scope:

Purpose.

This part of MIL-HDBK-240 supplements DESR 6055.09 by providing the guidance necessary to characterize the electromagnetic environment (EME) to mitigate hazards of electromagnetic radiation to ordnance (HERO).

Technological advances have resulted in the continued proliferation of communication and radar equipment, many of which radiate high levels of electromagnetic (EM) energy. Advances in weapon technology have increased the use of sensitive, low-power electronic circuits in the design of ordnance systems, presenting the possibility of unintended actuation of or damage to the circuits caused by this EM energy. This concern is addressed by conducting comprehensive radiation hazard assessments through mathematical modeling and analysis, on-site measurements and evaluations, or a combination of methods. These assessments characterize the level of radio frequency (RF) EMEs so that guidance can be provided to minimize safety and reliability hazards while maintaining mission operability in the RF environment. This process is termed HERO assessment.

The results from the various HERO assessments can be used to update MIL-HDBK-235 and ultimately the HERO Test EME found in MIL-STD-464. In addition, the data is contributing to North Atlantic Treaty Organization's (NATO's) efforts to capture their operational EME.

Background.

There are four specific objectives of this handbook:

a. Document the Joint-Service process to characterize the EME.

b. Promote standardization.

c. Identify alternative techniques and instrumentation.

d. Facilitate the exchange of data.

Ultimately, the information gathered is used to assist in developing the operational guidance (Part 7 of this document) for ordnance and weapon systems containing electrically initiated devices (EIDs).

When defining the operational EME, one should anticipate not only the individual Service EME, but also the EME in Joint-operation scenarios. JROCM 102-05 states that "Because all weapons/weapon systems have the potential of being deployed together or employed in joint environments, weapons and weapon systems will be considered joint systems within the Joint Capabilities Integration and Development System (JCIDS) process unless they are assigned the Joint Potential Designator of 'Independent.'" As Joint operations become more commonplace, there is an increased likelihood that weapons from one Service will be exposed to other Services' EME levels.

intended Use:

This handbook can be used by any facility engaged in the evaluation of the EME for any of the military departments.