EUROLAB provides services to measure the attenuation properties of electromagnetic shielding enclosures with MIL-STD-285 tests. MIL-STD 285 covers a method for measuring the attenuation properties of electromagnetic shielding enclosures. These enclosures are used for electronic testing purposes in the frequency range of 100 kilo cycles to 10.000 mega cycles.
It is important to understand the terminology to understand the requirements of protection effectiveness testing. One of the main components of shielding effectiveness is attenuation. Attenuation is a rate expressed in decibels (db). The ratio is the ratio of the forces received on opposite sides of a shield when the shield is illuminated by electromagnetic radiation. According to MIL-STD-285, this is the value required to indicate the shielding effectiveness of electromagnetic enclosures.
An attenuator can be a 50 or 72 ohm transmission line, low input impedance, step attenuator. A signal generator must be used to calibrate the attenuator. The attenuator must be able to measure an insertion loss of over 70 db. When an attenuator is used between the receiver or transmitter and its antenna, which is used as the basis for the measurements to be calibrated, the antenna will "look back" to an impedance independent of the attenuator setting.
electromagnetic barrieris the topologically closed surface created to prevent or limit fields and transmitted transitions from entering the enclosed space. It consists of electromagnetic barrier, shield and POE processes. This barrier surrounds the protected volume and, if necessary, special protective volumes.
Electromagnetic shutdownis a treatment for preventing excessive electromagnetic field leakage at an opening entry point. Examples of techniques for sealing a seam between two metal plates are welding, brazing or soldering, and metal-to-metal contact under applied pressure with a mechanical attachment.
mission critical equipmentis defined as all the equipment needed to directly support a critical mission, the success or failure of which could affect the outcome of the war. Mission-critical equipment generally refers to all communications-electronics and support equipment that must be protected to perform critical trans and HEMP attack missions.
Point of entry (POE)is a location on the electromagnetic barrier where the shield is pierced and energy can enter the protected volume. This happens unless an adequate POE protection device is provided. POEs are classified as aperture POEs or penetrating conductors based on the type of penetration. They are also generally classified as architectural, mechanical, structural or electrical POEs according to the engineering discipline in which they are encountered.
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