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GUI Reference

R&S

®

CMW-KM645

21

User Manual 1173.9740.02 ─ 04

Frequency

Center frequency of the RF analyzer. Set this frequency to the RF carrier frequency to
obtain a meaningful measurement result.

Remote command: 

CONFigure:FMSTereo:MEAS<i>:RFSettings:FREQuency

Expected Nominal Power

Sets the analyzer in accordance with the nominal power of the RF signal to be mea-
sured. The nominal power is the average output power at the DUT during the measure-
ment intervals where the RF transmitter is on. The "Ref. Level" is calculated as the
expected peak power at the output of the DUT:

Reference level = Expected Nominal Power + User Margin

Note: 

The actual input power at the connectors (i.e. the "Reference Level" minus the

"External Attenuation (Input)" value, if all power settings are configured correctly) must
be within the level range of the selected RF input connector; refer to the data sheet.

Remote command: 

CONFigure:FMSTereo:MEAS<i>:RFSettings:ENPower

User Margin

Margin that the R&S

 

CMW adds to the "Expected Nominal Power" in order to deter-

mine its reference power ("Ref. Level"). The "User Margin" is typically used to account
for the known variations of the RF input signal power, e.g. the variations due to a spe-
cific channel configuration.

FM signals are transmitted at constant power (constant-envelope signals), so the
default "User Margin" of 0 dB should be sufficient.

Remote command: 

CONFigure:FMSTereo:MEAS<i>:RFSettings:UMARgin

Mixer Level Offset

Varies the input level of the mixer in the analyzer path. A negative offset reduces the
mixer input level, a positive offset increases it. Optimize the mixer input level according
to the properties of the measured signal.

Mixer Level
Offset

Advantages

Possible Shortcomings

< 0 dB

Suppression of distortion (e.g. of the inter-
modulation products generated in the
mixer)

Lower dynamic range (due to smaller sig-
nal-to-noise ratio)

> 0 dB

High signal-to-noise ratio, higher dynamic
range

Risk of intermodulation, smaller overdrive
reserve

Remote command: 

CONFigure:FMSTereo:MEAS<i>:RFSettings:MLOFfset

Parameters and Settings

深圳德标仪器 

135-1095-0799

Содержание CMW-KM645

Страница 1: ...R S CMW KM645 FM Stereo Radio Firmware Applications User Manual User Manual 1173 9740 02 04 X2 Test Measurement 135 1095 0799...

Страница 2: ...one 49 89 41 29 0 Fax 49 89 41 29 12 164 E mail info rohde schwarz com Internet www rohde schwarz com Subject to change Data without tolerance limits is not binding R S is a registered trademark of Ro...

Страница 3: ...9 3 4 Limit Settings and Conformance Requirements 10 3 4 1 RF Carrier Requirements 11 3 4 2 RF Modulation Requirements 11 3 5 Measurement Results 11 3 5 1 RF Carrier Results 11 3 5 2 RF Modulation Re...

Страница 4: ...ions and General Information 32 6 1 1 MEAS i 32 6 1 2 FETCh READ and CALCulate Commands 32 6 1 3 Current and Statistical Results 33 6 1 4 Values for RF Path Selection 33 6 1 5 Keywords 34 6 1 6 Reliab...

Страница 5: ...apters can be read independently of each other However they are all organized as follows 1 General Description 2 Application Sheets optional 3 GUI Reference 4 Programming Examples 5 Command Reference...

Страница 6: ...st of comprehensive command sequences You can check just a single com mand of a sequence to get an example for the syntax of this single command But you can also consider an entire sequence showing th...

Страница 7: ...d later of the FM Stereo Radio Measure ment firmware application Compared to version 3 2 10 there are only editorial changes Software Version To check your R S CMW software version open the Setup dial...

Страница 8: ...stortion ratio SINAD and Signal to Noise Ratio SNR measurement For background information on FM signals and conformance requirements refer to the relevant standards e g IEC 60315 4 1997 Methods of mea...

Страница 9: ...sults The following measurements require additional settings The demodulated left and right AF channel signals can be measured with different filter settings in the AF analyzer path Deemphasis Filter...

Страница 10: ...t detect well The A weighted scale commonly is used in local ordinances and standards A lowpass filter and a highpass filter with selectable cutoff frequencies You can use the highpass filter to elimi...

Страница 11: ...wing limits apply The maximum Pilot Deviation is 8 to 10 of the maximum frequency deviation of 75 kHz The RDS subcarrier deviation is from 1 0 kHz to 7 5 kHz The recommended best compromise is 2 0 kHz...

Страница 12: ...tly after the FM demodulator before sep aration of the different baseband signal contributions see figure 3 7 Multiplex Deviation Peak Maximum frequency deviation due to the baseband signal relative t...

Страница 13: ...value See also figure 3 4 Audio Right Deviation Peak 2 Frequency deviation due to the right audio channel half of the peak to peak value Pilot Frequency Error Frequency error of the pilot signal rela...

Страница 14: ...ation results the left and right channel signals are filtered as described in chapter 3 3 AF Filter Settings on page 9 Fig 3 7 FM stereo decoder with measuring points Stereo signals are used for the t...

Страница 15: ...ion Results Fig 3 9 FM Stereo Radio AF Results The SNR Statistics table contains the following results Weighted RMS Frequency deviation due to the left right audio channel mea sured in the weighting f...

Страница 16: ...production of harmonic frequencies by an electronic system when a signal is applied at the input is known as harmonic distortion The following fig ure shows the fundamental wave labeled M1 and the 2nd...

Страница 17: ...D SINAD dB 20 log 100 THD N SNR dB 10 log S N 10 log V1 2 N The R S CMW displays THD values up to 100 A results close to 100 may indicate incorrect settings e g a specified reference frequency which i...

Страница 18: ...statistical tables and Average or Max traces are calculated according to the general rules for statistical results See also Statistical Results in the R S CMW user manual chapter System Over view Stat...

Страница 19: ...tate Additional measurement substates can be retrieved via remote control Remote command INITiate FMSTereo MEAS i MEValuation STOP FMSTereo MEAS i MEValuation ABORt FMSTereo MEAS i MEValuation FETCh F...

Страница 20: ...r and the RX module to be used Depending on your hardware configuration there may be dependencies between both parameters Select the RF connector first The Converter parameter offers only val ues comp...

Страница 21: ...s ENPower User Margin Margin that the R S CMW adds to the Expected Nominal Power in order to deter mine its reference power Ref Level The User Margin is typically used to account for the known variati...

Страница 22: ...configure the scope of the measurement See also Statistical Settings in the R S CMW user manual chapter System Over view Fig 4 2 FM Stereo Radio Configuration Measurement Control Repetition Defines ho...

Страница 23: ...ies whether measurement results that the R S CMW identifies as faulty or inac curate are rejected A faulty result occurs e g when an overload is detected In remote control the cause of the error is in...

Страница 24: ...cy AF Bandpass Variable Selects the center frequency and bandwidth of the variable bandpass filter in the AF analyzer see chapter 3 3 AF Filter Settings on page 9 The variable bandpass affects the Ban...

Страница 25: ...Modulation Upper limits for the measurement results which characterize the FM modulation of the measured RF signal For a detailed description of the results refer to chapter 3 5 2 RF Modulation Resul...

Страница 26: ...Each dialog shows the most important RF and analyzer settings The dialogs also visualize the limit check results See also Limit Check in the R S CMW user manual chapter System Overview The following...

Страница 27: ...nual 1173 9740 02 04 AF Results To retrieve the AF results use the following commands Remote command FETCh FMSTereo MEAS i MEValuation AFLeft CURRent etc FETCh FMSTereo MEAS i MEValuation AFRight CURR...

Страница 28: ...ith the following syn tax FMSTereo MEAS MEValuation Use general commands of the type FMSTereo MEAS no MEValuation mnemonic to define the signal routing and perform RF and ana lyzer settings After a RS...

Страница 29: ...MEAS MEValuation SCOunt AF 30 CONFigure FMSTereo MEAS MEValuation RESult RFSCalars ON CONFigure FMSTereo MEAS MEValuation RESult AFSCalars ON 5 4 Specifying Limits Define limits and enable limit chec...

Страница 30: ...CONFigure FMSTereo MEAS MEValuation AF FILTer HPASs H300 CONFigure FMSTereo MEAS MEValuation AF FILTer WEIGhting AWEight CONFigure FMSTereo MEAS MEValuation AF THDFrequency 800 1200 CONFigure FMSTere...

Страница 31: ...173 9740 02 04 Abort measurement and query substates again should be OFF INV INV FETCh FMSTereo MEAS MEValuation STATe ALL ABORt FMSTereo MEAS MEValuation FETCh FMSTereo MEAS MEValuation STATe ALL Con...

Страница 32: ...ting several instances of the same firmware application It can be omitted if the instrument supports only one instance or to address the first instance See also Firmware Applications in the R S CMW us...

Страница 33: ...section lists all values available for path selection Depending on your configura tion only a subset is relevant for you Virtual connector names are only relevant for setting commands Queries return...

Страница 34: ...as the result of a query Firmware Software Indicates the lowest software version supporting the command Command enhancements in later software versions are also indicated 6 1 6 Reliability Indicator...

Страница 35: ...re active 17 RF Level not Settled 18 RF Frequency not Settled The measurement could not be started because the R S CMW was not yet ready to deliver stable results after a change of the input signal po...

Страница 36: ...ent If the error occurs again consider the following hints Firmware errors can often be repaired by restoring the factory default settings To restore these settings restart your instrument and press t...

Страница 37: ...i SCENario SALone RXConnector RFConverter Activates the standalone scenario and selects the RF input path for the measured RF signal For possible connector and converter values see chapter 6 1 4 Value...

Страница 38: ...nector Parameters RFInputExtAtt Range 50 dB to 90 dB RST 0 dB Example See Specifying General Measurement Settings Firmware Software V1 0 15 20 Manual operation See External Attenuation Input on page 2...

Страница 39: ...he external input attenua tion must be within the power range of the selected input connector refer to the data sheet Parameters UserMargin Range 0 dB to 55 dB External Attenuation Expected Nominal Po...

Страница 40: ...ABORt FMSTereo MEAS i MEValuation Starts stops or aborts the measurement INITiate starts or restarts the measurement the R S CMW enters the RUN state STOP causes a running measurement to stop after th...

Страница 41: ...the measurement substates Both measure ment substates are relevant for running measurements only Use FETCh STATe to query the main measurement state only Use INITiate STOP ABORt to change the measurem...

Страница 42: ...o MEAS i MEValuation AF FILTer DEEMphasis 45 CONFigure FMSTereo MEAS i MEValuation AF FILTer LPASs 45 CONFigure FMSTereo MEAS i MEValuation AF FILTer HPASs 45 CONFigure FMSTereo MEAS i MEValuation AF...

Страница 43: ...ration See Stop Condition on page 23 CONFigure FMSTereo MEAS i MOEXception MeasOnException Specifies whether measurement results that the R S CMW identifies as faulty or inac curate are rejected Param...

Страница 44: ...anual chapter Remote Con trol Parameters StatisticCount Number of measurement intervals for the RF Modulation mea surement Range 1 to 1000 RST 10 Example See Specifying Measurement Control Settings Fi...

Страница 45: ...Tereo MEAS i MEValuation AF FILTer LPASs Filter Selects the lowpass filter for the AF analyzer input path Parameters Filter OFF LP3 LP4 LP15 OFF Bypass lowpass filter stage filter off LP3 Select lowpa...

Страница 46: ...uencies for the AF Total Harmonic Distortion THD the Total Harmonic Distortion and Noise THD N SINAD and the SNR measurements Parameters ThdFreqLeft Range 1 Hz to 10 5E 3 Hz RST 1000 Hz Default unit H...

Страница 47: ...lt types Tip Use READ queries to retrieve results for disabled views Parameters Enable OFF ON ON Evaluate results and show view OFF Do not evaluate results hide view Example See Specifying Measurement...

Страница 48: ...h characterize the RF carrier properties and disables enables the limit check Parameters CarrierPowLower Lower limit for RF carrier power Range 80 dBm to 0 dBm RST 35 dBm CarrierPowUpper Upper limit f...

Страница 49: ...the FM modula tion of the measured RF signal Parameters PilotDevUpper Upper limit for pilot deviation Range 0 Hz to 10E 3 Hz RST 7000 Hz Default unit Hz RDSDevUpper Upper limit for RDS deviation Rang...

Страница 50: ...ble THDNEnab SNREnable Defines upper limits for the measurement results which characterize the measured AF signal and disables enables the limit check Parameters WeightedRmsUpp Upper limit for frequen...

Страница 51: ...on Results 54 AF Modulation Results 56 6 6 1 RF Carrier Results The following commands return the statistical RF Carrier results FETCh FMSTereo MEAS i MEValuation RFCarrier CURRent FETCh FMSTereo MEAS...

Страница 52: ...Range 0 Hz to 96 kHz Default unit Hz 6_MultDevPos Multiplex deviation Peak Range 96 kHz to 96 kHz Default unit Hz 7_MultDevNeg Multiplex deviation Peak Range 96 kHz to 96 kHz Default unit Hz 8_MultDe...

Страница 53: ...The values described below are returned by FETCh and READ commands CALCulate commands return limit check results instead one value for each result listed below The number to the left of each result p...

Страница 54: ...S i MEValuation RFModulation AVERage READ FMSTereo MEAS i MEValuation RFModulation MAXimum CALCulate FMSTereo MEAS i MEValuation RFModulation CURRent CALCulate FMSTereo MEAS i MEValuation RFModulation...

Страница 55: ...s the standard deviation of the RF Modulation results The values described below are returned by FETCh and READ commands CALCulate commands return limit check results instead one value for each result...

Страница 56: ...FMSTereo MEAS i MEValuation AFLeft AVERage 57 CALCulate FMSTereo MEAS i MEValuation AFLeft MAXimum 57 FETCh FMSTereo MEAS i MEValuation AFLeft SDEViation 58 READ FMSTereo MEAS i MEValuation AFLeft SD...

Страница 57: ...ues 1_Reliability See Reliability Indicator 2_OutOfTol Out of tolerance result i e percentage of measurement intervals in the statistics cycle CONFigure FMSTereo MEAS i MEValuation SCOunt AF on page 4...

Страница 58: ...ch result parameter is provided for easy identification of the parameter position within the result array Return values 1_Reliability See Reliability Indicator 2_OutOfTol Out of tolerance result i e p...

Страница 59: ...Ch FMSTereo MEAS i MEValuation AFRight AVERage FETCh FMSTereo MEAS i MEValuation AFRight MAXimum READ FMSTereo MEAS i MEValuation AFRight CURRent READ FMSTereo MEAS i MEValuation AFRight AVERage READ...

Страница 60: ...verage Range 0 Hz to 96 kHz Default unit Hz 5_THDPerc Total harmonic distortion in percent Range 0 to 100 Default unit 6_THDdB Total harmonic distortion in dB Range 120 dB to 0 dB Default unit dB 7_TH...

Страница 61: ...FMSTereo MEAS i MEValuation SCOunt AF on page 44 exceeding the speci fied limits see Limit Settings Range 0 to 100 Default unit 3_WeightedRMS Standard deviation of the frequency deviation measured wit...

Страница 62: ...iation of the carrier power Range 0 dB to 92 5 dB Default unit dB 11_AudioRightDev Standard deviation of the audio right deviation Range 0 Hz to 48 kHz Default unit Hz Example See Continuous and AF Me...

Страница 63: ...CONFigure FMSTereo MEAS i MEValuation AF FILTer HPASs 45 CONFigure FMSTereo MEAS i MEValuation AF FILTer LPASs 45 CONFigure FMSTereo MEAS i MEValuation AF FILTer WEIGhting 46 CONFigure FMSTereo MEAS i...

Страница 64: ...o MEAS i MEValuation 40 READ FMSTereo MEAS i MEValuation AFLeft AVERage 57 READ FMSTereo MEAS i MEValuation AFLeft CURRent 56 READ FMSTereo MEAS i MEValuation AFLeft MAXimum 57 READ FMSTereo MEAS i ME...

Страница 65: ...M Stereo Radio measurement 21 Frequency Offset FM Stereo Radio measurement 22 H Highpass FM Stereo Radio measurement 9 L Limits FM Stereo Radio measurement 24 Lowpass FM Stereo Radio measurement 9 M M...

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