New screened room techniques for the measurement of RFI

The electromagnetic field measured in a screened room is dependent on the size and geometry of the room, the type of source (electric or magnetic dipole) and the dipole moment. In this paper, computer models based on TEM wave propagation within a screened room are used to describe the fields measured from a source inside the room. The models are used to predict the results of changes in the test set-up which enable qualitative measurements of the dipole type and moment to be undertaken.