Agilent Technologies XX3625 User manual

Service Guide

Publication Number 54845-97008

February 2001

This manual applies directly to nfiniium oscilloscopes with serial number prefixes:

•XX3625 through XX4106 and above

for information about serial numbers, see “ nstruments Covered by this Guide” in section 1.

The part number for this Service Guide

For Safety information, Warranties, and Regulatory

information, see the pages at the back of this book.

Copyright Agilent Technologies 1997-2001

Agilent Model 54835A/45A/46A

Oscilloscopes

The Agilent Technologies Infiniium Oscilloscope Model 54835A/45A/46A at a

Glance

Ease of use with high performance

The Agilent Technologies Infiniium oscilloscopes

combine unprecedented ease-of-use with high-

performance digitizing oscilloscope functionality

to simplify your design and analysis measurement

tasks.

• Traditional oscilloscope front-panel interface

provides direct access to the controls needed

for most troubleshooting tasks

• Graphical user interface with menus,

windows, dialogs, and toolbars provides easy

access to dozens of configuration and

analysis tools, ensuring you can set up and

make the most complex measurements

• Agilent 54835A offers 4 channels, 4 GSa/s

sampling rate in 2-channel mode, 2 GSa/s

sampling rate in 4-channel mode, 1 GHz

bandwidth

• Agilent 54845A offers 4 channels, 8 GSa/s

sampling rate in 2-channel mode, 4 GSa/s

sampling rate in 4-channel mode, 1.5 GHz

bandwidth

• Agilent 54846A offers 4 channels, 8 GSa/s

sampling rate in 2-channel mode, 4 GSa/s

sampling rate in 4-channel mode, 2.25 GHz

bandwidth

Display shows waveforms and graphical user

interface

• Graphical interface allows direct interaction

with waveforms, including drag-and-drop

positioning and instant waveform zoom

• Waveforms displayed in color, making

correlation easy

• Current configuration parameters displayed

near the waveform display and are color-

coded to make identification easy

• Graphical interface menus and toolbars

simplify complex measurement setups

Horizontal controls setsweep speed and position

• Main sweep speeds from 100 ps/div to 5 s/div

• Delayed sweep speeds from 1 ps/div to main

time base setting

• Intensified waveforms on main sweep

window make it easy to see what will appear

in delayed sweep window

Acquisition and general controls start and stop

the scope and do basic setup

• Run and stop controls for continuous or

single-shot acquisitions

• Clear display before one or more acquisitions

• Default setup and Autoscale set initial

configuration

Hard disk drive and floppy disk drive for saving

and restoring setups and measurement results

• Store measurement displays for inclusion in

reports and test setup guides

• Store oscilloscope setups to repeat tests

another time

• Hard disk stores oscilloscope operating

system

Trigger setup controls set mode and basic

parameters

• Select Edge, Glitch, or Advanced Modes

• Choose input source and slope

• Set coupling for trigger

• Use graphical user interface to simplify

configuration of pattern, state, delay,

violation, and video triggers

• Use auxiliary trigger to increase triggering

flexibility

Vertical controls set input coupling, impedance,

attenuation, and position

• AC or DC input coupling

•1M

Ωor 50Ωinput impedance

• Input attenuation adjustable from 2 mV/div to

1 V/div (plus 2 V/div in 1 MΩ)

• Color-coded knobs make it easy to find the

controls that affect each waveform

Marker and quick measurements help measure

waveform parameters

• Waveform markers A and B to check voltage

or ∆−time at any point on the displayed

waveform

• Quick Meas executes up to four predefined

measurements instantly

Service Policy

The service policy of this instrument requires

replacing defective assemblies. Some

assemblies can be replaced on an exchange

basis. Items such as the vertical attenuators,

which are subject to wear and tear based on

frequency of use, are a maintenance item that

may need occasional replacement.

iii

Floppy Disk Drive

Power

Acquisition and

general controls

Horizontal

controls

Display and

Graphical

Interface

Marker and Quick

Measurements Vertical

Controls

Vertical

Inputs Auxiliary

Trigger Input

Trigger

Setup

AutoProbe

Interface

n This Book

This book provides the service documentation for the Agilent Technologies 54835A/45A/46A

oscilloscope. t is divided into eight chapters.

Chapter 1 provides general information and specifications.

Chapter 2 shows you how to prepare the oscilloscope for use.

Chapter 3 gives performance tests.

Chapter 4 covers calibration and adjustment procedures, how to do them, and how often they

need to be done.

Chapter 5 provides troubleshooting information.

Chapter 6 gives the procedures and techniques for replacing assemblies and other parts.

Chapter 7 includes a list of exchange assemblies and other replaceable parts, part ordering

information, and shipping information.

Chapter 8 briefly covers the internal operation of the oscilloscope.

At the back of the book you will find Safety information, Warranties, and Regulatory information.

Contents-1

Contents

Contents 1

1 General Information 1-2

nstruments covered by this service guide 1-2

Accessories supplied 1-3

Options available 1-4

Accessories available 1-5

Specifications & characteristics 1-7

Agilent Technologies 54835A/45A/46A general characteristics 1-14

Recommended test equipment 1-16

2 Preparing for Use 2-2

Setting Up the Oscilloscope 2-3

To inspect the instrument 2-3

To connect power 2-4

To connect the mouse or other pointing device 2-5

To attach the optional trackball 2-5

To connect the keyboard 2-7

To connect to the LAN card 2-7

To connect oscilloscope probes 2-8

To connect a printer 2-9

To connect an external monitor 2-10

To connect the GP B cable 2-10

To tilt the oscilloscope upward for easier viewing 2-11

To power on the oscilloscope 2-12

To verify basic oscilloscope operation 2-13

To clean the instrument 2-14

To clean the display monitor contrast filter 2-14

3 Testing Performance 3-2

Testing nterval 3-2

Equipment Required 3-2

Self-Test Verification 3-2

Test Record 3-3

Operating Hints 3-3

Specifications 3-3

Performance Test Procedures 3-3

To test the dc calibrator 3-4

To test input resistance 3-6

To test voltage measurement accuracy 3-7

To test offset accuracy 3-11

To test bandwidth 3-13

To test time measurement accuracy 3-16

To test trigger sensitivity 3-23

4 Calibrating and Adjusting 4-2

Equipment Required 4-2

Self Calibration nterval and Hardware Adjustments 4-2

Contents

Contents–2

Mainframe Cal Factor Memory Error 4-2

Operating Hints 4-3

Loading Default Oscilloscope Settings 4-3

Loading New Software 4-3

Calibration Procedures 4-3

To check the power supply 4-4

To check the 715 Hz auxiliary output (probe compensation squarewave) 4-6

To check the flat panel display (FPD) 4-7

To run the self calibration 4-10

Troubleshooting -2

Safety 5-2

Tools Required 5-2

ESD Precautions 5-2

Keystroke Conventions 5-2

Default Setup 5-3

To install the fan safety shield 5-3

To troubleshoot the instrument 5-4

Primary Trouble solation 5-6

No Display Trouble solation 5-9

Power Supply Trouble solation 5-13

To check probe power outputs 5-16

To check the keyboard 5-17

To check the LEDs 5-19

To check the motherboard, CPU, and RAM 5-21

To check the SVGA display board video signals 5-22

To check the backlight inverter voltages 5-23

POST Code Listing (AM Motherboard only) 5-24

To configure the motherboard jumpers and set up the B OS 5-29

To troubleshoot the acquisition system 5-49

To troubleshoot attenuator failures 5-56

Software Revisions 5-59

6 Replacing Assemblies 6-2

ESD Precautions 6-2

Tools Required 6-2

To return the instrument to Agilent Technologies for service 6-3

To remove and replace the cover 6-4

To disconnect and connect Mylar flex cables 6-5

To remove and replace the AutoProbe assembly 6-6

To remove and replace the probe power and control assembly 6-8

To remove and replace the backlight inverter board 6-9

To remove and replace the front panel assembly 6-9

To remove and replace the keyboard and flat-panel display assemblies 6-12

To remove and replace the acquisition board assembly 6-14

To remove and replace the LAN interface board 6-15

To remove and replace the GP B interface board 6-16

To remove and replace the scope interface board and SVGA display board 6-17

To separate the scope interface board and SVGA display board 6-18

To remove and replace the Option 200 sound card 6-19

To remove and replace the hard disk drive 6-20

Contents

Contents–3

To remove and replace the floppy disk drive 6-21

To remove and replace the motherboard 6-21

To remove and replace the power supply 6-24

To remove and replace the fan 6-25

To remove and replace the CPU 6-26

To remove and replace RAM S MMs or SDRAM D MMs 6-27

To remove and replace an attenuator 6-28

To reset the attenuator contact counter 6-30

To remove and replace an acquisition hybrid 6-32

7 Replaceable Parts 7-2

Ordering Replaceable Parts 7-2

Power Cables and Plug Configurations 7-3

Exploded Views 7-4

Replaceable Parts List 7-15

8 Theory of Operation 8-3

Block-Level Theory 8-3

Attenuator Theory 8-7

Acquisition Theory 8-7

Contents-4

nstruments covered by this service guide 1-2

Accessories supplied 1-3

Options available 1-4

Accessories available 1-5

Specifications & characteristics 1-7

Agilent Technologies 54835A/45A/46A general characteristics 1-14

Recommended test equipment 1-16

General Infor ation

1–2

General Infor ation

This chapter of the Agilent Technologies Infiniium Oscilloscope Service Guide gives

you general information about the instrument. The following topics are covered in this

chapter.

• nstrument identification

• Options

• Accessories

• Specifications and characteristics

• Test equipment requirements

Instru ents covered by this service guide

On the rear panel of the instrument is a serial number label and a V N # label. The serial number

is in the form of XX00000000 while the V N # is in the form of V N # 0XX. The serial number is

composed of two parts: the first two letters and the first four numbers are the serial prefix, while

the last four numbers a re the su ffi x. The p refi x i s norma lly the s ame for all ide ntica l oscil loscop es

and changes only when a change has been made to the oscilloscope. However, the suffix is

sequentially assigned and is different for each oscilloscope. The contents of this manual applies

to oscilloscopes with serial number prefixes listed on the title page.

An oscilloscope manufactured after the printing of this manual may have a newer serial number

prefix. This newer serial prefix indicates that the oscilloscope may be different from those

described in this manual. The manual for this oscilloscope will be revised as needed. f you have

an oscilloscope with a newer serial prefix, please refer to the Agilent Technologies website and

download a newer manual edition in Adobe Acrobat (pdf) format. The Agilent Technologies

URL is: “www.agilent.com”. t will be necessary to search on a key word such as “ nfiniium

Service Guide”, and follow the links.

For additional information on configuration differences see the following sections in this service

guide:

• “To configure the motherboard jumpers and setup the B OS” in the Troubleshooting section

5 for information on determining:

•which computer configuration is contained in your oscilloscope

•setting up the BIOS correctly for that configuration

•setting the motherboard jumpers if the PC motherboard is changed.

• Replaceable Parts section 7.

This section contains exploded views for the different motherboard configurations, cabling

schemes, and outside hardware versions. The Replaceable Parts List also contains the

assembly part numbers for the different oscilloscope configurations.

Table 1-1 Oscilloscopes Covered by this Service Guide

The oscilloscope can be identified by the product number on the back panel.

Model Description

Agilent 54846A Four-channel digitizing oscilloscope with 8 GSa/s sample rate in 2-channel mode, 4

GSa/s sample rate in 4-channel mode, 2.25 GHz bandwidth

Agilent 54845A Four-channel digitizing oscilloscope with 8 GSa/s sample rate in 2-channel mode, 4

GSa/s sample rate in 4-channel mode, 1.5 GHz bandwidth

Agilent 54835A Four-channel digitizing oscilloscope with 4 GSa/s sample rate in 2-channel mode,

2 GSa/s sample rate in 4-channel mode, 1 GHz bandwidth

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