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Agilent Technologies E4406A What are Baseband I/Q Signals?, Why Make Measurements at Baseband?

Models: E4406A

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Troubleshooting Install Adjust the IF Align Signal Show Errors Warranty Configuring I/O If You Have a Problem MEASURESetup Key Access Locations Setup Keys

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Agilent Technologies E4406A manual What are Baseband I/Q Signals?, Why Make Measurements at Baseband?

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Contents

User’s Guide Agilent Technologies E4406A VSA SeriesTransmitter Tester Safety Information Warranty LIMITATION OF WARRANTYEXCLUSIVE REMEDIES Page Contents Using System FeaturesGetting Started Contents 3.Setting the Mode4. Making Measurements Changing the Measurement Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133 Changing the Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135 Using the Marker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135 Troubleshooting Hints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135 Making the Power Stat CCDF Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136 Purpose . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136 Measurement Method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136 Making the Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137 Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137 Changing the Measurement Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138 Changing the View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139 Changing the Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139 Using the Markers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140 Troubleshooting Hints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140 Service Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141 Timebase Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142 Purpose . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142 Measurement Method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142 Test Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142 Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143 50 MHz Amplitude . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 144 Purpose . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 144 Measurement Method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 144 Test Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 144 Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145 Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146 Purpose . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146 Measurement Method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146 Test Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146 Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146 Front Panel Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 148 Purpose . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 148 Test Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 148 Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149 Troubleshooting Hints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149 Service Power vs. Time Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150 Purpose . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150 Using Baseband I/Q Inputs Option B7C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 151 What are Baseband I/Q Inputs? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 152 What are Baseband I/Q Signals? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 153 Why Make Measurements at Baseband?. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 153 Making Measurements with Baseband I/Q Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 154 Baseband I/Q Measurement Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155 Selecting Input Probes for Baseband Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 156 Selecting Baseband I/Q Inputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 159 Selecting Baseband I/Q Input Connectors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 159 Setting Up Baseband I/Q Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 161 Baseband I/Q Measurement Views . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 165 Baseband I/Q Measurement Result Examples Contents Contents 5. If You Have a Problem6. Options and Accessories List of Keys Front Panel Test List of Keys Reference List of Keys List of Keys Getting Started Topics include Table Standard DocumentationPart Description Personality Documentation TableMeasurement Option Part Description Understanding Digital Communications Measurements URL for the Latest VSA Transmitter Tester UpdateDescription Agilent Part Updating the Firmware Getting StartedChapter Setup Keys Making a MeasurementStep Primary Key System Front Panel Keys Context Dependency Spectrum Freq Domain Spurious Close Channel Power Service GSM cdmaOne Waveform Time DomainMeas View/Setup Trace MEASURESetup Setup Channel PowerMarker Getting Started Spectrum Freq Domain Spurious Close Channel Power Service GSM cdmaOne Waveform Time DomainMeas View/Setup Trace MEASURESetup 2.Control keys Front Panel Description Chapter Getting Started Front Panel Description 6.Mode keys select the measurement mode and mode parameters See page 83 for more detail Chapter Getting Started Front Panel Description 12.Floppy Disk Drive. The floppy disk drive accepts 1.44 megabyte disks. For an explanation of the operation of the floppy disc drive see the Using Print Keys section on page be implemented with a future firmware update Rear Panel Description Getting Started Rear Panel DescriptionChapter measurements. The external trigger accepts an 11. PARALLEL The PARALLEL connection supports remote printing Display Annotation Measurement Bar. Displays information about ESec even second clock - The green ESec Available Personality Options Installing Optional Measurement Personalities Required Information Loading the Optional PersonalityKey Path Available Personality Options Viewing a License Key Using the Uninstall Key Installing a License KeyPage Cables for Connecting to the Serial Port RS-232 Figure 1-5HP 24542U CableFigure 1-6HP F1047-80002Cable Figure 1-7HP 24542G/H Cable Cables for Connecting to the Serial Port RS-232Figure HP 92219J Cable Figure 1-10HP 24542M Modem Cable Cables for Connecting to the Serial Port RS-232Figure 1-11HP C2913A/C2914A Cable Figure 1-12Mouse Adapter typical Figure 1-13HP 24542U Cable with 5181-6641Adapter Cables for Connecting to the Serial Port RS-232Figure 1-14HP 24542U Cable with 5181-6640Adapter Figure 1-15HP 24542U Cable with 5181-6642Adapter Figure 1-16HP 24542U Cable with 5181-6639Adapter Figure 1-19HP F1047-80002Cable with 5181-6642Adapter Instrument Installation Safety Considerations Instrument Operation and Maintenance Safety Considerations for Service Personnel Chapter Getting Started Safety Considerations Using System Features Install and Uninstall Using System Keys Key Locations Key Access LocationsTable Using System Features Key LocationsChapter Table Key Access LocationsUsing System Features Key Access Path Using System Features Key Locations Key Access LocationsKey Access Path Table Using System Features Key Locations Key Access LocationsKey Access Path Table Using System Features Key Access LocationsKey Access Path Table Using System Features Key Access LocationsKey Access Path Key Locations Key Locations Using System FeaturesInput/Input Port Chapter Chapter Using System Features Key Locations Using System Features Key Access LocationsKey Access Path Key Locations Printing a Displayed Screen Using Print and Print Setup Functions when Color Print is set to language default toFront Panel Key Level Using System Features Using Print and Print Setup FunctionsChapter the six screen files selectedshown below are available only when Using File and Save Keys Loading a StateSaving a State Level Using the Alpha Editor KeysLevel Level Configuring I/O Using Input/Output Configuration Keys •SCPI LAN - Accesses the following keys Reference File SystemFront Panel Level •10 MHz Out - Activates, or deactivates, the 10 MHz out signal on the rear panel of the instrument. The 10 MHz out can be used to lock other test equipment to the same frequency reference that is used by the transmitter tester. Once activated, the 10 MHz out feature is persistent, so if it is set to On it will remain on, even if the instrument has been preset, or powered off and then on Using System Configuration and Alignment Keys Restore System DefaultsShow Errors Show System features are described in the service guide Using System Configuration and Alignment Keys Using System FeaturesShow System Displays Chapter Using System Features System LocalUsing System Configuration and Alignment Keys Chapter Front AlignmentLevel Level remains constant Using System Features Using System Configuration and Alignment KeysChapter Using System Features Using System Configuration and Alignment KeysChapter Setting the Mode Selecting a Mode Setting the Mode Selecting a ModeChapter Input Keys Mode Setup Adjust the IF Align Signal Adjust Input Attenuation and Input Power •RF Burst Wideband •Video IF Envlp Trigger Keys •Sync Source key menu Selecting the Frequency/Channel 4 Making Measurements Basic Measurements Initial Setup Using Measure KeysPreparing for Measurements Measurement Setup Measurement ControlAveraging Voltage Avg - The voltage is averaged Trigger Source •Typical Measurement Windows Changing the View•Trace Display Span / X Scale Keys •Amplitude / Y Scale Keys Using Markers TraceMarkers Search Marker Marker Functions Purpose Making the Spectrum Frequency Domain MeasurementMeasurement Method Making the Measurement Results Spectrum Frequency Domain Measurement Defaults Changing the Measurement SetupTable Making Measurements measurement data Auto Auto Peak - Select this to set the ADC range automatically to the peak signal level. Auto peak is a compromise that works well for both CW and burst signals Making Measurements Changing the ViewMaking the Spectrum Frequency Domain Measurement Chapter Figure 4-4Spectrum Measurement - I/Q Polar View Changing the Linear Spectrum Display Changing the Display Changing the I or Q Waveform Window Selecting Displayed Traces Within Windows Changing the I/Q Polar WindowMaking Measurements Making the Spectrum Frequency Domain Measurement Measuring Band Power Using the Markers Making Measurements Troubleshooting HintsMaking the Spectrum Frequency Domain Measurement Chapter Purpose Making the Waveform Time Domain MeasurementMeasurement Method Making the Measurement Results Input signal: cdma2000 Rev 8, SR1, 9 Channel Making Measurements Making the Waveform Time Domain MeasurementChapter Changing the Measurement Setup Waveform Time Domain Measurement DefaultsTable In addition, the following parameters can be modified Making Measurements Making the Waveform Time Domain MeasurementChapter Changing the View Meas Setup: View/Trace = I/Q Waveform View Figure 4-9Waveform Measurement - I/Q Polar View Changing the Display Making Measurements Making the Waveform Time Domain MeasurementChapter •Off - Allows you to turn off the selected marker Using the Markers differing values for the maximum point Troubleshooting Hints Making the Adjacent Channel Power ACP Measurement Making the Adjacent Channel Power ACP MeasurementPurpose Measurement Method Making the Measurement ACP Setup RecommendationResults Table Adjacent Channel Power Measurement Defaults Changing the Measurement SetupMaking the Adjacent Channel Power ACP Measurement Figure 4-10ACP Measurement - Bar Graph View Making Measurements Making the Adjacent Channel Power ACP MeasurementMaximum Chapter Offset A 750.000 kHz Offset B 1.98000 MHz Chapter •Limit Test - Turns off the limit test function Changing the View Figure 4-11ACP Measurement - Spectrum View Making the Adjacent Channel Power ACP MeasurementMaking Measurements Chapter This adjacent channel power ratio measurement can reveal degraded or defective parts in the transmitter section of the UUT. The following examples are those areas to be checked further Troubleshooting Hints Making the Channel Power Measurement Making the Channel Power MeasurementPurpose Measurement Method Making the Measurement Channel Power MeasurementResults Figure Changing the Measurement Setup Channel Power Measurement DefaultsTable Page Using the Marker Troubleshooting HintsChanging the Display Making the Power Stat CCDF Measurement PurposeMeasurement Method Making the Measurement Power Statistics CCDF MeasurementResults Figure Changing the Measurement Setup Power Statistics CCDF Measurement DefaultsTable Changing the View Making the Power Stat CCDF MeasurementChanging the Display Making Measurements Using the Markers Troubleshooting Hints•Off - Allows you to turn off the selected marker Front Panel Test on page Pwr vs Time on page Service Measurements Timebase Frequency Test SetupPurpose Measurement Method Results Window Three Freq ErrorWindow One Time Record Window Two Magnitude Test Setup 50 MHz AmplitudePurpose Measurement Method Results Window Three ErrorWindow One RF Magnitude Window Two Cal Magnitude Test Setup SensorsPurpose Measurement Method Chapter Making Measurements Sensors Front Panel Test Test SetupPurpose Results Troubleshooting HintsMaking Measurements Front Panel Test Chapter Service Power vs. Time Measurement Service Power vs. Time MeasurementPurpose Making Measurements Using Baseband I/Q Inputs Option B7C What are Baseband I/Q Inputs? Why Make Measurements at Baseband? What are Baseband I/Q Signals? Making Measurements with Baseband I/Q Inputs Using Baseband I/Q Inputs Option B7C Baseband I/Q Measurement OverviewMaking Measurements Chapter Selecting Input Probes for Baseband Measurements Using Baseband I/Q Inputs Option B7C Making MeasurementsChapter Agilent Probes - Balanced and Unbalanced Table Selecting Baseband I/Q Inputs Selecting Baseband I/Q Input Connectors •IF Align - Select to view the IF alignment signal. This signal is available as a diagnostic function, to check the operation of the alignment signal in the case of alignment failure. Once selected, a menu accessing the IF alignment signal parameters is available at the bottom of the Input menu. Either CW, comb, or pulse signals may be selected. Because the alignment signal is input at the IF frequency, it is displayed on any active Spectrum Freq Domain window, regardless of center frequency Setting Up Baseband I/Q Inputs I/Q Range Settings by Displayed Unit of MeasureTable I and Q Offset Increment vs. I/Q Range TableI and Q I/Q Range Using Baseband I/Q Inputs Option B7C Making MeasurementsChapter Selecting Baseband I/Q Input Impedance Spectrum Views and 0 Hz Center Frequency Baseband I/Q Measurement Views Waveform Views for Baseband I/Q Inputs Table Comparing RF and Baseband I/Q Measurement ViewsRF vs. Baseband I/Q Input Measurement Views, by Measurement Channel Power Measurement Baseband I/Q Measurement Result Examples Spectrum Frequency Domain Measurement Using Baseband I/Q Inputs Option B7CMaking Measurements Chapter Figure 4-19Basic Mode Spectrum Linear View- Baseband I/Q Inputs Waveform Time Domain Measurement Baseband I/Q Key Access Locations Baseband I/Q Key Access LocationsTable Using Baseband I/Q Inputs Option B7C Baseband I/Q Key Access LocationsTable Making Measurements CALCulate Subsystem BbIQ Programming CommandsBaseband I/Q - Spectrum I/Q Marker Query Baseband I/Q - Waveform I/Q Marker Query DISPlay Subsystem Spectrum - Y-AxisScale/Div Baseband I/Q - IQ Offset CalibrationSets the amplitude reference level for the y-axis Spectrum - Y-AxisReference Level Baseband I/Q - Select Input Impedance INPut SubsystemBaseband I/Q - Select Input Impedance Reference Baseband I/Q - Activate IQ Alignment MEASure Subsystem SENSe Subsystem Select the Input Signal Baseband I/Q - Select I/Q Power RangeBaseband I/Q - Select I/Q Voltage Range Instrument Messages and Functional Tests document 5 If You Have a Problem Key or Feature Does Not Appear in Menu Problem Symptoms and Solutions Instrument Fails Alignment - Error Message LAN External Loopback Test Failed - Error MessageIf You Have a Problem Problem Symptoms and Solutions Instrument Power-OnProblem LAN Communication ProblemInstrument Keyboard is Locked Support, Services, and Assistance Agilent Technologies Test and MeasurementChapter Returning Your Instrument to Agilent Technologies Table 5-1Contacting AgilentAsia Call Center Numbers Options and Accessories Option BAH: GSM Measurement Personality Options and Measurement PersonalitiesOption BAC: cdmaOne Measurement Personality Option BAE: NADC/PDC Measurement Personalities Option HN1: iDEN Measurement Personality Option BAF W-CDMAMeasurement PersonalityOption B78: cdma2000 Measurement Personality Option 202: EDGE with GSM Measurement Personality Option B7C: Baseband IQ Measurement Personality Option 0B1: Additional Copy of Manuals Option 300: 321.4 MHz IF Output Option 0BW: Assembly-levelService Documentation Option 0BV: Component-levelService DocumentationOption 1CM Rack Mount Kit Option 1CN Handles Kit Broadband Preamplifiers and Power Amplifiers AccessoriesAC Probe GPIB Cable RS-232Cables N2714A Calibration and Adjustment SoftwareModel Number Description Index IndexNumerics Index Index Index Indexoff, 140 select, 140 shape, 140 trace, Index stateIndex Index Index

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