Amplitude modulation, AM or AM1 or AM2 | VXI 3002 instruction

Amplitude modulation

These commands enable you to select amplitude modulation either as a single modulation or as the sum of two signals, to set the AM depth as a percentage, and to switch the modulation on and off. You can set the modulation oscillator frequency and select between sine, triangle and square waveforms. Also the phase difference of modulation oscillator channel 2 relative to channel 1 can be offset in degrees to a resolution of 0.1°. Both modulation depth and modulation oscillator frequency can have their step sizes set and then be stepped up or down. And after having adjusted the modulation depth or the modulation oscillator frequency you can either return to the reference (depth or frequency) or make the current value the new reference.

AM or AM1 or AM2

:DEPTH

:INC

Data type : Allowed suffices :

Default suffix :

:<src>

:ON

:OFF

:UP

:DN

:RETN

:XFER

Data type :

Allowed suffices :

Default suffix :

Examples:

:MODF

:VALUE

:INC

Data type : Allowed suffices :

Default suffix :

:UP

:DN

:RETN

:XFER

:SIN

:TRI

:SQR

Data type : Allowed suffices :

Default suffix :

:PHASE

Examples:

Set AM Depth (short form)

Set AM Depth

Set AM step size

Decimal Numeric Program Data

PCT

PCT

Select modulation source where <src> is any one of: INT, EXTAC, EXTALC, or EXTDC

Turn AM ON (locally)

Turn AM OFF (locally)

Go UP one step

Go DOWN one step

Return to original setting

Transfer current value to be the new setting

None

None

None

AM:DEPTH 30.5PCT;EXTAC;ON

AM1:DEPTH 40PCT;INT;OFF

Set AM modulation oscillator frequency (short form) Set AM modulation oscillator frequency

Set AM modulation oscillator frequency step size Decimal Numeric Program Data

Any one of: GHZ, MHZ, KHZ or HZ HZ

Go UP one step Go DOWN one step Return to original setting

Transfer current value to be the new setting Select sinusoidal waveform

Select triangle waveform Select square waveform None

None

None

Set phase offset of AM2 relative to AM1

AM2:MODF:VALUE 15.5KHZ;TRI;INC 500HZ

AM:MODF:PHASE 5DEG

3-16

Image 46

VXI 3002 manual Amplitude modulation, AM or AM1 or AM2

Contents

3002 3002 Document conventions Intended audienceStructure Chapter Contents Preface Patent protection General conditions of use SymbolsSymbol Description Electrical hazards DC supply voltage Beryllia Fire hazardToxic hazards Beryllium copper Installation Suitability for use Conditions générales d’utilisation Symboles signalant un risqueSymbole Nature du risque Sécurité électrique tension d’alimentation continue Bronze au béryllium Risque lié au feuLe Béryllia UtilisationPage Allgemeine Hinweise zur Verwendung GefahrensymboleSymbol Gefahrenart Elektrische Schläge Gleichspannungsversorgung Beryllium Oxid BrandgefahrWarnung vor giftigen Substanzen Beryllium Kupfer Pericoli da elettricità alimentazione a c.c Simboli di pericoloCondizioni generali d’uso Simbolo Tipo di pericolo Berillio Pericolo dincendioPericolo sostanze tossiche Rame berillio Caratteristiche d’uso Nivel peligroso de electricidad tensión de alimentación DC Símbolos de peligroCondiciones generales de uso Símbolo Naturaleza del peligro Berilio Peligro de incendioAviso de toxicidad Berilio-cobre Idoneidad de uso Chapter ContentsMain features Introduction Memory IncrementingFrequency sweep Triggers Performance data FSK Phase ModulationFrequency Modulation Pulse Modulation External Modulation Input Sweep ModeInternal LF Generator Frequency Standard Electromagnetic Versions, options and accessoriesSafety Compatibility Reference No Title SafetyCertificate Ref. No. DC230 Qualifying Notes Initial visual inspection Setting logical addressList of figures Ventilation requirements Visual inspection Installing in VXI mainframeRoutine safety testing and inspection Rectification Front panel connectors and indicators CleaningPutting into storage Switching on Disk installation/loading instructions Device listening elements IntroductionDevice talking elements Program messages ProgrammingCompound headers Message exchange protocol Common commands and queries IeeeProgram data Mnemonic Device dependent commands OPC Default settings Instrument default settings Cfrq Carrier frequencyCFRQ? RF level Rflv RFLVLIMIT? RFLV?RFLVOFFS? Output Output controlOUTPUT? Mode Modulation modeValid Mode Combinations Table MODE? MOD Modulation controlMOD? Frequency modulation and FSK FM or FM1 or FM2 Dcfmnl FMMODF? or FM1MODF? or FM2MODF? Phase modulation PM or PM1 or PM2 PMMODF? or PM1MODF? Amplitude modulation AM or AM1 or AM2 AM? or AM1? or AM2? Pulse Pulse modulationPULSE? Carrier store Memory storesMemory store Full store Recalling default settings Memory-recall Memory erase Memory sequencing Mtrig Memory triggeringMemory protection MTRIG? Sweep Sweep operationSWEEPCFRQ? Sweep mode SWEEP? Halt Cont Reset Retn Xfer Sweep control Trigger Trigger sourceSources TRIGGERSOURCE? Attenuator lock ranges RF level Atten. lock Setting dBm Min. dBm Max. dBm FromAttenuator hold Atten Power-up options Reverse power protection Operating hours Reading error messagesFrequency standard selection Status byte Status data structure register model Standard event registers ESE ESE? Hardware event registers HSE? Coupling event registers CSE? Instrument event registers SSE SSE? Error Queue Queue flag details Status byte when read by *STB? SRE SRE? Status byte when read by serial poll Service Request Generation Service Request Enable Register# Summary of status reporting commands and queries Foreground errors Error handlingBackground errors Error queue Error Messages Background errors 500 599 in priority order Foreground errors 0 Ieee 488.2 errors 400 Frequency generation ModulationControl Block schematic diagram Acceptance Testing Test precautions Recommended test equipment Executable soft front panel software RF output SpecificationDescription Minimum specification Example Test equipment RF level frequency response Test procedureALC linearity Attenuator accuracy Measuring Carrier frequency accuracy Counter Harmonics Spectral puritySpectrum analyzer Non-harmonics Residual FM SSB phase noise SSB phase noise test set-up Internal FM FM deviation and distortion FM scale shape External FM frequency response ALC off, DC coupled Carrier errorHz to 100 kHz External FM frequency response ALC on Hz DC Phase modulation Phase modulation flatness AM depth and distortion Figure recorded in 5 20 log10 Figure recorded AM scale shape Test procedure Hz to 30 kHzExternal AM frequency response ALC off, DC coupled DVM Pulse modulation RF level frequency response 10 Pulse modulation test set-up Pulse modulation on/off ratio Function generator Modulation oscillator Pulse modulation rise and fall time Modulation oscillator frequencies Modulation oscillator distortion and LF output flatness External frequency standard input 15 External standard test set-up For 3002 Signal Generator, serial number RF output at −4 dBm RF output at +7 dBm RF output at +25 dBm +19 dBm ALC linearity at 2.5 MHz RF level dBm RF level min DBm Result dBm RF level max ALC linearity at 950 MHz ALC linearity at 1200 MHz ALC linearity at 1900 MHz ALC linearity at 2400 MHz Attenuator test at 2.6 MHz RF level dBm RF level min Result dBm RF level max DBm 10 Attenuator test at 480.1 MHz 11 Attenuator test at 1199 MHz 12 Attenuator test at 1875.1 MHz 13 Attenuator test at 2399 MHz 14 Carrier frequency tests Frequency MHz Frequency min Result MHz Frequency max 15 Carrier harmonic tests at −4 dBm 16 Carrier harmonic tests at +7 dBm 17 Carrier harmonic tests at +13 dBm 18 Carrier harmonic tests at +19 dBm 20 Residual FM test 21 SSB phase noise test19 Carrier non-harmonic tests Carrier frequency Residual FM Measured value Hz RMS 23 FM scale shape tests at 15 MHz carrier FM deviation kHz Result kHz Min. kHz Max. kHz 24 Carrier error test at 1.2 GHz, FM deviation 100 kHz Carrier error Result kHz 10.5 30 Internal AM depth and distortion tests at −4 dBm 29 Internal ΦM flatness test31 Internal AM depth and distortion tests at +7 dBm 32 Internal AM depth and distortion tests at +13 dBm 33 Internal AM depth and distortion tests at +19 dBm 34 AM scale shape test AM depth % AM depth min Result % Max. % 38 Pulse modulation RF output at −7 dBm 39 Pulse modulation RF output at +4 dBm 40 Pulse modulation RF output at +14 dBm Pulse modulation on/off ratio test 44 Modulation oscillator distortion and LF output tests Modulation oscillator frequency tests45 External frequency standard tests General description Acceptance testingAnnex a Operation Test procedure Spectrum analyzer Annex-A-3 Table A-1 Pulse mod. RF output at −7 dBm Table A-2 Pulse mod. RF output at +0 dBm Table A-3 Pulse mod. RF output at +16 dBm Table A-5 Pulse modulation rise and fall time test Table A-4 Pulse modulation on/off ratio testResult ns Software Licence and Warranty Indemnity UK Stevenage Email info-test@aeroflex.comChina Shanghai China Beijing