Radio, television, cellular telephony, wireless… Electromagnetic fields are used wherever and whenever wireless communications operate. These fields affect the whole environment, including the people moving about in them. Complete coverage would be impossible otherwise. National and international bodies have set limits to prevent harmful effects. These usually allow higher field strengths for the workplace environment than for the public. This is because people who routinely work in electromagnetic fields are normally professionally trained and aware of the risks, so they know what to do or they have been given instructions to limit their exposure time, for example. The operators of transmitting equipment and the responsible authorities are legally accountable for proving safety. To do this, they can make use of the services offered by institutes or private measurement providers. There is only one way you can prove safety: Measure it!
NARDA Gives safety
Narda Safety Test Solutions is said to be the world leader in the development and production of measuring instruments for electric, magnetic, and electromagnetic fields. The competence is based on the know-how gained from many years of experience in the high frequency and microwave sectors – and from more than 95% of all the published patents for measuring these fields. The result is a range of high-quality measurement solutions tailored to each application, with the long-term security provided by our management system that covers all areas and meets the requirements of the ISO 9001 and ISO/IEC 17025 standards.
Measurements with NARDA SRM 3006
Wideband meters give blanket coverage of large frequency ranges, such as from broadcast radio to cellular telephone frequencies and beyond. Equipped with special probes, they deliver results that are automatically referred to the applicable permitted limit values. They are generally easy to use. Selective measuring devices such as spectrum analyzer break down the fields into their individual frequency components, allowing detailed analysis. They are more difficult to use, and result evaluation requires a higher level of specialist knowledge.
The Selective Radiation Meter SRM-3006 from Narda Safety Test Solutions combines the analysis features of a spectrum analyzer with the simplicity of a wideband measuring set. It was specially developed for assessing safety in electromagnetic fields. Unlike an “adapted” spectrum analyzer, it provides you with operating modes tailored to each application for measuring individual transmission channels, and separate services such as analog or digital radio (TV, DVB-T, DAB), cellular radio (GSM, UMTS, LTE), or wireless (WLAN, WiMAX). The results are shown in a table as separate values and as a total value. The display is in field strength, power density, or directly weighted as a percentage of the permitted limit value. You don’t need to be a spectrum analysis specialist to be able to use the SRM.
Broadcasting, cellular radio, industrial plant: Which source is contributing what to the field exposure level? Answering this question is as important to the relevant authorities and safety representatives as much as to the service providers. They often also need to know which installation, which channel or which radio cell is transmitting at what field strength. That is because whoever has exceeded the limit value will have to reduce their output power. In contrast, it is the overall exposure level that is important when it comes to protecting people and the environment.
The Selective Radiation Meter SRM is predestined for such investigations thanks to its application-oriented operating modes. For example: ‘Safety Evaluation’ with automatic evaluation of individual services such as analog TV, digital radio (DVB-T, DAB), cellular telephony (GSM, UMTS, LTE), and wireless (WLAN, WiMAX) as well as a summary of the results as a total value. Or: ‘Level Recorder’ mode, which allows even pulsed radar signals to be recorded numerically. Or: ‘Scope’, with its display of field characteristic versus time. The resolution bandwidths are also tailored to the application. The SRM can select one narrow GSM channel or record the entire width of a DVB-T channel with this feature.
India has adopted one of the most stringent Electro Magnetic Field(EMF) exposure norms in the world. The measures taken by the Department of Telecommunications, Government of India, are Mobile Tower EMF and mobile phones.
- EMF exposure limit (Base Station Emissions) is lowered to 1/10th of the existing ICNIRP exposure level effective from 1st 2012. India now has one of the most stringent EMF exposure norms in the world.
- Telecom Enforcement Resource & Monitoring (TERM) Cells of DOT have been entrusted with the job of conducting audit on the self-certification furnished by the Service TERM Cell shall carry out test audit up to 10% of the BTS site on random basis and on all cases where there is a public complaint.
- Telecom Engineering Centre (TEC) has revised the Test Procedure for measurement of EMF for verification of EMF compliance for BTS towers in accordance with new standards effective from 1st 2012.
Direction Finding, Radio Surveillance, Interference Localization, Occupational safety, Environmental Protection
- Wide frequency range from 9 kHz to 6 GHz
- Single and three axis (isotropic) antennas
- Resolution bandwidths (RBW) up to 32 MHz
NARDA SRM 3006 units are available with Livingston India Pvt Ltd.
For rental and second-hand purchase one can contact at [email protected]