Transverse Electro-Magnetic (TEM) cell for EMI and EMC testing. Also known as the Crawford Cell. The TEM cell is used to generate accurate electro-magnetic waves over a wide frequency range: DC (0 Hz) to several MHz. EM waves generated in the cell propagate in transverse mode and have the same characteristics as a plane wave. It can be used to calibrate E-field broadband probes for testing radiated E-field immunity as well as for measuring radiated emission from a product with a spectrum analyzer/EMI receiver.