Coaxial Test Procedure for Measuring RF Shielding Properties of SAE ARP 1705C EMI Gasket Materials

EUROLAB, with its state-of-the-art accredited laboratories and expert team, provides precise and fast testing services within the scope of SAE ARP 1705C testing. The purpose of this procedure is to establish a technique for reliably and repeatedly measuring the RF shielding properties of EMI gasket materials and EMI gaskets against various joint surfaces. The procedure is also used to test the reliability of sealed joint combinations after exposure to harsh environments.

The test method is intended to use only one transmission mode. A coaxial enclosure of the specified dimensions is used. Inside the enclosure is a fixed impedance and a plate in series with the center conductor. The gasket is placed between this plate and the housing and compressed with fasteners. The input signal is injected into the input connector through the impedance and seal and travels in a return path along the walls of the armature. There is a return current flowing through this seal and a voltage drop across it.

The magnitude of the current is calculated using the input power and impedance. The voltage drop across the gasket is obtained by measurement. These terms are used to calculate the transfer impedance of the sealed interface. This value can be expressed in dB of attenuation, or decreasing resistance per unit length indicates improved shielding properties.

EUROLAB assists manufacturers with SAE ARP 1705C test compliance. Our test experts, with their professional working mission and principles, provide you, our manufacturers and suppliers, the best service and controlled testing process in our laboratories. Thanks to these services, businesses receive more effective, high-performance and quality testing services and provide safe, fast and uninterrupted service to their customers.