Protection against radiation interferences
Protection against radiation interferences
Inotec regularly tests the shielding attenuation according to DIN IEC 62153-4-5 on reference hoods. The diagram on the following page shows the shielding attenuation values of different hood types in comparison. Two connector hoods of the same type were connected to each other in a coupling as test specimens. All hoods were equipped with identical connectors. The cable shield connection to the reference cable was carried out in accordance with the manufacturer’s specifications.
The measured value is the dissipation of the test specimen to the environment via the absorber measuring clamp. The reference base of 0 dB is set at the output level of an unshielded reference cable. An absorber clamp meter is then used to measure the power output of the test specimens. The shielding attenuation curves thus represent the difference between the dissipation in in relation to the values of the unshielded cable.
Comparative measurement on reference housings
The best attenuation values are shown by the shielded cable without connectors. The comparative measurements of the connector couplings clearly show that housings made of solid metal generally achieve a higher shielding quality compared to plastic, whereby metal-coated plastic housings have a lower attenuation than plastic housings with metal inserts. Looking at the measurement results of the full-metal housings, the advantages of the EMI/RFI shielding Inotec housing design in combination with the Inotec crimp flange compared to the measured benchmark housing become apparent. In addition, you can clearly see the effect of deep-drawn hood blankets on the Inotec MSX and MSBS series. Due to the almost flush closure with the mating connector housing in the test setup or a front panel in practical use, the dissipation to the environment can be significantly reduced again.
