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Agilent Technologies N9340A manual Identifying Analyzer Distortion O dB atten, Making Measurements

Models: N9340A

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Making Measurements 3

Figure 14 Identifying Analyzer Distortion (O dB atten)

8Press [AMPTD] > {Attenuation} > 10 > {dB} to increase the RF attenuation to 10 dB.

Figure 15 Identifying Analyzer Distortion (10 dB atten)

The marker amplitude readout comes from two sources:

•Increased input attenuation causes poorer signal- to- noise ratio. This causes the marker to be positive.

•The reduced contribution of the analyzer circuits to the harmonic measurement causes the Marker to be negative.

Large marker readout indicates significant measurement errors. Set the input attenuator to minimize the absolute value of marker.

N9340A User’s Guide

Page 49

Image 49

Agilent Technologies N9340A manual Identifying Analyzer Distortion O dB atten, Identifying Analyzer Distortion 10 dB atten

Contents

Agilent N9340A Handheld Spectrum Analyzer User’s GuideNotices WarrantyManual Part Number EditionNotices WarrantyManual Part Number Editionunderstood and met are fully understood and met2 Getting Started Viewing Battery Status3 Making Measurements 1 N9340A OverviewSetting Key Beep 4 System SettingGeneral system settings Show ErrorESC/CLR EnterMarker NormalDefault unit of parameters 6 SCPI Command ReferenceReset Save Trace Save As Recall Trace Limit Limit Line Limit PatternExt Input Select One button measurementTracking Generator Subsystem State8 Menu Map 7 Error MessagesError Message List Trigger Source 139 UNIT SubsystemAgilent N9340A Handheld Spectrum Analyzer N9340A OverviewAgilent Technologies Functionality Introduction1 N9340A Overview N9340A Overview Optimized UsabilityN9340A User’s Guide Caption Front Panel OverviewFunction MEAS, and MODE2. Charging indicator 1. DC Connector3. External power indicator 7. RF OUT Connector For future expansionDescription Display AnnotationsAssociated Function Key SYS Setting GeneralViewing Battery Status Installing a BatteryWorking with Batteries Step1 N9340A Overview Charging a BatteryNever use a modified or damaged AC-DC adapter Conventions Getting StartedAgilent N9340A Handheld Spectrum Analyzer 2 Getting Started Checking Shipment and Order ListN9340A User’s Guide Power RequirementsPlug Type AC Power CordsCable Part Plug acase only Safety ConsiderationsN9340A User’s Guide Do NOT dispose of batteries in a fire 2 Getting StartedEnvironmental Requirements Electrostatic Discharge ESD PrecautionsElectrical Requirements N9340A User’s Guide2 Getting Started Instrument MarkingsPower on your N9340A Powering on the Analyzer for the First TimeN9340A User’s Guide Testing buttons and screen pixel Setting up your N9340A1 Press SYS Setting General to set time and power saving mode Preparation for UseChecking Instrument Information 3 Press SYS More 1 of 3 Show Error to display the error information2 Press SYS More 2 of 3 Option to display the option information N9340A User’s Guide2 Using Arrow Keys 1 Using Knob3 Using Numeric Keypad 4 Using Unit Softkeys2 Press SYS More 1 0f 3 Preset and select Viewing a SignalFigure 1 View a signal 1 GHz, 0 dBm 5 Press FREQ Center Freq 1 GHz to set the center frequency to 1 GHzSaving a User-defined Preset Selecting a preset typeDefault Some helpful tipsAdding an option Upgrading FirmwareN9340A User’s Guide 2 Getting Started Contact Agilent TechnologiesAgilent N9340A Handheld Spectrum Analyzer Making MeasurementsComparing Signals on the Same Screen Measuring Multiple Signals3 Making Measurements Press FREQ Start Freq 40 MHz Press FREQ Stop Freq 110 MHzNext Left PK refer to “Improving Frequency Resolution andAccuracy on page screenFigure 3 Setup for obtaining two signals Resolving Signals of Equal AmplitudePress PRESET Press FREQ Center Freq 300.05 MHz Press SPAN Span 2 MHz Press BW/SWP RBW 30 kHzFigure 4 Resolving signals of equal amplitude Making MeasurementsN9340A User’s Guide Press SPAN 500 kHz Press BW/SWP RBW 300 Hz Resolving Small Signals Hidden by Large SignalsPress MARKER Peak Search Press MARKER Delta Press MARKER Peak Search Next Right PK or Next Left PKFigure 6 A signal closer to the noise level Atten10 dB Measuring a Low-Level SignalReducing Input Attenuation Press FREQ Center Freq 1 GHz Press SPAN 5 MHzFigure 8 A signal closer to the noise level Atten 0 dB Figure 7 A signal closer to the noise level Atten 20 dBPress SPAN 1 MHz Press AMPTD Attenuation 20 dBFigure 9 Decreasing resolution bandwidth Decreasing the Resolution BandwidthMaking Measurements N9340A User’s GuideFigure 10 Using the average detector Using the Average Detector and Increased Sweep Time3 Press BW/SWP Sweep Time to set the sweep time to 500 ms 4 Press BW/SWP Avg Type to change the average typeFigure 11 Trace averaging Trace AveragingMaking Measurements N9340A User’s GuideFigure 12 Using the frequency counter Improving Frequency Resolution and Accuracy3 Making Measurements Identifying Analyzer Generated Distortion Making Distortion MeasurementsPress FREQ Center Freq 400 MHz Press SPAN 700 MHz Figure 13 Harmonic distortionPress AMPTD Attenuation 0 dB Press MARKER Marker To To Ref Press SPAN 50 MHz Press MARKER Peak SearchPress TRACE Trace Press TRACE Clear Write Press TRACE View Press MARKER Peak Search Press Marker DeltaFigure 15 Identifying Analyzer Distortion 10 dB atten Figure 14 Identifying Analyzer Distortion O dB attenMaking Measurements N9340A User’s Guide3 Making Measurements Third-Order Intermodulation DistortionPress MARKER Peak Search Press SPAN 5 MHzPress MARKER Marker To To Ref Press MARKER DeltaPress Marker Normal Press MARKER Peak Search Next Left Right Peak Press MARKER Peak Search Next Left Right PeakFigure 16 TOI test screen 3 Making MeasurementsSetting Percentage % One-button Power MeasurementSetting dBc Measuring OBWKey Access MEAS ACPR Main Channel Key Access MEAS ACPR Center FreqKey Access MEAS ACPR Adj Channel Key Access MEAS ACPR Channel SpaceKey Access MEAS Channel Power Center Freq Measuring Channel PowerKey Access MEAS Channel Power Int BW Integration Bandwidth3 Making Measurements Channel BandwidthN9340A User’s Guide Press Mode Track Generator Amplitude On -10 dBm Figure 17 Transmission Measurement Test SetupMaking a Stimulus Response Transmission Measurement Press FREQ Start Freq 100 MHz Press FREQ Stop Freq 1 GHzPress MEAS Normalize Store Ref 1 → 4 Normalize On Press BW/SWP RBW 30 kHz Press BW/SWP VBW 30 kHzPress MEAS Normalize Norm Ref Posn 8 ENTER Press Marker Normal 370 MHz, Delta 130 MHzMeasuring Stop Band Attenuation of a Low-pass Filter 4 Press BW/SWP RBW 10 kHz to set the resolution bandwidth to 10 kHzPress AMPTD Scale Type Log Press Mode Track Generator Amplitude On -10 dBmPress Delta 37 MHz Press MARKER Normal 370 MHzFigure 19 Minimum Stop Band Attenuation 3 Making MeasurementsMaking a Reflection Calibration Measurement Figure 20 Reflection Measurement Short Calibration Test SetupMaking Measurements N9340A User’s GuidePress FREQ Start Freq 100 MHz 10 dBmPress FREQ Stop Freq 1 GHz Press BW/Avg RBW 1 MHzMaking Measurements Figure 21 Short Circuit NormalizedN9340A User’s Guide Measuring the Return Loss of the Filter Measuring Return Loss Using the Reflection Calibration Routine3 Making Measurements Agilent N9340A Handheld Spectrum Analyzer System SettingAgilent Technologies Quick Display Adjustment Visual and Audio AdjustmentManual Display Adjustment Setting Key BeepGeneral system settings System SettingPower Manager System SettingExt Input Key Access SYS Setting Ext InputExternal Reference Ref External Trigger TrigQuick saving a setup Quick saving or loading a system setupQuick recalling a setup Press SYS Setting Save Setup to save theFile Type FileSaving Path 4 System SettingSaving a file 1 Press SYS File File setup to select the save path and file typeQuick saving a trace or a screen System SettingViewing file list Press SYS File File setup File type to select a file type4 System Setting Press SYS File File setup File type to 2 Press SYS File File setup File type to select a file typeLoading a file decide whether you need to delete the filesShow System Key Access SYS More 2 of 3 Show system4 System Setting Key Access SYS More 2 of 3 Show Error Show ErrorSystem Setting N9340A User’s GuidePerform a Time Base Calibration Key Access SYS More 2 of 3 Calibration4 System Setting Default Setting Factory Default SettingsParameter N9340A User’s GuideN9340A User’s Guide 4 System SettingAgilent N9340A Handheld Spectrum Analyzer Key ReferenceAgilent Technologies Ref level AmplitudeAttenuation 5 Key ReferencePreamp Key access AMPTD Scale TypeScale/DIV Scale TypeRef Offset Key access AMPTD Y Axis UnitsY Axis Units 5 Key ReferenceKey Reference BW/SWPN9340A User’s Guide Avg Type VBW/RBWWhen preset is set to default, or VBW/RBW is set to Auto 5 Key ReferenceLog Pwr Key access BW/SWP Avg TypeVoltage Trace averagingIn non-zero spans Sweep TimeIn zero span 5 Key ReferenceSweep Mode In FFT ModeKey access BW/SWP Sweep Sweep Cont Key access BW/SWP SweepFast Single SweepOn, pressing BW/SWP Single Sweep halts Key access BW/SWP Sweep Sweep ModeKey Reference EnterTerminate filename entries N9340A User’s GuideClear ESC/CLRAssociation with other functions 5 Key ReferenceCenter Frequency FrequencyStart Frequency Stop Frequency5 Key Reference CF StepMarker MarkerNormal Key ReferenceThe delta marker function permits signal-to-noise Deltameasurements provided the signal is a single spectral signal-to-noise/HzPeak Peak SearchNext LF Peak Next RT PeakKey access MARKER Marker To Key access MARKER To CenterMarker To Modepower density Activates a noise readout mode for evaluatingKey access MARKER More 1 of 2 Mode Key access MARKER Marker Trace5 Key Reference MeasN9340A User’s Guide Span SpanFull ZeroKey access TRACE of the selected trace, and updates each trace pointTRACE TraceView Minimum HoldBlank DetectorKey access TRACE More 1 of 2 Detector Average Key access TRACE More 1 of 2 Detector NormalKey access TRACE More 1 of 2 Detector 5 Key ReferenceKey access TRACE More 1 of 2 Detector Neg Peak Key access TRACE More 1 of 2 Detector SampleAverage Pos PeakKey access TRACE More 1 of 2 Save trace Key access TRACE More 1 of 2 AverageKey access TRACE More 1 of 2 Save as Key access TRACE More 1 of 2 Recall traceLimit Line LimitLimit Pattern Set PatternSave Pattern BeepRecall Pattern 5 Key ReferenceAgilent N9340A Handheld Spectrum Analyzer SCPI Command ReferenceAgilent Technologies SCPI Language Basics 6 SCPI Command ReferenceCommon Terms used in this Book Terms DescriptionCommand Syntax Command CategoriesCommand Statement Rules Overview SCPI Command ReferenceKeywords Standard NotationsPunctuation 6 SCPI Command ReferenceSeparator Default unit of parametersSCPI Command Reference N9340A User’s GuideReset Common CommandsClear Status Identification QueryLimit Line Subsection CALCulate SubsystemDelete All Limit Lines in Memory Select the Type of Limit LineControl Limit line Buzzer Control Limit Line TestingSet Limit Line Y-axis value 6 SCPI Command ReferenceSet Limit Pattern X-axis Units Control Limit Pattern TestingSCPI Command Reference N9340A User’s Guide6 SCPI Command Reference Define Limit Pattern ValuesMarkers All Off on All Traces CALCulateMARKer SubsectionMarkers All On Frequency Counter MarkerMarker Peak Maximum Search Marker FunctionMarker Peak Maximum Left Search Marker Peak Maximum Right SearchSet center frequency to the marker value Marker ModeSCPI Command Reference N9340A User’s GuideMarker On/Off Set reference level to the marker valueMarker to Trace 6 SCPI Command ReferenceMarker readout Y Value Marker readout X ValueSCPI Command Reference N9340A User’s GuideAM Demodulation DEMOdulation SubsystemFM Demodulation 6 SCPI Command ReferenceTurn the Entire Display On/Off DISPlay SubsystemTrace Y-Axis Scaling SCPI Command ReferenceTrace Y-Axis Reference Level Offset Trace Y-Axis Reference Level6 SCPI Command Reference This command sets the amplitude level offset for the Y- AxisVertical Axis Scaling Display ModeDISPlayWINDowTRACeYSCALeSPACing LINearLOGarithmic DISPlayWINDowTRACeYSCALeSPACing?Brightness Contrast6 SCPI Command Reference This command adjusts the contrast of the current screen displayContinuous or Single Sweep INITiate SubsystemInitiate a single sweep BW/SWP SweepSelect One button measurement INSTrument Subsystem6 SCPI Command Reference Setting dBc method of OBW Setting Percentage % method of OBWMEASure Subsystem OBW SubsectionLow Adjacent Channel Power Main Channel PowerUpper Adjacent Channel Power Adjacent channelUpper Adjacent Channel Power Ratio Low Adjacent Channel Power RatioMEASureACPRLRATio? MEASureACPRURATio?Channel Power and Power Density Channel Power SubsectionChannel Power Power DensitySENSeAVERage Subsection SENSe SubsystemAverage Type Clear the current AverageSet the Average Count Turn Averaging On/OffSENSeAVERageTRACe 123456STATe? SENSeAVERageTRACe123456COUNt para SENSeAVERageTRACe 123456COUNt?Resolution Bandwidth Automatic Resolution BandwidthSENSeBANDwidth Subsection Video BandwidthVideo to Resolution Bandwidth Ratio Mode Select Video to Resolution Bandwidth RatioVideo Bandwidth Automatic 6 SCPI Command ReferenceAutomatic Detection Type Selected SENSeDETector SubsectionSCPI Command Reference N9340A User’s GuideTypes of Dtection FREQuency SubsectionCenter Frequency Step Size Automatic 6 SCPI Command ReferenceFrequency Span Center Frequency Step SizeFull Frequency Span SCPI Command ReferenceLast Frequency Span Zero Frequency SpanStart Frequency Stop FrequencyInput Port Power Gain SENSePOWer SubsectionInput Attenuation Input Port Attenuator AutoSWEep Subsection Sweep ModeSweep Time Automatic Sweep TimeSYSTem Subsystem Error Information QueryDate Query Time QueryTRACe Subsystem Select Trace Display Mode6 SCPI Command Reference State Tracking Generator SubsystemOutput Amplitude SCPI Command ReferenceAmplitude Offset Amplitude StepTGENeratorAMPLitudeOFFSet ampt 6 SCPI Command ReferenceNormalization Storing as referenceNormalization Reference Level SCPI Command Reference6 SCPI Command Reference Normalization Reference PositionExternal Trigger Slope TRIGer SubsystemTrigger Source SCPI Command ReferenceTRIGerSEQuenceVIDeoLEVel ampl TRIGerSEQuenceVIDeoLEVe? Video Trigger Level Amplitude6 SCPI Command Reference This command specifies the video trigger levelUNIT Subsystem UNITPOWer DBMDBMVDBUVVW UNITPOWer?SCPI Command Reference Selects a power unit for measurementN9340A User’s Guide 6 SCPI Command ReferenceAgilent N9340A Handheld Spectrum Analyzer Error MessagesAgilent Technologies 7 Error Messages Error Message ListN9340A User’s Guide Indicates no matchedFor example, currently in FFT 7 Error MessagesRF Board Changed Meas uncalCannot communicate withN9340A User’s Guide 7 Error MessagesAgilent N9340A Handheld Spectrum Analyzer Menu MapAgilent Technologies AMPTD 8 Menu MapBW/SWP Menu MapN9340A User’s Guide 8 Menu Map FREQFreq Center Freq Start Freq Stop Freq CF Step Auto ManMenu Map MARKERMarker DeltaMode MEAS8 Menu Map MEASenable when SPANMenu Map N9340A User’s Guide8 Menu Map Show ErrorSystem LightMenu Map TRACEN9340A User’s Guide Trace8 Menu Map LimitIndex Page N9340-90001 Agilent Technologies, Inc Printed in China AprilN9340-90001