Zero-flux Current Clamps: Accuracy without effort from mA to kA
Since 1978, HIOKI has been perfecting fluxgate-based zero-flux technology for the highest measurement accuracy – consistently setting new standards in the precision of current clamps.
Simply clamp and measure.
Whatever you need to measure, HIOKI has the right current clamp for you. From vehicle power testing and production quality control to power electronics and precision waveform analysis, our clamps deliver stable, reliable, and high-accuracy measurements - all without interrupting your setup.
HIOKI’s AC/DC current clamps offer the perfect balance of ease of use and high-precision measurement, thanks to fluxgate-technology in a practical split-core design. Engineered for non-contact current measurement, these clamps enable fast, hassle-free deployment in both laboratory and field applications.
| Large Clamps up to 1 kA / 200 kHz |
Precision Clamps up to 500 A / 2 MHz |
NEW Compact Clamps up to 500 A / 50 kHz | Ultra-compact Sensors up to 20 A / 100 kHz | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Model | 🔗 CT6846A | 🔗 CT6845A | 🔗 CT6844A | 🔗 CT6843A | 🔗 CT6841A | 🔗 CT6834 | 🔗 CT6833 | 🔗 CT6831 | 🔗 CT6830 |
| Rated Current | ±1000 A | ±500 A | ±500 A | ±200 A | ±20 A | ±500 A | ±200 A | ±20 A | ±2 A |
| Bandwidth | DC – 100 kHz | DC – 200 kHz | DC – 500 kHz | DC – 700 kHz | DC – 2 MHz | DC – 50 kHz | DC – 100 kHz | ||
| Basic Accuracy | ±0.2% rdg | ±0.07% rdg | ±0.3% rdg | ||||||
| Output Voltage | 2 mV/A | 4 mV/A | 10 mV/A | 100 mV/A | 4 mV/A | 10 mV/A | 100 mV/A | 1 V/A | |
| Max. Conductor Diameter | Ø 50 mm | Ø 20 mm | Ø 5 mm | ||||||
Current, Bandwidth & Size: Pick your Clamp
High-accuracy and super-slim “dolphin" current clamps: CT6833 & CT6834
Form follows function: The CT6833 and CT6834 AC/DC Current Clamps deliver near pass-through sensor basic accuracy of ±0.07% packed in an ultra-slim design.
Achieve exceptional measurement precision for demanding tests like WLTP, thanks to fluxgate-technology and a wide operating temperature range.
Key features
- AC/DC Currents up to 500 A (CT6834) | 200 A (CT6833)
- Frequency bandwidth: DC to 50 kHz
- Max conductor diameter: 20 mm
- Operating temperature range: -40°C to +85°C
- DC accuracy of ±0.07% rdg.
CT6833
CT6833 - Super-slim AC/DC high-accuracy Current Clamp, 200 A / 50 kHz
Ultra-slim AC/DC current clamp using advanced fluxgate technology, 200 A rated current, DC to 50 kHz frequency bandwidth, high accuracy ±0.07% rdg., wide temperature range of -40°C to +85°C, maximum conductor diameter 20 mm, cable length 5 m
CT6834
CT6834 - Super-slim AC/DC high-accuracy Current Clamp, 500 A / 50 kHz
Ultra-slim AC/DC current clamp using advanced fluxgate technology, 500 A rated current, DC to 50 kHz frequency bandwidth, high accuracy ±0.07% rdg., wide temperature range of -40°C to +85°C, maximum conductor diameter 20 mm, cable length 5 m
See the super-slim CT6833 and CT6834 Current Clamps in action!
These two clamps make a difference with their compact, user-friendly design that enables quick and easy installation. Make current measurements faster and more accurate than ever and with outstanding measurement stability - perfect for real-world testing.
Advanced current sensing up to 1000 A and 2 MHz: the CT684xA-series
The CT684xA series consists of 5 models delivering high-precision AC/DC current measurement with two clamp sizes: for conductors up to 50 mm diameter and up to 1000 A (CT6846A) and for conductors up to 20 mm diameter up to 500 A (CT6844A). Based on fluxgate technology, all clamps provide stable and accurate measurements over bandwidths from DC to 2 MHz.
Ideal for automotive testing, power electronics, and industrial monitoring, these clamps provide reliable insights for high-frequency analysis, inverter efficiency testing, and quality control.
Key features
- AC/DC Currents of 1000 A (CT6846A) | 500 A (CT6845A, CT6844A) | 200 A (CT6843A) | 20 A (CT6841A)
- Frequency bandwidth: DC to 2 MHz*
- Max. conductor diameter: 20 - 50 mm*
- Operating temperature range: -40°C to +85°C
- DC accuracy of ±0.2% rdg.
*see each model for specifications
CT6841A
CT6841A - AC/DC High-accuracy Current Clamp, 20 A / 2 MHz
AC/DC current clamp using advanced fluxgate technology, 20A rated current, basic accuracy ±0.2% rdg., wide temperature range of -40 °C to 85 °C, wide bandwidth from DC to 2 MHz, maximum conductor diameter 20 mm, cable length 3 m
CT6843A
CT6843A - AC/DC High-accuracy Current Clamp, 200 A / 700 kHz
AC/DC current clamp using advanced fluxgate technology, 200A rated current, basic accuracy ±0.2% rdg., wide temperature range of -40 °C to 85 °C, wide bandwidth from DC to 700 kHz, maximum conductor diameter 20 mm, cable length 3 m
CT6844A
CT6844A - AC/DC High-accuracy Current Clamp, 500 A / 500 kHz
AC/DC current clamp using advanced fluxgate technology, 500A rated current, basic accuracy ±0.2% rdg., wide temperature range of -40 °C to 85 °C, wide bandwidth from DC to 500 kHz, maximum conductor diameter 20 mm, cable length 3 m
CT6845A
CT6845A - AC/DC Current Probe, Fluxgate, 500 A / 200 kHz
AC/DC current clamp using advanced fluxgate technology, 500A rated current, basic accuracy ±0.2% rdg., wide temperature range of -40 °C to 85 °C, bandwidth from DC to 200 kHz, maximum conductor diameter 50 mm, cable length 3 m
CT6846A
CT6846A - AC/DC High-accuracy Current Clamp, 1000 A / 100 kHz
AC/DC current clamp using advanced fluxgate technology, 1000A rated current, basic accuracy ±0.2% rdg., wide temperature range of -40 °C to 85 °C, bandwidth from DC to 100 kHz, maximum conductor diameter 50 mm, cable length 3 m
Ultra-compact current probes up to 20 A: CT6830 & CT6831
HIOKI’s smallest AC/DC current probes CT6830 and CT6831 are engineered to perform in tight spaces. With a practical slide mechanism, they ensure quick installation and stable measurements on conductors in confined environments. These small split-core probes also feature fluxgate-technology, delivering exceptional accuracy and reliability even in extreme conditions.
Both probes easily connect with power analyzers, DAQ systems and oscilloscopes making them the perfect choice for precise current measurements in electronics, vehicle development and power engineering.
Key features
- Rated current: up to 2 A (CT6830) | up to 20 A (CT6831)
- Frequency bandwidth: DC to 100 kHz
- Max. conductor diameter: 5 mm
- Wide temperature range -40°C to +85°C
- High accuracy ±0.3 % rdg.
CT6830
CT6830 - Ultra-compact AC/DC Current Probe, 2 A / 100 kHz
Ultra-small, zero-flux clamp-on AC/DC Current Probe using flux gate detection, high accuracy ±0.3 %, wide temperature range -40 to 85 oC, measurable current from 100 µA to 2 A, ME15W connector
CT6831
CT6831 - Ultra-compact AC/DC Current Probe, 20 A / 100 kHz
Ultra small zero flux clamp-on AC/DC Current Probe using flux gate detection, high accuracy ±0.3 %, wide temperature range -40 to 85 oC, measurable current from 1 mA to 20 A, ME15W connector
💡 What’s the right clamp for you? – Here’s your checklist
Which clamp fits your needs best? To find the right one, check your main parameters
- How much current do I need to measure?
Up to 1000 A for power monitoring or 20 A for detailed circuit analysis?
- What bandwidth do I need to cover?
Do I require high-frequency precision up to 2 MHz?
- Where will I use it, and what size do I need?
Ø50 mm for large conductors or Ø5 mm for smaller ones? How much space is available?
The answers will guide you to the right current sensor equipment for your automotive, power electronics, or industrial setups
Do you need a current sensor with a higher bandwidth?
Find our Hall-based current sensors
Power up your precision with our sensor units: CT9555, CT9556, CT9557
The CT955x Sensor Units allow to use HIOKI precision current clamps with any suitable instrument. Select from three models that enable stable power supply and accurate BNC signal output to connect with your power meter, oscilloscope or DAQ-system.
- 🔗 CT9555: A single-channel unit offering waveform output, ideal for applications requiring accurate waveform measurements from a single source.
- 🔗 CT9556: This single-channel unit provides waveform and RMS signal output, perfect for applications that require both simultaneously.
- 🔗 CT9557:This four-channel solution can be used for each channel independently or aggregate all inputs into a single output. Supporting up to four current clamps or sensors, it is ideal for measuring large currents or parallel conductor configurations.
CT9555
CT9555 - SENSOR UNIT
The CT9555 is a power supply unit designed for single-channel current sensors providing a high-precision waveform output. It is ideal for applications requiring accurate waveform measurement from a single source. Technical Details: Channels: 1 Output: Waveform (BNC terminal) Power consumption: 45 VA max Power supply: AC Adapter Z1008 Input connector type: Hioki ME15W female terminal Output connector type: BNC Dimensions: 33 x 67 x 132 mm Weight: 200 gSupported sensors: 9272-05, CT684x-05, CT684xA, CT686x-05, 9709-05, CT687x, CT687xA, PW9100, CT6904, CT6904A
CT9556
CT9556 - SENSOR UNIT
The CT9556 is a power supply unit designed for single-channel current sensors. It offers waveform and RMS output for a single channel. It is ideal for applications requiring accurate waveform and RMS measurement from a single source. Technical details Channels: 1 Output: Waveform and RMS (BNC terminal) Power consumption: 45 VA max Power supply: AC Adapter Z1008 Input connector type: Hioki ME15W female terminal Output connector type: BNC Dimensions: 33 x 67 x 132 mm Weight: 200 g Supported sensors: 9272-05, CT684x-05, CT684xA, CT686x-05, 9709-05, CT687x, CT687xA, PW9100, CT6904A
CT9557
CT9557 - SENSOR UNIT
The CT9557 is a power supply unit that supports up to four Hioki current sensors. It can aggregate the provided waveforms for total output. It is ideal for large current or multi-cable circuits. Technical detailsChannels: 4 Output: Waveform, total waveform, and total RMS (BNC terminals) Power consumption: 155 VA max Power supply: AC Adapter Z1002 Input connector type: Hioki ME15W female terminal
• Output connector type: BNC Dimensions: 116 x 67 x 132 mm Weight: 420 g Supported sensors: 9272-05, CT684x-05, CT684xA, CT686x-05, 9709-05, CT687x, CT687xA, PW9100, CT6904A
➡ You would like to integrate our clamps?
For other solutions to integrate the HIOKI current clamps or sensors into your measurement system, contact us to get information about the HIOKI ME15W connector specifications.
DC Current Measurement and Bandwidth
Ever wondered why bandwidth matters in DC current measurement? This blog article explores how bandwidth affects accuracy and the ability to capture rapid changes in current. Understanding these factors is key to choosing the right measurement method or sensor type for your application.
“All you needed was a precise sensor to measure DC current – but after talking to HIOKI you ended up ordering a 10MHz AC/DC current sensor… Does HIOKI employ sales magicians who can sell ice to eskimos? Or does bandwidth simply also matter when measuring DC?!"
Analysis, Monitoring and Recording – HIOKI Current Measurement Solutions
High-precision power analysis: PW3390 Power Analyzer
The PW3390 Power Analyzer delivers high-accuracy power measurement for development, production, and field testing in a portable 4-channel design. With ±0.09% basic accuracy, it ensures precise efficiency analysis, while its 50 ms update rate enables accurate real-time transient and harmonic capturing.
Perfect for motor and inverter measurement, renewable energy, and industrial power system analysis, the PW3390 also supports WLTP testing, making it an essential tool for evaluating energy efficiency in hybrid, full-electric, and ICE vehicles.
Key features
- ±0.09% basic accuracy
- DC to 200 kHz bandwidth
- 4 power channels
- Motor efficiency analysis for torque, speed, and mechanical power
- 50 ms update rate
PW3390
PW3390 - Portable 4-channel Power Analyzer
Portable 4-channel Power Analyzer, ±0.09% basic accuracy, DC to 200 kHz measurement
band for power, 16-bit conversion, phase shift correction for HIOKI current sensors, 50 ms
data update rate, 16-ch waveform/analog output, motor analysis function, WLTP compliant Banner Specs: ±0.09% basic power accuracy 4 power channels 200 kHz measurement band for power50 ms data update rate 1500 V max. input voltage USPs: - Approved for WLTP testing - Small and lightweight 4-channel power analyzer with motor analysis Applications: WLTP testing Inverter efficiency measurements Motor efficiency measurements Solar power converter efficiency measurements
Model
D/A Output
Motor Analysis
PW3390-01
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☐
PW3390-02
☒
☐
PW3390-03
☒
☒
In detail:The HIOKI PW3390 Power Analyzer is a compact, lightweight, 4-channel high-precision
instrument designed to meet the demands of power and efficiency analysis across industries.
Equipped with advanced features, this analyzer excels in measuring and analyzing electrical
power and energy, making it an ideal solution for development, production, and field testing.Built for precision, the PW3390 delivers highly accurate power measurements with a basic
accuracy of ±0.09%, ensuring reliable data for various applications. Its 4 power channels
enable simultaneous multi-system evaluations with a frequency measurement band of up to
200 kHz for power.The instrument's harmonic analysis capabilities, featuring a data refresh time of 50 ms, allow
users to study transient states and evaluate noise or harmonic interference up to 100 kHz.With motor analysis functionality, the PW3390 is perfect for motor and inverter efficiency
evaluations. It provides measurements for torque, rotation speed, slip, and mechanical
power, enabling comprehensive performance analysis of industrial drives. Multiple PW3390 units can be connected to operate as a coordinated measurement system
with up to 32 channels. One unit serves as the primary controller, synchronizing the timing
across all devices to ensure simultaneous data acquisition. For long-term monitoring, the PW3390 can be equipped with the D/A output function, offering
a 16-channel analog output. The first 8 channels can be configured to output waveforms of
all voltage and current inputs at an update rate of 500 kS/s. The remaining 8 channels can be
assigned to numeric measurement values of basic parameters like U1, I2, and P4, with an
update rate of 20 S/s. The PW3390 is ideally suited for use in the automotive sector, particularly for efficiency
analyses of inverters in hybrid and electric vehicles, as well as for standardized testing
procedures to determine energy consumption like WLTP (Worldwide Harmonized Light
Vehicles Test Procedure). It also excels in renewable energy and power conversion
applications, providing precise input and output power data for power conditioners.Designed with a user-friendly interface and a rugged build, the HIOKI PW3390 ensures
intuitive operation and durability in industrial settings. Whether analyzing WLTP efficiency for
(H)EVs, transient power, harmonics, or inverter and motor efficiency, the HIOKI PW3390
delivers outstanding performance and accuracy
Scalable multi-channel current logging: LR8101 & LR8102 Data Loggers
The LR8101 offers 12 power/current channels, while the LR8102 provides up to 120 power/current channels when linking multiple units with optical synchronization. Both support high-precision AC/DC measurements up to 2000 A using HIOKI’s ME15W-compatible sensors with auto recognition at a max. update interval of 5 ms.
Ideal DAQ-system for industrial power monitoring and HVAC performance testing, the LR8102 is perfect for multi-channel applications, while the LR8101 serves as a compact standalone solution.
Key features
- Scalable multi-channel logging – 12 channels (LR8101) or up to 120 channels for power, current and voltage logging
- High-precision AC/DC current measurement up to 2000 A with HIOKI current sensors
- High-Accuracy current and power logging with M7103
- Automatic sensor recognition
- High-speed data acquisition up to 5 ms
LR8102
LR8102 - Modular multi-channel Data Logger for system integration, optical sync, UDP, CAN
The versatile, modular data logger LR8102 can be used in combination with a variety of modules. It is therefore the perfect solution for integration in applications requiring multiple channels and recording intervals as short as 5 ms.
LR8101
LR8101 - Modular multi-channel Data Logger for system integration
Main unit for system integration applications, modular system, max. 300 voltage/temperature or 12 power channels, for high voltage/high current applications, max. update interval 5 ms, for 19” rack systems
High-speed current measurement + high versatility: MR6000 Memory Recorder
Capture every detail of your current signals with the MR6000 Memory Recorder, delivering high-speed, high-accuracy waveform recording. It pairs with HIOKI’s zero-flux sensors for precise current analysis and features auto sensor recognition, 200 MS/s sampling, and real-time processing. Its modular design is expandable delivering multi-parameter data acquisition.
Ideal for EVs, inverters, power electronics, and industrial diagnostics, this data recorder integrates voltage, frequency, acceleration and strain measurements for comprehensive testing.
Key features
- Up to 200 MS/s sampling for high-speed data acquisition
- 8 slots, up to 32 analog channels for expandable measurement capabilities
- Wide selection of 15 input & 3 output modules
- 12.1-inch capacitive touch screen for intuitive operation and enhanced analysis capabilities
- Direct measurement of up to 1000 VDC/700 VAC
MR6000
MR6000 - 32-channel modular memory recorder, 200 MS/s, 1000V, touchscreen
Modular memory recorder, up to 32 channels, max. sampling rate 200 MS/s, max 1000 VDC isolated direct voltage input, up to 256 GB storage with SSD option, intuitive user interface, touchscreen, real-time waveform calculation and real-time saving
Zero-Flux Current Sensors Explained: Like in “Back to the Future”?
Ever wondered how zero-flux current sensors work? This blog takes you behind the science of this cutting-edge technology - exploring its principles, applications, and why it might sound familiar. Check it out:
To the Blog
Do you remember the “flux capacitor” that Doc Brown invented in Back to the Future? It was the heart of the DeLorean, enabling time travel when powered with 1.21 GW of energy. While zero-flux current sensors won’t send you through time, they do use a fascinating principle that delivers unmatched accuracy in current measurement.
Are Fluxgate-based current clamps for you?
In a nutshell: Yes - if you aim for power measurements, you measure high currents up to 1000 A, and your bandwidth is not higher than 2 MHz, zero-flux current clamps based on fluxgate-technology are for you.
Watch this 1-minute video to get a quick breakdown of the key differences between fluxgate and Hall-based sensors.
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Do you need to measure current with more bandwidth?
For high-bandwidth measurement solutions up to 120 MHz with low currents starting from 200 µA, check out the HIOKI the Hall-based sensors.
Precise Current Clamps: Improve Your Applications
HIOKI current clamps enable precise, real-time measurement of high currents without disrupting setups, ensuring accuracy and efficiency in dynamic waveform analysis across key industries.
Power Electronics & Inverter Testing
Optimize inverter output and power conversion for renewable energy and industrial systems, ensuring high efficiency and stability.
Automotive & EV Testing
Evaluate battery current and motor drive efficiency in EVs and hybrids, ensuring WLTP & SAE J1634 compliance for optimized energy management.
Industrial Power Monitoring
Monitor high-current loads and AC/DC distribution in factories and heavy machinery, detecting anomalies and improving efficiency.
Circuit Testing & Low-Current Measurements
Capture precision micro-currents and circuit stability in compact electronics, analyzing power consumption for efficient design.
Battery & Power Supply Analysis
Assess charge/discharge cycles, load response, and transient behavior to ensure stable power delivery and extended battery life.