Agilent Technologies 54845B Bedienungsanleitung

Service Guide

Publication Number 54846-97002

December 2001

This manual applies directl to Infiniium oscilloscopes with model number sufixes “B.”

For Safet information, Warranties, and Regulator

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

Cop right Agilent Technologies 2001

Agilent Model 54845B/46B

Oscilloscopes

The Agilent Technologies Infiniium Oscilloscope Model 54845B/46B 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 54845B 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 54846B 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

•1MΩor 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

In This Book

This book provides the service documentation for the Agilent Technologies 54845B/46B

oscilloscope. It is divided into eight chapters.

Chapter 1 provides general information and specifications.

Chapter 2 shows ou 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 the

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 briefl covers the internal operation of the oscilloscope.

At the back of the book ou will find Safet information, Warranties, and Regulator information.

Contents

Contents–1

1 General Information 1-2

Instruments covered b this service guide 1-2

Accessories supplied 1-3

Options available 1-4

Accessories available 1-5

Specifications & characteristics 1-7

Agilent Technologies 54845B/46B 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 cordless trackball 2-5

To attach the optional cordless ke board and mouse 2-6

To connect the ke board 2-6

To connect to the LAN card 2-7

To connect oscilloscope probes 2-7

To connect a printer 2-9

To connect an external monitor 2-10

To connect the GPIB cable 2-10

To tilt the oscilloscope upward for easier viewing 2-11

To power on the oscilloscope 2-12

To verif basic oscilloscope operation 2-13

To clean the instrument 2-14

To clean the displa monitor contrast filter 2-14

3 Testing Performance 3-2

Testing Interval 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 accurac 3-7

To test offset accurac 3-11

To test bandwidth 3-13

To test time measurement accurac 3-16

To test trigger sensitivit 3-23

Contents

Contents–2

4 Calibrating and Adjusting 4-2

Equipment Required 4-2

Self Calibration Interval and Hardware Adjustments 4-2

Mainframe Cal Factor Memor 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 suppl 4-4

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

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

To run the self calibration 4-10

Troubleshooting -2

Safet 5-2

Tools Required 5-2

ESD Precautions 5-2

Ke stroke Conventions 5-2

Default Setup 5-3

To install the fan safet shield 5-3

To troubleshoot the instrument 5-4

Primar Trouble Isolation 5-6

No Displa Trouble Isolation 5-10

Power Suppl Trouble Isolation 5-12

To check probe power outputs 5-15

To Check the ke board; Troubleshooting Procedure 5-16

To check the LEDs 5-17

To check the motherboard, CPU, and RAM 5-18

To check the SVGA displa board video signals 5-19

To check the backlight inverter voltages 5-20

POST Code Listing 5-21

To Configure the motherboard jumpers and setup BIOS 5-23

To troubleshoot the acquisition s stem 5-26

To troubleshoot attenuator failures 5-33

Software Revisions 5-36

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 M lar flex cables 6-5

To remove and replace the AutoProbe assembl 6-6

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

To remove and replace the backlight inverter board 6-10

To remove and replace the front panel assembl 6-11

To remove and replace the ke board and flat-panel displa assemblies 6-14

To remove and replace the acquisition board assembl 6-17

To remove and replace the GPIB interface board 6-18

To remove and replace the scope interface board and SVGA displa board 6-19

To remove and replace the LS120 flopp disk drive 6-20

Contents

Contents–3

To remove and replace the hard disk drive 6-21

To remove and replace the CD-ROM drive 6-23

To remove and replace the motherboard 6-24

To remove and replace the power suppl 6-27

To remove and replace the fan controller board 6-29

To remove and replace the fan 6-30

To remove and replace an attenuator 6-31

To reset the attenuator contact counter 6-33

To remove and replace an acquisition h brid 6-35

7 Replaceable Parts 7-2

Ordering Replaceable Parts 7-2

Power Cables and Plug Configurations 7-3

Exploded Views 7-5

Replaceable Parts List 7-10

8 Theory of Operation 8-3

Block-Level Theor 8-3

Attenuator Theor 8-7

Acquisition Theor 8-7

Contents

Contents–4

Instruments covered b this service guide 1-2

Accessories supplied 1-3

Options available 1-4

Accessories available 1-5

Specifications & characteristics 1-7

Agilent Technologies 54845B/46B general characteristics 1-14

Recommended test equipment 1-16

General Information

1–2

General Information

This chapter of the Agilent Technologies Infiniium Oscilloscope Service Guide gives

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

chapter.

• Instrument identification

• Options

• Accessories

• Specifications and characteristics

• Test equipment requirements

Instruments covered y this service guide

On the rear panel of the instrument is a serial number label and a VIN # XXX. The serial number

is composed of two parts. The first part contains two letters and two numbers that signif the

instrument’s count of origin and ear date code. The second part, or the last six digits from the

right, contains a rolling number that is different for each Infiniium. This manual applies to “B”

model Infiniinums at release date. This manual ma not reflect changes made to the oscilloscope

after the release data listed on the title page.

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

This newer serial prefix indicates that the oscilloscope ma be different from those described in

this manual. The manual for this oscilloscope will be revised as needed. If ou have an

oscilloscope with a newer serial number, 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”. It will be necessar to search on a ke word such as “Infiniium

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 BIOS” 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

assembl part numbers for the different oscilloscope configurations.

Table 1-1 Oscilloscopes Covered by this Service Guide

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

Model Description

Agilent 54846B 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 54845B 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

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