IEEE 299-2006: Measuring The Effectiveness Of Electromagnetic Shielding Enclosures

Like similar shielding effectiveness standards, the IEEE 299-2006 standard is specifically for enclosures. Any classification of the enclosure may apply. However, the enclosure must serve a purpose to shield from exterior electric or magnetic fields or protect the environment around itself from the effect of an interior electric or magnetic field.

Usually, the enclosure is constructed of metal with guidelines for continuous electrical contact between joining panels (i.e., doors). Examples for specific enclosures include single-shield or double-shield structures of various construction (i.e., bolted demountable, welded, or integral with a building) made of materials (e.g., steel plates, copper/aluminum sheets, screening, hardware cloth, metal foil, or shielding fabrics).

The required frequency range for the shielding effectiveness test must include the span from 9 kHz to 18 GHz. Nonetheless, this can be extended to cover frequencies down to 50 Hz and up to the maximum up to 100 GHz.

Scope of IEEE 299 Shielding Effectiveness

Testing to IEEE 299 requires placing transmitting and receiving loops approximately 0.3 m from the respective shielding barrier. The generator output is maintained at the level used during the reference measurement and is applied at each frequency and location.

During all low-frequency measurements, one loop remains in a fixed position and the second loop is repositioned and displaced to seek a worst-case measurement. The maximum indication of the detector reading shall be used for determining the shielding effectiveness.

The test setup is the same as other shielding effectiveness, with the determination of the dynamic range and the actual measurement of the signal for the sample in question.

Expert IEEE Shielding Effectiveness Testing

Keystone Compliance has the capabilities to test any size of enclosure to IEEE-299. We have tested large items such as entire on-site installation buildings and small items that can be easily transported to our lab. In addition to IEEE 299 testing, Keystone Compliance has an extensive test scope including IP code, vibration, wireless, and packaging.

Are you ready to partner with Keystone Compliance to determine the shielding effectiveness of your product when tested to the requirements of IEEE 299-2006? Let’s get started!