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/2000A 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 Key Features • Easily measure large 2000A 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 2 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 for 1 year, Post-adjustment accuracy guaranteed for 1 year)

Rated current2000 A AC/DC
Max. allowable inputWithin the derating range, (within the specified range up to ±3200 Apeak )
Frequency characteristicsAmplitude: 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 rate1 mV / A rated (This device outputs AC+DC voltage via the Sensor Unit. Use with voltage input equipment with high input impedance such as 1 MΩ)
Max. rated voltage to earth1000 V AC/DC (50/60 Hz, CAT III )
Core diameterφ 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 supplyPower suppled via the Power Analyzer PW6001, PW3390, or Sensor Unit CT9555, CT9556, CT9557
Max. rated power9.5 VA max. (at 2000 A/55 Hz, ±12 V power requirement)
Dimensions and mass229 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)
AccessoriesInstruction manual ×1, Mark bands ×6, Operating precautions ×1

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Seminar Videos On Demand

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Seminar Schedule

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Catalog: HIGH ACCURACY / WIDEBAND CURRENT SENSOR Series CT686x, CT687x, CT684x Download PDF  [6MB] English
Catalog: AC/DC CURRENT SENSOR CT6877, CT6876, CT6875 Download PDF  [2MB] English

User Guides

Current Measurement Method for Electric Wire with Shield Download PDF  [310KB] English


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Instruction Manual English
Instruction Manual Simplified Chinese

Outline Drawings

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Declaration of Conformity


Drivers, Firmware

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Options A


• 1 channel • Waveform output

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• 1 channel, ±0.2% DC accuracy • Waveform and RMS output

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• 4 channels, ±0.06% DC accuracy • Waveform, total waveform, and total RMS output

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Cord has insulated BNC connectors at both ends, 1.6 m (5.25 ft) length


Cord has metallic BNC connectors at both ends, use at metallic terminal, 1.5 m (4.92 ft) length

Options B

The CT9902 connects up to 2 cables in series


ME15W (12 pin) to PL23 (10 pin) connector


5 m (16.41 ft) length, ME15W (12 pin) - ME15W (12 pin) connector


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