EN/IEC 61000-4-9 Pulsed Magnetic Field Test: A Standard-Compliant Tool for Pulsed Magnetic Field Immunity Testing

Abstract
In the application environment of modern electronic and electrical equipment, electromagnetic interference (EMI) has become an increasingly prominent issue. As a typical source of electromagnetic interference, pulsed magnetic fields may lead to degraded equipment performance, functional failure, or even damage. To ensure the reliable operation of equipment in complex electromagnetic environments, pulsed magnetic field immunity testing has become a critical part of electromagnetic compatibility (EMC) testing for equipment. This paper focuses on the LISUN IMF61000-9 EN/IEC 61000-4-9 Pulsed Magnetic Field Test, conducting an in-depth analysis of its specialized design tailored to the characteristics and requirements of pulsed magnetic field immunity testing. It elaborates on the device’s performance advantages in full compliance with the IEC61000-4-9, EN61000-4-9, and GB/T17626.9 standards. Through an examination of its technical parameters, structural design, and functional features, this paper demonstrates the device’s significant value in the field of high-reliability testing, providing strong reference for EMC testing of electronic and electrical equipment.

1. Introduction
With the rapid development of electronic information technology, various electronic and electrical equipment have been increasingly widely used in fields such as industrial control, aerospace, medical electronics, and smart home. However, during operation, these devices are not only affected by internal electromagnetic signals but also exposed to complex external electromagnetic environments. Pulsed magnetic fields are one of the most harmful forms of interference. Generated by sudden changes in current, pulsed magnetic fields are characterized by fast rise time, high magnetic field strength, and short duration. They may interfere with sensitive components inside the equipment (such as integrated circuits, sensors, and relays), causing data errors, program malfunctions, hardware damage, and other issues that seriously threaten the normal operation and safety of the equipment.

To evaluate the ability of electronic and electrical equipment to resist pulsed magnetic field interference, the International Electrotechnical Commission (IEC), the European Committee for Standardization (CEN), and the Standardization Administration of China have respectively developed the IEC61000-4-9, EN61000-4-9, and GB/T17626.9 standards. These standards clearly specify the technical requirements, testing methods, and equipment performance indicators for pulsed magnetic field immunity testing. As the core equipment for conducting such tests, the performance of the EN/IEC 61000-4-9 Pulsed Magnetic Field Test directly determines the accuracy, reliability, and repeatability of test results. The IMF61000-9 EN/IEC 61000-4-9 Pulsed Magnetic Field Test developed and produced by LISUN Group is specifically designed based on the special needs of pulsed magnetic field immunity testing, strictly adhering to the above international and national standards. With advantages such as high intelligence, high stability, and ease of operation, it has become a preferred device for pulsed magnetic field immunity testing in the industry.

2. Characteristics and Requirements of Pulsed Magnetic Field Immunity Testing
2.1 Characteristics of the Test
Pulsed magnetic field immunity testing is mainly used to simulate the pulsed magnetic field interference that electronic and electrical equipment may encounter during operation, and to evaluate the equipment’s performance under such interference. Its core characteristics are reflected in the following aspects:
• Specificity of interference signals: The pulsed magnetic field generated during the test must have specific waveform parameters. According to standard requirements, the voltage waveform should meet 1.2/50μs (rise time of 1.2μs, half-peak time of 50μs), and the current waveform should meet 6.4/16μs (rise time of 6.4μs, half-peak time of 16μs). This waveform can truly simulate pulsed magnetic field interference generated in scenarios such as lightning induction and switch operations.
• Adjustability of magnetic field strength: Equipment in different application scenarios faces significantly different intensities of pulsed magnetic fields. The test needs to cover multiple test levels from low to high intensity to fully evaluate the equipment’s anti-interference capability. Standards require that the magnetic field strength can usually be adjusted to 3000A/m or above.
• Accuracy of the test process: Parameters such as the rise time, duration, and polarity of the pulsed magnetic field must be strictly controlled within the error range allowed by the standards (e.g., ±30% error for rise time and ±30% error for duration). At the same time, the trigger mode, interval time, and number of pulses should also be flexibly set according to test requirements to ensure the consistency and repeatability of test conditions.

2.2 Requirements for Testing Equipment
Based on the characteristics of pulsed magnetic field immunity testing, the following core requirements are put forward for the EN/IEC 61000-4-9 Pulsed Magnetic Field Test:
Compliance with standard specifications: The equipment must fully meet the technical requirements for pulsed magnetic field output waveform, intensity range, parameter accuracy, etc., specified in the IEC61000-4-9, EN61000-4-9, and GB/T17626.9 standards to ensure that the test results are recognized internationally and domestically.
• Stable and reliable performance: High-quality core components and advanced circuit design should be adopted to ensure the stability of the pulsed magnetic field output by the equipment during long-term continuous operation, and to avoid deviations in test results due to equipment performance fluctuations.
• Intelligent control and operation: A user-friendly human-machine interface should be provided, supporting both manual and automatic pulse trigger modes. Remote control can be realized through software or communication interfaces to simplify the test process and improve test efficiency.
• Flexible expandability and maintainability: A modular structure design should be adopted to facilitate later maintenance, upgrading, and function expansion of the equipment. Related components can be flexibly configured according to different test requirements, reducing the equipment’s usage cost and maintenance difficulty.

3. Design and Performance Advantages of the LISUN IMF61000-9 EN/IEC 61000-4-9 Pulsed Magnetic Field Test
As a high-reliability testing instrument specially designed for pulsed magnetic field immunity testing, the LISUN IMF61000-9 EN/IEC 61000-4-9 Pulsed Magnetic Field Test fully aligns with test requirements in terms of design concept, core technology, and functional configuration, and is fully compliant with the IEC61000-4-9, EN61000-4-9, and GB/T17626.9 standards. Its main design features and performance advantages are as follows:

3.1 Core Technology and Performance Parameters
The device strictly adheres to standard requirements in terms of pulsed magnetic field output performance, with precise and controllable key technical parameters. The specific parameters are shown in Table 1. It can be seen from the table that the core parameters of the IMF61000-9 EN/IEC 61000-4-9 Pulsed Magnetic Field Test, such as pulsed magnetic field output waveform, magnetic field strength range, rise time, and duration, all fully comply with standard regulations, and the parameter errors are controlled within the allowable range. This enables the device to provide accurate and stable test conditions for pulsed magnetic field immunity testing. For example, its magnetic field strength can be adjusted in the range of 0A/m to 3000A/m, meeting the needs of different test levels; the rise time is 6.4μs ± 30%, and the duration is 16μs ± 30%, ensuring that the time characteristics of the pulsed magnetic field are highly consistent with standard requirements; at the same time, it supports positive and negative polarity pulse output, which can simulate pulsed magnetic field interference of different polarities and comprehensively evaluate the anti-interference capability of the equipment.

In addition, the device’s maximum open-circuit voltage can reach 6.0KV, and the maximum short-circuit current can reach 3.0KA. Combined with a combined wave output impedance of 2Ω ± 0.25Ω, it can provide sufficient energy support for the generation of pulsed magnetic fields, ensuring the stable operation of the equipment under high magnetic field strength test conditions.
Table 1 Core Technical Parameters of LISUN IMF61000-9 EN/IEC 61000-4-9 Pulsed Magnetic Field Test

Parameter Name	Technical Index
Pulsed Magnetic Field Output Waveform	Voltage waveform: 1.2/50μs; Current waveform: 6.4/16μs
Magnetic Field Strength	0A/m ~ 3000A/m
Rise Time	6.4μs ± 30%
Duration Time	16μs ± 30%
Combined Wave Output Impedance	2Ω ± 0.25Ω
Maximum Open-Circuit Voltage	6.0KV
Maximum Short-Circuit Current	3.0KA
Polarity	Positive, Negative
Pulse Trigger Mode	Manual, Automatic
Pulse Interval	10s ~ 9999s
Number of Pulses	1 ~ 9999

3.2 Intelligent Control and Operation Design
Advanced control core: The device adopts an imported programmable high-voltage power supply, which has high-performance intelligent control capabilities. It can accurately adjust the output voltage and current, providing a reliable energy source for the stable generation of pulsed magnetic fields. At the same time, the programmable feature of the power supply allows the device to flexibly set output parameters according to test requirements, meeting the testing needs of different scenarios.

•  User-friendly human-machine interface: Equipped with a large-size color LCD touch screen, the interface is designed to be concise and intuitive. Operators can directly set parameters such as pulsed magnetic field strength, trigger mode, pulse interval, and number of pulses through the touch screen, and real-time monitor key data during the test (such as output voltage, current, magnetic field strength, etc.). The screen has built-in IEC standard test levels, allowing operators to directly call standard levels for testing without manually setting parameters repeatedly, which greatly simplifies the operation process.
•  Remote control function: The device is equipped with an RS232 communication interface and is matched with dedicated control software. Operators can connect to the device through a computer to achieve remote control. The remote control function not only allows operators to work in a location away from the test area to ensure personal safety but also supports integration with automated test systems, realizing collaborative work of multiple devices and automation of the test process, thereby improving test efficiency and data processing capabilities.

3.3 Modular Structure and Maintainability Design
The LISUN IMF61000-9 EN/IEC 61000-4-9 Pulsed Magnetic Field Test adopts a modular structure design, integrating the device’s core functions (such as high-voltage power supply module, pulse generation module, control module, display module, etc.) into independent modules respectively. This design has the following advantages:
•  Ease of maintenance: When a fault occurs in a certain module of the device, operators can quickly locate the faulty module and repair the device by replacing the module, without disassembling the entire device. This greatly shortens the maintenance time and reduces maintenance difficulty and costs.
•  Flexible expandability: As test requirements change, users can add or upgrade related modules according to needs (such as expanding a higher-power power supply module to increase magnetic field strength, or adding a data storage module to expand data recording capacity). There is no need to replace the entire device, which extends the service life of the device and improves its cost-effectiveness.
•  Stability guarantee: The modular design reduces mutual interference between various components inside the device. Each module can work stably in an independent environment, thereby improving the overall operational stability and reliability of the device and ensuring the accuracy of test results.

3.4 Standard-Compliant Test Compatibility
The LISUN IMF61000-9 EN/IEC 61000-4-9 Pulsed Magnetic Field Test takes the IEC61000-4-9, EN61000-4-9, and GB/T17626.9 standards as the core basis from the initial stage of design, and strictly adheres to the standard requirements in both hardware design and software functions. The device has passed testing and certification by relevant authoritative institutions, and its test results have good compatibility and recognition. It can be widely used in the R&D, production, and quality inspection links of electronic and electrical equipment. Whether for pulsed magnetic field immunity testing of industrial control equipment, medical instruments, automotive electronic components, or household appliances, this device can provide test conditions that comply with standards. It helps enterprises effectively evaluate the EMC performance of products, promptly identify problems in product electromagnetic compatibility, and provide strong support for product quality improvement and compliance certification.

4. Application Scenarios and Practical Value
4.1 Main Application Scenarios
With its excellent performance and standard compatibility, the LISUN IMF61000-9 EN/IEC 61000-4-9 Pulsed Magnetic Field Test has been widely used in pulsed magnetic field immunity testing in multiple fields:
•  Industrial control field: Industrial control equipment (such as PLCs, frequency converters, sensors, etc.) is prone to pulsed magnetic field interference generated by motor start-stop and switch operations when running on industrial sites. Using this device can simulate the pulsed magnetic field environment of industrial sites, test the operational stability of control equipment under interference, and ensure the continuous and reliable industrial production process.
•  Medical electronics field: Medical equipment (such as electrocardiographs, ultrasonic diagnostic instruments, monitors, etc.) is extremely sensitive to electromagnetic interference. Pulsed magnetic field interference may lead to inaccurate measurement data of the equipment, affecting medical diagnosis results. This device can be used for pulsed magnetic field immunity testing of medical equipment to ensure the safety and effectiveness of medical equipment in clinical use.
•  Automotive electronics field: There are a large number of electronic control systems inside automobiles (such as engine control systems, body control systems, airbag systems, etc.). During vehicle operation, components such as the ignition system and motors will generate pulsed magnetic field interference. Testing the anti-interference capability of automotive electronic components through this device can prevent the failure of automotive control systems due to electromagnetic interference and ensure driving safety.
•  Household appliance field: Household appliances (such as washing machines, air conditioners, microwave ovens, etc.) may be affected by external pulsed magnetic fields (such as lightning induction) during use, which affects the normal operation of the equipment. Using this device to conduct pulsed magnetic field immunity testing on household appliances can improve the electromagnetic compatibility performance of products, reduce the probability of failures, and enhance the user experience.

4.2 Practical Value
•  Assisting enterprises in product compliance certification: Against the background of global trade integration, electronic and electrical products need to pass EMC certification (such as EU CE certification, China CCC certification) in the target market to enter the market. The LISUN IMF61000-9 EN/IEC 61000-4-9 Pulsed Magnetic Field Test complies with international and national standards, and can provide test conditions that meet certification requirements for enterprises. It helps enterprises successfully pass EMC certification, break trade technical barriers, and expand market space.
•  Improving product quality and reliability: In the product R&D stage, using this device to conduct pulsed magnetic field immunity testing can help identify defects in product electromagnetic compatibility design in advance, such as improper component selection, unreasonable grounding design, and insufficient shielding measures. Enterprises can make targeted improvements based on test results, improve product quality and reliability from the source, and reduce the failure rate and after-sales costs of products after they are put on the market.
•  Promoting technological progress in the industry: The R&D and application of this device reflect China’s technical level in the field of pulsed magnetic field testing equipment. Its performance indicators and intelligent design concepts that comply with international standards provide an advanced testing solution for the industry. It helps promote the development of electromagnetic compatibility testing technology in China’s electronic and electrical industry and improve the overall product quality and competitiveness of the industry.

5. Conclusion 
As a key means to ensure the electromagnetic compatibility of electronic and electrical equipment, pulsed magnetic field immunity testing imposes strict requirements on the performance and standard compatibility of testing equipment. The LISUN IMF61000-9 EN/IEC 61000-4-9 Pulsed Magnetic Field Test fully meets the characteristics and requirements of pulsed magnetic field immunity testing through its precise technical parameter design, intelligent control functions, and modular structure layout. It is fully compliant with the IEC61000-4-9, EN61000-4-9, and GB/T17626.9 standards, providing a high-reliability solution for EMC testing of electronic and electrical equipment. The wide application of this device in the fields of industrial control, medical electronics, automotive electronics, and household appliances not only helps enterprises achieve product compliance certification and quality improvement but also plays an important role in promoting technological progress in the industry.

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