MIL-STD-188-125-1 Base Document:1998

FOREWORD
1 SCOPE
      1.1 Purpose
      1.2 Scope
      1.3 Applications
      1.4 Objectives
2 APPLICABLE DOCUMENTS
      2.1 General
      2.2 Government documents
             2.2.1 Specifications, standards, and
                      handbooks
             2.2.2 Other Government documents, drawings,
                      and publications
      2.3 Non-Government publications
      2.4 Order of precedence
3 DEFINITIONS
      3.1 Acronyms used in this standard
      3.2 Sources for definitions
      3.3 Definitions
             3.3.1 Aperture point-of-entry (POE)
             3.3.2 Conductive POE
             3.3.3 Continuous wave (CW) immersion
             3.3.4 Corrective maintenance
             3.3.5 Electromagnetic barrier
             3.3.6 Electromagnetic closure
             3.3.7 Electromagnetic stress (HM/HS)
             3.3.8 Facility HEMP shield
             3.3.9 HEMP acceptance test
             3.3.10 HEMP hardness
             3.3.11 HEMP hardness assurance
             3.3.12 HEMP hardness configuration baseline
             3.3.13 HEMP hardness critical item (HCI)
             3.3.14 HEMP hardness critical process (HCP)
             3.3.15 HEMP hardness maintenance (HM)
             3.3.16 HEMP hardness maintenance and hardness
                      surveillance (HM/HS)
             3.3.17 HEMP protection subsystem
             3.3.18 HEMP hardness surveillance (HS)
             3.3.19 HEMP hardness surveillance/
                      reverification testing
             3.3.20 Low-risk HEMP hardening
             3.3.21 Main barrier electrical POE protective
                      device
             3.3.22 Mission-critical systems (MCS)
             3.3.23 Norton equivalent circuit or Norton
                      source
             3.3.24 Penetrating conductor
             3.3.25 Penetration entry area
             3.3.26 Performance degradation
             3.3.27 Point-of-entry (POE)
             3.3.28 POE protective device or POE treatment
             3.3.29 Preventive maintenance
             3.3.30 Primary special electrical POE
                      protective device
             3.3.31 Protected volume
             3.3.32 Pulsed current injection (PCI)
             3.3.33 Residual internal stress
             3.3.34 Retrofit HEMP hardening
             3.3.35 Secondary special electrical POE
                      protective device
             3.3.36 Shielded enclosure leak detection system
                      (SELDS)
             3.3.37 Special protective measures
             3.3.38 Special protective volume
             3.3.39 Verification testing
             3.3.40 Vulnerability threshold (of an equipment)
             3.3.41 Waveguide below cutoff (WBC)
             3.3.42 Waveguide-below-cutoff array
4 GENERAL REQUIREMENTS
       4.1 General
              4.1.1 HEMP protection overview
              4.1.2 Integration with related requirements
       4.2 Hardness program overview
       4.3 HEMP hardening design
              4.3.1 Facility shield
              4.3.2 POEs
              4.3.3 MCS
              4.3.4 Special protective measures
       4.4 HEMP testing
              4.4.1 Quality assurance program
              4.4.2 Acceptance testing
              4.4.3 Verification testing
       4.5 HM/HS
              4.5.1 HM/HS program development
              4.5.2 HM/HS program implementation
5 DETAILED REQUIREMENTS
       5.1 HEMP protection subsystem topology
              5.1.1 Electromagnetic barrier topology
              5.1.2 Penetration entry area
       5.2 Penetration entry area
              5.2.1 Equipotential ground plane
              5.2.2 Grounding to the facility HEMP shield
       5.3 Facility HEMP shield
              5.3.1 Shielding effectiveness
              5.3.2 Shield configuration
              5.3.3 Shield monitoring capability
              5.3.4 Shield construction quality assurance
       5.4 Architectural POEs
              5.4.1 HEMP protection for architectural POEs
              5.4.2 Personnel entryways and exits
              5.4.3 Equipment accesses
              5.4.4 Acceptance testing for architectural
                       POE protective devices
       5.5 Mechanical POEs
              5.5.1 HEMP protection for mechanical POEs
              5.5.2 Piping POEs
              5.5.3 Ventilation POEs
              5.5.4 Acceptance testing for mechanical POE
                       protective devices
       5.6 Structural POEs
              5.6.1 HEMP protection for structural POEs
              5.6.2 Acceptance testing for structural POE
                       protective treatments
       5.7 Electrical POEs
              5.7.1 HEMP protection for electrical POEs
              5.7.2 Commercial electric power feeder POEs
              5.7.3 Other electrical power feeder POEs
              5.7.4 Audio and data line POEs
              5.7.5 Electrical control and signal line POEs
              5.7.6 RF communications antenna line POEs
              5.7.7 Conduit shielding
              5.7.8 Acceptance testing of main barrier
                       electrical POE protective devices
       5.8 Special protective measures
              5.8.1 MCS outside the main electromagnetic
                       barrier
              5.8.2 MCS inside the main electromagnetic
                       barrier
              5.8.3 Special protective volumes
              5.8.4 Acceptance testing of special
                       protective measures
       5.9 Reliability and maintainability
       5.10 Safety and human engineering
       5.11 Testability
       5.12 Corrosion control
       5.13 Configuration management
       5.14 Verification testing
              5.14.1 CW immersion testing
              5.14.2 PCI verification testing
              5.14.3 Verification for special protective
                      measures
       5.15 HM/HS program requirements
              5.15.1 HS/reverification test procedures
              5.15.2 Maintenance and inspection procedures
              5.15.3 Supply support requirements
              5.15.4 Training requirements
              5.15.5 Technical data
              5.15.6 Delivery
              5.15.7 Implementation
6 NOTES
       6.1 Intended use
       6.2 Issues of DoDISS
       6.3 Subject term (key word) listing
       6.4 Changes from previous issue
Figure 1 - Minimum HEMP shielding effectiveness requirements
           (measured IAW procedures of Appendix A)
Figure 2 - Typical waveguide and vestibule entryways
Figure 3 - Typical waveguide-below-cutoff POE protective
           devices
Figure 4 - Typical waveguide-below-cutoff array ventilation
           POE protective device
Figure 5 - Typical electrical POE protective device
Figure 6 - Typical special protective volumes
Table I - Injected pulse characteristics and residual internal
          stress limits for classes of electrical POEs
Table II - Maximum conduit length as a function of conduit
           outside diameter (OD)
APPENDIX A - SHIELDING EFFECTIVENESS (SE) TEST PROCEDURES
APPENDIX B - PULSED CURRENT INJECTION (PCI) TEST PROCEDURES
APPENDIX C - CONTINUOUS WAVE (CW) IMMERSION TEST PROCEDURES
CONCLUDING MATERIAL

Gives the minimum performance requirements for low-risk protection form mission-aborting damage or upset due to HEMP threat environments given in MIL-STD-2169. Also gives the minimum testing requirements for demonstrating that prescribed performance has been achieved and for verifying that the installed protection subsystem provides the operationally required hardness for the completed facility.

This standard prescribes minimum performance requirements for low-risk protection from mission-aborting damage or upset due to HEMP threat environments defined in MIL-STD-2169. This standard does not mandate specific design solutions to meet these performance-based requirement criteria. This standard also addresses minimum testing requirements for demonstrating that prescribed performance criteria have been achieved and for verifying that the installed HEMP protection subsystem provides the operationally required hardness for the completed facility. If the prescribed testing results in any hardware damage or functional upset, the operational authority for the facility will make the determination whether the observed event is mission aborting. Further, a hardness maintenance and hardness surveillance (HM/HS) program, including periodic reverification testing, is required to sustain the system survivability over its deployed life time.