Defence Standard Part 3. Issue 1 Publication Date 23 January Electromagnetic Compatibility. Part 3. Test Methods and Limits for Equipment. DEF STAN PART 3: Electromagnetic Compatibility Part: Test Methods and Limits for Equipment and Sub Systems. DEF STAN PART Electromagnetic Compatibility Part: Platform and System Tests and Trials.

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Def Stan 59-411 Pdf

Ministry of Defence, Def Stan Issue 1 on. Electromagnetic Compatibility ( EMC) was published in January. and supersedes Def Stan and. We work with you to create MIL-STD and DEF STAN testing programs that meet your technical, contractual and operational requirements, giving you. Defence Standard Part 2 Issue 1 - Download as PDF File .pdf), Text Def Stan Part 3: Test Methods and Limits for Equipment and Sub-Systems .

UK Defence Standard on Electromagnetic The document is organised into five Parts shown in Figure 1, which also shows the relationship to the previous Def Stan Guidance is provided to assist Project Managers and Contractors select appropriate EMC activities, dependent on project size and complexity. The expected outcome is that MoD procurement contracts will require compliance with applicable EU directives, unless a specific exemption is granted, due to essential national security interests. Applying EU directives to defence projects can lead to duplication of test programmes and additional costs. However, testing can be minimised by establishing Technical Documentation to demonstrate that Def Stan satisfies the majority of the EMC directive requirements and that the remaining unsatisfied requirements are addressed by testing in accordance with commercial standards. Def Stan is not a safety standard, but recognises that controlling EMC plays an important role in safety management; therefore, the Part 1 includes guidance on EMC and functional safety and Part 4 provides trials for platform safety clearance.

Applying the EMC Directives to defense projects could lead to the duplication of compliance-testing—once for Def Stan and once for CE Marking—and could incur additional costs as well. However, testing can be minimised by establishing within the Technical Documentation the equivalence between Def Stan and commercial standards using the gap analysis process described above.

Note that the process can be used in either direction; to show equivalence of commercial standards to Def Stan or to show equivalence of Def Stan to commercial standards. Note, however, that the generally held perception that Def Stan satisfies the majority of the EMC Directive requirements is not always true.

Defence & Military

Unsatisfied requirements need to be addressed by testing in accordance with commercial standards. What assistance is available in this process? However, given the complexity of performing gap analysis, a Notified Body provides a low risk solution. He can be reached at Peter.

DEF STAN 59-411: PART 04

Dorey tuv-sud. If any difficulty arises which prevents application of the Defence Standard, UK Defence Standardization DStan shall be informed so that a remedy may be sought.

To the extent permitted by law, the MOD hereby excludes all liability whatsoever and howsoever arising including, but without limitation, liability resulting from negligence for any loss or damage however caused when the standard is used for any other purpose. This Part of the Standard describes how to identify and quantify the environments so that their EM impact on a system can be assessed.

It may then be used to determine the parameters of any incident field upon any boundary drawn around a victim platform or its systems.

Equipment designers can then assess the effects of this field on internal systems by considering the EM coupling mechanisms across the chosen boundary. The aim of this Part of the Standard is to provide a comprehensive description of the principal intentional and unintentional EM threats, within the scope described in Clause 1, to which military systems will be subjected.

DEF-STD and the challenge of Land Class A

This will assist the process of defining a specific EM environment for a system based on the operational scenario. Typical Air, Sea and Land design environments for a number of different military scenarios are included, which may be appropriate to certain generic equipment.

Also, some guidance on possible routes to demonstrate compliance with Military EMC requirements is provided. The means of defining the climatic and mechanical environments that are experienced by military materiel is described in Defence Standard This part of the Defence Standard is to be read in conjunction with the following parts in the Def Stan series.

The environments considered include those with sources arising from natural phenomena as well as those generated by man-made activities, both civil and military.

DEF STAN 59-411: PART 3

Where immunity to such threats is a requirement, specialist advice on such environments should be sought from the relevant authorities. These provide the design guidance, along with competent engineering practices, for a cost-effective and robust military product design. The starting point for EMC is self-compatibility, where the final product or system does not interfere with its own operation.

As we shall see, this is the modest starting point for military EMC, which extends to both lower and higher frequencies than most commercial EMC standards and to both lower emission limits and much higher susceptibility requirements. Test methods generally differ from their commercial counterparts in both setup and detail. History of Military EMC EMC problems in commercial applications were first noted worldwide in the s, when early broadcast radios were being installed in automobiles.

Reception was degraded by ignition noise and electrostatic buildup caused by non-conductive rubber tires. It required shielding of the vehicle ignition system, regulator and generator.

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