Oscilloscope current probeIt is an electronic detection tool used to measure the waveform of conductor currentHall effectandPrinciple of Electromagnetic InductionConverting current signals into voltage signals is widely used in fields such as motor drivers, switching power supplies, and new energy module current testing.

Working principle and technical parameters

Oscilloscope current probe based on‌Hall Effect and Electromagnetic Induction PrincipleRealize current measurement: Hall sensors detect the magnetic field generated by DC or low-frequency currents and output electromotive force, while electromagnetic induction coils process high-frequency AC current signals. Its core parameters include:

*‌Bandwidth RangeFrom DC to 50MHz, ensure that high-frequency signals are not distorted. ‌

*‌measurement accuracy± 1% (with calibrator), supports 15A DC superimposed AC current and 50A peak pulse current. ‌

*‌safety voltage‌：MAXBare wire voltage 300V (CAT Ⅰ level), suitable for high voltage environments. ‌

*‌output interface‌: StandardBNC interface, compatible with most oscilloscopes. ‌

Usage and Operation Guide

The correct use requires following the following steps to ensure accuracy and safety:

‌Connection and Calibration‌：

*Move the probeConnect the BNC interface to the oscilloscope channel to ensure power supply (external power supply is required for active probes).

*Execute demagnetization（DEMAG and zero adjustment operations are used to eliminate residual magnetic errors.

‌Measurement skills‌：

*When clamping the conductor, keep the clamp aligned to avoid signal distortion.

*When measuring low currents (such as milliampere level), multiple turns of conductor can be wrapped around the probe jaws to enhance sensitivity (e.g5 cycles increase sensitivity by 5 times.

‌signal analysis‌：

*Set the oscilloscope time base and vertical scale to make the waveform clear and centered.

*Combining voltage probe to calculate power: Oscilloscope uses mathematical operations (such as voltage)Output instantaneous power, apparent power, and other parameters based on current (x).

Brand and Model Comparison and Selection Suggestions

The mainstream models and applicable scenarios are as follows:

*‌TechTCP202/TCP305High precision (± 1%), bandwidth of 50MHz, suitable for semiconductor testing and analysis of electric vehicle charging stations.

*‌Dede TechnologyN2782BSupports 30A continuous current, 50MHz bandwidth, hybrid technology for both AC and DC measurement, suitable for industrial maintenance.

*‌Rohde&SchwarzRTM series matching probeSuitable for high-speed oscilloscopes, emphasizing anti-interference design, used for scientific research and complex signal diagnosis.

Attention should be paid to:

*‌Bandwidth matchingThe probe bandwidth should be greater than 2-3 times the signal frequency.

*‌current rangeRefer to the manufacturer's curve chart to avoid magnetic saturation (such as ampere second product limitation).

*‌Jaw sizeEnsure compatibility with the diameter of the tested wire, and the flexible probe is suitable for AC signals. ‌‌

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