IEC 62037-3:2021 pdf download – Passive RF and microwave devices, intermodulation level measurement – Part 3: Measurement of passive intermodulation in coaxial connectors.
4 Test method 4.1 Samples for testing One of the two following set-ups may be used. NOTE Correct assembly methods and techniques are critical to the proper operation of the connector on the cable. a) Set-up 1 – Multi-port DUT In order to minimize the effect of the transmission line, a short assembly should be tested. Identical connectors should be assembled at each end. An assembly, as short as physically practical, should be constructed. b) Set-up 2 – One-port DUT A single connector can be assembled on a length of transmission line for which it is designed that exhibits at least 1 0 dB of attenuation in one direction at the lowest frequency in the receive band. 4.2 Connection of unit The unit shall be connected as described in IEC 62307-1 . 4.3 Set-up 1 – Fixed frequency test considerations Due to the phase interaction of the connectors and the length of the transmission line (configuration A) when measured in the reverse (reflected) mode, the frequency at which maximum PIM occurs within the band can vary and shall be determined. An accepted method of sweeping is to fix f 1 at the low end of the transmit band and step f 2 down, starting at the top of the band for all combinations of frequencies that result in IM in the receive band. If desired, this procedure can be reversed by fixing f 2 at the highest frequency in the transmit band and then stepping f 1 up, starting at the bottom of the band.
If fixed frequency is used, assemblies of varying lengths shall be made to ensure that the PIM adds in-phase. Assemble two additional DUTs. The first one is to be λ/6 longer and the second one is to be λ/3 longer at the receive frequency of the test. The PIM of the three (3) assemblies is measured to determine which DUT exhibits maximum PIM. The impact test shall be performed on this DUT. Multiple fixed frequencies may be used in lieu of varying the cable length. The impact test is to be conducted at the frequency where the maximum PIM is measured. The cable used as a load shall be verified as having suitable PIM performance prior to being used in testing as measured by IEC 62037-4. 4.4 Set-up 2 considerations The cable used as a load shall be verified as having suitable PIM performance prior to being used in testing as measured by IEC 62037-4. 4.5 Impacts Mount the DUT as shown in Figure 1 . A minimum of five (5) impacts in accordance with Table 1 shall be applied. (See Figure 1 for impact set-up.) The drop mass is a steel ball, ensuring that no sharp edge will damage the DUT and minimizing variation in the impact force. The steel ball is remotely released via a solenoid to prevent impact force variation due to manual operation.