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Agilent Technologies N9340A manual Using the Average Detector and Increased Sweep Time

Models: N9340A

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3 Making Measurements

Using the Average Detector and

Increased Sweep Time

When the analyzer’s noise masks low- level signals, changing to the average detector and increasing the sweep time smoothes the noise and improves the signal’s visibility. Slower sweeps are required to average more noise variations.

1Refer to “Reducing Input Attenuation" on page 31, and follow steps 1, 2 and 3.

2Press [TRACE] > {More (1 of 2)} > {Detector} > {Average} to select the average detector.

3Press [BW/SWP] > {Sweep Time} to set the sweep time to 500 ms.

Note how the noise smoothes out, as there is more time to average the values for each of the displayed data points.

4Press [BW/SWP] > {Avg Type} to change the average type.

Figure 10 Using the average detector

34	N9340A User’s Guide

Page 44

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Agilent Technologies N9340A manual Using the Average Detector and Increased Sweep Time, Using the average detector

Contents

User’s Guide Agilent N9340A Handheld Spectrum AnalyzerWarranty NoticesManual Part Number EditionWarranty NoticesManual Part Number Editionare fully understood and met understood and metViewing Battery Status 2 Getting Started3 Making Measurements 1 N9340A Overview4 System Setting Setting Key BeepGeneral system settings Show ErrorEnter ESC/CLRMarker Normal6 SCPI Command Reference Default unit of parametersReset Save Trace Save As Recall Trace Limit Limit Line Limit PatternSelect One button measurement Ext InputTracking Generator Subsystem State7 Error Messages 8 Menu MapError Message List Trigger Source 139 UNIT SubsystemAgilent Technologies N9340A OverviewAgilent N9340A Handheld Spectrum Analyzer 1 N9340A Overview IntroductionFunctionality N9340A User’s Guide Optimized UsabilityN9340A Overview Front Panel Overview CaptionFunction MEAS, and MODE1. DC Connector 2. Charging indicator3. External power indicator 7. RF OUT Connector For future expansionDisplay Annotations DescriptionAssociated Function Key SYS Setting GeneralInstalling a Battery Viewing Battery StatusWorking with Batteries StepNever use a modified or damaged AC-DC adapter Charging a Battery1 N9340A Overview Agilent N9340A Handheld Spectrum Analyzer Getting StartedConventions Checking Shipment and Order List 2 Getting StartedPower Requirements N9340A User’s GuideAC Power Cords Plug TypeCable Part Plug aN9340A User’s Guide Safety Considerationscase only 2 Getting Started Do NOT dispose of batteries in a fireElectrostatic Discharge ESD Precautions Environmental RequirementsElectrical Requirements N9340A User’s GuideInstrument Markings 2 Getting StartedN9340A User’s Guide Powering on the Analyzer for the First TimePower on your N9340A Setting up your N9340A Testing buttons and screen pixel1 Press SYS Setting General to set time and power saving mode Preparation for Use3 Press SYS More 1 of 3 Show Error to display the error information Checking Instrument Information2 Press SYS More 2 of 3 Option to display the option information N9340A User’s Guide1 Using Knob 2 Using Arrow Keys3 Using Numeric Keypad 4 Using Unit SoftkeysViewing a Signal 2 Press SYS More 1 0f 3 Preset and selectFigure 1 View a signal 1 GHz, 0 dBm 5 Press FREQ Center Freq 1 GHz to set the center frequency to 1 GHzSelecting a preset type Saving a User-defined PresetDefault Some helpful tipsN9340A User’s Guide Upgrading FirmwareAdding an option Contact Agilent Technologies 2 Getting StartedMaking Measurements Agilent N9340A Handheld Spectrum AnalyzerMeasuring Multiple Signals Comparing Signals on the Same Screen3 Making Measurements Press FREQ Start Freq 40 MHz Press FREQ Stop Freq 110 MHzrefer to “Improving Frequency Resolution and Next Left PKAccuracy on page screenResolving Signals of Equal Amplitude Figure 3 Setup for obtaining two signalsPress PRESET Press FREQ Center Freq 300.05 MHz Press SPAN Span 2 MHz Press BW/SWP RBW 30 kHzN9340A User’s Guide Making MeasurementsFigure 4 Resolving signals of equal amplitude Resolving Small Signals Hidden by Large Signals Press SPAN 500 kHz Press BW/SWP RBW 300 HzPress MARKER Peak Search Press MARKER Delta Press MARKER Peak Search Next Right PK or Next Left PKMeasuring a Low-Level Signal Figure 6 A signal closer to the noise level Atten10 dBReducing Input Attenuation Press FREQ Center Freq 1 GHz Press SPAN 5 MHzFigure 7 A signal closer to the noise level Atten 20 dB Figure 8 A signal closer to the noise level Atten 0 dBPress SPAN 1 MHz Press AMPTD Attenuation 20 dBDecreasing the Resolution Bandwidth Figure 9 Decreasing resolution bandwidthMaking Measurements N9340A User’s GuideUsing the Average Detector and Increased Sweep Time Figure 10 Using the average detector3 Press BW/SWP Sweep Time to set the sweep time to 500 ms 4 Press BW/SWP Avg Type to change the average typeTrace Averaging Figure 11 Trace averagingMaking Measurements N9340A User’s Guide3 Making Measurements Improving Frequency Resolution and AccuracyFigure 12 Using the frequency counter Making Distortion Measurements Identifying Analyzer Generated DistortionPress FREQ Center Freq 400 MHz Press SPAN 700 MHz Figure 13 Harmonic distortionPress SPAN 50 MHz Press MARKER Peak Search Press AMPTD Attenuation 0 dB Press MARKER Marker To To RefPress TRACE Trace Press TRACE Clear Write Press TRACE View Press MARKER Peak Search Press Marker DeltaFigure 14 Identifying Analyzer Distortion O dB atten Figure 15 Identifying Analyzer Distortion 10 dB attenMaking Measurements N9340A User’s GuideThird-Order Intermodulation Distortion 3 Making MeasurementsPress SPAN 5 MHz Press MARKER Peak SearchPress MARKER Marker To To Ref Press MARKER DeltaPress MARKER Peak Search Next Left Right Peak Press Marker Normal Press MARKER Peak Search Next Left Right PeakFigure 16 TOI test screen 3 Making MeasurementsOne-button Power Measurement Setting Percentage %Setting dBc Measuring OBWKey Access MEAS ACPR Center Freq Key Access MEAS ACPR Main ChannelKey Access MEAS ACPR Adj Channel Key Access MEAS ACPR Channel SpaceMeasuring Channel Power Key Access MEAS Channel Power Center FreqKey Access MEAS Channel Power Int BW Integration BandwidthN9340A User’s Guide Channel Bandwidth3 Making Measurements Figure 17 Transmission Measurement Test Setup Press Mode Track Generator Amplitude On -10 dBmMaking a Stimulus Response Transmission Measurement Press FREQ Start Freq 100 MHz Press FREQ Stop Freq 1 GHzPress BW/SWP RBW 30 kHz Press BW/SWP VBW 30 kHz Press MEAS Normalize Store Ref 1 → 4 Normalize OnPress MEAS Normalize Norm Ref Posn 8 ENTER Press Marker Normal 370 MHz, Delta 130 MHz4 Press BW/SWP RBW 10 kHz to set the resolution bandwidth to 10 kHz Measuring Stop Band Attenuation of a Low-pass FilterPress AMPTD Scale Type Log Press Mode Track Generator Amplitude On -10 dBmPress MARKER Normal 370 MHz Press Delta 37 MHzFigure 19 Minimum Stop Band Attenuation 3 Making MeasurementsFigure 20 Reflection Measurement Short Calibration Test Setup Making a Reflection Calibration MeasurementMaking Measurements N9340A User’s Guide10 dBm Press FREQ Start Freq 100 MHzPress FREQ Stop Freq 1 GHz Press BW/Avg RBW 1 MHzN9340A User’s Guide Figure 21 Short Circuit NormalizedMaking Measurements 3 Making Measurements Measuring Return Loss Using the Reflection Calibration RoutineMeasuring the Return Loss of the Filter Agilent Technologies System SettingAgilent N9340A Handheld Spectrum Analyzer Visual and Audio Adjustment Quick Display AdjustmentManual Display Adjustment Setting Key BeepSystem Setting General system settingsPower Manager System SettingKey Access SYS Setting Ext Input Ext InputExternal Reference Ref External Trigger TrigQuick saving or loading a system setup Quick saving a setupQuick recalling a setup Press SYS Setting Save Setup to save theFile File TypeSaving Path 4 System Setting1 Press SYS File File setup to select the save path and file type Saving a fileQuick saving a trace or a screen System Setting4 System Setting Press SYS File File setup File type to select a file typeViewing file list 2 Press SYS File File setup File type to select a file type Press SYS File File setup File type toLoading a file decide whether you need to delete the files4 System Setting Key Access SYS More 2 of 3 Show systemShow System Show Error Key Access SYS More 2 of 3 Show ErrorSystem Setting N9340A User’s Guide4 System Setting Key Access SYS More 2 of 3 CalibrationPerform a Time Base Calibration Factory Default Settings Default SettingParameter N9340A User’s Guide4 System Setting N9340A User’s GuideAgilent Technologies Key ReferenceAgilent N9340A Handheld Spectrum Analyzer Amplitude Ref levelAttenuation 5 Key ReferenceKey access AMPTD Scale Type PreampScale/DIV Scale TypeKey access AMPTD Y Axis Units Ref OffsetY Axis Units 5 Key ReferenceN9340A User’s Guide BW/SWPKey Reference VBW/RBW Avg TypeWhen preset is set to default, or VBW/RBW is set to Auto 5 Key ReferenceKey access BW/SWP Avg Type Log PwrVoltage Trace averagingSweep Time In non-zero spansIn zero span 5 Key ReferenceIn FFT Mode Sweep ModeKey access BW/SWP Sweep Sweep Cont Key access BW/SWP SweepSingle Sweep FastOn, pressing BW/SWP Single Sweep halts Key access BW/SWP Sweep Sweep ModeEnter Key ReferenceTerminate filename entries N9340A User’s GuideESC/CLR ClearAssociation with other functions 5 Key ReferenceFrequency Center FrequencyStart Frequency Stop FrequencyCF Step 5 Key ReferenceMarker MarkerNormal Key ReferenceDelta The delta marker function permits signal-to-noisemeasurements provided the signal is a single spectral signal-to-noise/HzPeak Search PeakNext LF Peak Next RT PeakKey access MARKER To Center Key access MARKER Marker ToMarker To ModeActivates a noise readout mode for evaluating power densityKey access MARKER More 1 of 2 Mode Key access MARKER Marker TraceN9340A User’s Guide Meas5 Key Reference Span SpanFull Zeroof the selected trace, and updates each trace point Key access TRACETRACE TraceMinimum Hold ViewBlank DetectorKey access TRACE More 1 of 2 Detector Normal Key access TRACE More 1 of 2 Detector AverageKey access TRACE More 1 of 2 Detector 5 Key ReferenceKey access TRACE More 1 of 2 Detector Sample Key access TRACE More 1 of 2 Detector Neg PeakAverage Pos PeakKey access TRACE More 1 of 2 Average Key access TRACE More 1 of 2 Save traceKey access TRACE More 1 of 2 Save as Key access TRACE More 1 of 2 Recall traceLimit Limit LineLimit Pattern Set PatternBeep Save PatternRecall Pattern 5 Key ReferenceAgilent Technologies SCPI Command ReferenceAgilent N9340A Handheld Spectrum Analyzer 6 SCPI Command Reference SCPI Language BasicsCommon Terms used in this Book Terms DescriptionCommand Categories Command SyntaxCommand Statement Rules Overview SCPI Command ReferenceStandard Notations KeywordsPunctuation 6 SCPI Command ReferenceDefault unit of parameters SeparatorSCPI Command Reference N9340A User’s GuideCommon Commands ResetClear Status Identification QueryCALCulate Subsystem Limit Line SubsectionDelete All Limit Lines in Memory Select the Type of Limit LineControl Limit Line Testing Control Limit line BuzzerSet Limit Line Y-axis value 6 SCPI Command ReferenceControl Limit Pattern Testing Set Limit Pattern X-axis UnitsSCPI Command Reference N9340A User’s GuideDefine Limit Pattern Values 6 SCPI Command ReferenceCALCulateMARKer Subsection Markers All Off on All TracesMarkers All On Frequency Counter MarkerMarker Function Marker Peak Maximum SearchMarker Peak Maximum Left Search Marker Peak Maximum Right SearchMarker Mode Set center frequency to the marker valueSCPI Command Reference N9340A User’s GuideSet reference level to the marker value Marker On/OffMarker to Trace 6 SCPI Command ReferenceMarker readout X Value Marker readout Y ValueSCPI Command Reference N9340A User’s GuideDEMOdulation Subsystem AM DemodulationFM Demodulation 6 SCPI Command ReferenceDISPlay Subsystem Turn the Entire Display On/OffTrace Y-Axis Scaling SCPI Command ReferenceTrace Y-Axis Reference Level Trace Y-Axis Reference Level Offset6 SCPI Command Reference This command sets the amplitude level offset for the Y- AxisDisplay Mode Vertical Axis ScalingDISPlayWINDowTRACeYSCALeSPACing LINearLOGarithmic DISPlayWINDowTRACeYSCALeSPACing?Contrast Brightness6 SCPI Command Reference This command adjusts the contrast of the current screen displayINITiate Subsystem Continuous or Single SweepInitiate a single sweep BW/SWP Sweep6 SCPI Command Reference INSTrument SubsystemSelect One button measurement Setting Percentage % method of OBW Setting dBc method of OBWMEASure Subsystem OBW SubsectionMain Channel Power Low Adjacent Channel PowerUpper Adjacent Channel Power Adjacent channelLow Adjacent Channel Power Ratio Upper Adjacent Channel Power RatioMEASureACPRLRATio? MEASureACPRURATio?Channel Power Subsection Channel Power and Power DensityChannel Power Power DensitySENSe Subsystem SENSeAVERage SubsectionAverage Type Clear the current AverageTurn Averaging On/Off Set the Average CountSENSeAVERageTRACe 123456STATe? SENSeAVERageTRACe123456COUNt para SENSeAVERageTRACe 123456COUNt?Resolution Bandwidth Resolution Bandwidth AutomaticSENSeBANDwidth Subsection Video BandwidthVideo to Resolution Bandwidth Ratio Video to Resolution Bandwidth Ratio Mode SelectVideo Bandwidth Automatic 6 SCPI Command ReferenceSENSeDETector Subsection Automatic Detection Type SelectedSCPI Command Reference N9340A User’s GuideFREQuency Subsection Types of DtectionCenter Frequency Step Size Automatic 6 SCPI Command ReferenceCenter Frequency Step Size Frequency SpanFull Frequency Span SCPI Command ReferenceZero Frequency Span Last Frequency SpanStart Frequency Stop FrequencySENSePOWer Subsection Input Port Power GainInput Attenuation Input Port Attenuator AutoSweep Mode SWEep SubsectionSweep Time Automatic Sweep TimeError Information Query SYSTem SubsystemDate Query Time Query6 SCPI Command Reference Select Trace Display ModeTRACe Subsystem Tracking Generator Subsystem StateOutput Amplitude SCPI Command ReferenceAmplitude Step Amplitude OffsetTGENeratorAMPLitudeOFFSet ampt 6 SCPI Command ReferenceStoring as reference NormalizationNormalization Reference Level SCPI Command ReferenceNormalization Reference Position 6 SCPI Command ReferenceTRIGer Subsystem External Trigger SlopeTrigger Source SCPI Command ReferenceVideo Trigger Level Amplitude TRIGerSEQuenceVIDeoLEVel ampl TRIGerSEQuenceVIDeoLEVe?6 SCPI Command Reference This command specifies the video trigger levelUNITPOWer DBMDBMVDBUVVW UNITPOWer? UNIT SubsystemSCPI Command Reference Selects a power unit for measurement6 SCPI Command Reference N9340A User’s GuideAgilent Technologies Error MessagesAgilent N9340A Handheld Spectrum Analyzer Error Message List 7 Error MessagesIndicates no matched N9340A User’s Guide7 Error Messages For example, currently in FFTMeas uncal RF Board ChangedCannot communicate with7 Error Messages N9340A User’s GuideAgilent Technologies Menu MapAgilent N9340A Handheld Spectrum Analyzer 8 Menu Map AMPTDN9340A User’s Guide Menu MapBW/SWP FREQ 8 Menu MapFreq Center Freq Start Freq Stop Freq CF Step Auto ManMARKER Menu MapMarker DeltaMEAS Mode8 Menu Map MEASSPAN enable whenMenu Map N9340A User’s GuideShow Error 8 Menu MapSystem LightTRACE Menu MapN9340A User’s Guide TraceLimit 8 Menu MapIndex Page N9340-90001 Agilent Technologies, Inc Printed in China AprilN9340-90001