Wideband DC to 50 MHz/30A AC/DC Current Probe for Oscilloscopes

SKU: 3273-50 Category:


Hioki flat bandwidth current probes are best-in-class current sensors for use with Memory HiCorders and high performance oscilloscopes. The 3273-50 offers a wide DC to 50 MHz bandwidth and 30A of continuous input, and is ideal for capturing transient current signals from switching power supplies, inverters, and motor controllers.



Key Features

• Highly accurate observation across a wide band from DC to MHz
• Connects directly to oscilloscope or Memory HiCorder BNC input terminal *1
• High S/N characteristics enable the measurement of 10 mA order current waveforms (3273-50, 3276)

*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.



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

Frequency bandwidth DC to 50 MHz (-3 dB)
Rise time 7 ns or shorter
Noise level 2.5 mA rms max. (bandwidth limited to 20 MHz)
Continuous allowable input 30 A rms (requires derating at frequency)
Max. allowable peak input 50 A peak (non continuous)
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 30 A rms)
±2 % rdg. (DC, 45 to 66 Hz, 30 A rms to 50 A peak)
Output rate 0.1 V/A (use with a device having a 1 MΩ input resistance or higher)
Measurable conductors Insulated conductor
Core diameter φ 5 mm (0.20 in)
Power supply ±12 V ±0.5 V, 5.6 VA max.
Dimensions and mass ±1.0 % rdg. ±1 mV f.s. (DC, 45 to 66 Hz, 0 to 30 A rms)
±2 % rdg. (DC, 45 to 66 Hz, 30 A rms to 50 A peak)
Sensor cable BNC terminal: 1.5 m (4.92 ft), Power cable: 1 m (3.28 ft)
Accessories Instruction manual ×1, Soft case × 1


Catalog: CURRENT PROBE series CT6700, CT6701, 3273-50, 3274, 3275, 3276

Technical Notes

Developing a Thin-film Low-noise Hall Element for Use in Current Probes

High-precision, Wideband, High Stable Current Sensing Technology

Declaration of Conformity

CLAMP ON PROBE 3273-50 [121KB]


Current sensors for the F/V Unit 8940

*To connect the current sensor via the conversion cable for the F/V Unit 8940, or using with the Power supply unit 9555-10.



To connect the 3273-50 and the 8940, Note: cannot be used with the 3274, 3275, 3276 to connect the 8940 via this cable 9319

Power supply

*Not necessary when using Current Unit 8971.



• For Hioki wide bandwidth current probes • Single sensor connectable


• For Hioki wide bandwidth current probes • Connect up to four sensors

There are no drivers, firmware or software available for this product.

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