Phase modulation flatness | VXI 3002 guide

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 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 Putting into storage CleaningFront panel connectors and indicators Disk installation/loading instructions Switching on Device talking elements IntroductionDevice listening elements Compound headers ProgrammingProgram messages 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 RFLVOFFS? RFLV?RFLVLIMIT? 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? SWEEPCFRQ? Sweep operationSweep 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 Frequency standard selection Reading error messagesOperating hours 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 Control ModulationFrequency generation Block schematic diagram Test precautions Acceptance Testing Executable soft front panel software Recommended test equipment Description Minimum specification Example SpecificationRF output Test equipment ALC linearity Test procedureRF level frequency response Measuring Attenuator accuracy Counter Carrier frequency accuracy Spectrum analyzer Spectral purityHarmonics Residual FM Non-harmonics SSB phase noise test set-up SSB phase noise FM deviation and distortion Internal FM FM scale shape Hz to 100 kHz Carrier errorExternal FM frequency response ALC off, DC coupled 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 External 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 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 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 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 45 External frequency standard tests Modulation oscillator frequency tests44 Modulation oscillator distortion and LF output 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 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