Manuals / VXI / Lawn and Garden / Portable Generator

VXI 3002 manual Annex a, General description, Operation, Acceptance testing

Models: 3002

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Annex A

OPTION 11 FAST PULSE MODULATION

General description

Option 11 adds the ability for the instrument to internally generate a fast pulse modulated waveform from logic levels applied to the PULSE INPUT socket. The pulse modulator is suitable for generating fast pulses with high isolation for applications in radar and EMI. It may be used in conjunction with other forms of modulation to form composite signals. Familiarity with normal operation of the signal generator is assumed.

Operation

Fast pulse modulation is automatically applied when Option 11 is fitted.

Acceptance testing

The following acceptance tests supersede those given under Pulse modulation in Chapter 5.

Pulse modulation

Specification

Pulse modulation
Carrier frequency range	100 kHz to 2.4 GHz, usable to 9 kHz.
RF output range	As standard instrument, with the exception that maximum output level
	is reduced by 3 dB when pulse modulation is enabled.
RF level accuracy	Additional ±0.01 dB/°C temperature coefficient when pulse modulation
	enabled.
	Adds ±0.25 dB for carrier frequencies below 10 MHz.
On/off ratio	>80 dBc below 1.2 GHz;
	>70 dBc up to 2.05 GHz (typically >80 dB);
	>65 dBc up to 2.4 GHz (typically >70 dB at 2.4 GHz).
Rise and fall time	<20 ns, typically 15 ns.
Maximum repetition frequency	10 MHz.
Control	50 Ω input impedance. A logic ‘1’ (2 to 5 V) turns the carrier on, a
	logic ‘0’ (0 to 0.8 V) turns the carrier off. Maximum input is ±10 V.
Test equipment

Alternative equipment may be used providing it complies with the stated minimum performance.

Description	Minimum specification	Example

Power meter	±0.1 dB from 9 kHz to 2.4 GHz	IFR 6960B and
		6912
Spectrum	Frequency coverage 100 kHz to 2.4 GHz	AnritsuMS2602A
analyzer
50 Ω load	1 W, 50 Ω nominal impedance, DC to 2.4 GHz	Lucas Weinschel
(termination)		M1404N
Oscilloscope	100 MHz bandwidth	Tektronix
		TDS 220
Function	DC to 10 kHz square wave	HP 3325B
generator
RF detector	100 kHz to 2 GHz	HP 8471D

Annex-A-1

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VXI 3002 manual Annex a, General description, Operation, Acceptance testing

Contents

3002 3002 Chapter Intended audienceStructure Document conventionsContents Patent protection PrefaceElectrical hazards DC supply voltage SymbolsSymbol Description General conditions of useBeryllium copper Fire hazardToxic hazards BerylliaSuitability for use InstallationSécurité électrique tension d’alimentation continue Symboles signalant un risqueSymbole Nature du risque Conditions générales d’utilisationUtilisation Risque lié au feuLe Béryllia Bronze au bérylliumPage Elektrische Schläge Gleichspannungsversorgung GefahrensymboleSymbol Gefahrenart Allgemeine Hinweise zur VerwendungBeryllium Kupfer BrandgefahrWarnung vor giftigen Substanzen Beryllium OxidSimbolo Tipo di pericolo Simboli di pericoloCondizioni generali d’uso Pericoli da elettricità alimentazione a c.cRame berillio Pericolo dincendioPericolo sostanze tossiche BerillioCaratteristiche d’uso Símbolo Naturaleza del peligro Símbolos de peligroCondiciones generales de uso Nivel peligroso de electricidad tensión de alimentación DCBerilio-cobre Peligro de incendioAviso de toxicidad BerilioIdoneidad de uso Introduction ContentsMain features ChapterTriggers IncrementingFrequency sweep MemoryPerformance data Pulse Modulation Phase ModulationFrequency Modulation FSKFrequency Standard Sweep ModeInternal LF Generator External Modulation InputCompatibility Versions, options and accessoriesSafety ElectromagneticQualifying Notes SafetyCertificate Ref. No. DC230 Reference No TitleVentilation requirements Setting logical addressList of figures Initial visual inspectionRectification Installing in VXI mainframeRoutine safety testing and inspection Visual inspectionFront panel connectors and indicators CleaningPutting into storage Disk installation/loading instructions Switching onDevice listening elements IntroductionDevice talking elements Program messages ProgrammingCompound headers Mnemonic Common commands and queries IeeeProgram data Message exchange protocolOPC Device dependent commandsInstrument default settings Default settingsCfrq Carrier frequencyCFRQ? Rflv RF levelRFLVLIMIT? RFLV?RFLVOFFS? Output Output controlOUTPUT? MODE? Modulation modeValid Mode Combinations Table ModeMOD 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? Full store Memory storesMemory store Carrier storeMemory-recall Recalling default settingsMemory sequencing Memory eraseMTRIG? Memory triggeringMemory protection MtrigSweep Sweep operationSWEEPCFRQ? SWEEP? Sweep modeSweep control Halt Cont Reset Retn XferTRIGGERSOURCE? Trigger sourceSources TriggerAtten RF level Atten. lock Setting dBm Min. dBm Max. dBm FromAttenuator hold Attenuator lock rangesReverse power protection Power-up optionsOperating hours Reading error messagesFrequency standard selection 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 Error queue Error handlingBackground errors Foreground errorsBackground errors 500 599 in priority order Error MessagesForeground errors 0 Ieee 488.2 errors 400 Frequency generation ModulationControl Block schematic diagram Test precautions Acceptance TestingExecutable soft front panel software Recommended test equipmentTest equipment SpecificationDescription Minimum specification Example RF outputRF level frequency response Test procedureALC linearity Measuring Attenuator accuracyCounter Carrier frequency accuracyHarmonics Spectral puritySpectrum analyzer Residual FM Non-harmonicsSSB phase noise test set-up SSB phase noiseFM deviation and distortion Internal FMFM scale shape External FM frequency response ALC off, DC coupled Carrier errorHz to 100 kHz Hz DC External FM frequency response ALC onPhase modulation flatness Phase modulationFigure recorded in 5 20 log10 Figure recorded AM depth and distortionAM scale shape Test procedure Hz to 30 kHzExternal AM frequency response ALC off, DC coupled 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 Carrier frequency Residual FM Measured value Hz RMS 21 SSB phase noise test19 Carrier non-harmonic tests 20 Residual FM testFM 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 30 Internal AM depth and distortion tests at −4 dBm 29 Internal ΦM flatness test31 Internal AM depth and distortion tests at +7 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 dBm44 Modulation oscillator distortion and LF output tests Modulation oscillator frequency tests45 External frequency standard tests Operation Acceptance testingAnnex a General descriptionSpectrum 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 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 China Beijing Email info-test@aeroflex.comChina Shanghai UK Stevenage