Raising the Bar for High-Accuracy Measurement

Hioki pass-through AC/DC current sensors are best-in-class devices for use with power meters, Memory HiCorders and high performance oscilloscopes. The CT6877 is a DC to 1 MHz/2000 A sensor, ideal for evaluating the inverter power conversion efficiency in next generation devices.
The CT6877 delivers a wide frequency band and excellent noise resistance, prerequisites for properly evaluating inverters motors used in electric vehicles and hybrid vehicles, a class of devices that continue to move toward ever larger currents and higher-frequency switching.

CAT III 1000 V

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

Key Features

  • Easily measure large 2000 A currents to meet applications in EV, HEV testing
  • Improved noise resistance performance through a stronger shield lets you accurately measure current buried in noise
  • High accuracy measurement realized through flat frequency characteristics and CMRR performance
  • More enhanced environmental resistance performance than ever before lets you measure in -40 to 85°C situations
  • Improved basic accuracy of ±0.04% and phase accuracy of ±0.1° 
  • Superior frequency characteristics of DC to 1 MHz (amplitude)
  • Meet a wide range of applications from measuring battery charge/discharge to the secondary side of inverters in photovoltaic power generation and fuel cell evaluation, etc. 
  • Monitor waveforms when paired with oscilloscopes or Memory HiCorders and Sensor Unit

Model No. (Order Code)

CT6877 2000 A AC/DC, ME15W terminal, 3 m (9.84 ft) cable length
CT6877-01 2000 A AC/DC, ME15W terminal, 10 m (32.81 ft) cable length

Through current sensor for 2000A

Most large currents are divided into two to four wires. In the past, it was necessary to measure wires individually using multiple current sensors due to the devices’ insufficient aperture size and current ratings. The optional Sensor Unit CT9557 provided functionality for adding together the sensors’ measured values in such setups and outputting the result as a single signal.
Thanks to its large, 80 mm aperture, the CT6877 can accommodate four wires with an outer diameter of 31 mm (equivalent to a cross-sectional area of 250 mm2). In this way, a single sensor can be used to collectively measure wires carrying up to 2000 A.

Unparalleled technology driving the evolution of current measurement

Current sensor performance is maximized with the “Zero Flux (Fluxgate Detection)” measurement method. High frequency current is detected with windings (CT method), and direct to low frequency current is detected with fluxgates. Use of a newly developed opposed split coil* for the winding (CT) makes possible a broad measurement band, while strengthened shielding boosts anti-noise performance.
*Opposed Split Coil: Coil in which divided windings are arranged opposite each other on a magnetic core to broaden the range of current detection

Broad frequency band

The CT6877 has a frequency band of DC to 1 MHz, placing it among the best-performing pass-through sensors rated for 2000 A and making it ideal for measuring currents being switched at high frequencies by SiC/GaN elements.

Guaranteed accuracy when used in combination with a power meter

Since the company develops both current sensors and power meters, Hioki is able to guarantee the combined accuracy of the products when used together for greater customer peace of mind. Used in conjunction with a high-precision power meter such as Hioki’s Power Analyzer PW6001, the CT6877 can measure currents with a high degree of accuracy.
● Example of the CT6877 being used with the Power Analyzer PW6001
From DC to 1 MHz, industry’s proven solution for high-accuracy power analysis.
The PW6001 features a phase shift function for current sensors to lock in accurate measurement of high-frequency power.
5 MS/s sampling at 18-bit resolution ensures true power analysis of PWM waveforms and results that are free of aliasing error.

Basic specifications

Accuracy guaranteed: 1 year
Rated current 2000 A AC/DC
Max. allowable input Within the derating range, (within the specified range up to ±3200 Apeak )
Frequency characteristics Amplitude: DC to 1 MHz, Phase: DC to 700 kHz
Basic accuracy (DC, 45 Hz ≤ f ≤ 66 Hz) Amplitude: ±0.04 % rdg. ±0.008 % f.s., Phase: ±0.1°
Output voltage rate 1 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 80 mm (3.15 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 PW6001, PW3390, or Sensor Unit CT9555, CT9556, CT9557
Max. rated power 9.5 VA max. (at 2000 A/55 Hz, ±12 V power requirement)
Dimensions and mass 229 mm (9.02 in)W × 232 mm (9.13 in)H × 112 mm (4.41 in)D, CT6877: 5 kg (176.4 oz), cable length 3 m (9.84 ft), CT6877-01: 5.3 kg (186.9 oz), cable length 10 m (32.81 ft)
Accessories Instruction manual ×1, Mark bands ×6, Operating precautions ×1

Options A (5)

Options B (2)

The CT9902 connects up to 2 cables in series

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