500 A AC/DC 100kHz Wideband and High-Precision Current Probe for Power Efficiency Testing

Hioki AC/DC clamp sensors are best-in-class current sensors for use with power meters, Memory HiCorders and high performance oscilloscopes. The CT6845 is a high-precision 500 A AC/DC current probe that features a wide operating temperature range and large jaw diameter, making them ideal for evaluating the operational integrity of devices that are subject to extreme temperature ranges. A comment from the Good Design Award 2016 “The ergonomic design of these products appropriately reflects conditions in the field as well as worker needs through features such as one-handed operation and a grip that can be easily opened and closed in any orientation. In addition, they exhibit a high level of overall finish, including through the effective use of visual cues, for example use of yellow and gray to prompt the user to interact with the instrument in a way that avoids its inherent hazards.” Key Features • Ideal for use in environmental testing with broad -40˚C to 85˚C temperature range • High precision with a clamp-type design, ±0.3% amplitude accuracy, ±0.1° phase accuracy • Wide-bandwidth from DC to 100 kHz • Single-handed operation and robust locking mechanism • Reduced effects from magnetic fields, conductor position, and noise from nearby wires • For EV/HEV battery charge and discharge efficiency testing and inverter and power conditioner conversion efficiency evaluations

Model No. (Order Code)

CT6845 To Be Discontinued, 500 A AC/DC, PL23 terminal
CT6845-05 500 A AC/DC, ME15W terminal

Note: These products cannot be used alone. The optional SENSOR UNIT is required in order to supply power and connect the clamp to a Memory HiCorder or other instrument. Products can be directly connected to the compatible Power Meters and Power Analyzers.

Insulated conductor

High-accuracy current sensors ideal for use with oscilloscopes and power meters

Compared to current sensors that use Hall elements, flux gate type current sensors are not prone to measurement error caused by variations in the external temperature. In addition, they can measure extremely low input (current values) and current waveforms with phase that lags by 90° with a high degree of precision. The CT6840 Series AC/DC Current Probes are ideal for measuring power waveforms with a digital oscilloscope and power meters.

Ideal for thermostatic chambers and engine rooms

The CT6845 series is ideal for operational evaluations of devices inside equipment that is subject to extreme temperature changes, offering tough, high-precision testing thanks to its broad temperature characteristics and an operating temperature range of -40°C to 85°C. The clamp sensor's tough performance helps ensure you can make the measurements you need.

Minimal effect from conductor position

When using typical clamp sensors, careful attention must be paid to the position of the conductor being measured because a break in the magnetic core makes it difficult to obtain uniform characteristics around the entire circumference of the core. The CT6845 series leverages Hioki's core competency in current sensing technologies to deliver almost no effects from conductor position, letting you position the cable under test anywhere within the clamp and still achieve the defined accuracy.

Basic specifications (Accuracy guaranteed for 1 year, Post-adjustment accuracy guaranteed for 1 year)

Rated current 500 A AC/DC
Max. allowable input 1000 A rms (requires derating)
Frequency characteristics DC to 100 kHz
Phase: DC to 100 kHz
Amplitude and phase accuracy DC ±0.3 % rdg. ±0.02 % f.s. (Phase: Not defined)
DC < f ≤ 100 Hz ±0.3 % rdg. ±0.01 % f.s. (Phase: ±0.1°)
Defined to 100 kHz
Output voltage 4 mV/A
(voltage output with the Sensor Unit use with a device having a 1 MΩ input resistance or higher)
Core diameter φ 50 mm (1.97 in)
Operating temperature, humidity -40 °C to +85 °C (-40 °F to 185 °F), 80% RH or less (with no condensation)
Power supply ±11 V to ±15 V DC (Power suppled via the Sensor Unit, which supports 100 to 240 V AC)
Power consumption 7 VA max. (at 500 A/55 Hz, ±12 V power requirement)
Dimensions and mass 238 mm (9.37 in)W × 116 mm (4.57 in)H × 35 mm (1.38 in)D, 860 g (30.3 oz), cord length: 3 m (9.84 ft)
Accessories Instruction manual ×1, Mark bands ×6, Carrying Case

Compatible models...CT6845 (-05)

Compatible modelsCT6845CT6845-05
Power Analyzer PW6001, PW3390△ (Requires CT9900)OK
Power Analyzer 3390OK△ (Requires CT9901)
Power HiTester 3193 seriesOK△ (Requires CT9901)
Current Unit 8971△ (Requires the 9318)△ (Requires the 9318, CT9901)
F/V Unit 8940△ (Requires the 9318, 9705)△ (Requires the 9318, 9705, CT9901)

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Seminar Videos On Demand

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Seminar Schedule

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Catalog: AC/DC CURRENT PROBE CT6844-05, CT6845-05, CT6846-05 Download PDF  [2MB] English
Catalog: SENSOR UNIT CT9555, CT9556, CT9557 Download PDF  [1MB] English
Catalog: HIGH ACCURACY / WIDEBAND CURRENT SENSOR Series CT686x, CT687x, CT684x Download PDF  [6MB] English

User Guides

Electrical Measurements of Lithium-Ion Batteries Download PDF  [4MB] English
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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Drivers, Firmware

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Options A


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


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


• 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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Options B

The CT9903 connects up to 2 cables in series, Cannot be used in combination with the 9277 to 9279


Convert PL23 (10-pin) terminal to ME15W (12-pin) terminal

Options C

The CT9902 connects up to 2 cables in series


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


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

Options D

For connecting to the F/V Unit 8940 or Current Unit 8971


To connect the CT6841-6846, CT6865/63/62, 9709, 9272-10 to the 8971/40/51, 38 cm (14.96 in) length


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