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Agilent Technologies 33120A manual Contents

Models: 33120A

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Contents

Contents

Chapter 4 Calibration Procedures (continued)

Calibration Security Code 64

Calibration Count 66

Calibration Message 66

General Calibration/Adjustment Procedure 67

Aborting a Calibration in Progress 69

Frequency and Burst Rate Adjustment 69

Function Gain and Linearity Adjustment 70

AC Amplitude Adjustment (High-Z) 70

Modulation Adjustment 72

AC Amplitude Adjustment (50W) 73

DC Output Adjustment 76

Duty Cycle Adjustment 77

AC Amplitude Flatness Adjustment 77

Output Amplifier Adjustment (Optional) 80

Error Messages 81

Chapter 5 Theory of Operation

Block Diagram Overview 85

Output Attenuator 86

Output Amplifier 87

AM Modulation 89

Pre-attenuator 90

Square Wave and Sync 90

Filters 92

Waveform DAC/Amplitude Leveling/Waveform RAM 93

Direct Digital Synthesis (DDS ASIC) 95

System DACs 96

Floating Logic 97

Earth-Referenced Logic 98

Power Supplies 98

Display and Keyboard 100

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Agilent Technologies 33120A manual Contents

Contents

Service Guide Agilent 33120A MHz Function Arbitrary Waveform GeneratorPage Convenient bench-top features Flexible system featuresFront Panel at a Glance Front-Panel Number Entry Front-Panel Menu at a Glance MODulation MenuDisplay Annunciators TrigRear Panel at a Glance Use the front-panel Input / Output Menu toThis Book Page Contents Contents Service SchematicsReplaceable Parts Contents Specifications Waveforms Modulation Characteristics General Specifications Product Dimensions Page Quick Start Quick Start One User’s Guide 〈 This Service Guide Connect the power cord and turn on the function generatorTo prepare the function generator for use Check the list of supplied itemsVerify that there is ac power to the function generator Verify the power-line voltage settingVerify that the power-line fuse is good If the function generator does not turn onRemove the power cord . Remove To adjust the carrying handle To cancel the number mode, press Shift Cancel To set the output frequencyEnter the magnitude of the desired frequency Set the units to the desired valueTo set the output amplitude Enter the magnitude of the desired amplitudeHow to change the offset to -1.5 mVdc Enable the offset modify modeTo set a dc offset voltage Enter the magnitude of the desired offsetTo set the duty cycle Select the square wave functionEnter the desired duty cycle Output the waveform with the displayed duty cycleTo output a stored arbitrary waveform Display the list of arbitrary waveformsMove across to the Exprise choice Select and output the displayed arbitrary waveformTo output a dc voltage Enter the magnitude of the desired voltageSet up the function generator to the desired configuration Turn on the state storage modeTo store the instrument state Save the instrument stateRestore the instrument state Recall the stored instrument stateTo rack mount the function generator Quick Start Front-Panel Menu Operation Front-Panel Menu Operation Front-panel menu reference MODulation MenuFront-panel menu reference SYStem Menu Front-panel menu tutorial Messages Displayed During Menu Use Move across to the Power on command on this level Turn on the menuMove across to the SYS Menu choice on this level Cycle the power to restore the default values Move down a level to the Parameter choicesSave the change and turn off the menu Select amplitude adjustment Increment the first digit until 300.0 mVPP is displayedMove down a level to the OUT Term command To select the output terminationMove down a level and then across to the High Z choice To output a modulated waveform Select AMUse the menu to select the shape of the modulating waveform Move down a level verify that Sine is selected Set the modulating frequency to 200 HzSet the modulation depth to 80% Move down a level to the Secured command To unsecure the function generator for calibrationMove across to the CAL Menu choice on this level Move down to the parameters level Calibration Procedures Calibration Procedures Agilent Calibration Services Calibration IntervalTime Required for Calibration Automating Calibration Procedures Recommended Test EquipmentTest Considerations Performance Verification Tests Self-TestQuick Performance Check Frequency Verification Function Gain and Linearity VerificationDC Function Offset Verification AC Amplitude VerificationAC Amplitude Verification Vrms 0.00035 Vrms Amplitude Flatness Verification 15.00 MHzAM Modulation Depth Verification Vrms 0.0061 VrmsOptional Performance Verification Tests Square Wave Duty Cycle VerificationDistortion Verification Calibration Security Code CharactersTo Unsecure the Function Generator Without the Security Code Calibration Count Calibration MessageGeneral Calibration/Adjustment Procedure Move down a level to the Unsecured commandBegin the Frequency and Burst Rate adjustment procedure Move across to the Calibrate choicePerform the next adjustment procedure Calculate and save the new valueFrequency and Burst Rate Adjustment Aborting a Calibration in ProgressFunction Gain and Linearity Adjustment AC Amplitude Adjustment High-ZAC Amplitude Adjustment High-Z Modulation Adjustment Frequency AmplitudeAC Amplitude Adjustment 50W AC Amplitude Adjustment 50W Adjustment for KHz DC Output Adjustment SetupDuty Cycle Adjustment AC Amplitude Flatness AdjustmentAC Amplitude Flatness Adjustment Exiting Output Amplifier Adjustment Optional Error Messages System Error MessagesSelf-Test Error Messages Calibration Error Messages Theory of Operation Self-test procedures are described in chapter Theory of OperationBlock Diagram Overview This discussion pertains to the block diagram shown onBlock 8 on block diagram page 129 Schematic on Output AttenuatorBlock 7 on block diagram page 129 Schematic on Output Amplifier740 R710 R717 740 R710 R711 R715 R716 R719 R720 AM Modulation Block 6 on block diagram page 129 Schematic on Block 6 on block diagram page 129, schematic onPre-attenuator Square Wave and SyncSquare Wave and Sync Block 5 on block diagram page 129 Schematic on FiltersBlock 4 on block diagram page 129 Schematic on Waveform DAC/Amplitude Leveling/Waveform RAMWaveform DAC/Amplitude Leveling/Waveform RAM Block 2 on block diagram page 129 Schematic on Direct Digital Synthesis DDS AsicBlock 3 on block diagram page 129 Schematic on System DACsBlock 1 on block diagram page 129 Schematic on Floating LogicPower Supplies Block 9 on block diagram page 129 Schematic onBlock 10 on block diagram page 129 Schematic on Earth-Referenced LogicPower Supplies Block 11 on block diagram page 129 Schematic on Display and KeyboardSee Service Service Operating Checklist Is the function generator inoperative?See To prepare the function generator for use on Does the function generator fail self-test?Types of Service Available Call 1-877-447-7278 and ask for Agilent ExpressCleaning Repackaging for ShipmentAgilent suggests that you always insure shipments Electrostatic Discharge ESD Precautions Surface Mount RepairTo Replace the Power-Line Fuse To Replace the Output Protection Fuse F801Troubleshooting Hints Unit Reports ErrorUnit is Inoperative Unit Fails Self-TestPower Supply Problems Self-Test Procedures Power-On Self-Test625 112 Replaceable Parts Replaceable Parts Main PC Assembly 116 117 118 119 120 121 122 123 Display and Keyboard PC Assembly 33120A Mainframe Manufacturer’s List Schematics8 Schematics Block Diagram Pull Off Handle Loosen Captive Sheet 1 132 Sheet 3 Sheet 4 Waveform DAC Schematic 134 Sheet 5 136 Sheet 7 Sheet 8 Output Attenuator Schematic 138 Sheet 9 of 10 Earth Reference Logic Schematic Sheet 10 Power Supplies Schematic 140 Sheet 1 of 1 Display and Keyboard Schematic TOP Side 33120-66521 REV a TOP Side 33120-66502 REV C Manual Part Number