INPut Subsystem | Agilent Technologies E4406A instruction

Making Measurements

Using Baseband I/Q Inputs (Option B7C)

INPut Subsystem

The INPut subsystem controls the characteristics of all the instrument input ports.

Baseband I/Q - Select Input Impedance

:INPut:IMPedance:IQ U50B600U1MB1M

:INPut:IMPedance:IQ?

Selects the characteristic input impedance when input port is set to I or Q. This is the impedance value as well as the unbalanced (U) or balanced (B) impedance mode.

Baseband I/Q - Select Input Impedance Reference

:INPut:IMPedance:REFerence <integer>

:INPut:IMPedance:REFerence?

Sets the value of the input impedance reference when input port is set to I or Q.

Baseband I/Q - Activate IQ Alignment

:INPut:IQ:ALIGn OFFON01

:INPut:IQ:ALIGn?

Activates or deactivates IQ alignment.

Baseband I/Q - I Input DC Offset

:INPut:OFFSet:I <level>

:INPut:OFFSet:I?

Sets adjustment to compensate for I voltage bias on signals when the I input port is selected.

Baseband I/Q - Q Input DC Offset

:INPut:OFFSet:Q <level>

:INPut:OFFSet:Q?

Sets adjustment to compensate Q voltage bias on signals when the Q input port is selected.

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Chapter 4

Image 176

Agilent Technologies E4406A INPut Subsystem, Baseband I/Q - Select Input Impedance, Baseband I/Q - Activate IQ Alignment

Contents

Transmitter Tester User’s GuideAgilent Technologies E4406A VSA Series Safety Information EXCLUSIVE REMEDIES WarrantyLIMITATION OF WARRANTY Page Getting Started ContentsUsing System Features 4. Making Measurements Contents3.Setting the Mode Contents 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 6. Options and Accessories Contents5. If You Have a Problem List of Keys List of Keys Front Panel Test List of Keys Reference List of Keys Getting Started Topics include Part Description TableStandard Documentation Table Personality DocumentationMeasurement Option Part Description URL for the Latest VSA Transmitter Tester Update Understanding Digital Communications MeasurementsDescription Agilent Part Chapter Updating the FirmwareGetting Started Making a Measurement Setup KeysStep Primary Key Front Panel Keys Context Dependency System Service GSM cdmaOne Waveform Time Domain Spectrum Freq Domain Spurious Close Channel PowerMeas View/Setup Trace MEASURESetup Channel Power SetupMarker Getting Started Service GSM cdmaOne Waveform Time Domain Spectrum Freq Domain Spurious Close Channel PowerMeas View/Setup Trace MEASURESetup Front Panel Description 2.Control keys Getting Started Front Panel Description Chapter 6.Mode keys select the measurement mode and mode parameters See page 83 for more detail Getting Started Front Panel Description Chapter 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 Chapter Rear Panel DescriptionGetting Started Rear Panel Description 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 Installing Optional Measurement Personalities Available Personality Options Loading the Optional Personality Required InformationKey Path Available Personality Options Viewing a License Key Installing a License Key Using the Uninstall KeyPage Figure 1-6HP F1047-80002Cable Cables for Connecting to the Serial Port RS-232Figure 1-5HP 24542U Cable Cables for Connecting to the Serial Port RS-232 Figure 1-7HP 24542G/H CableFigure HP 92219J Cable Cables for Connecting to the Serial Port RS-232 Figure 1-10HP 24542M Modem CableFigure 1-11HP C2913A/C2914A Cable Figure 1-12Mouse Adapter typical Cables for Connecting to the Serial Port RS-232 Figure 1-13HP 24542U Cable with 5181-6641AdapterFigure 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 Safety Considerations Instrument Installation Instrument Operation and Maintenance Safety Considerations for Service Personnel Getting Started Safety Considerations Chapter Using System Features Using System Keys Install and Uninstall Table Key LocationsKey Access Locations Chapter Using System FeaturesKey Locations Key Access Locations TableUsing System Features Key Access Path Key Access Locations Using System Features Key LocationsKey Access Path Table Key Access Locations Using System Features Key LocationsKey Access Path Table Key Access Locations Using System FeaturesKey Access Path Table Key Access Locations Using System FeaturesKey Access Path Key Locations Using System Features Key LocationsInput/Input Port Chapter Using System Features Key Locations Chapter Key Access Locations Using System FeaturesKey Access Path Key Locations Using Print and Print Setup Functions Printing a Displayed Screen language default to when Color Print is set toFront Panel Key Level Chapter Using System FeaturesUsing Print and Print Setup Functions selected the six screen filesshown below are available only when Saving a State Using File and Save KeysLoading a State Using the Alpha Editor Keys LevelLevel Level Using Input/Output Configuration Keys Configuring I/O •SCPI LAN - Accesses the following keys File System ReferenceFront 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 Show Errors Using System Configuration and Alignment KeysRestore System Defaults features are described in the service guide Show System Using System Features Using System Configuration and Alignment KeysShow System Displays Chapter System Local Using System FeaturesUsing System Configuration and Alignment Keys Chapter Alignment FrontLevel Level remains constant Chapter Using System FeaturesUsing System Configuration and Alignment Keys Chapter Using System FeaturesUsing System Configuration and Alignment Keys Setting the Mode Chapter Selecting a ModeSetting the Mode Selecting a Mode Mode Setup Input Keys Adjust Input Attenuation and Input Power Adjust the IF Align Signal Trigger Keys •RF Burst Wideband •Video IF Envlp Selecting the Frequency/Channel •Sync Source key menu 4 Making Measurements Basic Measurements Preparing for Measurements Initial SetupUsing Measure Keys Averaging Measurement SetupMeasurement Control Voltage Avg - The voltage is averaged Trigger Source Changing the View •Typical Measurement Windows•Trace Display Span / X Scale Keys •Amplitude / Y Scale Keys Markers Using MarkersTrace Marker Functions Search Marker Making the Spectrum Frequency Domain Measurement PurposeMeasurement Method Making the Measurement Results Changing the Measurement Setup Spectrum Frequency Domain Measurement DefaultsTable 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 Changing the View Making MeasurementsMaking the Spectrum Frequency Domain Measurement Chapter Figure 4-4Spectrum Measurement - I/Q Polar View Changing the Display Changing the Linear Spectrum Display Changing the I or Q Waveform Window Changing the I/Q Polar Window Selecting Displayed Traces Within WindowsMaking Measurements Making the Spectrum Frequency Domain Measurement Using the Markers Measuring Band Power Troubleshooting Hints Making MeasurementsMaking the Spectrum Frequency Domain Measurement Chapter Making the Waveform Time Domain Measurement PurposeMeasurement Method Making the Measurement Input signal: cdma2000 Rev 8, SR1, 9 Channel Results Chapter Making MeasurementsMaking the Waveform Time Domain Measurement Table Changing the Measurement SetupWaveform Time Domain Measurement Defaults In addition, the following parameters can be modified Chapter Making MeasurementsMaking the Waveform Time Domain Measurement Changing the View Meas Setup: View/Trace = I/Q Waveform View Changing the Display Figure 4-9Waveform Measurement - I/Q Polar View Chapter Making MeasurementsMaking the Waveform Time Domain Measurement Using the Markers •Off - Allows you to turn off the selected marker Troubleshooting Hints differing values for the maximum point Making the Adjacent Channel Power ACP Measurement Making the Adjacent Channel Power ACP MeasurementPurpose Measurement Method ACP Setup Recommendation Making the MeasurementResults Table Changing the Measurement Setup Adjacent Channel Power Measurement DefaultsMaking the Adjacent Channel Power ACP Measurement Figure 4-10ACP Measurement - Bar Graph View Making the Adjacent Channel Power ACP Measurement Making MeasurementsMaximum Chapter Offset A 750.000 kHz Offset B 1.98000 MHz Chapter Changing the View •Limit Test - Turns off the limit test function Making the Adjacent Channel Power ACP Measurement Figure 4-11ACP Measurement - Spectrum ViewMaking Measurements Chapter Troubleshooting Hints 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 Making the Channel Power Measurement Making the Channel Power MeasurementPurpose Measurement Method Channel Power Measurement Making the MeasurementResults Figure Table Changing the Measurement SetupChannel Power Measurement Defaults Page Changing the Display Using the MarkerTroubleshooting Hints Measurement Method Making the Power Stat CCDF MeasurementPurpose Power Statistics CCDF Measurement Making the MeasurementResults Figure Table Changing the Measurement SetupPower Statistics CCDF Measurement Defaults Making the Power Stat CCDF Measurement Changing the ViewChanging the Display Making Measurements •Off - Allows you to turn off the selected marker Using the MarkersTroubleshooting Hints Service Measurements Front Panel Test on page Pwr vs Time on page Test Setup Timebase FrequencyPurpose Measurement Method Window Three Freq Error ResultsWindow One Time Record Window Two Magnitude 50 MHz Amplitude Test SetupPurpose Measurement Method Window Three Error ResultsWindow One RF Magnitude Window Two Cal Magnitude Sensors Test SetupPurpose Measurement Method Making Measurements Sensors Chapter Purpose Front Panel TestTest Setup Troubleshooting Hints ResultsMaking 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? What are Baseband I/Q Signals? Why Make Measurements at Baseband? Making Measurements with Baseband I/Q Inputs Baseband I/Q Measurement Overview Using Baseband I/Q Inputs Option B7CMaking Measurements Chapter Selecting Input Probes for Baseband Measurements Chapter Using Baseband I/Q Inputs Option B7CMaking Measurements Table Agilent Probes - Balanced and Unbalanced Selecting Baseband I/Q Input Connectors Selecting Baseband I/Q Inputs •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 Table Setting Up Baseband I/Q InputsI/Q Range Settings by Displayed Unit of Measure Table I and Q Offset Increment vs. I/Q RangeI and Q I/Q Range Chapter Using Baseband I/Q Inputs Option B7CMaking Measurements Selecting Baseband I/Q Input Impedance Baseband I/Q Measurement Views Spectrum Views and 0 Hz Center Frequency Waveform Views for Baseband I/Q Inputs Comparing RF and Baseband I/Q Measurement Views TableRF vs. Baseband I/Q Input Measurement Views, by Measurement Baseband I/Q Measurement Result Examples Channel Power Measurement Using Baseband I/Q Inputs Option B7C Spectrum Frequency Domain MeasurementMaking Measurements Chapter Figure 4-19Basic Mode Spectrum Linear View- Baseband I/Q Inputs Waveform Time Domain Measurement Table Baseband I/Q Key Access LocationsBaseband I/Q Key Access Locations Baseband I/Q Key Access Locations Using Baseband I/Q Inputs Option B7CTable Making Measurements BbIQ Programming Commands CALCulate SubsystemBaseband I/Q - Spectrum I/Q Marker Query Baseband I/Q - Waveform I/Q Marker Query Baseband I/Q - IQ Offset Calibration DISPlay Subsystem Spectrum - Y-AxisScale/DivSets the amplitude reference level for the y-axis Spectrum - Y-AxisReference Level INPut Subsystem Baseband I/Q - Select Input ImpedanceBaseband I/Q - Select Input Impedance Reference Baseband I/Q - Activate IQ Alignment MEASure Subsystem Baseband I/Q - Select I/Q Voltage Range SENSe Subsystem Select the Input SignalBaseband I/Q - Select I/Q Power Range 5 If You Have a Problem Instrument Messages and Functional Tests document Problem Symptoms and Solutions Key or Feature Does Not Appear in Menu LAN External Loopback Test Failed - Error Message Instrument Fails Alignment - Error MessageIf You Have a Problem Problem Symptoms and Solutions Instrument Keyboard is Locked Instrument Power-OnProblemLAN Communication Problem Chapter Support, Services, and AssistanceAgilent Technologies Test and Measurement Asia Call Center Numbers Returning Your Instrument to Agilent TechnologiesTable 5-1Contacting Agilent Options and Accessories Options and Measurement Personalities Option BAH: GSM Measurement PersonalityOption BAC: cdmaOne Measurement Personality Option BAE: NADC/PDC Measurement Personalities Option B78: cdma2000 Measurement Personality Option HN1: iDEN Measurement PersonalityOption BAF W-CDMAMeasurement Personality Option B7C: Baseband IQ Measurement Personality Option 202: EDGE with GSM Measurement Personality Option 300: 321.4 MHz IF Output Option 0B1: Additional Copy of Manuals Option 0BV: Component-levelService Documentation Option 0BW: Assembly-levelService DocumentationOption 1CM Rack Mount Kit Option 1CN Handles Kit Accessories Broadband Preamplifiers and Power AmplifiersAC Probe GPIB Cable N2714A Calibration and Adjustment Software RS-232CablesModel Number Description Numerics IndexIndex Index Index off, 140 select, 140 shape, 140 trace, IndexIndex Index Indexstate Index Index