IEC 62037-5:2021 pdf download-Passive RF and microwave devices, intermodulation level measurement – Part 5: Measurement of passive intermodulation in filters.
Based upon these factors, measuring PIM from a filter assembly whilst it undergoes thermal or vibrational stresses is not currently recommended. A less vigorous form of dynamic testing should be performed on a filter assembly in order to demonstrate that stability of the PIM level is maintained after certain stresses have been applied. This style of dynamic test typically takes the form of striking the assembly with an instrument that will not damage the surface of the assembly. The impact of this tapping shall be at least that described in IEC 60068-2-75:201 4, Clause 7 for the 0,1 4 J drop, with conditions given in IEC 60068-2-75:201 4, Table 1 and Table 2, that is, a 0,25 kg striking element of polyamide (Rockwell hardness: 85 < HRR < 1 00) dropped from a height of 56 mm. The impact shall be applied as close as possible to each of the connectors of the filter, while still impacting the filter body. The impact near each connector shall be repeated three times. Also, for any side of the filter that has no connectors, three impacts shall be applied along one edge of that side. The shape of the striking element shall be the same as described in IEC 60068-2-75, for ≤ 1 J. An example, taken from IEC 60068-2-75:201 4, Annex A, is shown Figure 2.
Several examples of schematics are presented. Each figure corresponds to a particular test scenario as indicated in the matrix in Table 1 . It will be noted that some of the example schematics are modifications of the test configurations shown in IEC 62037-1 . These modifications allow the operator to satisfactorily perform a range of tests which are more specific to the requirement of filter assemblies. It is imperative that the residual PIM level of the test system be verified prior to measurement of the filter assembly. It is strongly recommended that this level be at least 1 0 dB below the PIM level requirement of the filter assembly, in order to minimize errors due to the system itself. This measurement can be carried out in the following example set-ups by excluding the DUT from the measurement system and monitoring the resultant PIM level under the normal test conditions. The only systems which deviate slightly from this are Figure 6 and Figure 9 and notes are provided for these two set-ups, indicating the test point at which the system residual intermodulation distortion can be measured with the DUT removed.