Standard Requirement
International electromagnetic compatibility standards establish uniform test procedures for evaluating the immunity of electrical and electronic equipment to radiated radio-frequency electromagnetic fields. Compliance with IEC 61000-4-3 demonstrates that a populated printed circuit board assembly operates without malfunction when exposed to commercial wireless signals and ambient radio frequency noise. The document defines stress levels and field uniformities required during anechoic chamber testing.
Test Methodology
Testing involves placing the equipment under test inside an anechoic chamber equipped with field-generating transmitting antennas. The standard specifies sweep speeds and step sizes across the 80 megahertz to 6 gigahertz frequency spectrum, applying amplitude modulation at 1 kilohertz with an 80 percent sine wave. Signal generators drive high-power radio-frequency amplifiers, directing uniform electromagnetic fields at four orientation faces of the circuit assembly.
Internal ground plane shielding, local decoupling capacitor selection and differential signal routing determine whether high-frequency noise demodulates inside sensitive analog signal chains. Test operators monitor device performance metrics continuously during exposure to detect functional upsets or communication errors.
Immunity Boundary
Passing criteria are classified into performance criteria ranging from uninterrupted normal operation to permanent damage requiring repair. Standard IEC 61000-4-3 establishes field strength severity levels typically set at 1, 3, 10 or 30 volts per meter depending on operating environments.
