IEC 62037-1:2012 is applicable to the general requirements and measuring methods for intermodulation (IM) level measurement of passive RF and microwave components, which can be caused by the presence of two or more transmitting signals. This first edition of IEC 62037-1 replaces IEC 62037, published in 1999. It constitutes a technical revision. This standard is part of the IEC 62037 series which addresses the measurement of PIM, but does not cover the long term reliability of a product with reference to its performance. This standard is to be used in conjunction with other appropriate part(s) of IEC 62037.