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Agilent Technologies Agilent 86120C MEASureARRay SCALar POWerFREQuen- cy?, CONFigure command

Models: Agilent 86120C

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MEASure{:ARRay [:SCALar]} :POWer:FREQuen- cy?

Programming Commands

Measurement Instructions

MEASure{:ARRay [:SCALar]} :POWer:FREQuen- cy?

Returns frequency values.

Syntax	:POWer:FREQuency? [<expected_value>[,<resolution>]]

	Used With	<expected_value>	<resolution>

	SCALar	optional	optional
	ARRay	ignoreda	optional

a. Although ignored, this argument must be present if the resolution argument is specified.

Description When used with a :SCALar command, a single value is returned. The display is placed in the single- wavelength mode, and the marker is placed on the signal having a frequency that is closest to the <expected_value> parameter. Default units for <expected_value> parameter are in Hz. When used with an :ARRay command, an array of frequencies is returned. The display is placed in the list- by- wave- length mode.

The <resolution> parameter sets the resolution of the measurement. It is a unitless number whose value will be limited to either 0.01 or 0.001 (whichever is closer). MAXimum resolution is equivalent to the FAST measurement update mode. MINimum resolution is equivalent to the NORMAL measurement update mode.

Returned values are in Hz (display is in THz). Power units are not affected.

CONFigure command

When this function is used with the CONFigure command, the query question mark character “?” must not be included in the string. However, the FETCh, READ, and MEASure command are queries and require the question mark. Refer to the examples for this command.

<expected_value> MAXimum		The highest frequency signal
Constants	MINimum	The lowest frequency signal

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Image 147

Agilent Technologies Agilent 86120C manual MEASureARRay SCALar POWerFREQuen- cy?, CONFigure command

Contents

Agilent 86120C Multi-Wavelength Meter User’s Guide Notices The Agilent 86120C-At a Glance angled physical contact interfaceCharacterize laser lines easily Program the instrument for automatic measurements “Programming” and Chapter 4, “Programming Commands” provide allmust not be exceeded Print measurement resultsThe Agilent 86120C-At a Glance Measurement accuracy-it’s up to youThere is no output laser aperture General Safety ConsiderationsWA R N I N G WA R N I N G WA R N I N G WA R N I N G WA R N I N G C A U T I O N C A U T I O N C A U T I O N C A U T I O N C A U T I O N Returning the Instrument for Service ContentsThe Agilent 86120C-At a Glance General Safety Considerations Step 2. Connect the Line-Power Cable 5 Step 3. Connect a PrinterTest 1. Absolute Wavelength Accuracy 3 Test 2. Sensitivity Laser Safety InformationInstrument Preset Conditions FETCh Measurement Instruction 79 HCOPy SubsystemContents-3 Menu Maps Error Messages Front-Panel Fiber-Optic Adapters Power CordsAgilent Technologies Service Offices ContentsPage Step 1. Inspect the Shipment Getting StartedC A U T I O N C A U T I O N C A U T I O N C A U T I O N Getting StartedGetting Started Measurement accuracy-it’s up to youStep 1. Inspect the Shipment Step 1. Inspect the ShipmentStep 2. Connect the Line- Power Cable WA R N I N GC A U T I O N C A U T I O N C A U T I O N page 7 Step 3. Connect a PrinterInstrument firmware version Step 4. Turn on the Agilent 86120CConverting feet to meters Step 5. Enter Your ElevationDefinition of standard air Step 6. Select Medium for Wavelength ValuesStep 7. Turn Off Wavelength Limiting Returning the Instrument for Service C A U T I O N C A U T I O N Preparing the instrument for shippingThe carton must be large enough to allow approximately 7 cm Returning the Instrument for Service Getting Started1-14 Returning the Instrument for Service Getting Started1-15 Page Measuring Total Power Greater than 10 dBm Measuring Wavelength and PowerMeasuring Signal- to- Noise Ratios Measuring Signal- to- Noise Ratios with AveragingAgilent 86120C, refer to “Calibrating Measurements” on page 2 Making MeasurementsGraphical display of optical power spectrum 2 Instrument states 2 Measuring Wavelength and PowerPeak WL mode 2 List by WL or Power modes 2 Total power and average wavelength 2Peak WL mode To display peak wavelength and powerNEXT PK to select next higher power signal 3 To move the cursor to view other signals, pressPEAK to signal with greatest power PREV PK to select next lower power signalTo display multiple laser lines List by WL or Power modesTotal power and average wavelength n is the number of laser lines included in the measurement To display average wavelength and total powerLimiting the wavelength measurement range To limit the wavelength rangeTo measure broadband devices Measuring broadband devices and chirped lasersTo see the graphical display Graphical display of optical power spectrumTo save an instrument state Power barTo control the power bar Instrument statesDisplayed units 2 Measurement rate Changing the Units and Measurement RateDisplayed units To change the units of measureMeasurement rate Continuous or single measurements To change the measurement speedTo select single measurement acquisition Defining Laser- Line Peaks To define laser- line peaks If too many lines are identified Measuring Laser Separation Channel separation 2 Measuring flatness 2This section includes Channel separation To measure channel separation To measure flatness Measuring flatnessMeasuring Laser Drift Measuring Laser DriftIf measurement updating stops or the values become blanked To measure driftDuring the measurement, you can change the display mode to Peak WL Signal-to-noise display Measuring Signal- to- Noise RatiosAutomatic When the signal- to- noise “auto” function is selected, the Repetitive data formats Automatic interpolationTo measure signal- to- noise Measuring Signal- to- Noise Ratios with Averaging To measure signal- to- noise with averaging To characterize a Fabry- Perot laser Measuring Fabry- Perot FP LasersΣ Pi The summation of the power in each of the selected peaks, or Measuring Modulated Lasers Measuring Modulated LasersPRBS modulation graph showing raised noise floor To measure total power exceeding 10 dBm Measuring Total Power Greater than 10 dBmDefinition of standard air Calibrating MeasurementsTo enter the elevation To select the medium for lightConverting feet to meters To create a hardcopy Printing Measurement ResultsChoosing the Right Connector Cleaning Connections for Accurate MeasurementsFigure 2-3. Basic components of a connector Figure 2-4. Universal adapters to Diamond HMS-10 Figure 2-5. Cross-section of the Diamond HMS-10 connectorInspecting Connectors Avoid matching gel and oils Avoid over tightening connections Measuring insertion loss and return loss Visual inspection of fiber ends Cleaning Connectorsleave filmy deposits on fiber ends that can degrade performance To clean a non- lensed connectormanufacturer for information on application and cleaning procedures think the use of such compounds is necessary, refer to the compoundcompressed air canister To clean an adapter2 Clean the adapter with the foam swab Making Measurements Lists of Commands 3Programming Addressing and Initializing the Instrument 3Where to begin… Types of commandsProgramming Addressing and Initializing the Instrument Remote mode and front- panel lockoutInitialize the instrument at start of every program Set single acquisition mode To change the GPIB addressMaking Measurements After collecting the uncorrected data, the Agilent 86120C searches the data for the first 200 peak responses. For WLIMitOFF, searching starts at 1650 nm and progresses towards 1270 nm. For WLIMitON, searching starts at WLIMitSTART and progresses toward WLIMitSTOP. These peak values are then placed into the corrected data buffer. Each peak value consists of an amplitude and wavelength measurement. Amplitude and wavelength correction factors are applied to this data Commands are grouped in subsystems page Table 2-4. Commands for Capturing DataMaking Measurements Refer to “FPERotSTATE” onMeasurement instructions give quick results MEASure commandFETCh command READ commandReturn single or multiple measurement values CONFigure commandARRay and the SCPI standard Or, the *WAI command could be used Measure delta, drift, and signal- to- noise Data can be corrected for elevation and vacuum The format of returned dataMeasurements are returned as strings Determine the number of data pointsMonitoring the Instrument Monitoring the InstrumentStatus Byte register Status registersProgramming Monitoring the Instrument3-18 Table 3-6. Bits in Operation Status Register OPERation Status and QUEStionable Status registersStandard Event Status register Enabling register bits with masks Error queue QueuesOutput queue Use either short or long forms SCPI command are grouped in subsystemsSending a command Reviewing SCPI Syntax RulesYou can use upper or lowercase letters Combine commands in the same subsystemWhite space Combine commands from different subsystemsSending common commands Adding parameters to a commandMnemonic 0.28E2 280E-1 28000m 0.028K 28E-3KTable 3-9. Suffix Multipliers MultiplierQuerying data Program message terminatorSetese subroutine Errormsg subroutineExample Programs Many subroutines are repeated in the examplesTempo subroutine FNIdentity functionErrmngmt subroutine Cmdopc subroutinePRINT Errmsg$ Example 1. Measure a DFB laserCOM /Instrument/ @Mwm DIM Errmsg$255 INTEGER Cme CLEAR REPEAT OUTPUT @Mwm*ESR? ENTER @MwmCme OUTPUT @MwmSYSTERR? ENTER @MwmErrmsg$ENTER @MwmIdentity$ RETURN Identity$ Example ProgramsCOM /Instrument/ @MwmV DIM Identity$50 Identity$= OUTPUT @Mwm*RST OUTPUT @Mwm*OPC? ENTER @MwmOpcdone OUTPUT @Mwm*IDN?Example Programs Example 2. Measure WDM channelsCOM /Instrument/ @Mwm OUTPUT @Mwm *ESEIVAL00110100,2 Example ProgramsPRINT Errmsg$ UNTIL NOT BITCme,2 AND NOT BITCme,4 AND NOT BITCme,5 AND Err$,+0Turn on drift reference state Example 3. Measure WDM channel driftTurn on the drift calculation Turn off all drift statesTurn on drift max min calculation Query reference wavelengths and powersExample Programs Turn off drift reference stateSUBEND IdentityDEF FNIdentity$ ProgrammingExample Programs SubendSUBEND SeteseSUB SetesePRINT USING 6A,2D,17A,M4D.3D,31A,S2D.2D,4ALine I wavelength is Example 4. Measure WDM channel separationExample Programs Example Programs Example 5. Measure signal- to- noise ratio of each WDM channelFOR I=1 TO Nbpt NEXT STOP ErrormsgProgramming Example ProgramsExample 6. Increase a source’s wavelength accuracy OUTPUT @MwmMEASSCALPOWWAV? ENTER @MwmCurrentwl Example ProgramsLists of Commands Table 3-10. Programming Commands 1 ofLists of Commands Lists of Commands Table 3-10. Programming Commands 2 ofLists of Commands Table 3-10. Programming Commands 3 ofLists of Commands Table 3-10. Programming Commands 4 ofTable 3-10. Programming Commands 5 of Lists of CommandsTable 3-11. Keys Versus Commands 1 of Lists of Commands∆ WL Lists of Commands Table 3-11. Keys Versus Commands 2 ofLists of Commands Programming3-50 CALCulate2 Subsystem 4 CALCulate3 Subsystem 4 Programming CommandsCommon Commands 4 Measurement Instructions 4 CALCulate1 Subsystem 4 CONFigure Measurement Instruction 4 DISPlay Subsystem 4Programming Commands Table 4-12. Notation Conventions and DefinitionsProgramming Commands Common Commands Example Query ResponseExample ESR?Syntax*ESR? Query ResponseIDN? Page Syntax*RST Table 4-15. Conditions Set by *RST Reset 2 of Page Query Response In this example, the command enables ESB event summary bit 5 inthe status byte register to generate a service request Common CommandsSTB? TST? Syntax*WAI Measurement Instructions Measurement InstructionsMeasurement Instructions POWer? FREQuency? WAVelength? WNUMber?The commands in this subsystem have the following command hierar- chy MEASure READ? FETCh? CONFigure? ARRay SCALarCONFigure command MEASureARRay SCALar POWer?Examples CONFARRPOW FETCARRPOW? READARRPOW? MEASARRPOW? CONFigure command MEASureARRay SCALar POWerFREQuen- cy?The following line is an example of a returned string when CONFigure command MEASureARRay SCALar POWerWAVe- length?Query Response resolutionConstants Examplesexpectedvalue MAXimum MEASureARRay SCALar POWerWNUMber?CONFigure command SyntaxIf the MEASSCALPOWWNUM? 6451 command is sent, and a FREQuency POINts CALCulate1 Subsystemtions” on page 4 DATA?or, 1557.137 nm in vacuum CALCulate1 Subsystem Non-sequential command TRANsformFREQuencyPOINtsthat is located in “Making Measurements” on page 3- 5 . Changing the +7,525 For normal updateFor fast update +15,047WNUMber CALCulate2 SubsystemSTATe STATe STARt FREQuency WAVelength WNUMber STOP FREQuency WAVelengthQueries the array of laser-line wavelengths after the peak search completed. If CALC2PWAVSTAT is on, the total input power isDATA? Queries the array of laser-line frequencies after the peak search isSummary PEXCursionSyntax AttributeSyntax POINts?PTHReshold Non-sequential commandPWAVerageSTATe “Defining Laser- Line Peaks” on page 2Non-sequential command CALCulate2 Subsystem Attribute WLIMitSTATeNon-sequential command SyntaxNon-sequential command WLIMitSTARtFREQuencyAttribute WLIMitSTARtWAVelengthNon-sequential command SyntaxAttribute WLIMitSTARtWNUMberNon-sequential command SyntaxAttribute WLIMitSTOPFREQuencyNon-sequential command SyntaxAttribute WLIMitSTOPWAVelengthNon-sequential command SyntaxAttribute WLIMitSTOPWNUMberNon-sequential command SyntaxCALCulate3 Subsystem WNUMber? SIGMa WAVelength? FREQuency? WNUMber? WAVelength? FREQuency? WNUMber? POWer? POWer WAVelength? FREQuency?STATE FWHM WAVelength? FREQuency? WNUMber? MEAN WAVelength? FREQuency? WNUMber? MODE WAVelength? FREQuency? WNUMber? PEAKSummary ASNRCLEarSyntax AttributeSummary ASNRCOUNtSyntax Attributetion on selecting measurements ASNRSTATeQueries the array of laser-line wave numbers after the calculation DATA?Queries the array of laser-line frequencies after the calculation is Queries the array of laser-line wavelengths after the calculation isAttribute DELTaPOWerSTATeDELTaPRESet Syntax181.6924 THz DELTaREFerencePOWer?DELTaREFerenceFREQuency DescriptionSummary DELTaREFerenceWAVelengthSyntax AttributeSummary DELTaREFerenceWNUMberSyntax AttributeSummary DELTaWAVelengthSTATeSyntax AttributeDELTaWPOWerSTATe Summary DRIFtDIFFerenceSTATeSyntax AttributeSummary DRIFtMAXimumSTATeSyntax AttributeSummary DRIFtMINimumSTATeSyntax AttributeAttribute DRIFtPRESetDRIFtREFerenceRESet SyntaxSummary DRIFtREFerenceSTATeSyntax AttributeSummary DRIFtSTATeSyntax Attribute+6.93436400E+011 FPERotSTATEFPERotFWHM? +5.47128800E-009+6.49865400E+003 FPERotMEAN?+1.53878000E-006 +1.94824800E+014WAVelength FPERotMODESPACing?Argument Description+6.49041000E+003 FPERotPEAK?+1.54073400E-006 +1.94577600E+014watts WATTs FPERotPOWer?WATTs dBm DBMWAVelength FPERotSIGMa?Argument DescriptionAttribute PRESetPOINts? SyntaxSummary SNRAUTOSyntax AttributeSummary SNRREFerenceFREQuencySyntax AttributeSummary SNRREFerenceWAVelengthSyntax AttributeSummary SNRREFerenceWNUMberSyntax AttributeRST State off Turns the signal- to- noise calculation on and offPreset State off SNRSTATeCONFigure Measurement Instruction CONFigure Measurement InstructionDISPlay Subsystem DISPlay SubsystemMAXimum LEFT NEXT PREVious RIGHt GRAPhics STATeAttribute MARKerMAXimumMARKerMAXimumLEFT SyntaxAttribute MARKerMAXimumNEXTMARKerMAXimumPREVious SyntaxAttribute MARKerMAXimumRIGHtWINDowGRAPhicsSTATe SyntaxFETCh Measurement Instruction FETCh Measurement InstructionIMMediate HCOPy SubsystemMEASure Measurement Instruction MEASure Measurement InstructionREAD Measurement Instruction READ Measurement InstructionDATA? SENSe SubsystemDEVice ELEVations MEDium OFFSet MAGNitude SENSe CORRectionpage 4 CORRectionDEViceSyntax CORRectionELEVation0Description Non-sequential commandSummary CORRectionMEDiumSyntax AttributeSummary CORRectionOFFSetMAGNitudeSyntax Attributefor 30 or 40 seconds ment of an instrument function. Refer to “Measurement Instructions”on page DATA?Query Response The following string shows an example of the first few measurements returned by this query STATus Subsystem STATus SubsystemOPERation QUEStionableCONDition? page 3STATus Subsystem Summary OPERation QUEStionableENABleSyntax AttributeAttribute OPERation QUEStionableEVENtSyntax Query ResponseSummary OPERation QUEStionableNTRansitionSyntax AttributeSummary OPERation QUEStionablePTRansitionSyntax AttributePRESet Table 4-18. Preset ValuesSYSTem Subsystem HEADers?SYSTem Subsystem Summary ERRorSyntax AttributeSummary HELPHEADers?Syntax AttributeTable 4-19. Instrument Conditions 1 of PRESetSYSTem Subsystem SYSTem Subsystem Table 4-19. Instrument Conditions 2 ofVERSion Table 4-20. SCPI Version NumbersSYSTem Subsystem TRIGger Subsystem TRIGger SubsystemSummary ABORtSyntax AttributeAttribute INITiateCONTinuousNon-sequential command SyntaxAttribute INITiateIMMediateNon-sequential command SyntaxPOWer UNIT SubsystemUNIT Subsystem Programming Commands UNIT Subsystem4-108 Sensitivity 5 Performance TestsTest 1. Absolute Wavelength Accuracy TestTest Performance TestsCalibration Cycle Test 1. Absolute Wavelength Accuracy 5Test 1. Absolute Wavelength Accuracy be damaged when total input power exceeds 18 dBmbe damaged when total input power exceeds 18 dBm Test 2. Sensitivitybe damaged when total input power exceeds 18 dBm Test 3. Polarization DependenceTest 4. Optical Input Return Loss Procedure Standard instruments flat contacting connectorsand Regulatory Information” Procedure Option 022 instruments angled contacting connectorsTest 4. Optical Input Return Loss FC/APC patchcord lossTest 5. Amplitude Accuracy and Linearity Polarization sensitivityProcedure completely filled in Test 5. Amplitude Accuracy and Linearity Table 5-21. Linearity Data ValuesDesired Power Power MeterPage Specifications and Regulatory Information Laser Safety Information 6Product Overview Specifications and Regulatory Information Specifications and Regulatory InformationCalibration Cycle present the wavelength difference between two signals that are simultaneouslyDefinition of Terms during manufacturing at 1523.488 nm, or 196.7804 THzpanel connector, and assumes the user’s connector is good the polarization of the input signal is variedpower laser lines present to accurately measure wavelength and power10 GHz 0.08 nm at 1550 nm, 0.06 nm at 1300 nm Specifications-NORMAL Update ModeWavelength Specifications-NORMAL Update ModeSpecifications-NORMAL Update Mode AmplitudeSensitivity SelectivitySpecifications-NORMAL Update Mode Input Return LossMeasurement Cycle Time Measurement ApplicationsWavelength Specifications-FAST Update ModeFAST update mode unless noted. Refer to “Measurement rate” on page 2 Specifications-FAST Update ModeSelectivity Specifications-FAST Update ModeAmplitude SensitivityMeasurement Applications Specifications-FAST Update ModeInput Return Loss Measurement Cycle TimeOperating Specifications Operating SpecificationsOperating Specifications Please pay attention to the following laser safety warnings Laser Safety InformationNotice for Germany Noise Declaration Compliance with Canadian EMC RequirementsThis ISM device complies with Canadian ICES-001 Cet appareil ISM est conforme à la norme NMB-001 du CanadaDeclaration of Conformity Declaration of ConformityProduct Overview Front view of instrument Rear view of instrumentProduct Overview Specifications and Regulatory Information Product Overview6-16 Reference Instrument Preset ConditionsError Messages Agilent Technologies Service OfficesSettings after Power Instrument Preset ConditionsTable 5-22. Instrument Preset Conditions 1 of Settings after PresetSettings after Preset Table 5-22. Instrument Preset Conditions 2 ofSettings after Power Instrument Preset ConditionsMenu Maps Menu MapsMenu Maps Appl’s MenuThere is no menu associated with this key Display List by Power MenuDisplay Avg WL Menu Measurement Cont MenuMenu Maps Display List by WL Menu Delta On MenuMenu Maps Delta Off Menu Display Peak WL and System Preset MenusMeasurement Single Menu There is no menu associated with this keyMenu Maps System Print MenuMenu Maps System Setup MenuTable 5-23. Instrument Specific Error Messages 1 of Error MessagesError Message Table 5-23. Instrument Specific Error Messages 2 ofError Messages Error NumberError Message Table 5-23. Instrument Specific Error Messages 3 ofError Messages Error NumberDescription Table 5-24. General SCPI Error Messages 1 ofError Messages Error NumberDescription Table 5-24. General SCPI Error Messages 2 ofError Messages Error NumberDescription Table 5-24. General SCPI Error Messages 3 ofError Messages Error NumberDescription Front-Panel Fiber-Optic AdaptersFront-Panel Fiber-Optic Adapters Front PanelPlug Type Power CordsAgilent Technologies Service Offices Power CordsAgilent Technologies Service Offices Agilent Technologies Service NumbersPage Index NumericsIndex Index-3 IndexIndex-4 IndexIndex-5 IndexIndex-6 IndexIndex-7 IndexPage Page Agilent Technologies  Agilent Technologies GmbH Printed in Germany AugustSecond edition, August 86120-90C03