MODUK DEF STAN 59-411: PART 3 PDF

This part of the Defence Standard defines the preferred techniques to be used for the measurement of the electromagnetic compatibility characteristics to limit the propagation and coupling of unintentional electromagnetic energy whether conducted or radiated. It covers the following types of equipment procured by the Ministry of Defence for all three Services. Man Worn, Man Portable Equipment, Line Replacement Unit (LRU) and Sub-Systems and Support Equipment Requirements. It also covers any specialised EMC Test Equipment Requirements.

The procedures and limits outlined within this part of the Defence Standard are generally more stringent than those evoked by the European Directive 89/336/EEC (Note from 20 July 07 this will be EMC Directive 2004/108/EC). These reflect the harsher environment in which military equipment will operate. It is not permissible or acceptable to compare or cross reference test results from Euro Norms or Commercial Specifications with the procedures and limits contained within.

Man Worn / Man Portable Equipment

Annex A describes the preferred techniques to be used for the measurement of the electromagnetic compatibility characteristics of Man Worn and Man Portable electrical and electronic equipment.

Line Replacement Units and Sub Systems

Annex B describes the tests that are applicable to Line Replacement Units (LRUs) and Sub-Systems to limit the propagation of unintentional electromagnetic energy whether conducted or radiated internally or externally to a weapon platform, military vehicle, ship or aircraft. To limit any susceptibility to the internal or external operational electromagnetic environments of the weapon platform, in which the equipment will be fitted.

Support Equipment

See Part 1 of this Standard.

Performance Specification for Specialised EMC Test Equipment

Annex C specifies mandatory specifications for certain specialised items of test equipment as follows:

Performance requirements for transient and pulse generators.

Performance requirements for injection probes needed to couple generator output into equipment under test.

Performance requirements for calibration jigs needed to verify generator performance.

Information for the requirements of special voltage probes and their calibration.

Impedance/frequency compliance requirements for the Line Impedance Stabilising Network (LISN) called up in the tests described in this part of the Defence Standard. Some non-mandatory constructional information and a LISN calibration procedure are provided.

Methods of damping a screened room, the damping performance of the screened room and the verification procedures for measuring the screened room's performance.

Design of a twin-T filter to be used with the voltage probe when performing DCE03 and DCS01 measurements.

This Part of the Defence Standard also includes:

Some simulated NEMP, lightning strike and electrostatic discharge tests.

Information for individual tests is included under the clause ‘Detailed Test Requirements and Rationale'. This includes rationale for requirements, guidance in applying the requirements, and lessons learned from platform and laboratory experience. This information should help users understand the intent behind the requirements. In addition it should aid the procuring activity in tailoring emission and susceptibility requirements as necessary for particular applications and help users develop detailed test procedures in the Test Plan based on the general test procedures in this Part of the Defence Standard. This background information is provided for guidance purposes and as such, should not be interpreted as providing contractual requirements.