Attachment 10 - ATPD-2407

ATPD 2407

JUNE 25, 2012

ELECTROMAGNETIC ENVIRONMENTAL EFFECTS

(E3) FOR US ARMY TANK AND AUTOMOTIVE

VEHICLE SYSTEMS TAILORED FROM MIL-STD-464C

NOT MEASUREMENT

SENSITIVE

UNCLASSIFIED: Distribution Statement A. Approved for public release.

Attachment 10

UNCLASSIFIED

ii

UNCLASSIFIED

FOREWORD

1. This ATPD has been prepared by the TACOM LCMC Electromagnetic Environmental Effects Requirements Board (E3RB) and is for use in the acquisition of tracked and wheeled tank and automotive vehicle systems.

2. Disclaimer: Reference herein to any specific commercial company, product, process, or service by trade name, trademark, manufacturer, or otherwise, does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or the Department of the Army (DoA). The opinions of the authors expressed herein do not necessarily state or reflect those of the United States Government or the DoA, and shall not be used for advertising or product endorsement purposes.

3. Comments, suggestions, or questions on this document should be addressed to U.S. Army Tank automotive and Armaments Command, ATTN: RDTA-EN/STND/TRANS, MS# 268, 6501 E. 11 Mile Road, Warren, MI 48397 5000 or emailed to usarmy.detroit.rdecom.mbx.tardec-standardization@mail.mil. Since contact information can change, you may want to verify the currency of this address information using the ASSIST Online database at http://assist.daps.dla.mil.

Attachment 10 25 June 2012 iii

1 SCOPE

1.1 Scope

1.2 Application

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 Electromagnetic Environment (EME)

3.2 Platform

3.3 Instrumented Electrically Initiated Device (EID)

4 GENERAL REQUIREMENTS

4.1 General

4.2 Verification

4.3 System operation during E3 testing

4.4 Protection of personnel from electromagnetic fields

5 DETAILED REQUIREMENTS

5.1 Margins

5.1.1 Requirement

5.1.2 Verification

5.2 Intra-system electromagnetic compatibility (EMC)

5.2.1 Requirement

5.2.2 Verification

5.2.3 Hull generated intermodulation interference (IMI)

5.2.4 Shipboard internal electromagnetic environment (EME)

5.2.5 Multipaction

5.2.6 Induced levels at antenna ports of antenna-connected receivers

5.2.6.1 Requirement

5.2.6.2 Verification

5.3 External RF EME

5.3.1 Requirement

5.3.2 Verification

5.4 High-power microwave (HPM) sources

5.4.1 Requirement

5.4.2 Verification

5.5 Lightning

5.5.1 Requirement

5.5.2 Direct Strike Verification

5.5.3 Near Strike Verification

5.6 Electromagnetic pulse (EMP)

5.6.1 Requirement

5.6.2 Verification

5.7 Subsystems and equipment electromagnetic interference (EMI)

5.7.1 Requirement

5.7.2 Verification

iv

UNCLASSIFIED

5.7.3 Non-developmental items (NDI) and commercial items

5.7.3.1 Requirement

5.7.3.2 Verification

5.7.4 Shipboard DC magnetic field environment

5.8 Electrostatic charge control

5.8.1 Requirement

5.8.2 Verification

5.8.3 Vertical lift electrostatic discharge (ESD)

5.8.3.1 Requirement

5.8.3.2 Verification

5.8.4 Precipitation static (p-static)

5.8.5 Electrostatic discharge, ordnance and EID-based subsystems

5.8.5.1 Requirement

5.8.5.2 Verification

5.8.6 Electrostatic discharge, electrical, electronic, and electromechanical subsystems

5.8.6.1 Requirement

5.8.6.2 Verification

5.9 Electromagnetic Radiation Hazards (EMRADHAZ)

5.9.1 Requirement

5.9.2 Verification

5.9.3 Hazards of electromagnetic radiation to personnel (HERP)

5.9.3.1 Requirement

5.9.3.2 Verification

5.9.4 Hazards of electromagnetic radiation to fuel (HERF)

5.9.4.1 Requirement

5.9.4.2 Verification

5.9.5 Hazards of electromagnetic radiation to ordnance (HERO)

5.9.5.1 Requirement

5.9.5.2 Verification

5.10 Life Cycle, E3 hardness

5.10.1 Requirement

5.10.2 Verification

5.11 Electrical Bonding

5.11.1 Requirement

5.11.2 Verification

5.11.3 Electrical bonding, current return paths

5.11.3.1 Requirement

5.11.3.2 Verification

5.11.4 Electrical bonding, antenna installations

5.11.4.1 Requirement

5.11.4.2 Verification

5.11.5 Electrical bonding, mechanical interfaces

5.11.5.1 Requirement

5.11.5.2 Verification

5.11.6 Electrical bonding for shock, fault, and ignitable vapor protection

5.11.6.1 Requirement

5.11.6.2 Verification

5.11.7 Electrical bonding for protection of ordnance from ESD v

5.11.7.1 Requirement

5.11.7.2 Verification

5.12 External Grounds

5.12.1 Requirement

5.12.2 Verification

5.12.3 Aircraft grounding jacks

5.12.4 Servicing and maintenance equipment grounds

5.13 TEMPEST

5.13.1 Requirement

5.13.2 Verification

5.14 System radiated emissions

5.14.1 Requirement

5.14.2 Verification

5.14.3 Emission control

5.14.4 Inter-system EMC

5.14.4.1 Requirement

5.14.4.2 Verification

5.15 EM Spectrum Supportability

5.15.1 Requirement

5.15.2 Verification

6 NOTES

6.1 Intended use

6.2 Acquisition requirements

6.3 MIL-STD-464C Data Item Descriptions (DIDs)

6.4 Tailoring guidance for contractual application

6.5 Technical points of contact

6.5.1 Certified TEMPEST Technical Authority (CTTA)

6.6 Subject term (key word) listing

6.7 Acronyms

TABLE I. Minimum received signal TABLE II Maximum external EME for tank and automotive systems TABLE III HERO EME test frequencies TABLE IV Number of required discrete emitter frequencies for external RF EME TABLE V Non-pulse waveform modulation type TABLE VI Wideband HPM for tank and automotive systems TABLE VII Comparison of EME levels for EIDs TABLE VIII Acronyms

1 SCOPE

1.1 Scope.

This Army-Tank Purchase Description (ATPD) tailors MIL-STD-464C, Environmental Effects (E3) Requirements It establishes requirements and verification criteria for tanks and automotive systems based on the applicable ground system requirements of MIL-STD-464C.

The requirements and verification criteria of this document apply to ordnance only as integrated to Army tank and automotive platforms; not individual items of ordnance.

1.2 Application.

This ATPD is applicable for complete Army tank and automotive systems, both new and modified.

2 APPLICABLE DOCUMENTS

2.1 General.

The documents listed in this section are referenced in sections 3, 4, and 5 of the main body of this document. This section does not include documents referenced in other sections of this document or recommended for additional information or examples. While every effort has been made to ensure completeness of this list, document users are cautioned that applicable systems must meet all specified requirements of documents cited in sections 3, 4, and 5 of this document, whether or not they are listed.

2.2 Government documents.

2.2.1 Specifications, standards and handbooks.

The following specifications, standards and handbooks form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract (see 6.2).

INTERNATIONAL STANDARDIZATION AGREEMENTS

NATO AECTP-500 - Electromagnetic Environmental Effects Test and Verification

(Copies of this document are available from http://nsa.nato.int/nsa/ or NATO Standardization Agency, North Atlantic Treaty Organization HQ, 1110 Brussels, Belgium, or as directed by the contracting officer.)

DEPARTMENT OF DEFENSE STANDARDS

MIL-STD-188-141 - Interoperability and Performance Standards for

Medium and High Frequency Radio Systems MIL-STD-188-181 - Interoperability Standard for Access to 5-kHz and 25-kHz UHF Satellite Communications Channels MIL-STD-188-182 - Interoperability Standard for UHF SATCOM DAMA

Orderwire Messages and Protocols MIL-STD-188-183 - Interoperability Standard for Multiple-Access 5-kHz and 25-kHz UHF Satellite Communications Channels MIL-STD-331 - Fuze and Fuze Components, Environmental and

Performance Tests for MIL-STD-461 - Requirements for the Control of Electromagnetic

Interference Characteristics of Subsystems and Equipment

MIL-STD-464 - Electromagnetic Environmental Effects (E3) Requirements for Systems

MIL-STD-1472 - Human Engineering MIL-STD-2169 - High-Altitude Electromagnetic Pulse (HEMP)

Environment

DEPARTMENT OF DEFENSE HANDBOOKS

MIL-HDBK-235-1 - Military Operational Electromagnetic Environment Profiles, Part 1, General Guidance

MIL-HDBK-235-4 - External Electromagnetic Levels for Ground Systems MIL-HDBK-235-8 - External Electromagnetic Levels for High Power

Microwave Systems MIL-HDBK-240 - Hazards of Electromagnetic Radiation to Ordnance

(HERO) Test Guide

(Copies of these documents are available from https://assist.dla.mil/quicksearch/ or from the Standardization Document Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia, PA 19111-5094. MIL-STD-2169 is classified and requests for this document shall be referred to the Defense Threat Reduction Agency, 8725 John J. Kingman Road, Stop 6201, Ft. Belvoir, VA 22060. See MIL-HDBK-235-1 for instructions on requesting copies of MIL-HDBK-235-4 and

MIL-HDBK-235-8.)

2.2.2 Other Government documents, drawings, and publications.

The following other Government documents, drawings, and publications form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract (see 6.2).

DEPARTMENT OF DEFENSE

DoDD 3222.3 - DoD Electromagnetic Environmental Effects (E3) Program

DoDI 6055.11 - Protecting Personnel from Electromagnetic Fields DoD 4145.26-M -

Explosives

(Copies of these documents are available from http://www.dtic.mil/whs/directives/index.html.)

NSTISSAM

CNSS TEMPEST 01-02 - Advisory Memorandum, NONSTOP

Evaluation Standard NSTISSAM TEMPEST/1-92 - Compromising Emanations Laboratory Test

Requirements, Electromagnetics NSTISSAM TEMPEST/2-95A - RED/BLACK Installation Guide

(Copies of CNSS and NSTISSAM documents are classified and available only through the procuring activity.)

2.3 Non-Government publications.

The following publications form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those sited in the solicitation or contract (see 6.2).

AMERICAN NATIONAL STANDARDS INSTITUTE (ANSI)

ANSI C63.14 - American National Standard Dictionary of Electromagnetic Compatibility (EMC) including Electromagnetic Environmental Effects (E3)

(Copies of these documents are available from www.ansi.org or ANSI Customer Service Department, 25 W. 43rd Street, 4th Floor, New York, NY 10036.)

EUROPEAN UNION COMMISSION DIRECTIVE

2004/104/EC - Official Journal of the European Union Commission Directive

(Copies of these documents are available from http://eur-lex.europa.eu/)

SAE INTERNATIONAL

SAE-J1645 - Society of Automotive Engineers (SAE) Fuel Systems and

Components-Electrostatic Charge Mitigation

(Copies of these documents are available from www.sae.org or SAE Customer Service, 400 Commonwealth Drive, Warrendale, PA 15096-0001.)

2.4 Order of precedence.

In the event of a conflict between the text of this document and the references cited herein, the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been established.

3 DEFINITIONS.

The terms used in this ATPD are defined in MIL-STD-464C and ANSI Standard C63.14. In addition, the following definitions are applicable for the purpose of this ATPD.

3.1 Electromagnetic Environment (EME).

The resulting product of the power and time distribution, in various frequency ranges, of the radiated or conducted electromagnetic emission levels that may be encountered by a military force, system, or platform when performing its assigned mission in its intended operational environment. 3222.3)

For the purpose of clarification, the EME includes emitters of electromagnetic radiation both external to the system as well as integral to the system.

3.2 Platform.

For the purposes of this ATPD, a platform is a tracked or wheeled vehicle, and is considered a system.

3.3 Instrumented Electrically Initiated Device (EID).

The laser and ordnance firing mechanisms, fire extinguishers, training pyrotechnics, and airbag igniters instrumented to include instrumented dummy/inert EID ordnance placed in the breech and in the ammunition storage.

4 GENERAL REQUIREMENTS

4.1 General.

General requirements shall be in accordance with MIL-STD-464C.

4.2 Verification.

This ATPD, in conjunction with the guidance presented in MIL-STD-464C Appendix A, provides the information necessary to successfully verify compliance of Army tank and automotive systems with the tailored requirements of MIL-STD-464C as described in this document.

4.3 System operation during E3 testing.

Validation of system operation during E3 testing requires a disciplined, consistent, and repeatable approach to ensure system performance requirements are met. Identify the step-by-step procedures necessary to operate and exercise the system during testing and post-test

These procedures shall be consistent with the applicable performance specification(s), operational doctrine, etc. and be repeatable during E3 testing. Procedures may need to consider different modes of system operation.

These procedures shall address system aspects as applicable. This includes safety critical functions, mission essential functions, ordnance firing mechanisms, communication busses and all life cycle aspects of the platform, including (as applicable) production, normal in-service operation, communications at maximum output power, checkout, upgrades/modernization, training, maintenance and repairs, obsolescence and technology insertions, storage, transportation, handling, packaging, loading, unloading, launch, and the normal operating procedures associated with each aspect.

System functions exercised as part of the step-by-step procedures shall be monitored to determine system response(s) to test stimulus. This monitoring may include real-time observation of system instruments by personnel or automated data acquisition systems.

Where applicable, dwell or exposure times to test stimulus shall be equal to or greater than the slowest cycle time of the system and installed subsystems. This is necessary to ensure the exposure time to a test stimulus is sufficient to elicit a response based on known system time constants or latencies. Dwell times may need to be reduced to limit personnel exposure to RF energy (Section 4.4).

All procedures developed to exercise the system shall be validated for suitability and fitness of purpose prior to their use during E3 testing.

4.4 Protection of personnel from electromagnetic fields.

Limit electromagnetic radiation exposure of personnel during testing to meet the requirements of hazards of electromagnetic radiation to personnel (HERP) for personnel safety in accordance with DoD Instruction 6055.11. This is applicable to all tests contained in this document where radio frequency (RF) is generated external to or by subsystems as installed on the platform.

5 DETAILED REQUIREMENTS

This section specifies the E3 requirements for tanks and automotive systems. Each system requirement includes verification methods that determine the effectiveness of the EMC design and support the E3 system tests that are typically performed by a DoD test facility. An overall assessment shall be performed, such as systems engineering analysis, of the applicability and sequence of each requirement and verification.

5.1 Margins.

5.1.1 Requirement.

The requirements for margins shall be in accordance with MIL-STD-464C.

5.1.2 Verification.

Compliance shall be verified through test and analysis.

Margins can be applied to the stimulus field and can sometimes be applied to the system response. Often the stimulus test device cannot produce the required field strengths with margin and the system response must be extrapolated to simulate the required levels. The margin measurements shall be performed without extrapolation whenever possible. Instrumentation installed in system components during testing for margins shall capture the maximum system response and shall not adversely affect the normal response characteristics of the component.

When environment simulations below specified levels are used, instrumentation responses may be extrapolated to the full environment for components with linear responses (such as hot bridgewire EIDs). When the response is below instrumentation sensitivity, the instrumentation sensitivity shall be used as the basis for extrapolation. For components with non-linear responses (such as semiconductor bridge EIDs), no extrapolation is permitted.

5.2 Intra-system electromagnetic compatibility (EMC).

5.2.1 Requirement.

The requirements for intra-system electromagnetic compatibility shall be in accordance with

MIL-STD-464C.

5.2.2 Verification.

Compliance shall be verified through analysis, inspection, and test.

The intra-system test should be performed in an electromagnetically quiet environment.

Prior to intra-system EMC testing:

a) Verify the test vehicle/system and all subsystems are functional and parameters to be monitored during the test are within their nominal operating ranges by using the procedures developed in accordance with Section 4.3.

b) Verify the bonds and grounds tests (see Section 5.11.2) have been successfully completed on the test vehicle.

c) Inspect all antennas to verify proper installation.

d) Verify the output power and receiver sensitivity of the radios installed in the test platforms comply with their specified requirements. Emitters shall transmit at typical power levels.

Analysis shall determine the source and victim subsystems.

Compliance shall verify that:

a) Each victim operates as specified with worst case emissions from each separate source.

b) All victims operate as specified with worst case emissions from all sources combined.

5.2.3 Hull generated intermodulation interference (IMI).

This requirement of MIL-STD-464C is not applicable.

5.2.4 Shipboard internal electromagnetic environment (EME).

This requirement of MIL-STD-464C is not applicable.

5.2.5 Multipaction.

5.2.6 Induced levels at antenna ports of antenna-connected receivers.

5.2.6.1 Requirement.

The requirements for induced levels at antenna ports of antenna-connected receivers shall be in accordance with MIL-STD-464C.

For each antenna/receiver system mounted to the vehicle, and with the Minimum Received Signal (MRS) set to the value of TABLE I, the voice quality shall not degrade below a modified rhyme test (MRT) score of 91% in accordance with MIL-STD-1472. The data throughput shall not degrade to a level below the acceptable level of TABLE I.

TABLE I. Minimum received signal.

Communication Standard or Frequency

Range (MHz)

Minimum Received

Signal (dBm)

Error Rate

Throughput (Kbps)

MIL-STD-188-

2.0-29.9999

-1111) N/A N/A

30-87.975 -86 5.0E-2 (Data)

0.6-2.4 4.8 6.0

MIL-STD-188-

181, 182, and

Satellite1) 1.0E-3 2.4

1575.42 (L1)

1227.60 (L2)

-131.51) -134.51)

FOM<3 N/A

420-450 -92 1.0E-1 (Data)

1) These specifications are taken from the associated standard or Interface Control Document. Verification/validation of performance of these devices as installed on the system will require the use of the actual radio set.

5.2.6.2 Verification.

Compliance shall be verified through analysis and test.

Analysis shall identify the antenna connected receivers, antennas and the antenna placement for the system. The criterion of TABLE I shall be determined for any platform mounted communication systems that are not identified in TABLE I.

The vehicle under test shall be operated with all subsystems on and in modes found by analysis to be of greatest potential to degrade antenna connected receiver performance. More than one mode may be required. These modes of operation shall be consistent with the procedures developed in accordance with Section 4.3.

Verify the test vehicle/system and all subsystems are functional and parameters to be monitored during the test are within their nominal operating ranges by using the procedures developed in accordance with Section 4.3.

Analysis shall determine the worst-case frequencies and hop sets. Electromagnetic spectrum plots will be generated to determine electromagnetic noise levels at all vehicle mounted antennas.

The intra-system pre-test requirements of Section 5.2.2 shall be applicable. The test shall be performed in two phases. Data from the first phase shall be analyzed and used to determine the frequencies that pose the greatest risk of receiver degradation for testing in the second phase.

Select the frequency bands that indicate the highest level of interference from the internal EME.

1) Phase 1 Spectrum Measurements This test shall include the entire frequency band of each antenna-connected receiver for all potential sources of unintentional RF emissions, including potential spurious emissions from out-of-band transmitters. The induced levels at each antenna port for antenna-connected receivers shall be evaluated as follows:

a) The ambient emissions levels at the antenna port of the receiver under test shall be measured. Measurements shall be performed with a spectrum analyzer (or an equivalent type of frequency selective equipment) at the antenna port of the receiver.

b) The emission levels at the antenna port of the receiver under test shall be measured while the system is operated in each applicable mode using the procedures developed in accordance with Section 4.3. Transmitters outside the frequency band of interest for the antenna port under test shall be actively radiating signals, the engine shall be running and the electrical subsystems shall be operating while the measurements are performed.

c) Compare the measured emissions levels to the ambient noise level at the receivers to determine the frequency bands where it may be susceptible to potential degradation.

2) Phase 2 This test shall be performed to determine the impact of unintentional RF emissions on communications as follows:

a) A radio link shall be established between a fixed transmitter external to the system and the receiver installed on the system. The transmitting signal shall be attenuated to measure the worst case Minimum Received Signal of TABLE I at the receiving antenna.

b) Evaluate the performance of each communication system using the criteria specified in Section 5.2.6.1 over the frequency bands determined in Phase 1. The performance shall comply with the system s operational voice, throughput or data rate requirements.

c) The modified rhyme test (MRT) as specified in MIL-STD-1472 shall be used to measure the speech intelligibility of voice communication systems. A data traffic generator modulation source and a Bit Error Rate (BER) analyzer should be used to measure the BER of the data communication systems.

5.3 External RF EME.

5.3.1 Requirement.

The system shall be electromagnetically compatible with its defined external RF EME such that its system operational performance requirements are met.

EME requirements for tank and automotive systems shall comply with TABLE II. A minimum of 3 dB margin shall be added to the maximum EME values in TABLE II. Margins for EIDs, safety critical and mission critical functions shall be in accordance with MIL-STD-464C.

TABLE II Maximum external EME for tank and automotive systems.

Frequency Range (MHz)

Electric Field (V/m RMS)

Peak Average

0.01 2 50 50 2 30 103 103

30 150 57 57 150 225 50 50 225 400 58 58 400 700 98 98 700 790 50 50 790 1000 284 50

1000 2000 2452 134 2000 2700 489 50 2700 3600 1148 191 3600 4000 489 50 4000 5400 645 129 5400 5900 6146 155 5900 6000 549 55 6000 7900 549 55 7900 8000 549 97 8000 8400 1095 110 8400 8500 1095 110 8500 11000 1943 139

11000 14000 3454 103 14000 18000 7897 243 18000 50000 2793 73

The EME shall be emitted at discrete frequencies in steps. A minimum of 350 discrete frequencies between 10 kHz and 50 GHz is recommended for each vehicle orientation. This should include a mix of average power (275 frequencies) and peak power (75 frequencies), the exact mixture of which is platform dependent. These test frequencies shall encompass the representative HERO test frequencies of MIL-HDBK-240 as shown in TABLE III of this document, and the number of test steps within the associated frequency bands defined in TABLE IV of this document.

TABLE III HERO EME test frequencies.

Frequency (MHz)

2.00 8.00 32 57 100 400 1000 3672 9300

2.30 9.19 34 60 115 438 1155 4243 10098

2.64 10.56 36 63 132 480 1335 4902 11668

3.03 12.13 38 67 152 527 1543 5665 13482

3.48 13.93 40 71 174 577 1783 5950 15578

4.00 16.00 43 75 200 632 2060 6545 18000

4.59 18.38 45 80 230 693 2380 7563 26500

5.28 21.11 48 84 264 760 2750 7950 33000

6.06 24.25 50 89 303 833 2950 8200 39000

6.96 27.86 53 94 348 912 3178 8500

TABLE IV Number of required discrete emitter frequencies for external RF EME.

Frequency Band(s) (MHz) Minimum Number of Steps

Required within the Frequency Band(s)

2 30 30 30 60, 60 -88 10 (within each band) 225 290, 290 320, 320 - 400 4 (within each band) 406 420, 450 549 4 (within each band) 420 450 5 755 985 10

1307.5 +/- 0.5 1 (include specified frequency)

3249.9 +/- 0.5 1 (include specified frequency) 4400 5000 8

5637.5 +/- 0.5 1 (include specified frequency) 5650 +/- 0.5 1 (include specified frequency) 7900 8400 3 9100 +/- 0.5 1 (include specified frequency) 13080 +/- 0.5 1 (include specified frequency) 14900 +/- 0.5 1 (include specified frequency) 16600 +/- 0.5 1 (include specified frequency)

The remaining frequencies shall be chosen based on known electromagnetic vulnerabilities (EMV) of the vehicle. Smaller, roughly proportional steps shall be used at lower frequencies between 0.01MHz and 1GHz (approximately 75% of the steps should be below 1GHz). Larger, roughly proportional steps shall be used at higher frequencies greater than 1GHz. Pulse modulation parameters specified in MIL-HDBK-235-4 (classified) should be utilized as needed.

Modulation types defined in TABLE V shall be used for non-pulse modulations when specific emitter characteristics are not available.

Analysis shall identify frequencies that have the potential to damage the front-end circuitry of platform-installed receivers and cause receiver burnout. The receivers shall be protected from damage at these frequencies during EME testing.

TABLE V Non-pulse waveform modulation type.

Frequency (MHz) Modulation Type

0.01 1.99 CW, AM

2 19.9 CW, AM

20 149.9 CW, AM, FM

150 249.9 AM, FM

250 499.9 AM, FM

500 999.9 AM, FM

1000 1999.9 AM, FM

2000 3999.9 AM, FM

4000 7999.9 AM, FM

8000 9999.9 AM, FM

10000 50000 CW, FM

NOTES: CW = Continuous Wave FM = Frequency Modulation. Below 1 GHz use a 20 kHz deviation, modulated by 1 kHz tone. Above 1 GHz use 1 MHz deviation, modulated by a 10 kHz square wave

AM = Amplitude Modulation. Modulated by a 1 kHz, 50% modulation

The EME simulator should radiate sequentially in both vertical and horizontal polarization.

Vertically polarized illuminations should be performed below 30MHz and both horizontal and vertical polarizations should be performed above 30MHz.

Continuous sweep EME illumination and more aggressive margins should be used for supplemental testing critical and safety critical subsystems. MIL-STD-461 susceptibility tests of a critical subsystem hot mockup, like fire control, should be considered to determine additional potential vulnerability frequencies. Note that system-level tests tests may be less rigorous (e.g.:

exposed to fewer discrete test frequencies) as compared to MIL-STD-461 susceptibility tests performed on the subsystems.

An assessment shall be developed to determine which system functions may be allowed to exhibit degraded performance, but return to normal operation after the external EME is removed.

If there are operational performance issues with the absolute need for a subsystem to be totally functional in a particular environment, measures (such as external filters) shall be implemented in the system design and the definition of the appropriate methods to verify the subsystem performance shall be provided.

An EMV assessment shall be performed to determine the impact of the observed susceptibility (during test) on system operational performance (post test analysis).

5.3.2 Verification.

Compliance shall be verified through test and analysis.

Prior to External RF EME testing:

procedures developed in accordance with Section 4.3.

b) Verify the bonds and grounds tests (see Section 5.11.2) have been successfully completed on the test vehicle.

c) Verify the intra-system EMC verification (see Section 5.2.2) has been successfully completed on the test vehicle.

d) Identify the procedure(s) as developed in accordance with Section 4.3 to be performed by the vehicle crew which exercise and monitor the functions that may be susceptible to degradation caused by external RF EME.

During External RF EME testing, the system shall be powered and operational. The system shall be tested with vehicle hatches, doors and windows open. Operate and monitor the system using the procedures developed in accordance with Section 4.3.

The external EME tests should be performed in an open area test site. Where feasible, the main 3dB beamwidth of the antenna used to expose the platform to the EME shall be wider than the maximum dimension of the system. Use both vertical and horizontal polarization for frequencies above 30 MHz; only vertical polarization is necessary below 30 MHz.

System orientations that exhibit the worst-case coupling of EME into the system and subsystems based on analysis shall be tested. Consideration shall be given to HERF and HERO requirements when determining the system orientations to be tested; spot illumination of specific areas should be considered.

The EME as defined in paragraph 5.3.1 (peak and average) shall be used as stimulus for the test.

The laser and ordnance firing mechanisms, fire extinguishers, training pyrotechnics, and airbag igniters shall be instrumented, and instrumented dummy EID ordnance shall be placed in the breech and in the ammunition storage. The instrumented EID circuit shall be monitored during all EME test frequencies and demonstrated that any RF-induced energy in an EID circuit will not exceed a level expressed as a margin in dB below the maximum no-fire threshold sensitivity for the EID concerned. Refer to MIL-HDBK-240 for guidance on instrumentation of EIDs. A 16.5 dB MNFS margin shall be used for safety concerns and a 6dB MNFS margin for reliability concerns.

5.4 High-power microwave (HPM) sources.

5.4.1 Requirement.

The system shall meet its operational performance requirements after being subjected to the wideband HPM environments. Safety critical and mission critical functions, including mobility, shall not be degraded while being subjected to the HPM environment. The system shall meet its operational performance requirements after being subjected to the wideband HPM environments.

TABLE VI, the HPM environment derived using guidance from MIL-STD-464C Appendix A, shall be used to demonstrate compliance with the HPM requirements for tank and automotive systems.

TABLE VI Wideband HPM for tank and automotive systems.

Frequency Range

(MHz)

Broad-Band Electric Field Distribution

(mV/m/MHz@100m)

150 225 234000 225 400 234000

5.4.2 Verification.

Compliance shall be verified through test and analysis. The safety critical, mission critical and mobility functions shall be monitored while the system is being illuminated to verify that these systems do not degrade during illumination.

Prior to HPM testing:

procedures developed in accordance with Section 4.3.

b) Verify the bonds and grounds tests (see Section 5.11.2) have been successfully completed on the test vehicle.

c) Verify that the intra-system EMC verification (see Section 5.2.2) has been successfully completed on the test vehicle.

d) Identify the procedure(s) as developed in accordance with Section 4.3 to be performed by the vehicle crew which exercise and monitor the functions that may be susceptible to HPM degradation. The functional modes more susceptible to HPM or while operational shall be identified so the system can be placed in these modes during the test. At a minimum, the engine shall be running, and all subsystems shall be powered. These procedures shall be used to verify a good system and detect any system degradation after the HPM transient.

e) Evaluate the need (with suggested probe placement) for making internal field measurements (crew compartment, ordnance storage, power lines, cables etc.) during the test. A procedure to monitor the system functions required to operate during test illumination shall be defined. Ordnance firing mechanisms, ammunition compartments, training pyrotechnics, safety and mission critical functions shall be a priority in this analysis.

During HPM testing, use the exact threat waveforms or as close as technically feasible to the exact waveforms that are defined for each threat in MIL-HDBK-235-8 (Classified) for red force HPM. A wideband waveform such as double exponentials that cover the Broad-Band Electric Field Distribution can also be used.

The tests shall be performed in an open area test site. The HPM environment shall illuminate the system for a duration determined by analysis to expose any system vulnerabilities. The critical incidence(s) of illumination shall be determined through a coupling analysis of the system.

The system shall be operating and the vehicle hatches and windows shall be open when illuminated by the HPM environment. Operate and monitor the system using the procedures developed in accordance with Section 4.3. Additional testing may be performed with the vehicle in various operating modes and conditions (hatches closed, windows closed etc.). System degradations, latch-up and permanent degradation shall be considered potential failures that shall be evaluated and reported to the procuring activity for a pass/fail disposition.

Some subsystems may require test personnel in the vehicle operating the subsystems, such as the stabilization and fire control, and to verify that the safety critical, mission critical and mobility functions are not degraded during the test illumination. Refer to Section 4.4 of this document for additional details on the protection of test personnel. The operational verification procedure shall be performed before and after each test.

The laser and ordnance firing mechanisms, fire extinguisher, training pyrotechnics, airbag igniters and other EIDs shall be instrumented. Instrumented dummy EID ordnance shall be placed in the breech, launcher and all ordnance storage locations. The instrumented circuits shall be monitored during the transient field test and demonstrated that any RF-induced energy in the circuit will not exceed a level expressed as a margin in dB below the maximum no-fire threshold sensitivity for the EID or cause other safety/reliability concerns. Refer to MIL-HDBK-240 for guidance on instrumentation of EIDs. A 16.5 dB MNFS margin shall be used for subsystems with safety concerns and a 6dB MNFS margin shall be used for reliability concerns.

5.5 Lightning.

5.5.1 Requirement.

The system shall remain safe during the direct effects of lightning. Ordnance that is integrated to the system shall meet its operational performance requirements after experiencing a direct strike in a stored condition. Ordnance that is integrated to the system shall remain safe during and after experiencing a direct strike in an exposed condition. Stored ordnance is defined as being within the systems ammunition storage compartment with all access doors closed; otherwise the ordnance is considered exposed.

The system shall meet its operational performance requirements after the indirect effects of lightning and remain safe during the indirect effects of lightning. Ordnance that is integrated to the system shall meet its operational performance requirements after experiencing a near strike in an exposed condition. The distance for the near strike lightning shall be ten (10) meters.

5.5.2 Direct Strike Verification.

Compliance shall be verified through test and analysis.

A direct strike lightning test environment as defined in accordance with MIL-STD-464 shall be performed on the vehicle and subsequently be visually inspected for induced damage.

Instrumentation shall monitor the safety critical functions during the direct strike. The test instrumentation shall be evaluated and the operational verification procedures developed in accordance with Section 4.3 shall be performed before and after each lightning discharge.

Prior to Direct Strike Lightning testing:

procedures developed in accordance with Section 4.3.

b) Verify the bonds and grounds tests (see Section 5.11.2) have been successfully completed on the test vehicle.

c) Verify the intra-system EMC verification (see Section 5.2.2) has been successfully completed on the test vehicle.

d) Identify the procedure(s) as developed in accordance with Section 4.3 to be performed which exercise and monitor the functions that may be susceptible to degradation after the Direct Strike Lightning transient. These procedures shall be used to verify a good system and detect any system degradation after the Direct Strike Lightning transient.

Analysis shall determine the most probable strike points on the system. The strike points shall include those which would be most susceptible to damage or most likely to cause safety problems or operational reliability problems. Safety and vulnerability analysis shall determine the number/types/locations of dummy ordnance EID to employ for direct strike tests. Ordnance firing mechanisms, ammunition compartments, turret movement and safety critical functions shall be considered in the analysis.

Ordnance, devices with EIDs, laser firing mechanisms, fire extinguisher, training pyrotechnics and airbag igniters shall be instrumented. Instrumented dummy ordnance shall be placed in the breech, launcher and in ordnance storage locations as determined by the analysis. The instrumented circuit shall be monitored during the transient field test and demonstrated that RF-induced energy in the circuit, induced by the lightning simulator, will not exceed a level expressed as a margin in dB below the maximum no-fire threshold sensitivity for the EID or other safety concerns. Refer to MIL-HDBK-240 for guidance on instrumentation of EIDs. A 16.5 dB margin shall be used for safety concerns and a 6dB margin for reliability concerns.

5.5.3 Near Strike Verification.

Compliance shall be verified through test and analysis.

An indirect strike lightning test environment as defined in accordance with MIL-STD-464C shall be performed on the vehicle and subsequently be visually inspected for induced damage.

Prior to Near Strike Lightning testing:

procedures developed in accordance with Section 4.3.

b) Verify the bonds and grounds tests (see Section 5.11.2) have been successfully completed on the test vehicle.

c) Verify the intra-system EMC verification (see Section 5.2.2) has been successfully completed on the test vehicle.

d) Identify the procedure(s) as developed in accordance with Section 4.3 to be performed which exercise and monitor the functions that may be susceptible to degradation after the Near Strike Lightning transient. At a minimum, the engine shall be running and all subsystems shall be powered. These procedures shall be used to verify a good system and detect any system degradation after the Near Strike Lightning transient.

Analysis of the coupling effects shall predict susceptible circuits, identify susceptible apertures and predict where high energy may penetrate the system. The critical system test orientation and added test methods (such as using seam leakage sniffers prior to system test) will be determined based on the coupling analysis.

Safety and vulnerability analysis shall determine the number/types/locations of dummy ordnance EID to employ for direct strike tests. Ordnance firing mechanisms, ammunition compartments, turret movement and safety critical functions shall be considered in the analysis. The system shall be placed in the operating mode defined by the coupling analysis and operated using the procedures developed in accordance with Section 4.3.

Current injection tests (with suggested probe placement) on power lines and cables shall be performed if system vulnerabilities are suspected. The functional modes more susceptible to E3 shall be identified so the system can be placed in these modes during the test. A procedure to monitor the system functions that are required to operate during test illumination shall be defined. Ordnance firing mechanisms, ammunition compartments, training pyrotechnics, turret movement, air bag igniters, safety and mission critical functions shall be a priority in this analysis.

Vehicle hatches, doors, and windows shall be open when illuminated by the test transient.

Additional testing can be performed with the vehicle in various operating modes and conditions (hatches closed, windows closed, etc.).

The tests shall be performed in an open area test site. A bounded wave simulator that provides a uniform field over the entire system will be utilized. The test orientations shall include head, lateral and other critical incidence as determined by the coupling analysis. The transient shall illuminate the system not less than three (3) times for each orientation.

Some subsystems may require test crew in the vehicle operating the subsystems, such as the stabilization and fire control subsystems, during the test illumination. Refer to Section 4.4 of this document for additional details on the protection of test personnel.

The operational verification procedure shall be performed before and after each test. System degradations, latch-up and permanent degradation shall be considered potential failures that shall be evaluated and reported to the procuring activity for a pass/fail disposition.

The laser and ordnance firing mechanisms, fire extinguisher, training pyrotechnics, airbag igniters and other EIDs shall be instrumented. Instrumented dummy EID ordnance shall be placed in the breech, launcher and all ordnance storage locations. The instrumented circuits shall be monitored during the transient field test to demonstrate that any RF-induced energy in the circuit will not exceed a level expressed as a margin in dB below the maximum no-fire threshold sensitivity for the EID or cause other safety/reliability concerns. Refer to MIL-HDBK-240 for guidance on instrumentation of EIDs. A 16.5 dB MNFS margin shall be used for subsystems with safety concerns and a 6dB MNFS margin shall be used for reliability concerns.

5.6 Electromagnetic pulse (EMP).

5.6.1 Requirement.

The requirements for EMP shall be in accordance with MIL-STD-464C. After exposure to the EMP environment and after recycling the vehicle master power all functions shall be operational with no degradation.

5.6.2 Verification.

The system shall be tested with vehicle hatches and windows open. The EMP tests shall be performed in an open area test site. The EMP transient shall be defined by MIL-STD-2169 (classified). The EMP shall illuminate the entire vehicle. The verification methods of paragraph

5.5.3 shall be used for the EMP verification.

5.7 Subsystems and equipment electromagnetic interference (EMI).

5.7.1 Requirement.

Individual electronic, electrical, and electromechanical subsystems and equipment shall conform to requirements as specified for Army ground platforms by MIL-STD-461.

5.7.2 Verification.

Compliance shall be verified through subsystem and equipment testing in accordance with MIL- STD-461. Test results shall be reviewed to verify compliance to the MIL-STD-461 requirements. Test results which show a passing result, but fall within the uncertainty of the applied measurement system, shall be identified. The system function(s) supported by the identified subsystem(s) and equipment shall be considered when developing the test plan for system-level E3 tests.

5.7.3 Non-developmental items (NDI) and commercial items.

5.7.3.1 Requirement.

NDI and commercial items shall meet the requirements as specified for ground systems by

MIL-STD-461.

5.7.3.2 Verification.

Compliance shall be verified as in Section 5.7.2.

5.7.4 Shipboard DC magnetic field environment.

This requirement of MIL-STD-464C is not applicable.

5.8 Electrostatic charge control.

5.8.1 Requirement.

The system shall safely control and dissipate the build-up of electrostatic charges caused by fluid flow, air flow, exhaust gas flow, personnel charging, track static and other charge generating mechanisms to avoid fuel ignition, inadvertent detonation or dudding of ordnance hazards, to protect personnel from shock hazards, and to prevent performance degradation or damage to electronics.

The resistance from the system ground to all surfaces of the fuel system components shall be less than 100 kilohms (105 ohms). The resistance from the system ground to the track pads shall be less than 100 kilohms (105 ohms).

5.8.2 Verification.

Compliance shall be verified through test and inspection. Verify that the bonds and grounds inspection has been completed successfully on the test vehicle prior to system level ESD tests.

Inspect the fuel carrying system to verify compliance with Society of Automotive Engineers

Inspect the track pads (if applicable) to verify compliance with the system design requirements.

Measure the resistance from the system ground to the track pads.

5.8.3 Vertical lift electrostatic discharge (ESD).

5.8.3.1 Requirement.

The system shall meet its operational performance requirements after being subjected to a ±300 kilovolt discharge. This requirement is applicable to systems which may be transported through external lift by aircraft.

5.8.3.2 Verification.

Compliance shall be verified through test, analysis, inspections, or a combination thereof.

Prior to Vertical Lift ESD testing:

procedures developed in accordance with Section 4.3.

b) Verify the bonds and grounds tests (see Section 5.11.2) have been successfully completed on the test vehicle.

c) Verify the intra-system EMC verification (see Section 5.2.2) has been successfully completed on the test vehicle.

d) Identify the procedure(s) as developed in accordance with Section 4.3 to be performed which exercise and monitor the functions that may be susceptible to degradation after the Vertical Lift ESD transient. These procedures shall be used to verify a good system and detect any system degradation.

Analysis shall determine the most probable locations on the system where ESD may occur during the vertical lift process.

Apply the test discharges to the locations as determined by analysis to simulate the vertical lift scenario. Testing of the system shall require a minimum of three (3) discharges per test point directly to the system depending upon the configuration used in transport. Apply both positive and negative polarity discharges using a simulated aircraft capacitance of 1000 picofarads through a maximum of one (1) ohm resistance with a circuit inductance not to exceed 20 microhenries. The system should have discharges applied to several locations around the system. After each discharge, verify proper operation of the system using the procedures developed in accordance with Section 4.3.

5.8.4 Precipitation static (p-static).

5.8.5 Electrostatic discharge, ordnance and EID-based subsystems.

5.8.5.1 Requirement.

Subsystems that interface with ordnance or EID-based subsystems shall not inadvertently initiate, dud, or disable the ordnance or EID when subjected to a ±25 kilovolt electrostatic discharge (ESD).

5.8.5.2 Verification.

Prior to ESD testing of ordnance and EID-based subsystems:

procedures developed in accordance with Section 4.3.

b) Verify the bonds and grounds tests (see Section 5.11.2) have been successfully completed on the test vehicle.

c) Verify the intra-system EMC verification (see Section 5.2.2) has been successfully completed on the test vehicle.

d) Identify the procedure(s) as developed in accordance with Section 4.3 to be performed which exercise and monitor the functions that may be susceptible to degradation after the ESD transient. These procedures shall be used to verify a good system and detect any system degradation.

Analysis shall predict the ordnance locations within the system that may susceptible to ESD and the ordnance types to be instrumented throughout the system.

The ordnance firing mechanisms, fire extinguisher, training pyrotechnics and airbag igniters shall be instrumented and instrumented dummy ammunition ordnance shall be placed in the breech and in the ammunition storage.

Compliance shall be verified by test (such as MIL-STD-331 or AECTP 500, Category 508 Leaflet 2). Apply both positive and negative polarity discharges, using a network consisting of a 500 picofarad capacitor discharging through a 500 ohm resistor with a circuit inductance not to exceed 5 , to the ordnance subsystem (such as electrical interfaces, enclosures, and handling points), airbags, and fire extinguisher subsystems including, but not limited to the predicted worst case points.

The effects from a personnel static charge applied to any electrical interface, enclosure, and handling point of the ordnance, airbags, training pyrotechnics (such as the Hoffman Device), Main Gun Signature Simulators and fire extinguisher subsystems shall evaluated.

The instrumented EID circuit shall be monitored during the ESD event and demonstrated that any induced energy in an EID circuit will not exceed a level expressed as a margin in dB below the maximum no-fire threshold sensitivity for the EID concerned. A 16.5 dB MNFS margin shall be used for safety concerns and a 6dB MNFS margin for reliability concerns.

5.8.6 Electrostatic discharge, electrical, electronic, and electromechanical subsystems.

5.8.6.1 Requirement.

Electrical, electronic, and electromechanical subsystems that do not interface with or control ordnance items shall not be damaged by a maximum ±8 kV contact discharge or ±15 kV air discharge during normal installation, handling, operation, and maintenance.

5.8.6.2 Verification.

Prior to ESD testing:

a) Verify the subsystem to be tested is functional and the parameters to be monitored during the test are within their nominal operating ranges by using the procedures developed in accordance with Section 4.3.

b) Verify the bonds and grounds tests (see Section 5.11.2) have been successfully completed on the test vehicle.

c) Verify the…