This part of the Chinese automotive component test series describes the use of a transverse electromagnetic cell, adopted from the international method, and it is used in China mainly during the development of electronic control units, when a module must be assessed repeatedly and at low cost before the more expensive chamber testing is undertaken. The requirement is imposed through the component specifications of the vehicle manufacturers, which accept the cell method provided that the field uniformity across the test volume has been verified; the record of that verification is part of the evidence a supplier submits. Because the method is sensitive to the construction of the test harness and to the grounding of the module, the specification accompanying a Chinese project normally defines the harness length, the routing and the load to be used, and the report will be rejected if those conditions were not reproduced. The page identifies the Chinese designation under which the method is cited in domestic projects.