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VXI 3002 manual Phase modulation flatness

Models: 3002

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Phase modulation

Specification

Deviation	0 to 10 radians.
Resolution	3 digits or 0.01 radians.
Accuracy at 1 kHz	±5% of indicated deviation excluding residual phase modulation.
Bandwidth (3 dB)	100 Hz to 10 kHz.
Distortion	Less than 3% at 10 radians at 1 kHz modulation rate. Typically <0.5% for deviations up
	to 1 radian at 1 kHz.
Test equipment

Description

Minimum specification

Example

Modulation meter

ΦM and FM accuracy ±2% at 1 kHz modulation frequency

IFR 2305 with distortion option

Phase modulation

Test procedure

(1)Connect the test equipment as shown in Fig. 5-7.

(2)On the UUT set:

Carr Freq	10.5 MHz
RF Level	0 dBm
Source On
Mod Mode	PM Internal
PM1 Level	10 rad

(3)On the modulation meter, select CAL, ΦM.

(4)Measure the ΦM accuracy and distortion checking that the results are within the specification shown in Table 5-28.

Phase modulation flatness

Test procedure

For this test, the phase modulation figures are calculated from readings taken with the modulation meter set to FM. No allowances need to be made for the modulation source frequency accuracy since it is derived from the reference oscillator in the UUT.

(1)Connect the test equipment as shown in Fig. 5-7.

(2)On the UUT set:

Carr Freq	15 MHz
RF Level	0 dBm
Mod Mode	PM Internal
Source On
Mod On
PM1 Level	10 rad

(3)On the modulation meter, select CAL, FM, 50 Hz 15 kHz LF filter.

(4)Measure the deviation on the modulation meter and calculate the phase modulation using the formula:

Φ= FM dev (Hz)

M

mod freq (Hz)

(5)On the UUT set mod source to each of the frequencies shown in Table 5-29, measure the deviation on the modulation meter and calculate the phase modulation for each step using the formula in (4).

5-14

Image 89

VXI 3002 manual Phase modulation flatness

Contents

3002 3002 Structure Intended audienceDocument conventions ChapterContents Patent protection PrefaceSymbol Description SymbolsGeneral conditions of use Electrical hazards DC supply voltageToxic hazards Fire hazardBeryllia Beryllium copperSuitability for use InstallationSymbole Nature du risque Symboles signalant un risqueConditions générales d’utilisation Sécurité électrique tension d’alimentation continueLe Béryllia Risque lié au feuBronze au béryllium UtilisationPage Symbol Gefahrenart GefahrensymboleAllgemeine Hinweise zur Verwendung Elektrische Schläge GleichspannungsversorgungWarnung vor giftigen Substanzen BrandgefahrBeryllium Oxid Beryllium KupferCondizioni generali d’uso Simboli di pericoloPericoli da elettricità alimentazione a c.c Simbolo Tipo di pericoloPericolo sostanze tossiche Pericolo dincendioBerillio Rame berillioCaratteristiche d’uso Condiciones generales de uso Símbolos de peligroNivel peligroso de electricidad tensión de alimentación DC Símbolo Naturaleza del peligroAviso de toxicidad Peligro de incendioBerilio Berilio-cobreIdoneidad de uso Main features ContentsChapter IntroductionFrequency sweep IncrementingMemory TriggersPerformance data Frequency Modulation Phase ModulationFSK Pulse ModulationInternal LF Generator Sweep ModeExternal Modulation Input Frequency StandardSafety Versions, options and accessoriesElectromagnetic CompatibilityCertificate Ref. No. DC230 SafetyReference No Title Qualifying NotesList of figures Setting logical addressInitial visual inspection Ventilation requirementsRoutine safety testing and inspection Installing in VXI mainframeVisual inspection RectificationPutting into storage CleaningFront panel connectors and indicators Disk installation/loading instructions Switching onDevice talking elements IntroductionDevice listening elements Compound headers ProgrammingProgram messages Program data Common commands and queries IeeeMessage exchange protocol MnemonicOPC Device dependent commandsInstrument default settings Default settingsCFRQ? Carrier frequencyCfrq Rflv RF levelRFLVOFFS? RFLV?RFLVLIMIT? OUTPUT? Output controlOutput Valid Mode Combinations Table Modulation modeMode MODE?MOD? Modulation controlMOD FM or FM1 or FM2 Frequency modulation and FSKFMMODF? or FM1MODF? or FM2MODF? DcfmnlPM or PM1 or PM2 Phase modulationPMMODF? or PM1MODF? AM or AM1 or AM2 Amplitude modulationAM? or AM1? or AM2? PULSE? Pulse modulationPulse Memory store Memory storesCarrier store Full storeMemory-recall Recalling default settingsMemory sequencing Memory eraseMemory protection Memory triggeringMtrig MTRIG?SWEEPCFRQ? Sweep operationSweep SWEEP? Sweep modeSweep control Halt Cont Reset Retn XferSources Trigger sourceTrigger TRIGGERSOURCE?Attenuator hold RF level Atten. lock Setting dBm Min. dBm Max. dBm FromAttenuator lock ranges AttenReverse power protection Power-up optionsFrequency standard selection Reading error messagesOperating hours Status byte Status data structure register model ESE ESE? Standard event registersHSE? Hardware event registersCSE? Coupling event registersSSE SSE? Instrument event registersQueue flag details Error QueueSRE SRE? Status byte when read by *STB?Service Request Generation Service Request Enable Register# Status byte when read by serial pollSummary of status reporting commands and queries Background errors Error handlingForeground errors Error queueBackground errors 500 599 in priority order Error MessagesForeground errors 0 Ieee 488.2 errors 400 Control ModulationFrequency generation Block schematic diagram Test precautions Acceptance TestingExecutable soft front panel software Recommended test equipmentDescription Minimum specification Example SpecificationRF output Test equipmentALC linearity Test procedureRF level frequency response Measuring Attenuator accuracyCounter Carrier frequency accuracySpectrum analyzer Spectral purityHarmonics Residual FM Non-harmonicsSSB phase noise test set-up SSB phase noiseFM deviation and distortion Internal FMFM scale shape Hz to 100 kHz Carrier errorExternal FM frequency response ALC off, DC coupled Hz DC External FM frequency response ALC onPhase modulation flatness Phase modulationFigure recorded in 5 20 log10 Figure recorded AM depth and distortionExternal AM frequency response ALC off, DC coupled Test procedure Hz to 30 kHzAM scale shape DVM 10 Pulse modulation test set-up Pulse modulation RF level frequency responseFunction generator Pulse modulation on/off ratioPulse modulation rise and fall time Modulation oscillatorModulation oscillator distortion and LF output flatness Modulation oscillator frequencies15 External standard test set-up External frequency standard inputRF output at −4 dBm For 3002 Signal Generator, serial numberRF output at +7 dBm +19 dBm RF output at +25 dBmRF level dBm RF level min DBm Result dBm RF level max ALC linearity at 2.5 MHzALC linearity at 950 MHz ALC linearity at 1200 MHz ALC linearity at 1900 MHz ALC linearity at 2400 MHz RF level dBm RF level min Result dBm RF level max DBm Attenuator test at 2.6 MHz10 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 Frequency MHz Frequency min Result MHz Frequency max 14 Carrier frequency tests15 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 19 Carrier non-harmonic tests 21 SSB phase noise test20 Residual FM test Carrier frequency Residual FM Measured value Hz RMSFM deviation kHz Result kHz Min. kHz Max. kHz 23 FM scale shape tests at 15 MHz carrierCarrier error Result kHz 24 Carrier error test at 1.2 GHz, FM deviation 100 kHz10.5 31 Internal AM depth and distortion tests at +7 dBm 29 Internal ΦM flatness test30 Internal AM depth and distortion tests at −4 dBm 33 Internal AM depth and distortion tests at +19 dBm 32 Internal AM depth and distortion tests at +13 dBmAM depth % AM depth min Result % Max. % 34 AM scale shape test38 Pulse modulation RF output at −7 dBm 39 Pulse modulation RF output at +4 dBm Pulse modulation on/off ratio test 40 Pulse modulation RF output at +14 dBm45 External frequency standard tests Modulation oscillator frequency tests44 Modulation oscillator distortion and LF output tests Annex a Acceptance testingGeneral description OperationSpectrum analyzer Test procedureAnnex-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 Result ns Table A-4 Pulse modulation on/off ratio testTable A-5 Pulse modulation rise and fall time test Software Licence and Warranty Indemnity China Shanghai Email info-test@aeroflex.comUK Stevenage China Beijing