Considerations on the Dwell Time for a Vibrating Intrinsic Reverberation Chamber

The dwell time is an important factor when conducting a radiated immunity test and shall be compatible with the response time of the device under investigation. In mode-stirred reverberation chambers, like the vibrating intrinsic reverberation chamber, the electromagnetic field is continuously stirred by the flexible, vibrating walls of the cavity and the time duration of high-strength interferences is generally unknown. Therefore, concerns have arisen regarding the proportion of time that the electromagnetic field level spends at or above the target level during the test. This study investigates, through empirical and simulated data, the expected value of this time interval, considering a threshold level equals to the quantile-80% of the field samples distribution. This information is useful for the user of the method, when considering a mode-stirred reverberation environment for devices with a well-known response time.