37.558

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37.558 is a technical specification that is part of many worldwide standards and regulations for a variety of applications. It is used as a reference point for measuring the performance, reliability, and safety of products and services that contain technology certified to meet this standard.

The specific standard being referenced here is ISO/IEC 37.558, which is the International Electrotechnical Commission (IEC) standard for radio frequency (RF) safety. It indicates the parameters and requirements of a device to ensure that radiation that is emitted from it does not exceed safety levels. This performance is evaluated against a set of predetermined limits for power density or incident field strength.

The 18-page IEC 37.558 document covers the radiofrequency safety of products using electromagnetic fields within the frequency range 3 kHz - 300 GHz. These frequencies are divided into four bands, each having their own specific requirements. They are the ultra-high frequency (UHF, 300 MHz - 3 GHz), super-high frequency (SHF, 3 GHz - 30 GHz), extremely high frequency (EHF, 30 GHz - 300 GHz), and the control frequency (CF, 3 kHz - 300 MHz).

The application field of IEC 37.558 is broad and includes telecommunications, industrial, medical, and scientific areas. Examples of products tested against this standard include cell phones, satellite antennas, smart meters, Wi-Fi routers, radio and television broadcast towers and antenna arrays, and military equipment.

The main purpose of IEC 37.558 is to prevent health hazards that can be caused by electromagnetic fields. It therefore sets thresholds for the maximum allowable electromagnetic exposure (measured in units of power density or incident field strength) that a person can be subjected to. If the device under test exceeds these thresholds, it must be re-engineered or shielded to reduce the emissions until they are below the specified limits.

The working principle of IEC 37.558 is based on the sensitive interaction between the human body and electrical and magnetic fields. The electric (E) and magnetic (H) fields created by electrical devices cause charges to move through the body, and this in turn can influence biological systems (e.g. nerves, muscles). The effects range from minor discomfort to serious health risks, and these effects increase as the exposure to the fields increases.

IEC 37.558 sets limits on the power density (relative to a point in space) or incident field strength (relative to a surface) of a device. It also includes requirements for the distance of the device from the user and specifies procedures for testing. These limits and procedures are designed to ensure that exposure to the RF fields from a device will not exceed safety levels.

In summary, IEC 37.558 is an internationally-recognized standard that is used to ensure the safety of products that contain technology certified to meet it. The application field of the standard is broad and includes telecommunications, industrial, medical, and scientific areas. The working principle of IEC 37.558 is based on the sensitive interaction between the human body and electrical and magnetic fields. It sets limits on the power density or incident field strength of a device, and also includes requirements for the distance of the device from the user. These limits and procedures are designed to ensure that exposure to the RF fields from a device will not exceed safety levels.

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