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Wideband Current Probe for Oscilloscopes

Hioki flat bandwidth current probes are best-in-class current sensors for use with Memory HiCorders and high performance oscilloscopes. The 3274 supports wide DC to 10 MHz bandwidth signals and 150A of continuous high input, and is ideal for capturing transient current signals from switching power supplies, inverters, and motor controllers. Key Features • Waveform observation across a wide band from DC to MHz • Connects directly to oscilloscope or Memory HiCorder BNC input terminal *1 *1 Connecting the device’s metal BNC terminal to a Memory HiCorder’s plastic BNC terminal may damage the plastic terminal or cause it to become misshapen.

Model No. (Order Code)

3274 DC to 10 MHz, 150 Arms

Note: Use the Power Supply 3269/3272 for general measurements or when power is not available from the Memory Hicorder. When performing continuous measurements, be aware of offset voltage drift.

Insulated conductor

Basic specifications (Accuracy guaranteed for 1 year, Post-adjustment accuracy guaranteed for 6 months)

Frequency bandwidthDC to 10 MHz (-3 dB)
Rise time35 ns or shorter
Noise level25 mA rms max. (bandwidth limited to 20 MHz)
Continuous allowable input150 A rms (requires derating at frequency)
Max. allowable peak input300 A peak (non continuous)
500 A peak (pulse width: 30 μs or shorter)
Amplitude accuracy (30 min. after power-on, after degaussing and zero-adjustment)±1.0 % rdg. ±1 mV f.s. (DC, 45 to 66 Hz, 0 to 150 A rms)
±2.0 % rdg. (DC, 45 to 66 Hz, 150 A to 300 A peak)
Output rate0.01 V/A *Device output is terminated internally. Use with a device having a 1 MΩ input resistance or higher.
Measurable conductorsInsulated conductor
Core diameterφ 20 mm (0.79 in)
Power supply±12 V ± 1 V, 5.5 VA max.
Dimensions and mass176 mm (6.93 in)W × 69 mm (2.72 in)H × 27 mm (1.06 in)D, 500 g (17.6 oz)
Sensor cable BNC terminal: 2 m (6.56 ft), Power cable: 1 m (3.28 ft)
AccessoriesInstruction manual ×1, Carrying case × 1

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IEEE Industrial Expo - Acapulco, Mexico

Jul 15, 2018 - Jul 20, 2018

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Jun 13, 2018 - Jun 15, 2018

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Jun 13, 2018 - Jun 15, 2018


Catalog: CURRENT PROBE series CT6700, CT6701, 3273-50, 3274, 3275, 3276 Download PDF  [3MB] English

User Guides

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Instruction Manual English

Outline Drawings


Declaration of Conformity


Drivers, Firmware

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• Up to 4 current sensors connectable

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• Single sensor connectable

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