Classification of oscilloscope current probes

　　The oscilloscope current probe achieves accurate measurement of the current signal by testing the magnetic field signal generated by the current. Mainly used for measurement and analysis of conductor current. There are many types of current probes. The applications of this series of products are similar to those of current probes. They are both suitable for the measurement and analysis of current data in high-frequency situations. It is widely used. Its basic principle is that the current flowing through the wire will generate a magnetic field around it. It converts the magnetic field into a corresponding voltage signal. By cooperating with an oscilloscope, the corresponding current waveform can be observed. It is widely used in switching power supply, motor driver, electronic rectifier, new energy and other fields.

　　Classification of oscilloscope current probes:

　　Oscilloscope probes can be divided into passive probes and active probes according to whether power supply is required. According to the signal type to be measured, they can be divided into voltage probes, current probes, optical probes, etc. The so-called passive probe means that the entire probe is composed of passive components, including resistors, capacitors, cables, etc.; active probes generally have amplifiers inside, and the amplifiers need to be powered, so they are called active probes. The input impedance of high-impedance passive probes in oscilloscopes is high, but the bandwidth is not high. The bandwidth of low-impedance passive probes can be high, but the input impedance is not high.

　　The disadvantage of passive probes is that they cannot measure DC models, and the low-frequency cutoff point is usually above 100Hz. The advantage is low cost. Passive AC probes can be divided into split core and solid core according to the embedded head structure. The split-core insert can be opened and closed manually. The advantage is that the probe can be easily stuck on the conductor for measuring current. When the measurement is completed, the jaws can be opened and the probe can be moved to other conductors.

　　Active probes are divided into two types according to the common forms of jaws: one is an ordinary embedded structure, and the other is a flexible structure. Ordinary embedded structure current probes generally use iron cores made of strong magnetic materials. When such a large primary current flows, the iron core is prone to magnetic saturation, making accurate measurements impossible; while flexible probes use hollow cores. Type AC current sensor, so it is not saturated even under large current conditions, so flexible probes are generally used to measure large currents, and can only measure AC.