1. When the shielding, ventilation and strength requirements are high and the quality is not harsh, the honeycomb vents are used to shield the vents, and the wires are connected by welding to prevent leakage. When it is not possible to shield the indicator/display from the rear and filter the leads, use a metal mesh or conductive glass that is continuously connected to the chassis to shield the front of the indicator/display. As much as possible, add a shield behind the indicator and display, and filter all leads with a feedthrough capacitor.
2. When the signal line and control line enter/out the case, pass the appropriate filter. Multi-core connectors with filter pins are suitable for this application. Pay attention to the extent to which the overall shielding effectiveness is reduced due to the passage of the cable through the casing. When a typical unfiltered wire passes through the shield, the shielding effectiveness is reduced by more than 30db.
3. When the power cord enters the chassis, all should pass through the filter box. The input end of the filter can pass out to the outside of the shielding case; if the filter structure is not suitable to be worn out of the casing, a compartment should be set for the filter in the power cable to enter the casing. It must be noted that the shielding effectiveness is severely reduced when the metal shaft or wire is penetrated through the cut-off waveguide hole. Add a metal cap to the fuse, jack, etc.
4. When it is required to use the metal control shaft insulated to the ground, a short recessive control shaft can be used. When it is not adjusted, it can be covered with a nut or a metal gasket elastic mounting cap. The metal control shaft that passes through the shield should be grounded with a metal contact, ground nut or RF pad. It is also possible to use a metal tube having a grounding cutoff frequency higher than the operating frequency as a control shaft without using a grounded metal shaft.