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Agilent Technologies 33120A manual AC Amplitude Flatness Adjustment

Models: 33120A

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Chapter 4 Calibration Procedures

AC Amplitude Flatness Adjustment

This procedure can be performed with one of three types of measurement device; a broadband ACrms voltmeter, a power meter, or a thermal voltage converter. The procedure differs slightly depending upon the type of measurement device used. These adjustments us a 50W output termination.

1Use a DMM to measure the ACrms output voltage of the function generator and enter the measurement value for the setup in the table below.

	Nominal Output

SETUP	FREQUENCY	AMPLITUDE	Reference for:
64	1 kHz	3.0 V rms	1 kHz flatness DAC gain

2a. If you are using a broadband ACrms voltmeter, proceed to step 3.

b.If you are using a power meter capable of measurements at 1 kHz,

use the power meter to measure the function generator output and enter the value for the setup in the table below. (If your power meter does not measure to 1 kHz, see the transfer measurement procedure below.)

	Nominal Output
SETUP	FREQUENCY	AMPLITUDE	Reference for:

83	1 kHz	3.0 V rms	V rms, dBm

Transfer Measurement Procedure

If you are using a power meter not capable of measurement to 1 kHz, you can perform the transfer measurement at a different frequency. For example, the Agilent E4418A Power Meter with the Agilent 8482A probe and 20 dB attenuator are specified to a low frequency of 100 kHz. To use this measurement device, perform step 1, then use setup 65 to obtain a 100 kHz output. Measure the output with the power meter and record the measured value. Perform setup 83 and enter the recorded value (not a new measurement). Then, perform step 3 (you will use setup 65 twice). This procedure assumes the output of the function generator is flat from 1 kHz to 100 kHz.

c.If you are using a Thermal Voltage Converter (TVC), use the TVC to measure the function generator output and enter the measurement for the setup in the table below (TVC values entered are in mVdc).

	Nominal Output

SETUP	FREQUENCY	AMPLITUDE	Reference for:
84	1 kHz	3.0 V rms	Thermal Voltage Converter

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Agilent Technologies 33120A manual AC Amplitude Flatness Adjustment

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 Replaceable Parts ServiceSchematics 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 SYS Menu choice on this level Move across to the Power on command on this levelTurn on the menu Save the change and turn off the menu Cycle the power to restore the default valuesMove down a level to the Parameter choices Select amplitude adjustment Increment the first digit until 300.0 mVPP is displayedMove down a level and then across to the High Z choice Move down a level to the OUT Term commandTo select the output termination Use the menu to select the shape of the modulating waveform To output a modulated waveformSelect AM Set the modulation depth to 80% Move down a level verify that Sine is selectedSet the modulating frequency to 200 Hz Move across to the CAL Menu choice on this level Move down a level to the Secured commandTo unsecure the function generator for calibration Move down to the parameters level Calibration Procedures Calibration Procedures Time Required for Calibration Agilent Calibration ServicesCalibration Interval 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 Self-Test Error Messages Error MessagesSystem 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 See Block 11 on block diagram page 129 Schematic onDisplay and Keyboard 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 ExpressAgilent suggests that you always insure shipments CleaningRepackaging for Shipment 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