Service Manuals, User Guides, Schematic Diagrams or docs for : Rohde & Schwarz FAM

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      MODULATION ANALYZERS                                                                                    analyzers




      Characteristics, uses                                             The Frequency-range Extension Option - which can be
                                                                        retrofitted - extends the frequency range up to 1360 MHz,
      The Modulation Analyzer FAM otters a maximumof con.
                                                                        thus covering practically all radio services.
      venience for modulation measurements on AM, FM and
      phase-modulated signals. All tunctions being microproc-
                                                                        Special features The FAM exhibits negligible inherent
      essor-controlled,manual operationis reducedto aminimum.
                                                                        noise and excellent linearity.
      Modulationmeasurementsover a range of carrier frequen-
      cies from 55 kHz to 1360 MHz are performedmore precisely          Residual FM being less than 1 Hz in the basic frequency
      end more easlly with the FAM than with previouslyavailable        range (proportionallyincreasingabove) with CCITT weight-
      equipment. The lEG-bus interface makes the instrument             ing and 5 Hz with 20 kHz weightingbandwidth,whilst residual
      system-compatibleend suitable tor use in automated test           AM is as low as 0.01%. the FAM perrnitsunwantedmodula-
      assembties.                                                       tion to be measuredprecisely.
      Types 01 measurements The ModulationAnalyzercan be                The FM stereo noise of FAM model 54, being -72 dB
      usedtor measurements    otherwisecalling tor up to five differ-   referredto 40 kHz deviation,CCIR weightlng,permitsprecise
      ent instruments.It features the following capabilities:           SI N-ratlorneasurements, say, on FM broadcasttransmitters.
      .   Measurementof modulation depth, frequency deviation           The transmission IInearity of the FAM fulfils the exacting
          and phase deviation                                           demands involved in wideband modulation methods used.
                                                                        tor example, in FM broadcasting. Excellent amplitude and
      .   Simultaneouscarrier-frequencymeasurementwith 1 Hz
          or 10 Hz resolution                                           phase linearity make distortion-freedemodulationof multi-
                                                                        plex signals possible;see applicationexample on page after
      . Measurementof modulationfrequencywith 0.1 Hz reso-              next.
          lution
                                                                        Dlstortlon of less than 0.1% and stereo channel separation
      .   Distortionmeasurementdown to <0.1 %,                          of 50 dB guarantee accurate results of measurement.
          also SINAD indication in dB
      . AF vo/tage measurement with               weighting filters
        (psophometerfunction)
      . Evaluationof external AF signals
      Unwantedmodulationcan be measuredand weightedaccu-
      ratelyon account of switch-selected test bandwidths and
                                                                         Democ*Jiat8d
      standardweighting filters.                                         stereoaignal
                                                                          av8l8*M
       Fjeld of appllcation The basic model covers a carrier-            FM~oI
      frequency range of 55 kHz to 120 MHz and offers a very               ModIMaon
                                                                        AnaIyzerFAM
      economical and high-performance solution tor measuring
      tasks in FM and AM broadcastingand certaln radiotelephony
254   and other radio services.
analyzers

Setting, measurement, display                                Modulation measurement, display The middle section is
                                                             used tor setting the type ot modulation and time constant,
The front panel ot the FAM is divided into thr" tunctional
                                                             seleding the filter and displayingthe modul8tlon measure-
sedions for easy operation and clear presentation ot the
                                                             ment result. An additional,analog display in the form 01 a
results, several parametersbeing displayedsimultaneously:
                                                             light spot moving around a clrcle greatly 1acilitatesadjust-
Lefthandsection       Carrier-frequency display              ments by providingtrend indication.The user simply selects
                      and entry (with manual tuning)         the type 01 modulation   - AM,   FM or 








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