A new technique for shielding effectiveness measurements is the dual VIRC method. In this method two Vibrating Intrinsic Reverberation Chambers (VIRC) are combined together via a common wall with an aperture that forms the interface between them. This particular set-up makes it possible to achieve a very high dynamic range. Advantage of this technique compared to the nested reverberation set-up is that measurements can be conducted much faster and at much lower frequency. Several different approaches to determine the shielding effectiveness are presented. It has been shown that multiple interactions play a role in the particular set-up.

Reverberation chambers create a statistical uniformly distributed field which is very useful for shielding effectiveness measurements. Two adjacent reverberation chambers made of flexible cloth have been developed and are used for shielding effectiveness measurements. The field stirring is achieved by moving the (angle of) the walls. The common wall of the adjacent chambers forms the interface where many different types of materials and structures can be exposed to high field strength. Any leakage in the other chamber is reflected multiple times. This setup makes it possible to achieve a very high dynamic range. A main advantage of this technique compared to the nested reverberation set-up is that measurements can be conducted much faster, and at much lower frequency.

Reverberation chambers create a statistical uniformly distributed field which is very useful for reliable electromagnetic interference measurements. Another advantage of these chambers is the high field strength which can be generated compared to conventional test setups. A reverberation chamber made of flexible cloth is called a vibrating intrinsic reverberation chamber (VIRC) and the field stirring is achieved by moving the (angle of) the walls. A new technique for shielding effectiveness measurements is the dual-VIRC method. In this method two VIRCs are combined together via a common wall with an aperture that forms the interface between them. This set-up makes it possible to achieve a very high dynamic range. A main advantage of this technique compared to the nested reverberation set-up is that measurements can be conducted much faster and at much lower frequency.

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Testing of electrical and electronic equipment is generally performed using frequency domain tests like the IEC 61000-4-19. This standard covers the immunity to conducted, differential mode disturbances and signaling in the frequency range from 2 kHz to 150 kHz. Previous research describes several electromagnetic interference (EMI) cases in this frequency range, which cover pulsed, fast changing, current waveforms. For example cases are described where static energy meters can give misreadings when loaded with pulsed currents. Fast changing time domain signals are not covered by the standards. In this paper it is shown that the current frequency domain tests are not sufficient to determine the equipment's immunity, because of for instance non-linear effects, including saturation, digital sampling error effects and other non linear time invariant (LTI) effects.