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Abstract

Effective EMC compliance requires rigorous validation of product immunity against conducted RF disturbances. The GB/T 17626.6-2017 Conducted RF Immunity Test for EMC Compliance – LISUN RFCI61000-6 series offers a fully integrated solution for performing these critical assessments. This article provides a technical deep-dive into the system’s architecture, covering its dual power variants (35W and 85W), multi-mode injection methods, and compatibility with CDNs and EM clamps. Designed to meet the stringent requirements of IEC 61000-4-6 and GB/T 17626.6, this system provides engineering teams with a reliable, automated platform for precise interference injection, ensuring product reliability across demanding industrial, medical, and consumer electronics applications.

1.1 Integrated Signal Source and Power Amplifier Module

The RFCI61000-6 series departs from modular, rack-based configurations by integrating the signal source, power amplifier, and power meter within a single chassis. This design minimizes cable losses and impedance mismatches common in external generator-amplifier setups. The internal signal source provides a frequency range from 150 kHz to 230 MHz, covering the complete spectrum required by the base standard. The direct coupling between the synthesizer and amplifier ensures low phase noise and accurate amplitude stability at the injection point.

1.2 Dual Power Variants: 35W and 85W Configurations

Two distinct variants address different compliance testing scenarios. The RFCI61000-6-35W model delivers a saturated output power of 35 watts, sufficient for most commercial and light industrial EUTs. The RFCI61000-6-85W model offers 85 watts, providing the necessary headroom for testing high-current devices or applications requiring higher forward power to overcome CDN insertion losses. Both variants maintain a low VSWR, typically below 1.5:1 across the operational bandwidth, which protects downstream equipment and ensures efficient power transfer.

1.3 Touchscreen Interface and Automated Compliance Workflow

The system features a high-resolution touchscreen interface that replaces traditional physical controls and display panels. This software layer provides pre-configured test routines based on the selected standard (IEC 61000-4-6 or GB/T 17626.6). Operators can select injection methods, define frequency stepping parameters, and set dwell times directly. The integrated automation capabilities reduce manual intervention, allowing for repeatable, documented test sequences critical for compliance reporting.

2.1 Alignment with IEC 61000-4-6 and EN 61000-4-6

The RFCI61000-6 series is engineered to meet the fundamental requirements of IEC 61000-4-6:2008, which defines the immunity test for conducted disturbances induced by radio-frequency fields. The system is also fully compatible with the European standard EN 61000-4-6, which is harmonized under the EMC Directive 2014/30/EU. This alignment ensures that test results are recognized under CE marking schemes without modification or additional validation.

2.2 Specific Compliance with GB/T 17626.6-2017

For the Chinese market, the system adheres to GB/T 17626.6-2017, the national standard equivalent to IEC 61000-4-6. This standard specifies frequency ranges, test levels (e.g., Level 1: 1Vrms, Level 3: 10Vrms), and injection methods. The system’s dual-power architecture allows for precise leveling at each test frequency, ensuring compliance with Clause 5.2 of GB/T 17626.6, which mandates a 27 kHz tone for 80% amplitude modulation.

2.3 Injection Method Selection per Standard Clauses

According to Clause 5.1 of IEC 61000-4-6, the choice between CDNs, EM clamps, and BCI probes depends on cable length, EUT configuration, and port characteristics. The RFCI61000-6 system supports all three methods. The integrated power meter provides real-time forward and reflected power monitoring, a requirement for ensuring that the injected disturbance voltage is within the defined tolerance of +0 dB to -1 dB as specified in Clause 6.2.1 of the standard.

3.1 Output Power and Voltage Range

The system’s performance is defined by its ability to maintain a stable output voltage across a 50-ohm load. The 85W variant can drive injection levels well above the standard test level of 10Vrms, including the required over-test margin typically specified in product-specific standards.

3.2 Modulation Capabilities

The internal generator supports 1kHz sine wave amplitude modulation at 80% depth, as specified in the base standard. Additionally, the system supports pulse modulation for specialized testing, such as that required for medical devices per IEC 60601-1-2. The modulation depth is software-controlled and continuously monitored to ensure it remains within the standard’s tolerance of ±5%.

Technical Comparison: RFCI61000-6 Series Models

4.1 CDN Compatibility and Selection

The system interfaces directly with standard Coupling/Decoupling Networks such as the CDN-M1 (for AC mains power), CDN-AF2 (for signal lines), and CDN-M3 (for three-phase power). The RFCI61000-6 series provides a stable 50-ohm output impedance standard, which is the required source impedance for most CDNs. The 85W variant is particularly advantageous when testing through high-loss CDNs where 45 dB insertion losses are observed.

4.2 EM Clamp and Bulk Current Injection

For applications where direct galvanic connection is not possible, such as on shielded cables or high-speed data lines, the system integrates seamlessly with EM clamps and BCI probes. The high output power ensures that a sufficient disturbance current is induced on the cable bundle even at lower frequencies (150 kHz – 1 MHz), which is a common challenge for low-power generators. The system’s power meter monitors the current induced by the clamp to ensure compliance with the standard.

5.1 LED Manufacturing and Lighting Systems

LED drivers are susceptible to conducted RF interference due to their switching power supplies. The system is capable of testing these drivers per the requirements of EN 55015 (emission) and EN 61547 (immunity). The high-power variant is essential for testing large LED arrays or modules with long cable runs, ensuring that the disturbance voltage is maintained across the entire cable section.

5.2 Medical Device Compliance

Medical devices must comply with IEC 60601-1-2, which requires conducted RF immunity testing at higher test levels (e.g., 10 Vrms, 80% AM). The system’s precise leveling algorithm ensures that the injection voltage does not exceed +1 dB, which could harm sensitive patient-connected electronics. The pulse modulation capability is critical for testing life-support equipment and surgical tools.

5.3 Industrial Control and Renewable Energy Systems

In industrial environments, PLCs, motor drives, and charging stations for electric vehicles must withstand harsh electromagnetic conditions. The system is used to validate the EIRP of the coupling path per GB/T 17626.6 for power inverters and battery management systems. The 85W model provides the necessary power for testing three-phase inverters where high-capacitance line filters drastically reduce the effective coupling efficiency.

6.1 Forward Power and Reflected Power Monitoring

Accurate testing requires minimizing the VSWR between the amplifier and the CDN/EUT. The system provides a dedicated forward and reflected power readout. This monitoring allows engineers to calculate the actual power delivered to the load, which is critical for establishing the required test voltage (e.g., 10 Vrms) as defined in Clause 6.2 of IEC 61000-4-6.

6.2 Closed-Loop Leveling Algorithm

The system employs a closed-loop leveling algorithm that adjusts the amplifier gain based on real-time power readings from the internal power meter. This algorithm compensates for frequency-dependent losses in the CDN cabling. The user can set a target open-circuit voltage, and the system automatically calculates the necessary forward power, ensuring that the field calibration steps described in Annex A of the standard are performed correctly and recorded for the test report.

7.1 Reduced Test Setup Complexity

By integrating the signal source and amplifier, the system eliminates the need for an external signal generator, separate power amplifier, and a vector network analyzer for path calibration. This integration reduces the number of potential failure points and significantly improves the time to first measurement without sacrificing measurement accuracy.

7.2 Thermal Management and Duty Cycle

The 85W variant incorporates a forced-air cooling system with a high-velocity fan and aluminum heatsinks. The system is rated for continuous operation at full power (100% duty cycle) at room temperature without derating. This capability is crucial for long-duration sweeps covering 150 kHz to 230 MHz with specific dwell times at each frequency point, as required for many product-specific tests.

The LISUN RFCI61000-6 series represents a significant engineering advancement for GB/T 17626.6-2017 Conducted RF Immunity Test for EMC Compliance – LISUN. Its integrated design redefines operational efficiency, while the dual power options provide the flexibility needed for diverse EUTs and industry standards. The low VSWR, comprehensive injection method support, and user-friendly automated interface deliver precise, repeatable testing results. By adhering strictly to the specifications of IEC 61000-4-6, EN 61000-4-6, and GB/T 17626.6, the system provides a reliable path to compliance for manufacturers of systems ranging from LED lighting to critical medical devices, validating the robustness of product designs against RF interference.

Q1: How does the LISUN RFCI61000-6 series ensure compliance with the modulation requirements of IEC 61000-4-6?
A: The system directly addresses Clause 6.2 of IEC 61000-4-6, which specifies the use of an 80% amplitude modulation depth with a 1 kHz sine wave. The internal signal source generates this modulation accurately without external function generators. The system’s software monitors the modulation index in real-time to ensure it remains within the specified tolerance. Furthermore, the 85W variant supports a pulse modulation mode at a 1 kHz repetition rate, which is required by many product-specific standards for testing equipment that may be sensitive to pulsed interference, such as medical devices.

Q2: What is the practical difference between choosing the RFCI61000-6-35W and the RFCI61000-6-85W model?
A: The primary difference lies in the test margin and the ability to handle high-insertion-loss test setups. The 35W model is sufficient for testing small EUTs using standard CDNs (e.g., CDN-M1) at test levels up to 10 Vrms. The 85W model is recommended for testing large equipment with long, shielded cables using EM clamps or BCI probes, or for testing three-phase equipment via CDN-M3/16A where insertion losses commonly exceed 25 dB. The 85W model provides a significant headroom (often >20 dB) above the required test level, ensuring the test voltage is stable even when the EUT’s impedance varies across the frequency band.

Q3: Can this system be used for testing according to GB/T 17626.6-2017 specifically, and how does it differ from the IEC version?
A: Yes, the system is fully compliant with GB/T 17626.6-2017, which is the Chinese national standard adaptation of IEC 61000-4-6. The core technical requirements (frequency range, test levels, injection methods) are identical. The system’s software includes a dedicated test profile for the Chinese standard. The key practical difference for the operator is often in the preferred test level selection and reporting format. The LISUN system allows users to select the specific national standard variant from a menu, which automatically applies the correct calibration factors and test parameter limits.

Q4: What is the typical calibration procedure for maintaining the accuracy of the RFCI61000-6 system?
A: The system includes an internal calibration pathway. For traceable accuracy, the recommended annual external calibration involves validating the output power at the N-type connector using a certified power meter. The built-in power meter must be calibrated against a reference standard. The system also supports a user-performed “path calibration” routine, described in Annex A of the standard. This routine involves measuring the insertion loss of the specific CDN and cable setup used for a test. The closed-loop leveling algorithm then automatically compensates for these losses, ensuring the correct disturbance voltage is injected at the EUT port. This path calibration must be performed for each test configuration.