This standard specifies the shielding effectiveness requirements and testing methods for military electronic equipment general chassis cabinets within the frequency range of 10kHz to 1GHz. This standard is applicable to the testing of shielding effectiveness of empty chassis cabinets before the installation of electronic/electrical devices and components inside the chassis cabinets. 2. The relevant clauses in the following documents become the clauses of this standard through reference. Any reference document with a date or revision is not applicable to this standard, and any subsequent modifications (excluding corrected content) or revisions are not applicable. However, parties advocating the use of this standard are encouraged to explore the possibility of using its latest version. For referenced documents without date or revision, the latest version applies to this standard. GJB 72 Electromagnetic Interference and Electromagnetic Compatibility Terminology 3 Terms and Definitions GJB 72 establishes and the following terms and definitions apply to this standard. 3.1 Port: The specific interface between the tested device and the incident electromagnetic field- 3.2 Enter the physical location (point/port) on the electromagnetic protection body at the point of entry port of entry. If sufficient electromagnetic protection measures are not taken for the entry point (entry port), electromagnetic energy can enter or diffuse out of the chassis cabinet through it. According to the type of penetration, entry points (entry ports) are divided into hole entry points and wire entry points (entry ports); According to the general situations encountered in engineering design, entry points (entry ports) can also be divided into layout, mechanical, structural, and electrical entry points (entry ports). 3.3 Measurement range for testing the maximum shielding effectiveness that the system can test at each frequency point. In a specific system configuration state, if the unit of power is decibels, the difference in power received by the receiver during reference testing and background noise testing is the dynamic range of the system's testing. The dynamic range of testing not only depends on the performance and settings of the receiver (such as resolution bandwidth), but also on the level of the testing environment and the overall testing system
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