SRM-3006: SELECTIVE RADIATION METER SRM: WHEN SAFETY COUNTS Safety Test Solutions"

SAFETY? Radio, TV, mobile phones, wireless services: Electromagnetic fields are the medium wherever such forms of communication are used. These fields affect everything around them including the people that are ­ oving m within them. Complete coverage would otherwise be i ­mpossible. National and international authorities have fixed limit values for such fields to prevent harmful effects. The field strengths allowed in the occupational environment are usually higher than those for the general public, because people who routinely work in electromagnetic fields are trained, aware of the potential...

Legislators have laid the responsibility for ensuring ­ afety s upon the operators of transmitting equipment and the relevant authorities. These, in turn, can take advantage of the measurement services offered by organizations and independent providers. There is really only one way to make sure everything is safe: Photo reproduced by kind permission of ORS – Österreichische Rundfunksender GmbH & Co KG Austrian Broadcasting Services, www.ors.at

CHECK? HOW? Wideband measuring equipment gives blanket ­­ coverage of large frequency ranges, which could range from the broadcast band to the mobile phone band and b ­ eyond, for example. When fitted with special probes, such equipment can deliver results that are expressed automatically in terms of the applicable permitted limit v ­ alues. These devices are usually easy to operate. Selective devices such as spectrum analyzers break the fields down into their individual frequency components, allowing detailed analysis. They are more complex to operate and some specialist knowledge is needed...

The Selective Radiation Meter and its m ­ easuring antennas are matched. Any antenna and any instrument in the range can be combined to form a handy unit. Plug and Play. The results can be shown in physical units, e.g. electric field strength in V/m, magnetic field strength in A/m, and power density in W/cm2, or directly as a percentage of the limit values, for example those s ­ pecified by ICNIRP. Important: The SRM can also subsequently convert results to percentages, physical units or logarithmic quantities.

DEPENDABLE? ment doesn’t miss a thing. And you can set up and save measurement routines in advance, ensuring reproduc­ ible results and eliminating incorrect settings. Legally airtight, trustworthy results depend on many factors: The measuring equipment must be calibrated. The measurement must comply with standards, and it must be made professionally and correctly. The SRM can create measurement reports on-site, so there’s no possibility of transmission errors creeping in. The instrument includes the underlying standard in the result, records the date, time and GPS coordinates, and also saves...

Impossible to falsify: Screenshot of a 'Safety Evaluation' result

SRM – WHAT FOR? Electromagnetic fields always consist of an electrical and a magnetic field component. Limit values are therefore specified for both the electric as well as the magnetic field strength. The electric and magnetic field strengths at a distance from the source are in a fixed relationship, so it is sufficient to measure just one of the two components. This relationship does not apply close to the source, so both components must be determined separately. The wavelength of the radiation determines the ­ocation l of the near-field and the far-field. The near-field of a long wave transmitter...

ISOTROP – SINGLE AXIS Quick and reliable because they are non-directional: The isotropic antennas detect the field strengths in three mutually perpendicular directions, and the SRM automatically calculates the resulting field strength. Nevertheless, isotropic measurements are also possible using the single-axis antennas if you use a tripod and the ­ ntenna holder, which allows you to make suca cessive measurements in three mutually perpendicular p ­ ositions. The SRM supports this procedure by saving the result for each of the three positions and then calculating the resulting field strength...

Broadcasting, mobile telephony, industrial equipment: What proportion of the overall field is from which source? The answer is of interest to the relevant authori- ties and safety representatives as well as to the opera- tors themselves. There is often a need to know what field strength is emanating from which equipment, which channel or which radio cell. This determines who must reduce output power in the event that the limit values are exceeded, for example. On the other hand, the overall field strength is more important when it comes to human safety and environmental protection. SPECTRUM ANALYSIS...

SAFETY EVALUATION UMTS Which channels are occupied? The bar graph display in 'Safety Evaluation' mode shows maximum, average, and minimum values simultaneously, so you can clearly see what's going on. View pulsed signals directly in 'Scope' mode: The time domain display can be set to cover a period of 24 hours or can be more finely resolved, even down to Batten ^^^B°P£ i-HArtt a*K17M.WSrvT QWM)T| This, is a coital senwe mespgei UMTS P-CPICH Demodulation: The SRM automatically identifies every received UMTS cell by means of its scrambling code and measures the field strength or power density of...

KEEP CHECKING It doesn’t take long to measure the actual field exposure level. But how does the level change over a period of seconds, minutes, hours, or even days? Particularly convenient: The SRM determines the instantaneous, average, maximum, and minimum values at the same time. The SRM-3006 records individual radio channels in real time with microsecond resolution in ‘Scope’ mode; this capability is needed in order to capture radar impulses. On the other hand, the instrument can also be used for long-term measurements, such as a ‘Safety Evaluation’. The flow of data doesn’t have to become...