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



Model No. (Order Code)

3273-50DC to 50 MHz, 30 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.



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 bandwidthDC to 50 MHz (-3 dB)
Rise time7 ns or shorter
Noise level2.5 mA rms max. (bandwidth limited to 20 MHz)
Continuous allowable input30 A rms (requires derating at frequency)
Max. allowable peak input50 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 rate0.1 V/A (use with a device having a 1 MΩ input resistance or higher)
Measurable conductorsInsulated conductor
Core diameterφ 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)
AccessoriesInstruction 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




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

Power supply

*AC adapter is bundled with the LR8410-20, LR8510/8511, LR8450, LR8450-01



• For Hioki wide bandwidth current probes • Single sensor connectable

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