DEPARTMENT OF DEFENSE INTERFACE STANDARD

1 NOTE: This draft, dated 2 March 2015 prepared by AF 11, has not been approved and is subject to modification. METRIC DO NOT USE PRIOR TO APPROVAL (Project EMCS-6635-2015-002) MIL-STD-451G DRAFT SUPERSEDING MIL-STD-461F 10 December 2007 DEPARTMENT OF DEFENSE INTERFACE STANDARD REQUIREMENTS FOR THE CONTROL OF ELECTROMAGNETIC INTERFERENCE CHARACTERISTICS OF SUBSYSTEMS AND EQUIPMENT AMSC #### AREA EMCS DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited. MIL-STD-461G DRAFT DATED 2 MARCH 2015 FOREWORD 1.

2 This STANDARD is approved for use by all Departments and Agencies of the DEPARTMENT of DEFENSE . 2. The stated INTERFACE requirements are considered necessary to provide reasonable confidence that a particular subsystem or equipment complying with these requirements will function within their designated design tolerances when operating in their intended electromagnetic environment (EME). The procuring activity should consider tailoring the individual requirements to be more or less severe based on the design features of the intended platform and its mission in concert with personnel knowledgeable about electromagnetic compatibility (EMC) issues affecting platform integration.

3 3. An appendix is included which provides the rationale and background for each requirement and verification section. 4. A committee consisting of representatives of the Army, Air Force, Navy, other DoD agencies, and industry prepared this document. 5. Comments, suggestions, or questions on this document should be addressed to AFLCMC/ENRS, Bldg 28, 2145 Monahan Way, Wright-Patterson AFB OH 45433-7017 or emailed to Since contact information can change, you may want to verify the currency of this address information using the ASSIST Online database at ii MIL-STD-461G DRAFT DATED 2 MARCH 2015 CONTENTS PARAGRAPH PAGE FOREWORD.

4 Ii 1. SCOPE .. 1 Purpose.. 1 Application.. 1 General applicability.. 1 Tailoring of requirements.. 1 Structure.. 1 Emission and susceptibility designations.. 1 2. APPLICABLE 2 General .. 2 Government documents.. 2 Government documents, drawings, and publications.. 2 Non-Government publications.. 2 Order of precedence.. 3 3. DEFINITIONS .. 4 General.. 4 Above deck.. 4 Below deck.. 4 Exposed below deck.. 4 External installation.. 4 Flight-line equipment.. 4 Internal installation.

5 4 Metric units.. 4 Non-developmental item (NDI).. 4 Safety critical.. 5 Test setup boundary.. 5 Acronyms used in this STANDARD .. 5 4. GENERAL REQUIREMENTS .. 6 General.. 6 INTERFACE requirements.. 6 Joint procurement.. 6 Filtering (Navy only).. 6 Self-compatibility.. 6 Non-developmental items (NDI).. 6 Commercial items (CI).. 6 Selected by contractor..6 Specified by procuring activity..6 Procurement of equipment or subsystems having met other EMI requirements.. 6 Government furnished equipment (GFE).

6 7 Switching transients.. 7 Interchangeable modular equipment .. 7 iii MIL-STD-461G DRAFT DATED 2 MARCH 2015 CONTENTS PARAGRAPH PAGE Verification requirements.. 7 Measurement tolerances.. 7 Shielded enclosures.. 8 Radio Frequency (RF) absorber material.. 8 Other test sites.. 8 Ambient electromagnetic level.. 8 Ground plane.. 8 Metallic ground plane.. 8 Composite ground plane.. 9 Power source impedance.. 9 General test precautions.. 9 Accessory equipment.. 9 Excess personnel and equipment.

7 9 Overload precautions.. 9 RF 9 Shock hazard..10 Federal Communications Commission (FCC) restrictions..10 EUT test configurations..10 EUT design status..10 Bonding of EUT..10 Shock and vibration isolators..10 Safety grounds..10 Orientation of EUTs..10 Construction and arrangement of EUT cables..10 Interconnecting leads and cables..11 Input (primary) power leads..11 Electrical and mechanical interfaces..11 Operation of EUT..12 Operating frequencies for tunable RF equipment..12 Operating frequencies for spread spectrum equipment.

8 12 Susceptibility monitoring..12 Use of measurement equipment..12 Detector..12 Computer-controlled instrumentation..13 Emission testing..13 Bandwidths..13 Emission identification..14 Frequency scanning..14 Emission data presentation..14 Susceptibility testing..14 Frequency scanning..14 Modulation of susceptibility signals..14 Thresholds of susceptibility..15 Calibration of measuring equipment..15 Measurement system test..15 Antenna factors..15 iv MIL-STD-461G DRAFT DATED 2 MARCH 2015 CONTENTS PARAGRAPH PAGE 5.

9 DETAILED REQUIREMENTS ..23 General..23 Units of frequency domain measurements..23 EMI control requirements versus intended installations..23 Emission and susceptibility requirements, limits, and test procedures..23 CE101, conducted emissions, power leads..25 CE101 applicability..25 CE101 limits..25 CE101 test procedure..26 Purpose..26 Test equipment..26 Procedures..26 Data presentation..27 CE102, conducted emissions, power leads..33 CE102 limits..33 CE102 test procedure..33 Purpose.

10 33 Test equipment..33 Procedures..33 Data presentation..34 CE106, conducted emissions, antenna terminal..38 CE106 applicability..38 CE106 limits..38 CE106 test procedure..38 Purpose..38 Test equipment..39 Procedures..39 Transmit mode for transmitters and amplifiers..39 Receivers and stand-by mode for transmitters and amplifiers..40 Data presentation..41 Transmit mode for transmitters and amplifiers..41 Receivers and stand-by mode for transmitters and amplifiers..41 CS101, conducted susceptibility, power leads.