The application

In today's industrial society the use of wireless devices which emit electromagnetic fields is becoming more and more frequent. National and international norms set limiting values which, for health reasons should not be exceeded.

The specific absorption rate SAR corresponds to the energy absorbed by the body in an electromagnetic field. This is used as a base quantity to evaluate this high frequency electromagnetic exposure and indicates the power absorbed into the tissue per unit of mass.

This leads to a warming of the tissue and in the case of the relevant values, to tissue damage. The most sensitive body parts besides the brain are the eyes. The unit is watt/kg of tissue. In the case of close field exposure as, for example when using mobile telephones, the SAR limiting values refer to the maximum average absorption that occurs in the human body and per 1g or 10g of tissue mass.

The ESM-120 enables a quick and sure determination of the SAR generated by mobile wireless equipment, antennae, stationary radio plants, base stations, etc. It is particularly suitable for research, development and training purposes.

The meter

The ESM-120 is a unique measuring head which enables you to determine the SAR. A new technology (protective rights registered in many countries) has made it possible for the first time, to determine the SAR in real-time. It consists of the actual measuring head with a HF sensor, the body with operating controls, LC display with illumination and an optical interface. The display indicates the current SAR as a decimal value and as a bargraph.

The measurement is carried out according to ANSI C95.1-199 average per 1g of tissue mass. While measuring a mobile phone a tone generator can be selected. This enables the results of the changing SAR to be made visible. As an alternative the SAR can be emitted as a tone that changes its frequency. The instrument is calibrated and equipped with the latest computer technology.
 

SAR-measurement in real-time Isotropic precision probe Frequency range 900 MHz and 1800 MHz Large measuring range 0,001W/kg to 20W/kg High long time stability and precision Operation independent of mains or computer Automatic measuring range selection Signal tone dependent on field intensity Tone generator for mobile phone testing Very simple and intuitive operation Special features to facilitate work Clear and well laid out display 80 hours of continuous operation

The software

The Windows^tm compatible software delivered with the meter allows you to observe the SAR and the power control behavior between the base station and the mobile phone on the scope. It also is used to make the measured values accessible to a larger public, to store them and export them in standard formats.

With the fibre optic cable delivered along with the meter, the ESM-120 can be operated free of interferences and independent of the mains. It is also possible for it to be integrated in automatic test benches
 

Scope function of SAR values Automatic lettering of diagrams Bargraph display of measured values Insertion of limiting values in the graphic Remote control of ESM-120 Export of graphics and tables Integrated help function with F1 key Help text for every control
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