Effects of shielding enclosures on the breakdown failure rate of electronic equipment

As a criterion of quality of a shield regarding its ability to protect electronic equipment against electromagnetic pulses, the breakdown failure rate of an operating test equipment with and without the shield can be compared [1]. In this contribution, the shielding behavior of cubical shields with varying rectangular slots against ultra wideband pulses of double exponential wave form is studied. It is found out, that applying the shield may have the effect, that electronic equipment becomes even more vulnerable to pulses due to resonance effects inside the enclosure. The results of these examinations in time domain are compared to results in frequency domain which can be found in literature [2].