement of Inverters with High Current and High Speed

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 CT6876A has a frequency bandwidth of DC to 1.5 MHz (Model CT6876A-1 is DC to 1.2 MHz) and a rated current of 1000 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.

Use with an instrument with a high input impedance of 1 MΩ or higher.

Key Features

  • The ideal current sensor for measuring large 1000 A currents in EV, HEV, and PHEV
  • Strengthened shield improves noise resistance to accurately measure current buried in noise
  • Flat frequency characteristics and CMRR performance to achieve high accuracy measurement
  • More enhanced environmental resistance performance than ever before with operating temperature range of -40 to 85°C
  • Basic accuracy of ±0.04% and phase ± 0.1° 
  • Good frequency characteristics over wide band of DC to 1.5 MHz (amplitude) and DC to 1 MHz (phase)
  • Ideal for advanced fields such as photovoltaics and fuel cells to evaluate the charge / discharge of batteries and secondary side of inverters
  • Connect with oscilloscopes or Hioki Memory HiCorders (using SENSOR UNIT) to monitor waveforms

Model No. (Order Code)

CT6876A Cable length: 3 m (9.84 ft.)
CT6876A-1 Cable length: 10 m (32.81 ft.)

Unparalleled technology driving the evolution of current measurement

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

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.

Wide frequency band

The CT6876A has a frequency bandwidth of DC to 1.5 MHz (Model CT6876A-1 is DC to 1.2 MHz), which is top-class for a 1000 A rated pass-through sensor. In combination with the Power Analyzer PW8001, high frequency and low power factor power can be measured accurately.

Automatic Phase Correction function

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.

Automatic detection capability for even greater convenience

Automatic current sensor detection by Power Analyzer PW8001

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.

Basic specifications

Accuracy guaranteed: 1 year
Rated current 1000 A AC/DC
Max. allowable input Within the derating range, up to ±1800 Apeak (design value) allowed at 40°C or less for 20 ms or less
Frequency bandwidth Amplitude: DC to 1.5 MHz (CT6876A), DC to 1.2 MHz (CT6876A-1)
Phase: DC to 1 MHz
Basic accuracy (DC, 45 Hz ≤ f ≤ 66 Hz) Amplitude: ±0.04 % rdg. ±0.008 % f.s., Phase: ±0.1°
Output voltage rate 2 mV / A rated (This device outputs AC+DC voltage via the Sensor Unit)
Max. rated voltage to earth 1000 V AC/DC (50/60 Hz, CAT III )
Core diameter φ 36 mm (1.42 in)
Operating temperature, humidity -40°C to +85°C (-40°F to 185°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, or 3ch Current Unit U8977
Max. rated power 7.5 VA max. (at 1000 A/55 Hz)
Dimensions and mass 160 mm (6.30 in)W × 112 mm (4.41 in)H × 50 mm (1.97 in)D,
CT6876A: 970 g (34.2 oz), cable length 3 m (9.84 ft),
CT6876A-1: 1300 g (45.9 oz), cable length 10 m (32.81 ft)
Included accessories Instruction manual ×1, Mark bands ×6, Operating precautions ×1

Compatible models

Compatible models CT6876A
Power Analyzer
PW8001, PW6001, PW3390
Power Analyzer
Attention (Requires CT9901)
CT ratio 2
Power HiTester
3193 series
Attention (Requires CT9901)
CT ratio 2
Current Unit
Attention (Requires the 9318, CT9901) CT ratio 2
3ch Current Unit U8977 Ok

Options A (5)

Options B (2)

The CT9902 connects up to 2 cables in series