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 150 A of continuous high input, letting you capture transient current signals from switching power supplies, inverters, and motor controllers. The probe is designed with a high permeability magnetic shield to reduce the effects of electric fields, making it ideal for measuring low currents or nearby high-current lines.

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

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 probe's metal BNC terminal to a Memory HiCorder’s plastic BNC terminal may distort or damage the plastic terminal. To avoid damage, please connect and disconnect the probe cable straight to the BNC terminal of the waveform monitoring equipment.

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.

Basic specifications

Accuracy guaranteed: 1 year
Frequency bandwidth DC to 10 MHz (-3 dB)
Rise time 35 ns or shorter
Noise level 25 mA rms max. (bandwidth limited to 20 MHz)
Continuous allowable input 150 A rms (requires derating at frequency)
Max. allowable peak input 300 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 rate 0.01 V/A
(The output of this probe is internally terminated)
Measurable conductors Insulated conductor
Core diameter φ 20 mm (0.79 in)
Power supply ±12 V ± 1 V, 5.5 VA max.
Dimensions and mass 176 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)
Accessories Instruction manual ×1, Carrying case × 1

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