Agilent Technologies 5988-7401EN manual Clock Sources, Measure Function Clock Source

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Combining Parameters for Signal Generation

Using the Agilent 81133A/81134A Pulse Generator

Clock Sources

The selected clock source defines the time base from which all other

timing parameters are derived. You can select between:

•Internal

The clock is derived from the internal YIG oscillator.

•External

•external 10 MHz reference (clock source); clock sources:external 10 MHz reference

Enable the external clock input (Clock In) to accept an external clock signal that forms the time base. The frequency is measured once by selecting the Measure function from the user interface or as a remote SCPI command (:MEASure:FREQuency?).

Measure Function

Clock Source

This value is then used to calculate frequency-dependent values, like the pulse width or the phase (available at the Channel page).

For more information about the Measure function, please refer to the Online Help.

•External 10 MHz Reference

•ext. direct (clock source); clock sources:ext. direct

Enables the external clock input (Clock In) to apply a 10 MHz reference clock. This clock is used as a reference for all timing parameters.

•Int. Direct/Ext. Direct

The direct modes allow changes of frequency without dropouts in the range of 1:2. They are used for applications (precise clock source) where dropouts would make a measurement impossible, for example, PLL frequency sweeps and microprocessor clock sweeps.

Agilent 81133A/81134A Pulse Generator User’s Guide, January 2005

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Contents Agilent 81133A/81134A Pulse Generator Revision Important NoticeContents Setting Up the 81134A by Using the Graphical User Interface Setting Up Generic and Advanced SignalsUpdating the Firmware Troubleshooting Index Contents Environmental Conditions Safety SummarySafety Requirements Before Applying PowerGround the Instrument Do not Operate in an Explosive AtmosphereInitial Inspection Initial InspectionPerformance Requirements Power RequirementsVentilation Requirements Cleaning Recommendation Cleaning RecommendationDeclaration of Conformity Declaration of ConformityIntroduction to the Agilent 81133A/81134A Pulse Generator Introduction to the Agilent 81133A/81134A Pulse Generator Benefits and Key FeaturesFront Panel Overview Front Panel OverviewGraphical User Softkeys Numeric Interface Keys Tab Keys to navigateGlobal Inputs Outputs Channel Inputs Input and OutputsDescription Rear Panel Overview Operating the Agilent 81133A/81134A Pulse Generator Operating the Agilent 81133A/81134A Pulse Generator Navigation through the PagesMain ChannelHow to Navigate through the Parameters at one How to Select a Parameter from a Selection ListPress the navigation knob to open the selection list How to Change a Number Field How to Change a Number FieldPress Modify Values Fine-TuningChanging Single Digits Operating the Agilent 81133A/81134A Pulse Generator Setting Up Generic and Advanced Signals Setting Up Generic and Advanced Signals Setting Up a Clock SignalSetting Up a Clock Signal Using the Graphical User InterfaceNormal Out Channel Set the Freq. Divider to Frequency Divider Indicator Setting Up Generic and Advanced Signals Following code performs the same task Using the Remote Programming InterfacesSetting Up a Pulse Signal Pattern Mode Width Levels Setting Up a Pulse SignalTrigger Mode Generate the Signals //reconnect channels Setting Up a Data Pattern Prbs Polynome Signal Mode Pattern Mode Setting Up a Data PatternECL Levels Switch to the Numeric Edit Mode Pulse Type NRZ Pattern Mode Data ECL LevelsData pattern for channel Numeric Edit Mode Trigger Mode Set up the trigger Set trigger mode to data OUTP0SOUR Bits Delay = 50 ps Period = 500 ps Setting Up a Burst SignalArming Source Width = 100 psInstrument Setting Up a Burst SignalMode Timing Parameter Data pattern for channel Graphic Edit ModeTrigger Output Aux page now looks as follows Following code performs the same tasks Burst Length = 4 x Data Length Setting Up a Repetitive Burst SignalInstrument Burst Repetition Specifies Mode Setting Up a Repetitive Burst SignalData Settings for the Pattern Signal To set the data pattern Setting Up a Repetitive Burst Signal Setting Up Generic and Advanced Signals Prepare the trigger Set trigger mode to Data OUTP0SOUR Bits Setting Up Signals for a Stressed Eye Diagram Measurement Setting Up Signals for a Stressed Eye Diagram Measurement Connecting the Instruments86100 DCA 50 % Setting Up the 81134A by Using Graphical User InterfaceChannel page now looks as follows Enable the trigger output Viewing the Eye Diagram on the 86100 DCA Setting Up the 33250A Waveform GeneratorChannel panel Play with the SettingsUsing the Agilent 81133A/81134A Pulse Generator Pages of the User Interface Using the Agilent 81133A/81134A Pulse GeneratorInstrument Panel Channel Pages of the User Interface Instrument Modes Combining Parameters for Signal GenerationCombining Parameters for Signal Generation Pattern Modes NRZ Signal ModesVariable Crossover Measure Function Clock Source Clock SourcesUsing the Agilent 81133A/81134A Pulse Generator Trigger Out Start ModeTiming of Generated Signals Clock Timing of Generated SignalsDuty Cycle = 50 % Output Trigger OutChannel Freq. Divider = PulsesOutput Trigger Out Data PatternData Pattern of 32 bits Prbs Data Pattern Burst Started BurstRepetitive Burst Jitter Modulation Saving and Recalling SettingsJitter Modulation Saving and Recalling Settings Updating the Firmware Updating the Firmware Troubleshooting Instrument does not Respond TroubleshootingIndex IndexTrigger output levels Index 5988-7401EN

5988-7401EN specifications

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