Use filters to minimise interference on inputs and outputs to circuits and boards. These filters will work as a “barrier” between two zones.
Shielding is used to “isolate” the emission from a source by applying e.g. screen boxes and shielding materials. This method is often expensive and therefore used only when no other solution is working. However, you must remember that shielding can cause problems with temperature as well as with oxidation that might eventually degrade the shielding effect.
The EMC directive
The product must of course be tested for compliance with the existing EMC directive. What you often forget after the CE approval is what will happen with the product when it has been manufactured for some time. Often some parts of the product are changed (new components or component suppliers). This might cause the product getting EMC characteristics different from those it was approved for. In this case, the EMC scanner can also assist in performing emission tests to find out if any changes of the EMC characteristics have occurred.
To make a product as inexpensive and good as possible, you should consider EMC matters from the very beginning of the design. Pre-tests should be performed as early as possible, and problems should be corrected on component and board level.
Perform EMC test according to existing directives.
Perform tests during manufacturing to ensure that the EMC characteristics of the product are not degraded after some time.
“See it before you CE it”
* All measurements and pictures made by EMC-system RSE642, Detectus AB.