Internal FM, FM deviation and distortion | VXI 3002 manual

Internal FM

Specification

Deviation range	0 to 100 kHz.
Resolution	3 digits or 1 Hz.
Accuracy	±5% at 1 kHz modulation rate.
Bandwidth (1 dB)	DC to 100 kHz (DC coupled),
	10	Hz to 100 kHz (AC coupled),
	20	Hz to 100 kHz (AC coupled with ALC).

Carrier frequency offset Distortion

FSK

Less than 1% of the set frequency deviation when DC coupled.

Less than 3% at 1 kHz rate for deviations up to 100 kHz. Typically <0.5% at 1 kHz rate for deviations up to 10 kHz.

2 level or 4 level FSK.

Note that 4 FSK is not available with Option 11 Fast Pulse fitted.

Test equipment

Description	Minimum specification	Example


Modulation meter	FM accuracy ±1% at 1 kHz modulation frequency	IFR 2305 with
		distortion option
DVM	DC voltage measurement	Solartron 7150+
50 Ω load	1 W, 50 Ω nominal impedance, DC to 2.4 GHz	Lucas Weinschel
(termination)		M1404N
Audio analyzer	Capable of measuring THD of 0.01% from 100 Hz	Rohde &
	to 20 kHz	Schwarz UPA3
Function	DC to 100 kHz sine, ±0.6 dB flatness	Agilent 3325B
generator

FM deviation and distortion

Test procedure

	2305
UUT	Modulation meter
UUT
RF OUT	RF INPUT
	C2564

Fig. 5-7 Internal modulation and modulation distortion test set-up

5-10

Image 85

VXI 3002 manual Internal FM, FM deviation and distortion

Contents

3002 3002 Structure Intended audienceDocument conventions Chapter Contents Patent protection Preface Symbol Description SymbolsGeneral conditions of use Electrical hazards DC supply voltage Toxic hazards Fire hazardBeryllia Beryllium copper Suitability for use Installation Symbole Nature du risque Symboles signalant un risqueConditions générales d’utilisation Sécurité électrique tension d’alimentation continue Le Béryllia Risque lié au feuBronze au béryllium UtilisationPage Symbol Gefahrenart GefahrensymboleAllgemeine Hinweise zur Verwendung Elektrische Schläge Gleichspannungsversorgung Warnung vor giftigen Substanzen BrandgefahrBeryllium Oxid Beryllium Kupfer Condizioni generali d’uso Simboli di pericoloPericoli da elettricità alimentazione a c.c Simbolo Tipo di pericolo Pericolo sostanze tossiche Pericolo dincendioBerillio Rame berillio Caratteristiche d’uso Condiciones generales de uso Símbolos de peligroNivel peligroso de electricidad tensión de alimentación DC Símbolo Naturaleza del peligro Aviso de toxicidad Peligro de incendioBerilio Berilio-cobre Idoneidad de uso Main features ContentsChapter Introduction Frequency sweep IncrementingMemory Triggers Performance data Frequency Modulation Phase ModulationFSK Pulse Modulation Internal LF Generator Sweep ModeExternal Modulation Input Frequency Standard Safety Versions, options and accessoriesElectromagnetic Compatibility Certificate Ref. No. DC230 SafetyReference No Title Qualifying Notes List of figures Setting logical addressInitial visual inspection Ventilation requirements Routine safety testing and inspection Installing in VXI mainframeVisual inspection Rectification Front panel connectors and indicators CleaningPutting into storage Disk installation/loading instructions Switching on Device listening elements IntroductionDevice talking elements Program messages ProgrammingCompound headers Program data Common commands and queries IeeeMessage exchange protocol Mnemonic OPC Device dependent commands Instrument default settings Default settings Cfrq Carrier frequencyCFRQ? Rflv RF level RFLVLIMIT? RFLV?RFLVOFFS? Output Output controlOUTPUT? Valid Mode Combinations Table Modulation modeMode MODE? MOD Modulation controlMOD? FM or FM1 or FM2 Frequency modulation and FSK FMMODF? or FM1MODF? or FM2MODF? Dcfmnl PM or PM1 or PM2 Phase modulation PMMODF? or PM1MODF? AM or AM1 or AM2 Amplitude modulation AM? or AM1? or AM2? Pulse Pulse modulationPULSE? Memory store Memory storesCarrier store Full store Memory-recall Recalling default settings Memory sequencing Memory erase Memory protection Memory triggeringMtrig MTRIG? Sweep Sweep operationSWEEPCFRQ? SWEEP? Sweep mode Sweep control Halt Cont Reset Retn Xfer Sources Trigger sourceTrigger TRIGGERSOURCE? Attenuator hold RF level Atten. lock Setting dBm Min. dBm Max. dBm FromAttenuator lock ranges Atten Reverse power protection Power-up options Operating hours Reading error messagesFrequency standard selection Status byte Status data structure register model ESE ESE? Standard event registers HSE? Hardware event registers CSE? Coupling event registers SSE SSE? Instrument event registers Queue flag details Error Queue SRE SRE? Status byte when read by *STB? Service Request Generation Service Request Enable Register# Status byte when read by serial poll Summary of status reporting commands and queries Background errors Error handlingForeground errors Error queue Background errors 500 599 in priority order Error Messages Foreground errors 0 Ieee 488.2 errors 400 Frequency generation ModulationControl Block schematic diagram Test precautions Acceptance Testing Executable soft front panel software Recommended test equipment Description Minimum specification Example SpecificationRF output Test equipment RF level frequency response Test procedureALC linearity Measuring Attenuator accuracy Counter Carrier frequency accuracy Harmonics Spectral puritySpectrum analyzer Residual FM Non-harmonics SSB phase noise test set-up SSB phase noise FM deviation and distortion Internal FM FM scale shape External FM frequency response ALC off, DC coupled Carrier errorHz to 100 kHz Hz DC External FM frequency response ALC on Phase modulation flatness Phase modulation Figure recorded in 5 20 log10 Figure recorded AM depth and distortion AM 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 response Function generator Pulse modulation on/off ratio Pulse modulation rise and fall time Modulation oscillator Modulation oscillator distortion and LF output flatness Modulation oscillator frequencies 15 External standard test set-up External frequency standard input RF output at −4 dBm For 3002 Signal Generator, serial number RF output at +7 dBm +19 dBm RF output at +25 dBm RF level dBm RF level min DBm Result dBm RF level max ALC linearity at 2.5 MHz ALC 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 MHz 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 Frequency MHz Frequency min Result MHz Frequency max 14 Carrier frequency tests 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 19 Carrier non-harmonic tests 21 SSB phase noise test20 Residual FM test Carrier frequency Residual FM Measured value Hz RMS FM deviation kHz Result kHz Min. kHz Max. kHz 23 FM scale shape tests at 15 MHz carrier Carrier error Result kHz 24 Carrier error test at 1.2 GHz, FM deviation 100 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 33 Internal AM depth and distortion tests at +19 dBm 32 Internal AM depth and distortion tests at +13 dBm AM depth % AM depth min Result % Max. % 34 AM scale shape test 38 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 dBm 44 Modulation oscillator distortion and LF output tests Modulation oscillator frequency tests45 External frequency standard tests Annex a Acceptance testingGeneral description Operation Spectrum analyzer Test procedure 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 China Shanghai Email info-test@aeroflex.comUK Stevenage China Beijing