Radiated Immunity Testing Services

RS Radiated Immunity Testing, also known as Radiated Sensitivity Testing, is one of the most fundamental EMS test items. It refers to the ability of various devices, equipment, or systems to resist radiation under conditions of electromagnetic radiation. The higher the sensitivity, the lower the immunity to interference. The test is generally conducted in a shielded room.

Test Standards

• IEC 61000-4-3, GB/T 17626.3 "Electromagnetic Compatibility - Testing and Measurement Techniques - Radiated Radio-Frequency Electromagnetic Field Immunity Test"

• CISPR 24, GB/T 17618 "Information Technology Equipment - Immunity - Limits and Methods of Measurement"

• CISPR 14-2, GB 4343.2 "Electromagnetic Compatibility Requirements for Household Appliances, Electric Tools, and Similar Appliances - Part 2: Immunity"

• IEC 61547, GB/T 18595 "Electromagnetic Compatibility Immunity for General Lighting Equipment"

RS Radiated Immunity Test

Test Equipment

• Signal Generator

• Power Amplifier

• Emission Antenna

• Field Strength Probe, etc.

Test Frequencies

• 80 MHz to 1 GHz / 1.4 GHz to 2 GHz / 2 GHz to 2.7 GHz

Suggestions for Improvement of RS Radiated Immunity Testing Related Issues

(1) Keeping fieldbus devices away from power-consuming equipment, and arranging fieldbus cables in separate cable trays from power cables, can effectively help prevent interference. Keeping a distance from the interference source is an important measure to prevent radiated interference.

(2) Use UPS power supplies or isolation transformers.

(3) Shielding of fieldbus devices and cables.

(4) In cases of long transmission distances and high interference, using optical fiber cables is recommended. Optical fibers effectively address many issues of radiated and conducted interference. When the ground conditions between two points are poor or when there is no common ground, using optical fiber for fieldbus signal transmission can effectively prevent ground loop interference. Between MCCs, there can often be ground potential differences or ground loops, so optical fibers are preferred over twisted-pair cables.

(5) A 12-pulse rectifier in the rectifier section can effectively eliminate the 5th and 7th harmonics. Power cables between the drive cabinet and the motor should always be well-shielded and use three-core balanced power cables.