SRM 3000 Selective Radiation Meter

1 USA TEL: (1) 631 231-1700 FAX:(1) 631 231-1711 E-MAIL: TEL: 49-7121-9732-777 FAX: 49-7121-9732-790 E-MAIL: and Magnetic Field Measurement50 Years ofExcellenceRF SafetyTest Solutionsancommunications companynardaSafety Test SolutionsSRM 3000 Selective Radiation Meter Complete Solution for Selective Measurementof RF and Microwave Electromagnetic Fields Isotropic and Single-Axis Measurementsfrom 100 kHz to 3 GHz Excellent Immunity for Operation inHigh Field Strengths Automatic Antenna and Cable Detection Results in V/m, A/m, Power Density,or Percentage of Permissible Limit Automatic Correlation of Results withTelecommunication Services ( , TETRA,GSM, UMTS) Based on User-Defined Tables Automatic Computation of Contribution ofIndividual Services to Overall Field Exposure(Safety Evaluation mode) Resolution Bandwidths (RBWs) up to 5 MHzfor UMTS and W-CDMAF eaturesThe Selective Radiation Meter (SRM) is a hand-heldselective measuring device for safety analysis of RF andmicrowave electromagnetic fields.

2 The SRM can be usedby broadcasters, radio network operators, measurementservice providers and public authorities to selectivelymeasure the field exposure produced by individualtelecom services and assess the results in accordancewith the applicable standards. Most measurements re-quired in the mobile radio sector can be performed di-rectly using the hand-held device. The SRM immediatelyevaluates the results on SRM consists of a basic unit and a measurement an-tenna. The basic unit contains a spectrum analyzer for the100 kHz to 3 GHz frequency range. It can be operated us-ing antennas from Narda or in combination with measure-ment antennas from other manufacturers.

3 The triaxialantenna allows isotropic (non-directional) measurementsfrom 75 MHz to 3 GHz, covering FM radio up to theW-CDMA and UMTS basic unit and antenna are battery powered, rugged,and easily hand portable, offering all of the functionsneeded to evaluate, store, and document results withouta separate PC. However, when required, results can eas-ily be exported to a PC for long-term storage or SRM is a hand-held measuring device that was devel-oped for analyzing safety issues in electromagnetic includes specially designed modes for safety applica-tions. It can also be used as a conventional RF spectrumanalyzer for general field strength measurements. Typicalapplications are as follows:COMPARISON MEASUREMENT IN AKNOWN-FIELD ENVIRONMENT"Site sharing" is the usual situation today: Suppose thatseveral mobile radio service operators have antennas lo-cated on a common tower or a roof.

4 The overall electro-magnetic Radiation exposure from any number of sourcesneeds to remain below a specified limit that usually varieswith frequency. The SRM displays the total field exposureand also the contributions of the individual services (abso-lute value or percentage of permissible limit).This allows operators, public authorities and measure-ment service providers to verify directly, on-site, whetherthe different services comply with emission regulationsand if not, to know which operator needs to reduce its out-put power and by how and Magnetic Field Measurement50 Years ofExcellenceRF SafetyTest SolutionsUSA TEL: (1) 631 231-1700 FAX:(1) 631 231-1711 E-MAIL: TEL: 49-7121-9732-777 FAX: 49-7121-9732-790 E-MAIL: companynardaSafety Test SolutionsOVERVIEW MEASUREMENT IN ANUNKNOWN-FIELD ENVIRONMENTAll of the industrialized nations have stipulated emissionlimits for both working environments and for the generalpublic.

5 Special care is often taken in sensitive areas suchas schools and SRM allows public authorities and measurement ser-vice providers to verify whether operators are complyingwith the applicable limits. With the SRM it is easy to make afast scan of all the field sources in the frequency range ofinterest. The SRM is so sensitive that the very weaksources, such as individual mobile radio channels, can beseparately evaluated even inside buildings. An overviewmeasurement is also useful for detecting any OF INDIVIDUALTELECOM SERVICESO perators are responsible for the fields produced by theirown services. Even in a very complex field environment,and in the vicinity of powerful broadcast signals, the SRMcan be used to measure individual transmit channels orfrequencies.

6 The device is capable of integrating over itsfrequency range and displaying the total value (an abso-lute value). For example, for GSM measurements, theSRM can use a 200 kHz resolution bandwidth (RBW) tomeasure the field strength of an individual control channel(BCCH) which always transmits at full power and esti-mates the field emissions which all of the traffic channels(TCH) would produce under full load. For UMTS measure-ments, the SRM can use a 5 MHz resolution bandwidth tomeasure an entire frequency SRM is capable of taking long-term measurementsshowing how the field strength of a selected frequencyvaries over time. The peak values can be saved to providevaluable information for service providers and local au-thorities , the SRM can demodulate the pilot channels(P-CPICH) of individual cells of UMTS base stations andextrapolate the "worst case" electromagnetic exposurelevel from the resultOperationThe SRM's basic unit contains the spectrum analyzer withthe RF input unit, measurement/operations processor, in-put panel and display.

7 All of the functions and parameterscan be set directly using softkeys and/or a SRM can also compute results as follows: Field strength level or percentage ofpermissible exposure level Single source or single channel List of sources or channels Contribution from a given telecom service Contribution from all services and theirpercentage of the total field strengthThe SRM automatically recognizes the following data: Antenna factors for converting the antenna outputvoltage into field strength SRM automat-ically recognizes the individual correction factors froman EEPROM built into the antenna via a separate controlcable. If the antenna is connected to the basic unit via aNarda extension cable, the SRM will also recognize thefrequency-dependent loss factors for the cable from anEEPROM in the cable.

8 For antennas and cables fromother manufacturers, the user can input the relevant cor-rection factors using the supplied PC software andtransfer the data to the SRM via the serial interface. Tomake measurements, just select the antenna and cabletype in the configuration menu. Exposure limits from common safety guidelines limits are stored in the SRM andcan be easily selected via a simple menu. Other limitscan be transferred to the SRM as an update via the serialinterface. Assignment of telecom services to frequency tables are provided in the supplied PCsoftware. A service table ( , "GSM-900") is a list of in-dividual operators by name along with the upper andlower limits of the assigned frequency band.

9 These listsare transferred to the SRM via the serial USING NARDA'STRIAXIAL ANTENNASuch measurements automatically produce isotropic( , non-directional) results. These measurements canbe made in three different ways. Antenna connected directly to the basic it possible to perform measurements in the en-tire mobile radio band. The SRM is well suited for use onradio masts and towers where it is difficult to make con-ventional narrowband measurements. As a truehand-held device, the SRM is relatively easy to use inthese awkward environments. Antenna connected to basic unit via cable. This isuseful if you need to take measurements over a givenvolume to find the location with the highest fieldstrength.

10 It is also possible to hang the basic unit from abelt or harness and hand-carry the antenna. Antenna mounted on a tripod and connected to ba-sic unit via arrangement produces the mostreliable results since the field being measured is not in-fluenced by the presence of the basic unit or the TEL: (1) 631 231-1700 FAX:(1) 631 231-1711 E-MAIL: TEL: 49-7121-9732-777 FAX: 49-7121-9732-790 E-MAIL: and Magnetic Field Measurement50 Years ofExcellenceRF SafetyTest Solutionsancommunications companynardaSafety Test SolutionsMEASUREMENTS USING ANTENNASFROM OTHER MANUFACTURERSA ntennas built by other manufacturers may be used withthe SRM. Of course, single-axis antennas will produce di-rectional results.