Agilent Technologies 33120A Instrukcja Użytkownika Strona 1

Service GuidePublication Number 33120-90017 (order as 33120-90104 manual set) Edition 6, March 2002© Copyright Agilent Technologies, Inc. 1994-2002For

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The main CPU, U102, communicates with the earth referenced logicthrough an optically isolated asynchronous serial data link. U101 isolatesthe incoming

The ac mains are connected by a fused power entry module, P1.This module incorporates the functions of mains connection, on/offswitching, fusing, and

Display and KeyboardBlock 11 on block diagram page 129; Schematic on page 141.The front panel circuits consist of vacuum fluorescent display control,d

6Service 6

ServiceThis chapter discusses the procedures involved for returning a failedfunction generator to Agilent for service or repair. Subjects coveredinclu

Operating ChecklistBefore returning your function generator to Agilent for service or repair,check the following items:Is the function generator inope

Types of Service AvailableIf your function generator fails during the warranty period (within threeyears of original purchase), Agilent will replace o

Repackaging for ShipmentIf the unit is to be shipped to Agilent for service or repair, be sure to: Attach a tag to the unit identifying the owner and

Electrostatic Discharge (ESD) Precautions Almost all electrical components can be damaged by electrostaticdischarge (ESD) during handling. Component d

To Replace the Power-Line FuseThe power-line fuse is located within the function generator’s fuse-holderassembly on the rear panel (see page 22). The

ContentsContentsChapter 1 SpecificationsChapter 2 Quick Start To prepare the function generator for use 21If the function generator does not turn o

Troubleshooting Hints This section provides a brief checklist of common failures. Before trouble-shooting or repairing the function generator, make su

Power Supply Problems WARNINGSHOCK HAZARD. Only service-trained personnel who are awareof the hazards involved should remove the instrument covers. Th

Self-Test ProceduresPower-On Self-TestEach time the function generator is powered on, a small set of self-testsare performed. These tests check that t

605 Serial configuration readback failed This test re-sends the last 3byte serial configuration data to all the serial path (SERDAT, SERBCK,SERCLK).

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7Replaceable Parts 7

Replaceable PartsThis chapter contains information to help you order replacement parts foryour 33120A Function Generator. The parts lists are divided

33120-66521 – Main PC AssemblyReference Agilent Part Mfr. Mfr. PartDesignator Number Qty Part Description Code NumberC101

Reference Agilent Part Mfr. Mfr. PartDesignator Number Qty Part Description Code NumberC535-C536 0160-5952 2 CAP-FXD 330 p

Reference Agilent Part Mfr. Mfr. PartDesignator Number Qty Part Description Code NumberC1017-1019 0160-5947 CAP-FXD 1000 p

Chapter 4 Calibration Procedures (continued)Calibration Security Code 64Calibration Count 66Calibration Message 66General Calibration/Adjustment

Reference Agilent Part Mfr. Mfr. PartDesignator Number Qty Part Description Code NumberJM1001-1004 0699-1503 7 RESISTOR .0

Reference Agilent Part Mfr. Mfr. PartDesignator Number Qty Part Description Code NumberR301 0699-1403 1 RESISTOR 31.6K

Reference Agilent Part Mfr. Mfr. PartDesignator Number Qty Part Description Code NumberR629 0699-2712 RESISTOR 255 +-1% .1

Reference Agilent Part Mfr. Mfr. PartDesignator Number Qty Part Description Code NumberR724 0699-1437 4 RESISTOR 825 +-1%

Reference Agilent Part Mfr. Mfr. PartDesignator Number Qty Part Description Code NumberR908 0699-1318 RESISTOR 1K +-1% .1

Reference Agilent Part Mfr. Mfr. PartDesignator Number Qty Part Description Code NumberU301-U302 1821-0964 2 IC DRVR 8X S

33120-66502 – Display and Keyboard PC Assembly Reference Agilent Part Mfr. Mfr. PartDesignator Number Qty Part Description C

33120A Mainframe Reference Agilent Part Mfr. Mfr. PartDesignator Number Qty Part Description Code NumberA1 33120-66521 1 M

Manufacturer’s List Mfr Code Manufacturer’s Name Manufacturer’s Address Zip Code00779 Amp Inc Harrisburg, PA, U.S.A. 1711101295 Texas Instru

8Schematics 8

ContentsChapter 6 ServiceOperating Checklist 103Types of Service Available 104Repackaging for Shipment 105Cleaning 105Electrostatic Discharge (ESD

Schematics 33120A Block Diagram . . . . . . . . . . . . . . . . . 129 Mechanical Disasembly . . . . . . . . . . . . .

Block Diagram129Fold HereFold HereFold HereFold HereÔ Binder Edge (RH Page) Foldout Cut Size = 9 x 19 inchesÔ Binder Edge (RH Page) Foldout

Mechanical Disassembly130Pull Off HandlePull Off BumpersLoosenCaptiveScrewsRemove Bottom ScrewSlide Off Outer CasePull ToRemovePress Down ToUnlatch Ca

33120-66521 (sheet 1 of 10)Floating Logic Schematic131Fold HereFold HereFold HereFold HereÔ Binder Edge (RH Page) Foldout Cut Size = 9 x 19 inche

33120-66521 (sheet 2 of 10)Digital Waveform Data Synthesis Schematic132Fold HereFold HereBinder Edge (LH Page) Foldout Cut Size = 9 x 19 inchesFold H

33120-66521 (sheet 3 of 10)System DAC Schematic133Fold HereFold HereFold HereFold HereÔ Binder Edge (RH Page) Foldout Cut Size = 9 x 19 inchesÔ

33120-66521 (sheet 4 of 10)Waveform DAC Schematic134Fold HereFold HereBinder Edge (LH Page) Foldout Cut Size = 9 x 19 inchesFold HereFold HereBinder

33120-66521 (sheet 5 of 10)Filters Schematic135Fold HereFold HereFold HereFold HereÔ Binder Edge (RH Page) Foldout Cut Size = 9 x 19 inchesÔ Bin

33120-66521 (sheet 6 of 10)Sync, Square Wave, and Attenuator Schematic136Fold HereFold HereBinder Edge (LH Page) Foldout Cut Size = 9 x 19 inchesFold

33120-66521 (sheet 7 of 10)Output Amplifier Schematic137Fold HereFold HereFold HereFold HereÔ Binder Edge (RH Page) Foldout Cut Size = 9 x 19 inc

Contents12

33120-66521 (sheet 8 of 10)Output Attenuator Schematic138Fold HereFold HereBinder Edge (LH Page) Foldout Cut Size = 9 x 19 inchesFold HereFold HereBi

33120-66521 (sheet 9 of 10)Earth Reference Logic Schematic139Fold HereFold HereFold HereFold HereÔ Binder Edge (RH Page) Foldout Cut Size = 9 x 1

33120-66521 (sheet 10 of 10)Power Supplies Schematic140Fold HereFold HereBinder Edge (LH Page) Foldout Cut Size = 9 x 19 inchesFold HereFold HereBind

33120-66502 (sheet 1 of 1) Display and Keyboard Schematic141Fold HereFold HereFold HereFold HereÔ Binder Edge (RH Page) Foldout Cut Size = 9 x 19

33120-66521 Component Locator Diagram142TOP SIDE 33120-66521 REV AFold HereFold HereBinder Edge (LH Page) Foldout Cut Size = 9 x 19 inchesFold Here

TOP SIDE 33120-66502 REV C33120-66502 Component Locator Diagram143

 Copyright Agilent Technologies, Inc.1994-2002No part of this manual may be repro-duced in any form or by any means(including electronic storage and

1Specifications 1

WAVEFORMS Standard Waveforms:Arbitrary Waveforms: Waveform Length: Amplitude Resolution: Sample Rate: Non-Volatile Memory:Sine, Square, Triangle,Ramp,

MODULATION CHARACTERISTICSSYSTEM CHARACTERISTICSAM Modulation Carrier -3 dB Freq: Modulation: Frequency: Depth: Source:FM Modulation Modulation: Fre

GENERAL SPECIFICATIONSPower Supply: (1)Power-Line Frequency:Power Installation:Power Consumption:Operating Environment:Storage Environment:State Stora

PRODUCT DIMENSIONSTOPAll dimensions areshown in millimeters. 1Chapter 1 SpecificationsAgilent 33120A Function Generator17

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2Quick Start 2

Quick StartOne of the first things you will want to do with your function generator isto become acquainted with its front panel. We have written the e

To prepare the function generator for useThe following steps help you verify that the function generator is ready for use.1 Check the list of supplied

If the function generator does not turn onUse the following steps to help solve problems you might experiencewhen turning on the function generator. I

Verify that the correct line voltage is selected and the power-line fuse is good. 1 Remove the power cord. Remove the fuse-holder a

To adjust the carrying handleTo adjust the position, grasp the handle by the sides and pull outward.Then, rotate the handle to the desired position.

To set the output frequencyAt power-on, the function generator outputs a sine wave at 1 kHz withan amplitude of 100 mV peak-to-peak (into a 50W termin

To set the output amplitudeAt power-on, the function generator outputs a sine wave with anamplitude of 100 mV peak-to-peak (into a 50W termination). T

To set a dc offset voltageAt power-on, the function generator outputs a sine wave with a dc offsetvoltage of 0 volts (into a 50W termination). The fol

The Agilent Technologies 33120A is a high-performance 15 MHzsynthesized function generator with built-in arbitrary waveformcapability. Its combination

To set the duty cycle Applies only to square waves. At power-on, the duty cycle for square waves is 50%. You can adjust the duty cycle for a square wa

To output a stored arbitrary waveform There are five built-in arbitrary waveforms stored in non-volatile memoryfor your use. You can output these wave

To output a dc voltageIn addition to generating waveforms, you can also output a dc voltage inthe range  5 Vdc (into a 50W termination). The followin

To store the instrument stateYou can store up to three different instrument states in non-volatilememory. This enables you to recall the entire instru

To verify that the state was stored properly, you can turn the power offbefore recalling the state. Recall 5 Recall the stored instrument state.To re

To rack mount the function generatorYou can mount the function generator in a standard 19-inch rack cabinet using one of three optional kits available

To rack mount a single instrument, order adapter kit 5063-9240. To rack mount two instruments side-by-side, order lock-link kit 5061-9694 and flang

3Front-PanelMenu Operation 3

Front-Panel Menu OperationBy now you should be familiar with some of the basic features of the frontpanel. Chapter 2 shows you how to prepare the func

Front-panel menu reference A: MODulation MENU 1: AM SHAPE Õ 2: AM SOURCE Õ 3: FM SHAPE Õ 4: BURST CNT Õ 5: BURST RATE Õ Õ 6: BURST PHAS

The Front Panel at a Glance 1 Function / Modulation keys2 Menu operation keys3 Waveform modify keys4 Single / Internal Trigger key (Burst and S

D: SYStem MENU 1: OUT TERM Õ 2: POWER ON Õ 3: ERROR Õ 4: TEST Õ 5: COMMA Õ 6:REVISION 1: OUT TERM Selects the output termination (50 or high

A front-panel menu tutorial This section is a step-by-step tutorial which shows you how to use thefront-panel menu. We recommend that you spend a few

Messages Displayed During Menu UseTOP OF MENU You pressed ¾ while on the “MENUS” level; this is the toplevel of the menu and you cannot go any hig

Menu Example 1 The following steps show you how to turn on the menu, move up anddown between levels, move across the choices on each level, and turn o

5 Move down a level to the “PARAMETER” choices.The first parameter choice is “DEFAULT” for the POWER ON command(“DEFAULT” is the factory setting

Menu Example 2 Some commands in the menu require that you enter a numericparameter value. The following steps show you how to enter a number inthe men

To select the output terminationThe function generator has a fixed output impedance of 50 ohms on theOUTPUT terminal. You can specify whether you are

To output a modulated waveform A modulated waveform consists of a carrier and a modulating waveform.In AM (amplitude modulation), the amplitude of the

4 Move down a level verify that “SINE” is selected. For the modulating waveform, you can select a sine, square, triangle,ramp, noise, or arbitrar

To unsecure the function generator for calibrationThe function generator can use a calibration security code to preventunauthorized or accidental cali

Front-Panel Number Entry Increments the flashing digit.Decrements the flashing digit.Moves the flashing digit to the right. Moves the flashing dig

4 Move down to the “parameters” level.^000000:CODE 0 3 3 1 2 0 5 Unsecure the function generator by entering the security

4CalibrationProcedures 4

Calibration ProceduresThis chapter contains procedures for verification of the functiongenerator’s performance and adjustment (calibration). The chapt

Closed-Case Electronic Calibration The function generator featuresclosed-case electronic calibration since no internal mechanicaladjustments are requ

Automating Calibration ProceduresYou can automate the complete verification and adjustment proceduresoutlined in this chapter if you have access to pr

Test ConsiderationsTo ensure proper instrument operation, verify that you have selected thecorrect power line voltage prior to attempting any test pro

Performance Verification TestsThe performance verification tests use the function generator’sspecifications listed in chapter 1, “Specifications,” sta

Quick Performance CheckThe quick performance check is a combination of internal self-test and anabbreviated performance test (specified by the letter

Frequency VerificationThis test verifies the frequency accuracy of the two sources in thefunction generator. All output frequencies are derived from a

DC Function Offset VerificationThis test verifies the DC offset and DC output specifications.Set the function generator for each output indicated in t

The Front-Panel Menu at a Glance The menu is organized in a top-down tree structure with three levels. A: MODulation MENU 1: AM SHAPE 2: AM SO

Agilent 33120A MeasurementFunction OUT TERM 1Ampl Freq Nominal Error Q Sine wave HIGH Z 7.0 Vrms 1.00 kHz 7.0 Vrms 0.070 VrmsSine wave HIGH Z 5.7 Vrm

Install the 50W feedthrough load between the DMM and the functiongenerator output. Set the function generator for each output indicated inthe table on

Amplitude Flatness VerificationThis test verifies the output amplitude flatness specification at selectedfrequencies. If you use a TVC (recommended) o

AM Modulation Depth VerificationThis test verifies the modulation depth specification.Select each function generator output in the table below. Use a

Optional Performance Verification TestsThese tests are not intended to be performed with every calibration. They are provided as an aid for verifyin

Distortion VerificationThis test checks the Harmonic Distortion at selected frequencies andharmonics. This test requires the use of a spectrum analyze

Calibration Security CodeThis feature allows you to enter a security code (electronic key) to preventaccidental or unauthorized calibrations of the fu

To Unsecure the Function Generator Without the Security CodeTo unsecure the function generator without the correct security code,follow the steps belo

Calibration CountThe calibration count feature provides an independent “serialization” ofyour calibrations. You can determine the number of times that

General Calibration/Adjustment ProcedureThe adjustment procedures described in chapter 4 use the CAL MENU togenerate and set internal calibration cons

Display AnnunciatorsAdrs Rmt Trig AMFMExt FSKBurstSwpERROROffsetShiftNumArbFunction generator is addressed to listen or talk over a remote interface.

< > 7 Move the flashing cursor over the digit to be edited. 1 ^ 8 Change the value in the display to match the measured fre

Aborting a Calibration in Progress Sometimes it may be necessary to abort a calibration after the procedurehas already been initiated. You can abort a

Function Gain and Linearity AdjustmentThe function generator stores six calibration constants related to functiongain and linearity. The constants are

Nominal OutputSETUP FREQUENCY AMPLITUDE Adjustment for:8 1 kHz 5.5 V rms 2 dB Output Attenuator9 1 kHz 4.4 V rms 4 dB Output Attenuator10 1 kHz 3.5 V

Modulation Adjustment The function generator stores three calibration constants related toamplitude modulation depth. The constants are calculated fro

AC Amplitude Adjustment (50W)1 The function generator stores 16 calibration constants related to 50Woutput. The constants are calculated from the adju

4 Use the DMM to measure the function generator ACrms output voltagefor each setup in the table on the next page. These adjustments use the50W load an

Nominal OutputSETUP FREQUENCY AMPLITUDE Adjustment for:34 1 kHz 3.5 Vrms 0 dB Output Attenuator35 1 kHz 2.8 Vrms 2 dB Output Attenuator36 1 kHz 2.23 V

DC Output AdjustmentThe function generator stores nine calibration constants related to DC volts output. The constants are calculated from the adjustm

Duty Cycle AdjustmentThe function generator stores two calibration constants related tosquarewave offset and two calibration constants related to squa

The Rear Panel at a Glance1 Chassis ground 2 Power-line fuse-holder assembly 3 Power-line voltage setting 4 AM modulation input terminal 5

This procedure can be performed with one of three types of measurementdevice; a broadband ACrms voltmeter, a power meter, or a thermalvoltage converte

3 For each setup in the table below, use the CALIBRATE command tochange the displayed amplitude to match the measured amplitude.Nominal OutputSETUP FR

Output Amplifier Adjustment (Optional)This adjustment procedure should only be performed following repairs tothe Output Amplifier circuitry. The adjus

Error MessagesThe following tables are abbreviated lists of function generator’s errormessages. They are intended to include errors which are likely t

Calibration Error MessagesError Error Message701 Cal security disabled by jumper702 Cal secured703 Invalid secure code704 Secure co

5Theory ofOperation 5

Theory of OperationThis chapter is organized to provide descriptions of the circuitrycontained on the schematics shown in chapter 8. A block diagramov

Block Diagram OverviewThis discussion pertains to the block diagram shown on page 129. The function function generator’s circuitry is divided into tw

Output AttenuatorBlock 8 on block diagram page 129; Schematic on page 138.The Output Attenuator provides 0 to 30 dB of signal attenuation betweenthe o

Output Amplifier Block 7 on block diagram page 129; Schematic on page 137.The output amplifier drives the function generator’s signal outputthrough th

In This Book Specifications Chapter 1 lists the function generator’s specificationsand describes how to interpret these specifications.Quick Start C

The block diagram shows four basic stages: dc amplifier, input differentialamplifier, gain, and power output. The amplifier’s input differentialamplif

AM ModulationBlocks 3 and 6 on block diagram page 129; Schematics on pages 136 and 133.Amplitude modulation is performed by analog multiplier U603 com

Pre-attenuatorBlock 6 on block diagram page 129; Schematic on page 136.All signals, except square waves, pass through the preattenuator. The preattenu

Transistors Q601 and Q602 buffer the output of the sine wave anti-aliasfilter to the input of comparator U620. Square wave duty cycles arecontrolled b

FiltersBlock 5 on block diagram page 129; Schematic on page 135.The output of the Waveform DAC passes through one of two anti-aliasfilters. A 17 MHz 9

Waveform DAC/Amplitude Leveling/Waveform RAMBlock 4 on block diagram page 129; Schematic on page 134.The Waveform DAC, U407, converts 12-bit digital d

The Waveform DAC voltage reference is driven by U410B. This referencecontrols the magnitude of the nominal 0 to -40 mA DAC output current.The referenc

Direct Digital Synthesis (DDS ASIC)Block 2 on block diagram page 129; Schematic on page 132.The DDS ASIC, U206, controls the WA (waveform address) and

System DACsBlock 3 on block diagram page 129; Schematic on page 133.All output amplitudes are derived from the internal voltage reference ofSystem DAC

Floating LogicBlock 1 on block diagram page 129; Schematic on page 131.The floating logic controls the operation of the entire function functiongenera