Shielding RoomWhat exactly is the correct operation process for the construction? Shanghai Serene take a look

First do the field investigation, and then design a good construction plan, and then arrange for construction personnel to enter the construction, the following specific introduction of specific operating procedures:

1. Make the best possible lap in each seam and discontinuity of the backplane and chassis. The degree of lapping plays a decisive role in shielding effectiveness of the shell, and when the shielding, ventilation and strength requirements are high and the quality is not harsh, the honeycomb plate is used to shield the vent, and the welding method keeps the line connected to prevent leakage.

2. When possible, seams should be welded. In the case of limited conditions, the use of spot welding, the distance between the riveting and screws to secure. When using screws or riveting to lap, should first in the middle of the seam, and then gradually extended to the ends to prevent metal surface bending, in the non-conductive liner, the screw spacing should generally be less than the high operating frequency of 1%, at least not more than 1/20 wavelengths;

3. Be aware of the extent to which the overall shielding effectiveness is reduced as a result of the cable passing through the enclosure. When the typical unfiltered conductor passes through the shield, the shielding efficiency is reduced by more than 30db; when the power cord enters the housing, it should pass through the filter box. The input end of the filter can be worn out of the shielding casing, if the filter structure should not be worn out of the casing, the power cord should be entered into the chassis for the filter set up a compartment;

4. The metal control shaft through the shield should be grounded with a metal contact, grounding nut, or RF pad. can also be used without grounding the metal shaft and with other shafts through, generally using a waveguide cutoff frequency than the high frequency of the round pipe to do the control shaft; it is important to pay attention to the shielding effectiveness when penetrating the metal shaft or wire in the cutoff waveguide hole;

5. In places where seams are uneven, or in movable panels, conductive pads or finger spring materials with high conductivity and elasticity must be used, ensuring that the tightening method has sufficient pressure to maintain surface contact in the case of deformation, shock, and vibration.