Agilent Technologies 54835A, 46A, 45A User Manual

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Service Guide

Publication Number 54845-97008 February 2001

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

• XX3625 through XX4106 and above

for information about serial numbers, see “Instruments 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

Glance

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

Ease of use with high performance

The Agilent Technologies Infiniium oscilloscopes combine unprecedented ease-of-use with highperformance digitizing oscilloscope functionality to simplif y your design and analysis measurem ent 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 colorcoded to make identification easy

• Graphical interface menus and toolbars simplify complex measurement setups

Horizontal controls set sweep 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

•1 M

Ω or 50Ω input impedance

• Input attenuation adjustable from 2 mV/div to 1 V/div (plus 2 V/div in 1 M

• 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

∆−time at any point on the displayed

or 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.

Ω)

Display and Graphical Interface

Horizontal controls

Acquisition and general controls

Floppy Disk Drive

Power

Marker and Quick Measurements

Vertical Controls

AutoProbe Interface

Vertical Inputs

Trigger Setup

Auxiliary Trigger Input

iii

In This Book

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

Contents 1

1 General Information 1-2

Instruments 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 GPIB 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 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 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 Interval and Hardware Adjustments 4-2

Contents-1

Contents

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

5 Troubleshooting 5-2

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 Isolation 5-6 No Display Trouble Isolation 5-9 Power Supply Trouble Isolation 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 (AMI Motherboard only) 5-24 To configure the motherboard jumpers and set up the BIOS 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 GPIB 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–2

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 SIMMs or SDRAM DIMMs 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

Contents–3

General Information

This chapter of the Agilent Technologies Infiniium Oscilloscope Service Guide gi v es you 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 by this service guide

On the rea r panel of the instrum ent is a se rial number label and a VIN # la bel. The seria l number is in the form of XX00000000 while the VIN # is in the form of VIN # 0XX. The serial number is com pose d of two par t s: th e first t wo lett e r s and the first fo ur numbe rs are the seria l p refi x , w h ile th e l as t f our nu mb ers a re th e su ff ix . T he p re fi x is no rm al ly t he sa me f or al l i den ti ca l o sci ll os co pes 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. If 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”. It will be necessary to search on a key 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 assembly part numbers for the different oscilloscope configurations.

Table 1-1

Oscilloscopes Covered by this Service Guide

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

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

1–2

Chapter 1: General Information

Accessories supplied

The following accessories are supplied.

• Agilent Mouse, Agilent P/N C3751-60201

• Agilent Mouse Pad, Agilent P/N 54810-85903

•1 Keyboard

• (4) Agilent 1161A 10:1 10 M

• Accessory Pouch (Agilent P/N 54810-68701)

• Power cord (see chapter 7, “Replaceable Parts,” for available power cords)

• User's Quick Start Guide

• Programmer’s Guide and Programmer’s Quick Reference

• Agilent Technologies Infiniium Oscilloscope Service Guide for Agilent Models 54835A/45A/46A (this manual)

Ω passive probes

1–3

Chapter 1: General Information

Options available

The following options are available for the Agilent Technologies Infiniium oscilloscope.

Table 1-2

Agilent Technologies Infiniium Oscilloscope Model 54835A/45A/46A Options

Option Number Description

090 Delete standard probes

001 Add 2 standard probes—Agilent 1161A probes for the Agilent 54835A/45A/46A

002 Add 1 Agilent 1162A 1:1 passive probe

003 Add 1 Agilent 1163A 10:1 500 Ω, low-C passive probe

006 Add 1 Agilent 1152A 2.5 GHz, 0.6 pF active probe

007 Add 1 Agilent E2613A, 0.5 mm wedge kit assembly

008 Add 1 Agilent 1153A 200 MHz differential probe

009 Add 1 Agilent 1154A 500 MHz differential probe

010 Add 1 Agilent 1159A 1 GHz differential probe

100 Communication Mask Test Kit

200 VoiceControl Option

1BP MIL-STD-45662A and ANSI/NCSL Z540 calibration with test data

1CM Add 1 Rackmount kit (Agilent E2609A)

UL6 Add 1 Clip-on trackball pointing device (Agilent E2611A)

UL5 Add 1 touchpad pointing device (Agilent E2612A)

W32 3 years calibration service

W34 3 years return standards comp cal service

W50 5 years return repair service (additional 2 years)

W52 5 years return calibrations service

W54 5 years return standards comp cal service

Other options are available. See your Agilent Technologies Sales Representative. You can order multiple options, or you can order most of these options separately, using the Agilent model number or part number.

1–4

Chapter 1: General Information

Accessories available

The following accessories are available for use with the Agilent Technologies Infiniium oscilloscope.

Table 1-3

Accessories for the Agilent Technologies Infiniium Oscilloscope Model 54835A/45A/46A

Agilent 1144A 800 MHz Active Probe

Agilent 1144-61604 Power Probe Extender

Agilent 1145A 2-channel 750 MHz SMT active probe

Agilent 1146A Oscilloscope AC/DC Current Probe

Agilent 1152A 2.5 GHz, 10:1, 100 kΩ, 0.6 pF Active Probe

Agilent 1153A 200 MHz Differential Probe

Agilent 1155A 750 MHz 2-Channel, Low-Mass Active Probe

Agilent 1161A Standard probes for the Agilent 54835A/45A/46A

Agilent 1162A 1:1 Passive Probe

Agilent 1163A 10:1 500-Ω, low-C Passive Probe

Agilent 1170A 500 MHz Low-Mass, miniature 10:1 10 M

Agilent 1171A 500 MHz Low-Mass, miniature 10:1 10 M

Agilent 1172A 500 MHz Low-Mass, miniature 20:1 10 M Agilent 1173A 500 MHz Low-Mass, miniature 20:1 10 MΩ Passive Probe

Agilent 1182A Testmobile

Requires Agilent 1142A power supply—Agilent 1144-61604 probe power extender also required when using 2 or more Agilent 1144A active probes

Requires Agilent 1142A power supply

Ω Passive Probe Ω Passive Probe Ω Passive Probe

Agilent 10020A Resistive Divider Probe Kit

Agilent 10240B BNC Blocking Capacitor

Agilent 10833A GPIB cable, 1 m

Agilent 10833B GPIB cable, 2 m

Agilent 10833C GPIB cable, 4 m

Agilent 10833D GPIB cable, 0.5 m

Agilent 11094B 75Ω Feedthrough Termination

Agilent 34810B Benchlink Oscilloscope Software

Agilent 34398A + Agilent 34399A

Agilent 54006A 6 GHz, 10:1 (500 Ω) or 20:1 (1 kΩ), .25 pF

Agilent 01144-61604 1:2 probe power fan-out (for use with Agilent 1144A and Agilent 1145A)

Agilent C2950A Parallel printer cable, 2 m

Agilent C2951A Parallel printer cable, 3 m

Agilent E2610A Keyboard

Agilent E2609A Rackmount Kit

Agilent E2611A Clip-on Track Ball Pointing Device

RS-232-C printer cable + adapter kit

1–5

Chapter 1: General Information

Accessories available

Agilent E2612A Touchpad Pointing Device

Agilent E2625A Communication Mask Test Kit

Agilent 54810-68703 Service Kit (includes service software and fan safety shield)

Agilent 54801-00601 Fan Safety Shield (clips onto side of chassis with cover removed)

Agilent E2635A Voice Control Retrofit Kit

Agilent E2636A Microphone Replacement

1–6

Chapter 1: General Information

Specifications & characteristics

The following tables list the performance specifications and operating characteristics for the Agilent Technologies 54835A/45A/46A oscilloscope. Asterisks (*) denotes warranted specifications, all others are typical. Specifications are valid after a 30 minute warm-up period, and within

Acquisition

± 5 °C from the self-calibration temperature.

Maximum Sample Rate Real Time Agilent Models

Maximum Effective Sample Rate Equivalent Time 500 GSa/s

Memory Depth 2-channel mode: 65,536 points

4-channel mode: 32,768 points

Memory Depth Modes Auto Optimized for best combination of

Manual Selectable

Sampling Modes Real Time Successive single shot acquisitions.

Equivalent Time Random repetitive sampling (higher

Filters 9-bit Bandwidth Limit filter: BW = (Sample Rate)/20

(Sin x)/x Interpolation: On/Off selectable FIR digital filter. Digital signal processing adds points between acquired data points to enhance measurement accuracy and waveform display quality. BW= Sample Rate/4

54835A — 2-channel mode: 4 GSa/s 54835A — 4-channel mode: 2 GSa/s 54845A — 2-channel mode: 8 GSa/s 54845A — 4-channel mode: 4 GSa/s 54846A — 2-channel mode: 8 GSa/s 54846A — 4-channel mode: 4 GSa/s

Agilent 54835A, Agilent 54845A, and Agilent 54846A

update rate and display quality.

2-channel mode: from 16 to 65,536 points 4-channel mode: from 16 to 32,768 points

time resolution at fast sweep speeds).

Averaging Selectable from 2 to 4096.

1–7

Chapter 1: General Information

Specifications & characteristics

Vertical

Number of Channels 4 (simultaneous acquisition) Bandwidth Analog Bandwidth (-3dB)* 50Ω: 1.0 GHz — Agilent 54835A

System Bandwidth Agilent 1161A 10:1 passive probe: 500 MHz

Real Time bandwidth* 50Ω:

Rise Time

50Ω: 350 ps (Agilent 54835A) 50Ω: 233 ps (Agilent 54845A)

50Ω: 156 ps (Agilent 54846A) 1 MΩ: 700 ps

Sensitivity

1 MΩ Coupling: 2 mV/div to 2 V/div

50 Ω Coupling: 2 mV/div to 1 V/div Input Impedance* 1 MΩ ± 1% (≅12 pf), or 50 Ω ± 1.5% VSWR (50 Ω) 54835A/45A

dc to 500 MHz: 1.30

500 MHz to 1 GHz: 1.50

1 GHz to 1.5 GHz: 1.75

Input Coupling dc, ac (7 Hz, available in 1 MΩ only) Maximum Input Voltage 1 MΩ: ± 100 V (dc + ac) [ac<10 kHz], CAT I

rms

, CAT I

Channel-to-channel Isolation (with channels at equal sensitivity)

50 Ω: 5 V

54835A/54845A

dc to 100 MHz: 40 dB

100 MHz to 1 GHz: 30 dB

1 GHz to 1.5 GHz: 25 dB

Offset Range Vertical Sensitivity Available Offset

1 MΩ:

2 mV to 104 mV/div

> 104 mV to 2 V/div

50Ω: all

Full-resolution channel

10, 20, 50, 100, 200, 500, 1000 mV/div (plus 2000 mV/div in 1 MΩ) scales

Dynamic Range ± 8 div from center screen

dc Gain Accuracy

Resolution

± 1.00% of full scale at full-resolution channel scale.

Real Time 8 bits (0.4% of full scale), 12 bits with

Equivalent Time 8 bits (0.4% of full scale), 12 bits with

50Ω: 1.5 GHz — Agilent 54845A 50Ω: 2.25 GHz — Agilent 54846A 1 MΩ: 500 MHz (with Agilent 1161A probe)

Agilent 1162A 1:1 passive probe: 25 MHz Agilent 1163A 10:1, 500 Ω passive probe:

1.5 GHz Agilent 1152A 2.5 GHz, 0.6 pF active probe:

1.3 GHz (Agilent 54845A) Agilent 1152A 2.5 GHz, 0.6 pF active probe:

1.0 GHz (Agilent 54835A) Agilent 1153A 200 MHz differential probe: 200 MHz

Agilent 54835A — 1 GHz (2-channel mode) Agilent 54835A — 500 MHz (4-c hannel mode) Agilent 54845A — 1.5 GHz (2-channel mode) Agilent 54845A — 1.0 GHz (4-channel mode) Agilent 54846A — 2.25 GHz (2-cha nnel mode) Agilent 54846A — 1.0 GHz (4-channel mode) 1 MΩ: 500 MHz

54846A dc to 500 MHz: 1.30 500 MHz to 1 GHz: 1.50 1 GHz to 1.5 GHz: 1.75

1.5 GHz to 2.25 GHz: 2.50

54846A dc to 100 MHz: 40 dB 100 MHz to 1 GHz: 30 dB 1 GHz to 2.25 GHz: 24 dB

± 4 V ± 40 V ± 12 div

sufficient averaging (0.024% of full scale)

1–8

Chapter 1: General Information

Specifications & characteristics

Offset Accuracy*

dc Voltage Measurement Accuracy*

± (1.00% of channel offset + 1% of full scale) at full-resolution channel scale. Dual Cursor ±[(dc gain accuracy)+(resolution)]

Single Cursor ±[(dc gain accuracy)

+(offset accuracy)+(resolution/2)]

AutoProbe Interface AutoProbe is an intelligent communication and power link between compatible

probes and Infiniium scopes. AutoProbe completely configures the scope for the attached probe . For instance, it identifies t he probe type and sets up the pro per input impedance, attenuation ratio, probe power and offset range, as needed.

Horizontal

Main Time Base Range 100 ps/div to 20 s/div

Horizontal Position Range pre-trigger 0 to -1 s or one full screen width,

post-trigger 0 to 1 s or one full screen width,

Delayed Sweep Range 1 ps/div to current main time base setting.

Delayed Sweep Delay Range Within main time base acquisition record.

Resolution 2 ps

Timebase Accuracy 70 ppm (.007%)

∆t Accuracy* Real Time mode

whichever is larger.

±[(.007%)(∆t)+(0.2)(sample period)]

Equivalent Time mode ±[(.007%)(∆t)+(full scale/

(2 × memory depth)) + 30 ps] (Example: for ≥ 16 avgs, 9 ns signal, 1 ns/div, 1 channel, then accuracy = ±[(.007%)(9 ns)+(10 ns/(2 × 65,536)) + 30 ps] = 31 ps)

1–9

Chapter 1: General Information

Specifications & characteristics

Trigger

Sensitivity*

Internal dc to 100 MHz: 0.5 div

100 MHz to 500 MHz: 1.0 div 500 MHz to 1 GHz: 1.5 div

Auxiliary dc to 500 MHz: 300 mV

Maximum Input Voltage* Auxiliary ±15 V, CAT I

Minimum Pulse Width (internal, external)

Level Range Internal ±8 div from center screen

Sweep Modes Auto, triggered, single

Trigger Coupling dc, ac (7 Hz), low frequency reject (50 kHz), high frequency reject (50 kHz).

Trigger Holdoff Range 60 ns - 320 ms

Trigger Modes Edge, Glitch, Pattern, State, Delay by Time, Delay by Events, Violation (

Glitch Select positive or negative polarity, width. Captures glitches as narrow as 500 ps.

Pattern Select inputs as High, Low or X (don’t care) to create pattern. Trigger when

State Select one channel as clock, specify other inputs as High, Low or X.

Delay by Time Time: 30 ns to 160 ms. The trigger is qualified by an edge. After the delay, a

Delay by Events Events: 1 to 16,000, 000 rising or falling edges. The trigger is qualified by an edg e.

500 ps at > 1.0 div

Auxiliary ±5 V

Setup/Hold Time, Pulse Width, Transition), Video, Line.

pattern is entered, exited, present > t, present < t, or present over a range of time. Captures patterns as narrow as 500 ps.

Logic Type: AND or NAND

rising/falling edge on any one selected input will generate the trigger.

After the delay, a rising/falling edge on any one selec ted input will generate the trigger.

Violation Trigger Setup/Hold Modes: Setup, Hold or Setup and Hold.

Pulse Width Triggers on pulse width >t, or <t.

Transition Select Rise Time or Fall Time,

Accuracy (time) for glitch, pulse width, and time-qualified pattern

Video Triggering 525 lines/60 Hz (NTSC), 625 lines/50 Hz (PAL), 875 lines/60 Hz. Trigger on Field 1

1.5 ns - 20 ns: ±(20% setting + 500 ps) 20 ns - 160 ms: ±(3% setting + 2 ns)

or Field 2, any line. User defined triggering: User can specify sync pulse level, width and polarity, edge number.

Select Clock, Thresholds, setup and/or hold time.

Captures pulses as narrow as 500 ps.

present > t or present < t, thresholds.

1–10

Display

Chapter 1: General Information

Specifications & characteristics

Display 8.4-inch diagonal color active matrix LCD module incorporating amorphous

silicon TFTs.

Active Display Area 171 mm x 128 mm (21,888 sq. mm)

Waveform Viewing Area 104 mm x 159 mm (16,536 sq. mm) in Full screen mode

(graphical user interface off)

Display Resolution 640 pixels horizontally x 480 pixels vertically

Waveform Colors Select from 100 hues, 0-100% saturation and 0-100% luminosity.

Dual Intensity Infinite Persistence Previous sweeps are stored in half bright display and most recent sweep in full

bright. This allows easy differentiation of current and historic information.

Waveform Overlap When two waveforms overlap, a third color distinguishes the overlap area.

Full screen mode On/Off selectable.

Connect-the-dots On/Off selectable.

Persistence Minimum, Variable (100 ms to 40 s), Infinite. Up to 6 levels of grey scale.

Graticule On/Off (Grid or Frame).

Grid Intensity 0 to 100%

Display Update Rate (for instruments equipped with AMD-K6-2 400 MHz processor)

Measurement Conditions Real Time sampling mode, minimum

persistence, triggered sweep, no interpolation, markers off, math off, connect the dots off, 1 channel acquisition, 50 ns/div, statistics off.

512 point record (2 GSa/s) Waveforms/sec: > 2,100

Measurements/sec: > 130

Measurements

, V

Automatic Parametrics 33 automatic measurements: V

Preshoot, Overshoot, V

upper

, V

pp middle

min

, V

max ,Vavg

lower

Frequency, Positive Width, Negative Width, Duty Cycle, Delta Time, T FFT Frequency, FFT Magnitude, FFT Delta Frequency, FFT Delta Magnitude, Eye Height, Eye Width, Jitter, Crossing %, Q-factor, Duty Cycle Distortion. Over GPIB only: VTime, TVolts.

Threshold Definition Selectable 10%, 50%, 90% or 20%, 50%, 80% or Custom (% or absolute voltage).

Top-Base Definition Standard or Custom (in absolute voltage).

Statistics On/Off selectable. Current measurement, mean, and standard deviation

Measurement Toolbar 16 Drag and Drop automatic measurement icons.

QuickMeas Activates 4 preselected automatic measurements.

Markers Modes Manual Markers, Track Waveform Data, Track Measurements.

Waveform Math 4 function waveforms f1-f4. Select from Add, Subtract, Multiply, Divide, Invert,

Magnify, Vs, Min, Max, Integral, Differentiate, FFT Magnitude.

, V

amptd

base

top

, V

, Rise Time, Fall Time, Period,

max

, T

rms

min

1–11

Chapter 1: General Information

Specifications & characteristics

FFT

Frequency Range

Freq. Accuracy (1/2 frequency resolution)+(7x10

Amplitude Display Power in dBm

Agilent 54835A — 2-channel mode: dc to 2 GHz (Sample rate/2) Agilent 54835A — 4-channel mode: dc to 1 GHz (Sample rate/2)

Agilent 54845A — 2-channel mode: dc to 4 GHz (Sample rate/2) Agilent 54845A — 4-channel mode: dc to 2 GHz (Sample rate/2) Agilent 54846A — 2-channel mode: dc to 4 GHz (Sample rate/2) Agilent 54846A — 4-channel mode: dc to 2 GHz (Sample rate/2)

-5

)(signal frequency)

Signal-to-noise ratio 70 dB at 32K memory depth. Noise floor varies with memory depth and with

averaging.

Window Modes Hanning, Flattop, Rectangular.

Computer System/ Storage

CPU AMD-K5

Disk Drive 1.4 GByte, 2.1 GByte, or higher

File types Waveforms Internal Y values; X and Y values in ASCII

Mouse Standard mouse supplied—supports any Microsoft

Operating System Microsoft Windows 95 or Microsoft Windows 98

Waveform Memories 4 nonvolatile waveform reference memories.

™

PR133 Microprocessor (instrument serial numbers US37349999 and below) or AMD-K6™ 200 MHz Microprocessor or AMD-K6/300

™

or AMD-K6-2/300™ 300 MHz Microprocessor

Store and recall setups, waveforms, and internal hard drive depending upon the vintage. Storage capacity is limited only by disk space. 3.5", 1.44 Mbyte MS-DOS

™

-compatible high

store screen images to both the hard drive

and the floppy drive.

density floppy disk drive or LS-120 MS-DOS 120 MByte floppy disk drive.

or Microsoft Excel formats.

Images BMP, EPS, GIF, PCX, PS (Postscript), TIF.

mouse compatible pointing

device, serial or PS/2.

I/O

LAN Enables data/setup file transfers and use of network printers; supports popular

GPIB Fully programmable, complies with IEEE 488.2.

RS-232 (serial) 2 ports: COM1, COM2. Printer and pointing device support.

Centronics Printer port.

USB Two pinheads link with Universal Serial Bus connectors (USB1 and USB2)

Printers and Plotters Supports all pr inters and plotters compat ible with Microsoft Windo ws95

PS/2 port For PS/2 mouse.

Keyboard port For optional keyboard.

network operating systems including Novell NetWare, Microsoft, Banyan VINES, SCO UNIX and IBM; 10 Mbps operation that complies with IEEE 802.3 Ethernet and ISO/IEC 8802-3 Ethernet standards; TCP/IP protocol; RJ-45 connector.

peripheral devices via either a dual-port USB cable or a single-port USB cable on some configurations with serial prefixes US39480000 and above.

. Includes but is not limited to Hewlett-Packard Deskjet and Laserjet printers. GPIB devices not supported.

1–12

Video Output 15-pin VGA, full color.

Notes

1 Rise Time figures are calculated from: tr=.35/Bandwidth.

Chapter 1: General Information

Specifications & characteristics

2 Magnification is used below the 10 mV/div range and between the major attenuation settings. Full scale

3N/A

4 For bandwidth limited signals, tr >=1.4 x sample interval.

5 FFT amplitude readings are affected by input amplifier roll-off (-3 dB, with amplitude decreasing as

is defined as the major attenuator setting over an intermediate setting. (Major settings for 50Ω: 10, 20, 50, 100, 200, 500, 1000 mV Major settings for 1 MΩ: all as for 50Ω plus 2 V)

frequency increases above 500 MHz in 1 MΩ, 2.25 GHz for Agilent 54846A, 1.5 GHz in 50 Ω for Agilent 54845A, 1 GHz in 50Ω for Agilent 54835A).

CAT I and CAT II Definitions

Installation category (overvoltage category) I: Signal level, special equipment or parts of equipment, telecommunication, electronic, etc., with smaller transient overvoltages than installation category (overvoltage category) II.

Installation category (overvoltage category) II: Local level, appliances, portable equipment etc., with smaller transient overvoltages than installation category (overvoltage category) III.

1–13

Chapter 1: General Information

Agilent Technologies 54835A/45A/46A general characteristics

The Infiniium oscilloscopes meet the Agilent Technologies Environmental Specification (section

750) for class B-1 products with exceptions as described for temperature.

General Characteristics

Environmental Temperature Operating: 10°C to +40°C

Humidity Operating: Up to 95% relative humidity

Altitude Operating: Up to 4 600 meters

Vibration Operating: Random vibration 5-500 Hz,

Physical Size (excluding handle) Height: 216 mm

Weight Net: approximately 12 kg

Power Line voltage selection None, PFC (Power Factor Correction)

Line voltage range 100-240VAC, ± 10% CAT II

Line frequency 47 to 440 Hz

Nonoperating: –40°C to 70°C Indoor use only

(noncondensing) at +40°C Nonoperating: Up to 90% relative humidity at +65°C

Nonoperating: Up to 15 300 meters

10 minutes per axis, 0.3g (rms) Nonoperating: Random vibration 5-500 Hz, 10 minutes per axis, 2.41g (rms)

Resonant search 5-500 Hz, swept sine, 1 octave/minute sweep rate, (0.75g), 5-minute resonant dwell at 4 resonances per axis.

Width: 437 mm Depth: 440 mm

Shipping: approximately 15 kg

Maximum power consumption 390 W

Safety Meets IEC1010-1 +A1, CSA certified to C22.2 No. 1010. 1, Self certified to UL 3111.

1–14

Chapter 1: General Information

Agilent Technologies 54835A/45A/46A general characteristics

1–15

Chapter 1: General Information

Recommended test equipment

The following table is a list of the test equipment required to test performance, calibrate and adjust, and troubleshoot this instrument. The table indicates the critical specification of the test equipment and for which procedure the equipment is necessary. Equipment other than the recommended model may be used if it satisfies the critical specification listed in the table.

Recommended Test Equipment

Equipment Required Critical Specifications Recommended Model Use *

Signal Generator 1 - 2.25 GHz, sine wave, amplitude 30 - 200

RF Amplifier 22 dB gain at 10 MHz, 1.3 GHz bandwidth Agilent 8447D/F P

Power Meter/Power Sensor

DMM 6 1/2 digit (0.1 mV) resolution, dcV accuracy

Power Supply 7 mV - 30 V dc, 0.1 mV accuracy and resolution Agilent 6114A P Power Splitter 50 Ω type N, outputs differ by <0.15 dB Agilent 11667A P

Probe No substitute Agilent 1161A P

Probe Tip Adapter 1160 series to BNC Agilent 5063-2143 P

Oscilloscope General-purpose Agilent 54622A P, T Blocking Capacitor 0.18 µF Agilent 10240B P

Cable Type N (m)(m) - 3 foot Agilent 11500A or B P

Cable (2) BNC - 3 foot Agilent 10503A P, A, T

Cable (3) BNC - 9 inch Agilent 10502A P, A, T

Adapter N (m) to BNC (m) Agilent 1250-0082 P

Adapter N (m) to BNC (f) Agilent 1250-0780 P

Adapter N (f) to BNC (m) Agilent 1250-0077 A

Adapter (2) BNC tee (m)(f)(f) Agilent 1250-0781 P, T

Adapter BNC (f)(f) Agilent 1250-0080 T

Adapter (2) BNC (f) to dual banana (m) Agilent 1251-2277 P Termination BNC connectors 50 Ω Agilent 10100C P

Shorting cap BNC Agilent 1250-0774 P Resistor (2) 5 Ω, 5 W Agilent 0812-0047 T

Video monitor Accepts VGA-standard video signals T

Keyboard PC-compatible, AT 5-pin connector Agilent E2610A T

Mouse PS/2 compatible Agilent C3751-60201 P, T

POST Card Power-on self test card compatible with PC-

Fan Safety Shield Clips onto side of chassis with cover removed Agilent 54801-00601 A, T

Service software No substitution Agilent 54810-68700 T

Note: the Fan Safety Shield and Service software are part of the Service Kit, Agilent P/N 54810-68703.

* P = Performance Tests, A = Adjustments, T = Troubleshooting

, time base accuracy 0.25 ppm

rms

1 - 500 MHz, -70 dBm to +44 dBm, ±3% accuracy Agilent EPM-

8 ppm/year, 4-wire resistance acc. ±0.25%

compatible systems

Agilent 8664A P

441A/Agilent 8482A

Agilent 34401A P, A, T

1–16

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 GPIB 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

Preparing for Use

This chapter shows you how to prepare the Agilent Technologies 54835A/45A/46A oscilloscopes for use. The following areas are covered in this section.

•Inspection

•Setup

• Connecting a signal

•Cleaning

Following instrument setup is a brief section covering oscilloscope operation. If you are unfamiliar with this oscilloscope's operation, refer to the User’s Quick Start Guide. The topics covered include:

• Using the front panel

• Using the graphical interface

• Starting and stopping acquisition

• Adjusting oscilloscope configuration

• Making measurements

The Infiniium Oscilloscope is designed to make it easy for you to use a high-performance digitizing oscilloscope.

• The familiar front-panel oscilloscope interface with knobs and buttons is optimized for the most common kinds of troubleshooting tasks and basic measurements.

• The graphical interface with menus, windows, dialogs, and toolbars provides easy logical access to dozens of configuration and analysis tools, making it easy for you to set up and make the most complex measurements.

2–2

Chapter 2: Preparing for Use

To inspect the instrument

Setting Up the Oscilloscope

This section will help you get the instrument ready to use. Included are procedures for:

•Inspection

•Connecting power

• Connecting probes and accessories

• Connecting peripherals

• Verifying basic operation

•Cleaning

To inspect the instrument

❏ Inspect the shipping container for damage.

Keep a damaged shipping container or cushioning material until the contents of the shipment have been checked for completeness and the instrument has been checked mechanically and electrically.

❏ Check the accessories.

Accessories supplied are listed in chapter 1 of this service guide.

• If the contents are incomplete or damaged notify your Agilent Technologies Sales Office.

❏ Inspect the instrument.

• If ther e is mec hanical damage or defect, or if th e instrument does not operate properly or pa ss performance tests, notify your Agilent Technologies Sales Office.

• If the shipping container is damaged, or the cushioning materials show signs of stress, notify the carrier as well as your Agilent Technologies Sales Office. Keep the shipping materials for the carrier's inspection. The Agilent Technologies office will arrange for repair or replacement at Agilent Technologies' option without waiting for claim settlement.

2–3

Chapter 2: Preparing for Use

To connect power

The instrument Power Factor Correction (PFC) circuitry in the oscilloscope’s power supply operates over a line voltage in the range of 100 to 240 Vac to the input voltage and frequency). Line frequency must be in the range 47 to 440 Hz. Power consumption is 390W maximum.

Position the instrument where it will have sufficient clearance for airflow around the top, back, and sides.

±10% (the power supply is autoranging

Minimum 0 mm

Minimum 15.9 mm (maintain ed by feet; however, do not place on soft surfaces that will impede airflow)

Airflow requirements Agilent 54835A/45A/46A – 250

2 Connect the power cord to the rear of the oscilloscope, then to a suitable ac voltage

source.

Minimum 38.1 mm

Minimum

15.9 mm both sides

The line cord provided is matched by Agilent Technologies to the country of origin of order. Ensure that you have the correct line cord. See “Power Cables and Plug Configurations” in chapter 7.

WARNING SHOCK HAZARD!

BEFORE YOU CONNECT THIS INSTRUMENT TO MAINS POWER OR LIVE MEASURING CIRCUITS, you must provide a protective earth ground. Failure to provide a protective earth ground could result in a shock hazard if there is a failure in this instrument or equipment connected to it. The mains plug must be inserted in a socket outlet provided with a protective earth contact. Do not use an extension cord (power cable) without a protective conductor (grounding). Grounding one conductor of a two-conductor outlet does not provide an instrument ground.

A Three-wire Power Cable is Provided

This instrument is provided with a three-wire power cable. When connected to an appropriate ac power outlet, this cable grounds the instrument cabinet.

2–4

Chapter 2: Preparing for Use

To connect the mouse or other pointing device

• Plug the mouse into the matching connector on the back panel of the oscilloscope.

The mouse is included with the oscilloscope, but using it is optional. While you can operate many oscilloscope functions with only the front-panel keys and knobs, you will need the mouse to access advanced oscilloscope functions through the graphical interface, or to find out more about the oscilloscope through the built-in information system.

The optional touchpad pointing device connects in exactly the same way as the mouse.

The supplied mousepad provides the correct surface for smooth mouse operation. To modify the mouse configuration, see the User’s Quick Start Guide.

To attach the optional trackball

1 Push in the latch on the trackball baseplate to extend the metal tabs. Insert the lower

tab into the frontmost slot on the side of the oscilloscope. You can only install the trackball on the right side of the oscilloscope.

2–5

Chapter 2: Preparing for Use

To attach the optional trackball

While holding the latch in, slide the metal tabs up and to the rear of the oscilloscope

until they fully engage the slot.

3 Release the latch. The trackball baseplate should now be secure against the side of the

oscilloscope.

4 Snap the trackball assembly onto the pins of the baseplate. The trackball and buttons

should face up and toward the front of the oscilloscope.

5 Connect the 9-pin “D” connector on the trackball cable to the COM1 port on the back

panel. Tighten the retaining screws.

For information on changing the trackball settings, see the User’s Quick Start Guide.

2–6

Chapter 2: Preparing for Use

To connect the keyboard

• Plug the keyboard cable into the matching connector on the back panel of the oscilloscope.

The keyboard simplifies access to some oscilloscope functions, such as entering file names when you store waveforms and setups to the disk. If you need to free desk space, place the keyboard on top of the instrument. Do not stack other objects on the keyboard; this will cause self-test failures on power-on.

To connect to the LAN card

• Connect your LAN cable to one of the connectors on the LAN card. Make sure the connection is secure. Two connections are possible on the LAN card: the RJ-45 connection and a BNC connection. Units equipped with 10/100Base-T LAN cards have an RJ-45 connector only.

RJ-45 Connection

Each Infiniium Oscilloscope now ships with a LAN card installed. If you want a LAN connection, but have an older Infiniium Oscilloscope model that does not have a LAN card installed, contact your Agilent Technologies Sales and Service Office. An Agilent Technologies LAN Card Installation Kit with instructions is available from Agilent Technologies, and describes how to add a LAN card to your Infiniium Oscilloscope. After you have connected to the LAN card, you must set up the network as described in the User’s Quick Start Guide.

BNC Connection

2–7

Chapter 2: Preparing for Use

To connect oscilloscope probes

1 Attach the probe BNC connector to the desired oscilloscope channel or trigger input.

Push it straight on until it latches into place.

2 Connect the probe to the circuit of interest using grabbers or other probing aids.

3 To disconnect the probe, push the small latch on top of the probe connector to the left,

then pull the connector body away from the front panel of the oscilloscope without twisting it.

CAUTION AVOID DAMAGE TO THE PROBE CONNECTOR!

Do not a ttempt to t wist the sn ap-o n prob es on or off the oscil loscope’s B NC connector. T wisting the probe connector body will damage it.

CAUTION DO NOT EXCEED THE MAXIMUM INPUT VOLTAGE!

Do not ex ceed th e maxim u m in put vo ltage ratin g of th e osci llosc ope in puts! The max i m u m input voltage for 50(dc+ac) [ac < 10 kHz], CAT I. (Probes may have different ratings. See the probe documentation.)

Ω inputs is 5 V

, CAT I. The maximum input voltage for 1 MΩ inputs is ±100V

rms

2–8

Chapter 2: Preparing for Use

To connect a printer

If you have a parallel (Centronics) printer, you will need a parallel printer cable, such as an Agilent C2950A (2 m) or Agilent C2951A (3 m) cable. Go to step 1.

If you have a serial printer, you will need a 9-pin to 25-pin serial printer cable, such as an Agilent 34398A cable, plus the Agilent 34399A adapter kit. Some printers may require other cable configurations, but the oscilloscope has a 9-pin serial connector. Go to step 4.

Attach the 25-pin small “D” connector to the printer output connector on the rear of the oscilloscope. Tighten the thumbscrews to secure the cable.

2 Attach the larger 36-pin “D” connector to the printer. Latch the wire bails into the tabs

on each side of the connector.

3 Set the printer configuration to use the “Centronics” or “Parallel” interface, if

necessary. Refer to the User’s Quick Start Guide for software installation instructions.

See the documentation for your printer if you have questions about configuring the printer to use the parallel interface.

Connect the 9-pin “D” connector of the serial printer cable to the serial output port on the rear panel of the oscilloscope. Tighten the thumbscrews to secure the cable.

2–9

Chapter 2: Preparing for Use

To connect an external monitor

Attach the 25-pin “D” connector to the serial input port of the printer. Tighten the

thumbscrews to secure the cable.

6 Set the printer configuration to use the serial interface. Refer to the User’s Quick Start

Guide for software installation instructions.

See the documentation for your printer if you have questions about configuring the printer to use the serial interface.

To connect an external monitor

You can connect a VGA-compatible monitor to the Infiniium oscilloscope to provide a larger viewing area.

• Connect the monitor cable to the display board video connector at the rear panel of the oscilloscope. Tighten the retaining screws.

To connect the GPIB cable

• Attach the GPIB connector to the GPIB interface card connector at the rear of the oscilloscope. Tighten the thumbscrews on the connector.

2–10

Chapter 2: Preparing for Use

To tilt the oscilloscope upward for easier viewing

• If your oscilloscope has front feet with individual wire bails, lift up the front of the oscilloscope, grasp one of the wire bails under the front corner, and pull it down and forward until it latches into place. Repeat for the other wire bail.

• If your oscilloscope has front feet with a wire bail between the two feet, lift up the front of the oscilloscope, grasp the bail near the center, and pull it down and forward until it latches into place.

2–11

Chapter 2: Preparing for Use

To power on the oscilloscope

• Depress the power switch at the lower left-hand corner of the oscilloscope front panel.

After a short initialization period, the oscilloscope display appears. The oscilloscope is ready to use.

Hook up all cables and accessories before applying power. You can connect and disconnect probes while the oscilloscope is powered-on.

You Can Configure the Backlight Saver

The oscilloscope display has a backlight saver that turns off the backlight when there has been no interface activity for a pre-determined period. The default time is 8 hours and is configurable through the Display Setup dialog in the graphical interface. You can turn the display on by moving the mouse, typing on the optional keyboard, pressing a front-panel key, or turning a front-panel knob.

2–12

Chapter 2: Preparing for Use

To verify basic oscilloscope operation

1 Connect an oscilloscope probe to channel 1. 2 Attach the probe to the calibration output on the front panel of the oscilloscope.

Use a probe grabber tip so you do not need to hold the probe. The calibration output is marked with a square wave symbol.

Calibration Output

Press the Default Setup key on the front panel.

The display will pause momentarily while the oscilloscope is configured to its default settings.

4 Press the Autoscale key on the front panel.

The display will pause momentarily while the oscilloscope adjusts the sweep speed and vertical scale. You s houl d the n see a squarewa ve with pe ak-to-peak amp litu de ap proximate ly 5 d ivisions and a period of almost 3 divisions. If you do not see the waveform, ensure your power source is adequate, the oscilloscope is properly powered-on, and the probe is connected securely to the front-panel channel input BNC and to the probe calibration output.

Move the mouse pointer to the graphical interface enable button and click once.

The graphical interface enable button is in the upper-right corner of the display.

6 Move the mouse around the mouse pad and verify that the pointer follows on the

screen.

If the pointer does not move, ensure that the mouse is properly connected, that you have clicked the correct button to enable the graphical interface, and that the mouse is on a medi um-fr iction surface such as the mouse pad supplied with the oscilloscope.

With the mouse pointer on the right-hand button, click the mouse to enable the graphical interface

Graphical Interface Enable Button

2–13

Chapter 2: Preparing for Use

To clean the instrument

• Clean the oscilloscope with a soft cloth dampened with a mild soap and water solution.

CAUTION BE CAREFUL TO AVOID DAMAGING COMPONENTS!

Do not use too much liquid when cleaning the oscilloscope. Water can enter the front panel keyboard, damaging sensitive electronic components.

To clean the display monitor contrast filter

• Clean the display monitor contrast filter using glass cleaner and lens tissue or a soft cloth.

2–14

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

Procedure 3-4

To test input resistance 3-6

Procedure 3-6

To test voltage measurement accuracy 3-7

Procedure 3-7

To test offset accuracy 3-11

Procedure 3-11

To test bandwidth 3-13

Equivalent Time Test 3-13 Real Time Test 3-15 1 M

Ω, 500 MHz Test 3-15

To test time measurement accuracy 3-16

Equivalent Time Mode Procedure 3-16 Real-Time Mode Procedure 3-21

To test trigger sensitivity 3-23

Internal Trigger Test 3-23 Procedure—Auxiliary Trigger Test 3-25

Testing Performance

The procedures in this section test measurement performance using Performance Specifications given in chapter 1 as performance standards. Specifications applicable to individual tests are noted at the test for reference.

Testing Interval

The performance test procedures may be performed for incoming inspection of the instrument and should be performed periodically thereafter to ensure and maintain peak performance. The recommended test interval is yearly or every 2,000 hours of operation.

Test Interval Dependencies

The test interval depends on frequency and severity of use and the environmental conditions under which the instrument is used. In recording test results, you may find that the test interval could be shortened or lengthened; however, such a decision should be based on substantial quantitative data.

See Also Chapter 4, “Calibrating and Adjusting,” for information about the calibration cycle.

Equipment Required

A complete list of equipment required for the performance tests is in the Recommended Test Equipment table in chapter 1. Equipment required for individual tests is listed in the test. Any equipment satisfying the critical specifications listed may be substituted for the recommended model. The procedures are based on the model or part number recommended.

Self-Test Verification

To verify system operation with high confidence, without the test equipment and time required for performance tests, perform the self-tests. These internal tests verify many functions of the oscilloscope.

To run the self-tests, enable the graphical interface, then select Self Test from the Utilities menu. The Self Test drop down list box allows you to select Scope Self Tests, Key and Knob Test, or LED Test. A message is displayed with the instruction to remove all inputs to the instrument. During execution of the self-tests, the oscilloscope displays diagnostic messages indicating the status of each test.

If one of the self-tests fails, diagnostic code is displayed. This code is used by factory service personnel when troubleshooting the main assembly. Failure of a self-test indicates an assembly failure. The assembly must be replaced before y ou attempt performance verificat ion. For more troubleshooting information, refer to chapter 5, “Troubleshooting.”

FAILED is displayed rather than PASSED, and a 16-bit

3–2

Chapter 3: Testing Performance

Test Record

You can record the results of the performance tests in the Performance Test Record provide d at th e e n d of t h is cha p ter. T h e Perform a nce Te s t Reco r d lists t h e perf o rmanc e tests and provides an area to mark test results. You can use the results recorded at incoming inspection for later comparisons during periodic maintenance, troubleshooting, and after repairs or adjustments.

Operating Hints

Some knowledge of operating the oscilloscope is helpful; however, these procedures are written so that little experience is necessary. The following two hints will speed progress of the testing.

Clear Display

When using many averages, it often takes awhile for a waveform display to stabilize after a change. When a control on the oscilloscope is changed, averaging automatically restarts. When just the input signal is changed, the instrument must average new data with the old so it takes longer for the waveform to stabilize. Press the Clear Display key while changing input signals. The instrument will restart averaging and give a quick indication of the result of the signal change.

Averaging

Averaging is used to assure a stable signal for measurements. It is not necessary to wait for com plete stability of the signal (averagi ng com plete), as long a s the m easurement is well within the limits of the test.

Specifications

The specifications that apply to a particular test are given with the test procedure. The specification as given with the test may be abbreviated for clarity. In case of any questions, refer to the complete specifications and characteristics in chapter 1, “General Information.”

Performance Test Procedures

Performance test procedures start with the next paragraph. Procedures may be done individually and in any order.

Let the Instrument Warm Up Before Testing

Allow the instrument to warm up for at least 30 minutes prior to beginning performance tests. Failure to allow warm-up may cause the instrument to fail tests.

3–3

Chapter 3: Testing Performance

To test the dc calibrator

The Aux Out BNC on the front panel is used for self-calibration and probe calibration. Though calibrator accuracy is not specified in the performance specifications, it must be within limits in order to provide accurate self-calibration.

Figure 3-1

Test Limits: -2.5 v to +2.5 v, Accuracy

±0.2% of delta voltage output

Equipment Required

Equipment Critical Specifications Recommended Model/Part

Digital Multimeter 0.1 mV resolution, better than 0.1 % accuracy Agilent 34401A

Cable BNC Agilent 10503A

Adapter BNC (f) to banana (m) Agilent 1251-2277

Procedure

Connect the multimeter to the front panel Aux Out BNC.

Use the BNC cable and the BNC to banana plug adapter.

2 Enable the graphical interface.

Use the mouse t o click on th e bu tton in t h e upper ri ght-ha n d corner of the d ispla y . S ee figur e 3-1.

Click the mouse with the pointer on the right-hand button to enable the graphical interface

Enabling the graphical interface

3 Press Default Setup to set the oscilloscope to default conditions. 4 Select Calibration from the Utilities menu. 5 Select DC from the Aux Output drop-down list box.

See figure 3-2.

3–4

Figure 3-2

Set Aux Output to DC

Set the output voltage

Chapter 3: Testing Performance

To test the dc calibrator

Selecting DC in the Calibration Dialog

6 Set the dc output voltage to +2.500 V using the Level spin box or the numeric keypad

dialog.

You can access the numeric keypad dialog by clicking on the value in the Level box. Enter the values by clicking on digits, signs, and exponents in the keypad. Click Close when finished.

The DVM should read near +2.500 V. Record the reading to four significant digits. V1 = __________.

8 Set the level to -2.500 V using the Level spin box or the numeric keypad dialog. 9 The DVM should read near –2.500 V. Record the reading. V2 = __________.

10 Subtract the second reading from the first reading, then divide the result by 5.

For example, if the first reading is +2.498 V and the second reading is -2.497 V, then

V1 V2–

------------- ------5

The final result should be between 0.998 and 1.002. Record the result in the

2.489 2.497–()–

------------ ------------- ------------- ---0.999== 5

Performance Test Record at the end of the chapter.

12 Click Close to exit the calibration menu.

If the test fails

Repair is necessary. See chapter 5, “Troubleshooting.”

3–5

Chapter 3: Testing Performance

To test input resistance

This test checks the input resistance of the vertical inputs. A four-wire measurement is used to accurately measure the 50-

Ω and 1-MΩ inputs.

Figure 3-3

Specification: 1 M

Ω ±1% and 50 Ω ±1.5%

Equipment Required

Equipment Critical Specifications Recommended Model/Part

Digital Multimeter Measure resistance (4-wire) at better than

0.25% accuracy

Cables (2) BNC Agilent 10503A

Adapter BNC Tee (m)(f)(f) Agilent 1250-0781

Adapters (2) BNC (f) to dual banana (m) Agilent 1251-2277

Agilent 34401A

Procedure

Set up the multimeter to make a four-wire resistance measurement.

2 Assemble the test cables.

a Use the two BNC-to-banana adapters to connect one end of each BNC cable to the four-

wire resistance connections on the multimeter.

b Connect the free ends of the cables to the BNC tee.

See figure 3-3.

To ohmmeter 4-wire inputs

To oscilloscope channel input

Input Resistance Equipment Setup

3 Connect the male end of the BNC tee to the channel 1 input of the oscilloscope. 4 Press Default Setup to set the oscilloscope to default conditions. 5 Press the Input key for Channel 1 to select 1 MΩ, then 50Ω, and verify resistance

readings of 1 M

Ω ±10 kΩ and 50 Ω ±0.75 Ω respectively.

6 Record the readings in the Performance Test Record. 7 Repeat steps 3 through 6 on the remaining channels.

3–6

Chapter 3: Testing Performance

To test voltage measurement accuracy

T h is t e s t v e r i fi e s t he v ol ta g e m e as u r e me n t a c c u ra c y o f t h e i n s t ru m e n t. T he m e a su r em e n t is m a d e using dual-cursor automatic measurement so that offset errors are not a factor.

A power supply provides a reference voltage to check voltage measurement accuracy. The actual supply voltage is monitored for accuracy using a NIST-traceable voltmeter. A dc blocking capacitor and a BNC short are used to filter any noise generated by the power supply (especially at low voltages) so it does not appear at the oscilloscope input.

Specification

Only the dual-cursor specification is tested.

Single Cursor Measurement: Dual Cursor Measurement: Gain Accuracy

: ± 1.00% of full scale at full-resolution channel scale

Resolution: 8 bits, (0.4% of full scale without averaging); or

12 bits, (0.024% of full scale with 32 averages) at ful-resolution scale

Offset Accuracy

: ±(1.00% of channel offset + 1% of full scale) at full-resolution scale

±(gain accuracy + offset accuracy + resolution/2)

±(gain accuracy + resolution)

Equipment Required

Equipment Critical Specifications Recommended Model/Part

Power Supply 7 mV to 30 Vdc, 0.1 mV resolution Agilent 6114A

Digital Multimeter (DVM)

Cables (2) BNC Agilent 10503A

Adapters (2) BNC (f) to banana (m) Agilent 1251-2277

Adapters (2) BNC tee (m)(f)(f) Agilent 1250-0781

Blocking capacitor 0.18

Shorting cap BNC Agilent 1250-0774

Better than 0.1% accuracy Agilent 34401A

µF Agilent 10240B

Procedure

Connect the equipment.

See figure 3-4.

a Use a BNC-to-banana adapter to connect a BNC cable to the power supply.

b Connect a BNC tee to the other end of the cable and connect the tee to channel 1 of the

oscilloscope.

c Connect another BNC cable to the tee at the oscilloscope and connect a BNC tee to the

other end of the cable.

d Connect the blocking capacitor to the BNC tee and connect the BNC short to the blocking

capacitor.

e Connect a BNC-to-banana adapter to the same BNC tee and connect the adapter to the

DVM input.

3–7

Figure 3-4

Chapter 3: Testing Performance

To test voltage measurement accuracy

Voltage Measurement Accuracy Equipment Setup

2 Press Default Setup to set the oscilloscope to default conditions. 3 Set all channels to dc using the Coupling key and to 1 MΩ input impedance using the

Input key.

4 Using the mouse, enable the graphical interface. 5 Select Acquisition from the Setup menu. 6 Select Equivalent Time sampling mode. Enable Averaging. Set the # of Averages to 32,

either using the spin box or the numeric keypad dialog. Click Close.

See figure 3-5.

Figure 3-5

Select Equivalent Time sampling mode

Leave Memory Depth on Automatic

Enable averaging

Set the number of averages to 32

Acquisition Setup for Voltage Accuracy Measurement

7 Use the following table for steps 8 through 15.

3–8

To test voltage measurement accuracy

Scale Offset Supply Tolerance Limits

2 V/div* 2.5 V 5 V ±163.8 V 4.836 V to 5.164 V

Chapter 3: Testing Performance

Figure 3-6

1 V/div 2.5 V 5 V

500 mV 1.75 V 3.5 V

200 mV 700 mV 1.4 V

100 mV 350 mV 700 mV

50 mV 175 mV 350 mV

20 mV 70 mV 140 mV

10 mV 35 mV 70 mV

* only in 1 M

Ω input

±82 mV 4.918 to 5.082 V

±41 mV 3.459 to 3.541 V

±16.4 mV 1.384 to 1.416 V

±8.2 mV 691.8 mV to 708.2 mV

±4.1 mV 345.9 mV to 354.1 mV

±1.64 mV 138.36 mV to 141.64 mV

±0.819 mV 69.18 mV to 70.82 mV

Below 10 mV/div expansion is used and full scale is defined as 80 mV. The ranges from 2 to 9 mV/div are handled in firmware, and will be within specifications when the 10 mV/div range is within specifications.

Select Vavg from the Voltage submenu of the Measure menu. Ensure that Channel 1 is

selected in the Source dialog and click Close.

See figure 3-6.

Select Channel 1 as the source for the Vavg measurement

Source Selection for Vavg Measurement

9 Select Channel 1 from the Setup menu.

10 Set the vertical scaling for Channel 1 to the volts/div value from the first row of the

table in step 7. Set the Offset value to the Position value from the first row of the same table. Click Close.

See figure 3-7.

3–9

Figure 3-7

Set the scale from the table

Set the offset from the table

Chapter 3: Testing Performance

To test voltage measurement accuracy

Vertical Scaling and Offset for Voltage Accuracy Measurement

To Set Vertical Scale and Position

You can also use the knobs to set the vertical scale and position, but it is usually easier to use the dialog box, particularly for the fine position setting.

11 With the supply disconnected from the channel input, note the V

mean reading.

avg

____________ V

It may take a moment for this value to settle because of averaging.

12 Set the power supply voltage from the first line of the table. Use the voltmeter to adjust

the power supply for the most accurate output.

13 Connect the power supply to the channel input and note the V

Press Clear Display and wait a moment to read the value (so that averaging is complete).

Subtract the value in step 11 from the value in step 13. Record the difference in the

reading. _________ V

avg

Performance Test Record.

15 On the same channel, repeat steps 10 through 14 for the rest of the rows in the table. 16 With the channel keys, set the active channel OFF and the next ON.

A channel is ON if its key is illuminated and OFF if it is not illuminated.

Move the BNC tee to the next channel and repeat steps 8 through 15 for that channel.

18 Repeat steps 8 through 17 for the rest of the channels. 19 Repeat steps 3 through 18 for the 50Ω input.

If the test fails

Voltage measurement errors can be caused by the need for self-calibration. Before troubleshooting the instrument, perform self-calibration. See “To run the self-calibration” in chapter 4, “Calibrating and Adjusting.” If self-calibration fails to correct the problem, the cause may be the attenuator or main assembly.

3–10

To test offset accuracy

This test checks the vertical offset accuracy.

Chapter 3: Testing Performance

To test offset accuracy

Specification:

±(1.00% of channel offset + 1% of full scale) at full-resolution channel scale

Equipment Required

Equipment Critical Specifications Recommended Model/Part

Power Supply 0.5 V to 2 Vdc, ±1 mV accuracy Agilent 6114A

Digital Multimeter (DVM)

Cables (2) BNC Agilent 10503A

Adapters (2) BNC (f) to banana (m) Agilent 1251-2277

Adapters (2) BNC tee (m)(f)(f) Agilent 1250-0781

Blocking capacitor 0.18

Shorting cap BNC Agilent 1250-0774

Better than 0.1% accuracy Agilent 34401A

µF Agilent 10240B

Procedure

Connect the equipment.

The cabling is the same as that used for the voltage measurement accuracy test. See figure 3-4.

a Use a BNC-to-banana adapter to connect a BNC cable to the power supply.

b Connect a BNC tee to the other end of the cable and connect the tee to channel 1 of the

oscilloscope.

c Connect another BNC cable to the tee at the oscilloscope and connect a BNC tee to the

other end of the cable.

d Connect the blocking capacitor to the BNC tee and connect the BNC short to the blocking

capacitor.

e Connect a BNC-to-banana adapter to the same BNC tee and connect the adapter to the

DVM input.

Press Default Setup to set the oscilloscope to default conditions.

3 Select Acquisition from the Setup menu. 4 Select Equivalent Time under Sampling Mode. Enable Averaging, and set the # Points

for averaging to 32. Click Close.

Setup is the same as that for the voltage measurement accuracy test. See figure 3-5.

5 Use the following table for steps 6 through 12.

Volts/div Position Supply Tolerance Limits

minimum maximum

200 mV 2.00000 V 2.00 V ±36 mV 1.964 V 2.036 V

100 mV 1.00000 V 1.00 V

50 mV 500.000 mV 500 mV

±18 mV 0.982 V 1.018 V

±9 mV 491 mV 509 mV

6 Select Channel 1 from the Setup menu. 7 Set th e verti c al Scale to the Volt s/div va l ue from th e first ro w of the ta b le. Set th e Offset

to the Position value from the first row of the table. Click Close.

3–11

Chapter 3: Testing Performance

To test offset accuracy

Set the supply voltage to 2.00 V as in the first row of the table. Use the DVM to verify

the setting.

9 Re-adjust the vertical position, if necessary, so the trace is as close to the horizontal

center line of the grid as possible after it has settled (averaging complete).

10 Read the position voltage. It should be equal to the DVM reading, within the limits given

in the table. Record the reading in the Performance Test Record.

To find the current position setting, select Channel 1 from the Setup menu and read the Offset field. Click Close when finished.

Repeat steps 6 through 10 for the other lines in the table.

11 12 With the channel keys, set the active channel OFF and the next ON. 13 Move the BNC from one channel to the next. 14 Repeat steps 6 through 13 for each channel, setting the parameters of the channel being

tested where appropriate.

If the test fails

Offset errors can be caused by the need for self-calibration. Perform self-calibration (see chapter 4, “Calibrating and Adjusting”) before troubleshooting the instrument.

3–12

Chapter 3: Testing Performance

To test bandwidth

This test checks the bandwidth of the oscilloscope. The Agilent 54845A bandwidth at 1.5 GHz and the Agilent 54846A bandwidth at 2.25 GHz oscilloscopes are checked using aliasing since the trigger specification of these oscilloscopes is 1 GHz. The 1.5 GHz or the 2.25 GHz signal is viewed with a time/division setting of approximately 50 untriggered sinewave that appears to be at a lower frequency, however the vertical response of the amplifiers is correct. The Agilent 54835A bandwidth at 1.0 GHz and 500 MHz of all three models is checked normally.

Specification

Equivalent Time:

Ω: 2.25 GHz (Agilent 54846A), 1.5 GHz (Agilent 54845A), 1.0 GHz (Agilent 54835A)

Ω: 500 MHz (with Agilent 1161A probe)

1 M

Real Time: 50

Ω: for Agilent 54846A — 2.25 GHz (2-channel mode), 1.0 GHz (4-channel mode) Ω: for Agilent 54845A — 1.5 GHz (2-channel mode), 1.0 GHz (4-channel mode)

50 50

Ω: for Agilent 54835A — 1.0 GHz (2-channel mode), 500 MHz (4-channel mode)

1 M

Ω: 500 MHz (with Agilent 1161A probe)

µs/div where the on-screen display is an

Equipment Required

Equipment Critical Specifications Recommended Model/Part

Signal Generator 10—2250 MHz at ≈200 mVrms Agilent 8664A

Power Meter/Sensor 1—1.5 GHz ±3% accuracy Agilent EPM-441A/8482A

Power Splitter outputs differ by <0.15 dB Agilent 11667A

Cable Type N (m) 24 inch Agilent 11500B

Termination 50Ω, BNC Connectors Agilent 10100C

Adapter Type N (m) to BNC (m) Agilent 1250-0082

Probe No Substitute Agilent 1161A

Probe Tip Adapter 1160 Series to BNC Agilent 5063-2143

Equivalent Time Test

Connect the equipment.

a With the N cable, connect the signal generator to the power splitter input. Connect the

power sensor to one output of the power splitter.

b With an N-to-BNC adapter, connect the other splitter output to the channel 1 input.

Press Default Setup to set the oscilloscope to default conditions.

3 Select Acquisition from the Setup menu. Select Equivalent Time sampling mode. Click

Close. Select Display from the Setup Menu. Unselect Connect Dots mode. Click Close.

4 Set the vertical scale for Channel 1 to 100 mV/div using the knob. Select 50Ω input

impedance.

5 Set the sweep speed to 50 ns/div using the horizontal sweep speed knob. 6 Set the signal generator for 10 MHz at +5.0 dBm.

The signal on the oscilloscope screen should be about five cycles at six divisions amplitude.

Bandwidth Check Limits

Do not exceed 6 divisions when making the bandwidth check.

3–13

Chapter 3: Testing Performance

To test bandwidth

Select V

7 8 Note the V 9 Set the power meter Cal Factor % to the 10 MHz value from the calibration chart on

from the Voltage submenu of the Measure menu.

amptd

amptd (1)

reading at the bottom of the screen. V

=_______________mV.

10MHz

the power sensor. Then press dB[REF] on the power meter to set a 0 dB reference.

This establishes the baseline output power at 10 MHz as a reference for the bandwidth measurement.

Change the signal generator output frequency to 1000 MHz for Agilent 54835A, 1500 MHz for Agilent 54845A, or 2250 MHz for Agilent 54846A. Set the power meter chart Cal Factor % to the 2250 MHz value, to the 1500 MHz value, or to the 1000 MHz value depending on the model number.

This step compensates the power meter reading for changes in the power sensor output at 1000 MHz, 1500 MHz, or 2250 MHz with respect to 10 MHz.

Adjust the signal generator output amplitude for a power reading as close as possible

to 0.0 dB[REL]. Write down the actual reading. Reading = ______ dB [REL].

The reading on the power meter will be used to correct the final bandwidth value.

Use one of the following steps depending on the Infiniium oscilloscope model being tested and the bandwidth acquisition mode:

a (Use this step for model 54835A 1000 MHz Equivalent Time bandwidth check.)

Set the sweep speed to 500 ps/div using the Horizontal sweep speed knob.

b (Use this step for model 54845A 1500 MHz Equivalent Time bandwidth check.)

Set the sweep speed to 50

c (Use this step for model 54846A 2250 MHz Equivalent Time bandwidth check.)

Set the sweep speed to 50

d (Use this step for Real Time bandwidth checks: 1000 MHz on 54835A, 1500 MHz on

54845A, or 2250 MHz on 54836A) Set the sweep speed to 500 ps/div using the Horizontal sweep speed knob.

e (Use this step for 1 M

Set the sweep speed to 1 ns/div using the Horizontal sweep speed knob.

Press the Clear Display key followed by the Run key to display a trace. (It there is no

µs/div using the Horizontal sweep speed knob.

Ω, 500 MHz bandwidth check for all three models.)

trace on the screen slowly adjust the Trigger Level knob through zero until a trace is displayed.) Note the V V

2250MHz

1500MHz

1000MHz

14 Calculate the response using the formula:

= _______________ mV (54846A) = _______________ mV (54845A) = _______________ mV (54835A)

amptd(1)

response dB() 20log

For example:

reading.

1500 MHz

------------------------

10 MHz

20log10________=_______dB==

487 mV

20log

Correct the result from step 14 with any difference in the power meter from step 11.

-------------------

559 mV

20log100.871 1.19dB–==

Observe signs. For example:

Result from step 14 = -1.19 dB

Power meter reading =

then true response = (

(__________)

16 The result from step 15 should be between +3.0 dB and −3.0 dB. Record the result in

− (__________) = _________dB

−0.5 dB(REL)

−1.19)−(−0.5) = −0.69 dB

the Test Record.

17 Switch the power splitter from the channel 1 to the channel 2 input. 18 Turn off the current channel and turn on the next channel using the channel keys.

3–14

Chapter 3: Testing Performance

To test bandwidth

Repeat steps 4 through 18 for the remaining channels, setting the parameters of the

channel being tested where appropriate.

Real Time Test

20 Select Acquisition from the Setup menu. 21 Select Real Time sampling mode, 8 GSa/s (Agilent 54845A and 54846A) or 4 GSa/s

(Agilent 54835A) configuration, then click Close.

22 Repeat steps 4 through 19, testing channels 1 and 3 to the 2.25 GHz limit (54846A), 1.5

GHz limit (Agilent 54845A), or the 1.0 GHz limit (Agilent 54835A).

23 Select Acquisition from the Setup menu. 24 Select the 4 GSa/s configuration (Agilent 54845A and 54846A) or 2 GSa/s configuration

(Agilent 54835A), then click Close.

25 Repeat steps 4 through 19, testing channels 1, 2, 3, and 4 to the 1 GHz limit (Agilent

54845A and 54846A) or the 500 MHz limit (Agilent 54835A).

1 MΩ, 500 MHz Test on 54835A, 54845A, and 54846A

26 Disconnect the power splitter from the channel input. 27 Select Acquisition from the Setup menu. 28 Select Equivalent time Sampling Mode and click Close. 29 Connect the Agilent 1161A 10:1 probe to channel 1. Verify that the probe compensation

is correct.

30 Change channel to 100 mV/div using the knob. 31 Connect the probe tip to the power splitter using the probe-tip-to-BNC adapter and 50Ω

termination.

32 Repeat steps 5 through 19, testing the 500 MHz limit on channels 1, 2, 3, and 4.

If the test fails

Failure of the bandwidth test can be caused by a faulty attenuator or main assembly. A self calibration may correct a bandwidth failure.

3–15

Chapter 3: Testing Performance

To test time measurement accuracy

This test uses a precise frequency source to check the accuracy of time measurement functions.

Specification Delta-t accuracy

Equivalent Time: (

≥16 averages)

±[(0.007% × delta-t) + (full scale/(2 × memory depth))+ 30 ps]

Real Time: *

* The specification applies to bandwidth limited signals (tr

±[(0.007% × delta-t) + (0.2 × sample period)]

≥ 1.4 × sample period).

The sample period is defined as 1/(sample rate). The specification also applies to those automatic measurements computing time intervals on identical slope edges (like pos-pos, neg-neg).

Equipment Required

Equipment Critical Specifications Recommended Model/Part

Signal Generator 1-100 MHz,

timebase accuracy - 0.25 ppm

RF Amplifier 40 MHz to 1 GHz, 20 dB gain Agilent 8447D

Cable Type-N 24 inch Agilent 11500B

Cable BNC Agilent 10503A

Adapter Type N (f) to BNC (m) Agilent 1250-0077

Agilent 8664A

The Agilent 8447D RF Amplifier is used as a saturation amplifier to create a very low-jitter squarewave from the sinewave output of the signal generator. You adjust the signal generator output level to change the risetime of the squarewave.

Equivalent Time Mode Procedure

This test checks time measurement in equivalent time mode with averaging.

Set the Agilent 8664A signal generator for a 40-MHz sine wave (25.0 ns period) at 250 mV

rms

2 Connect the output of the signal generator to the INPUT of the Agilent 8447D RF

amplifier.

3 Connect the OUTPUT of the RF amplifier to the channel 1 input of the oscilloscope. 4 Press Default Setup to set the oscilloscope to default conditions. 5 Press Input to select 50 Ω. Press Coupling to select dc. 6 Press Autoscale. 7 Set the vertical scale to 500 mV per division.

3–16

Figure 3-8

Chapter 3: Testing Performance

To test time measurement accuracy

Select horizontal from the setup mean. Set the scale to 5 ns/div, position at –5 ns, and

reference to the left.

Horizontal Setup for Equivalent Time Procedure

9 Adjust the signal generator output voltage to obtain a waveform with a risetime of

approximately 700 ps to 1.4 ns.

You can measure the risetime by selecting the Risetime command from the Time submenu of the Measure menu. See figure 3-9.

Figure 3-9

Use the risetime measurement to verify correct waveform shape for the time measurement accuracy check

Waveform for Time Measurement Accuracy Check

10 Select Acquisition from the Setup menu.

3–17

Figure 3-10

Chapter 3: Testing Performance

To test time measurement accuracy

Select Equivalent Time sampling mode. Enable Averaging and set the # Points to be

averaged to 16. Select Manual Memory Depth. Set the memory depth to 2004 points. Click Close.

See figure 3-10.

Acquisition Setup for Equivalent Time Procedure

12 Select Delta Time from the Time submenu of the Measure menu. Select Channel 1 as

the source in the dialog that appears and click Close.

See figure 3-11.

Figure 3-11

Source Selection for Delta Time Measurement

13 Select Measurement Definitions from the Customize submenu of the Measure menu.

(If you have code Revision A.03.00 or higher, select Delta Time from the Measurements Definitions submenu of the Measure menu.)

14 Set From Edge # to 1 with Direction Rising and Threshold Middle. Set To Edge # to 2

with Direction Rising and Threshold Middle. Click Close.

See figure 3-12.

3–18

Figure 3-12

Chapter 3: Testing Performance

To test time measurement accuracy

Measurement Settings for Time Interval Measurement

For valid statistical data

In equivalent time mode, measurement specifications are valid with sixteen or more acquisitions averaged. Statistics accumulated before the required number of averaged acquisitions may show the instrument to fail the specification. This is particularly true for minimum and maximum in this case since they are set by measurements taken with the fewest averages.

If the procedure above is followed exactly, the required number of acquisitions are averaged before statistics are turned on. Therefore, if you clear and restart measurements, averaging and statistics are restarted simultaneously and the result is erroneous data collected from the early averages.

If in doubt about the statistical data, after #Avg is complete select Clear Measurements or Clear All from the Measure menu tool bar, then repeat the custom measurement again. This restarts the statistics without restarting averaging and the result is valid statistical data.

15 Verify the period is 25 ns ± 44 ps, minimum 24.956 ns and maximum 25.044 ns. Record

the minimum and maximum readings in the Performance Test Record.

16 Change the signal generator frequency to 100 MHz (10 ns period). 17 Select horizontal from the setup menu. Set the position to –11 ns. 18 Clear measurement statistics.

Do this by clicking Clear Meas (Clear All) on the measurement toolbar, then selecting Delta time from the Time submenu of the measure menu.

The delta time reading should be 10 ns ± 43 ps, minimum 9.957 ns and

maximum 10.043 ns. Record the minimum and maximum readings in the Performance Test Record.

20 Change the signal generator frequency to 20 MHz (50 ns period). 21 Select horizontal from the setup menu. Set the scale to 100 ns/div, position to –11 ns. 22 Clear measurement statistics as in step 18 and restart the measurement. 23 The delta time reading should be 50 ns ± 283 ps; minimum 49.72 ns and maximum

50.28 ns. Record the minimum and maximum readings in the Performance Test Record.

24 Change the signal generator frequency to 1 MHz (1 µs period). 25 Select horizontal from the setup menu. Set the scale to 1 µs/div, position to –11 ns.

3–19

Figure 3-13

Chapter 3: Testing Performance

To test time measurement accuracy

Clear measurement statistics as in step 18 and restart the measurement.

26 27 The delta time reading should be 1 µs ± 2.595 ns, minimum 997.4 ns and maximum

1.0026

µs. Record the minimum and maximum readings in the Performance Test

Record.

28 Select Measurement Definitions from the Customize submenu of the Measure menu.

(If you have code Revision A.03.00 or higher, select Delta Time from the Measurements Definitions submenu of the Measure menu.)

29 Set the To Edge # to 6 with Direction Rising and Threshold Middle. Click Close.

See figure 3-13.

New Measurement Settings for Delta Time Measurement

30 Clear measurement statistics as in step 18 and restart the measurement. 31 The delta time readings should be 5 µs ± 2.875 ns, minimum 4.9971 µs and maximum

5.0029

µs. Record the minimum and maximum readings in the Performance Test

Record.

3–20

Figure 3-14

Chapter 3: Testing Performance

To test time measurement accuracy

Real-Time Mode Procedure

This procedure continues from the previous one.

Change the signal generator frequency to 25.31646 MHz (39.49999 ns period).

1 2 Select Acquisition from the Setup menu. 3 Select Real Time sampling mode. Set Configuration to 8 GSa/s (Agilent 54845A) or

4 GSa/s (Agilent 54835A). Set Sampling Rate to Manual, 8 GSa/s (Agilent 54845A) or 4 GSa/s (Agilent 54835A). Enable Averaging with the number of points set to 16. Set Memory Depth to Automatic. Click Close.

See figure 3-14.

Figure 3-15

Acquisition Setup for Real Mode Procedure (showing Agilent 54845A)

4 Set sweep speed to 50 ns/div with horizontal position at 0.0 s. 5 Select Measurement Definitions from the Customize submenu of the Measure menu.

(If you have code Revision A.03.00 or higher, select Delta Time from the Measurements Definitions submenu of the Measure menu.)

6 Set To Edge # to 11 with Direction Rising and Threshold Middle. Click Close.

See figure 3-15.

Measurement Definitions for Real Mode Procedure

3–21

Chapter 3: Testing Performance

To test time measurement accuracy

Clear measurements.

7 8 Select Period from the Time submenu of the Measure menu. 9 Period should be the following.

For Agilent 54835A: 39.50 ns ± 53 ps, minimum 39.447 ns, maximum 39.553 ns. Record the minimum and maximum readings in the Performance Test Record. For Agilent 54845A: 39.50 ns minimum and maximum readings in the Performance Test Record.

Select Delta Time from the Time submenu of the Measure menu.

11 Delta time should read the following:

For Agilent 54835A: 395 ns ± 78 ps, minimum 394.922 ns, maximum 395.078 ns. Record the minimum and maximum readings in the Performance Test Record. For Agilent 54845A: 395 ns the minimum and maximum readings in the Performance Test Record.

Press the Stop key on the front panel.

13 Press the Sweep key (in the Trigger section of the front panel) to highlight the LED

± 28 ps, minimum 39.47 ns, maximum 39.53 ns. Record the

± 53 ps, minimum 394.947 ns, maximum 395.053 ns. Record

labeled “Single.”

14 Press the Clear Display key. 15 Set the timebase to 1 µs/div. 16 Press the Run key once. 17 Select Measurement Definitions from the Customize submenu of the Measure menu.

(If you have code Revision A.03.00 or higher, select Delta Time from the Measurements Definitions submenu of the Measure menu.)

18 Set the To Edge # to 101 with Direction Rising and Threshold Middle. Click Close. 19 Delta time mean should read the following:

For Agilent 54835A: 3.949999 µs ± 326 ps, minimum 3.949673 µs, maximum 3.950326

µs. Record the reading in the Performance Test Record.

For Agilent 54845A: 3.94999 Record the reading in the Performance Test Record.

Select Measurement Definitions from the Customize submenu of the Measure menu.

µs ± 301 ps, minimum 3.949688 µs, maximum 3.950291 µs.

(If you have code Revision A.03.00 or higher, select Delta Time from the Measurements Definitions submenu of the Measure menu.)

21 Set the To Edge # to 201. Click Close. 22 The Delta Time mean should read the following:

For Agilent 54835A: 7.89999 µs ± 603 ps, minimum 7.899395 µs and maximum 7.90060

µs. Record the reading in the Performance Test Record.

For Agilent 54845A: 7.89999

µs. Record the reading in the Performance Test Record.

Click Close.

µs ± 578 ps, minimum 7.89942 µs and maximum 7.90058

If the test fails

Before troubleshooting the oscilloscope, be sure to verify your test setup and the waveform shape, then repeat the procedure. Try the measurement on different channels. If you still encounter problems, there may be a problem with the acquisition board. You may need to adjust the pulse overshoot response. See chapter 4 for adjustment information on the pulse response. See chapter 5 for troubleshooting information.

3–22

Chapter 3: Testing Performance

To test trigger sensitivity

This test checks channel and external triggers for sensitivity at rated bandwidth.

Specification

Internal:

Auxiliary:

dc to 500 MHz: 0.5 div

100 MHz to 500 MHz: 1.0 div

500 MHz to 1 GHz: 1.5 div

dc to 500 MHz: 300 mV

Equipment Required

Equipment Critical Specifications Recommended Model/Part

Signal Generator 100 and 500 MHz, 1.0 GHz, 30-80 mVrms output Agilent 8664A

Power Splitter outputs differ by <0.15 dB Agilent 11667A

Termination BNC feedthrough, 50 Ω Agilent 10100C

Cable Type N (m) 24 inch Agilent 11500B

Cable 50 Ω BNC 36 inch Agilent 10503A

Adapter Type N (f) to BNC (m) Agilent 1250-0077

Adapter Type N (m) to BNC (m) Agilent 1250-0082

Adapter Type N (m) to BNC (f) Agilent 1250-0780

Adapter BNC tee (m)(f)(f) Agilent 1250-0781

Internal Trigger Test

Perform this test on all vertical channels.

Press Default Setup.

2 Select Acquisition from the Setup menu. 3 Select Equivalent time sampling mode. Enable Averaging and set the number of points

to 4. Click Close.

See figure 3-16.

Figure 3-16

Acquisition Setup for Trigger Sensitivity Test

4 Set horizontal time/div to 5 ns/div.

3–23

Figure 3-17

Chapter 3: Testing Performance

To test trigger sensitivity

Turn on Channel 1 and turn off all other channels.

You can do this by using the channel keys above each input BNC or by using the check boxes at the top of the waveform display area.

Set vertical scale for channel 1 to 200 mV/div. Select dc coupling and 50Ω input impedance.

7 With an N cable and N-to-BNC adapter, connect the signal generator to the channel 1

input.

8 Set the signal frequency to 100 MHz and output level for 0.5 divisions of vertical

deflection.

You can use the markers to set a 0.5 division reference. Select Markers from the Measure menu and select Manual Placement in the dialog that appears. Both Markers should be set to the same channel. Set the Y value for Marker A to +50.0 mV and the Y value for Marker B to –50.0 mV, then click Close. (If the markers do not appear on the screen, press the Marker A and Marker B keys on the front panel.) See figure 3-17.

Setting the Markers for a 0.5 Division Reference

9 Press the Sweep key (Trigger section of the front panel controls) to select Trig’d.

The scope’s Armed and Trig’d LEDs (in the Horizontal section of the front panel) should flash. However, the waveform display may not be stable.

Adjust the trigger level control for a stable display.

11 The test passes if triggering is stable. Record the result in the Performance Test Record. 12 Set the signal frequency to 500 MHz and the output level for 1 division of vertical

deflection.

Again, you can use the markers to check the deflection, with one set to +100 mV and the other to –100 mV.

Adjust the horizontal sweep speed to 1 ns/div.

14 Adjust the trigger level for a stable display. 15 The test passes if triggering is stable. Record the result in the Performance Test Record. 16 Set the signal frequency to 1.0 GHz and the output level for 1.5 division of vertical

deflection.

Again, you can use the markers to check the deflection, with one set to +150 mV and the other to –150 mV.

3–24

Chapter 3: Testing Performance

To test trigger sensitivity

Adjust the horizontal sweep speed to 1 ns/div.

17 18 Adjust the trigger level for a stable display. 19 The test passes if triggering is stable. Record the result in the Performance Test Record. 20 Connect the signal generator to the channel 2 input. 21 Repeat steps 4 through 20 for the remaining channels.

Procedure—Auxiliary Trigger Test

The auxiliary trigger input is on the front panel of the oscilloscope near the vertical inputs. The dc input resistance of the aux trigger is 2.58k terminated with 50

1 With an N-to-BNC adapter and BNC cable, connect the signal generator to the input of

Ω.

Ω, so to a v o id reflect ions, the tr igger sourc e is b ack-

the power splitter. Connect one output of the power splitter to the Aux Trig input through a 50

Ω feedthrough termination. Connect the other output of the power splitter

to channel 1.

2 Set the signal generator for 500 MHz, approximately 0 dBm. 3 Set the channel 1 input to 50-Ω input impedance and press Autoscale. 4 Set the channel 1 scaling to 50 mV/div. Then set the signal generator for 6 divisions of

signal (300 mV

5 Press the Source key (Trigger section of front panel) to highlight Aux. 6 Set the trigger level to 0.000 V. 7 Slowly adjust the Trigger Level knob slightly around the 0 V setting to obtain a stable

trigger. Otherwise, the test fails. Record the result in the Performance Test Record.

If a test fails

Failure of the internal trigger or external trigger sensitivity tests can be caused by a defective main assembly or attenuator. Failure of the auxiliary trigger sensitivity is caused by a problem on the main assembly or a bad input cable. If you need further troubleshooting information, go to chapter 5, “Troubleshooting.”

3–25

3–26

Performance Test Record

Agilent Technologies

Model Number _____________________ Tested by___________________

Serial Number ___________________________ Work Order No.___________________

Recommended Test Interval - 1 Year/2000 hours Date___________________

Recommended next testing___________________ Ambient temperature ___________________

Test Limits Results

(Vmax - Vmin)/5 = Limits

dc Calibrator Amplitude

Input Resistance

Voltage Measurement Accuracy

1.000 0.998 to 1.002 ___________________

Ω 49.25 Ω to 50.75 Ω ___________ ___________ ___________ ___________

1 MΩ 990 kΩ to 1.010 MΩ ___________ ___________ ___________ ___________

Scale Coupling Supply Limits Channel 1 Channel 2 Channel 3 Channel 4

2 V/div 1 MΩ 5 V 4.836 V to 5.164 V ___________ ___________ ___________ ___________

1 V/div 1 MΩ 5 V 4.918 V to 5.082 V ___________ ___________ ___________ ___________

Agilent Technologies 54835A/45A/46A Oscilloscope

Channel 1 Channel 2 Channel 3 Chan 4/Ext

Offset Accuracy

1 V/div 50Ω 5 V 4.918 V to 5.082 V ___________ ___________ ___________ ___________

500 mV/div 1 MΩ 3.5 V 3.459 V to 3.541 V ___________ ___________ ___________ ___________

500 mV/div 50Ω 3.5 V 3.459 V to 3.541 V ___________ ___________ ___________ ___________

200 mV/div 1 MΩ 1.4 V 1.384 V to 1.416 V ___________ ___________ ___________ ___________

200 mV/div 50Ω 1.4 V 1.384 V to 1.416 V ___________ ___________ ___________ ___________

100 mV/div 1 MΩ 700 mV 691.8 mV to 708.2 mV ___________ ___________ ___________ ___________

100 mV/div 50Ω 700 mV 691.8 mV to 708.2 mV ___________ ___________ ___________ ___________

50 mV/div 1 MΩ 350 mV 345.9 mV to 354.1 mV ___________ ___________ ___________ ___________

50 mV/div 50Ω 350 mV 345.9 mV to 354.1 mV ___________ ___________ ___________ ___________

20 mV/div 1 MΩ 140 mV 138.36 mV to 141.64 mV ___________ ___________ ___________ ___________

20 mV/div 50Ω 140 mV 138.36 mV to 141.64 mV ___________ ___________ ___________ ___________

10 mV/div 1 MΩ 70 mV 69.18 mV to 70.82 mV ___________ ___________ ___________ ___________

10 mV/div 50Ω 70 mV 69.18 mV to 70.82 mV ___________ ___________ ___________ ___________

Range Offset Limits Channel 1 Channel 2 Channel 3 Channel 4

200 mV/div 2.0 V 1.964 to 2.036 V ___________ ___________ ___________ ___________

100 mV/div 1.0 V 0.982 to 1.018 V ___________ ___________ ___________ ___________

50 mV/div 500 mV 491 to 509 mV ___________ ___________ ___________ ___________

3–27

Test Limits Results

Bandwidth (50Ω Input)

Bandwidth

Ω

(1 M Input)

Time measurement accuracy— equivalent time mode

Down from reference: Channel 1 Channel 2 Channel 3 Channel 4

Equivalent Time Agilent 54835A <3.0 dB at 1000 MHz

Realtime

2 channel (4 GSa/s) 2 channel (8 GSa/s) 2 channel (8 GSa/s)

4 channel (2 GSa/s) 4 channel (4 GSa/s) 4 channel (4 GSa/s)

With 1161A Probe <3.0 dB at 500 MHz ___________ ___________ ___________ ___________

∆Time Limits Minimum Maximum

25 ns 24.946 to 25.044 ns __________________ __________________

10 ns 9.957 to 10.043 ns __________________ __________________

50 ns 49.72 to 50.28 ns __________________ __________________

1 µs 997.4 to 1.0026 µs __________________ __________________

Agilent 54845A <3.0 dB at 1500 MHz Agilent 54846A <3.0 dB at 2250 MHz

Agilent 54835A <3.0 dB at 1000 MHz Agilent 54845A <3.0 dB at 1500 MHz Agilent 54846A <3.0 dB at 2250 MHz

Agilent 54835A <3.0 dB at 500 MHz Agilent 54845A <3.0 dB at 1000 MHz Agilent 54846A <3.0 dB at 1000 MHz

Down from reference: Channel 1 Channel 2 Channel 3 Channel 4

___________ ___________ ___________ ___________

___________ ___________

___________ ___________ ___________ ___________

Time measurement accuracy— real time mode

Trigger Sensitivity

5 µs 4.9971 to 5.0029 µs __________________ __________________

Period Limits Minimum Maximum

Agilent 54835A: 39.50 ns ± 53 ps Agilent 54845A/46A: 39.50 ns ± 28 ps

∆Time (edge#11) Limits

Agilent 54835A: 395 ns ± 78 ps Agilent 54845A/46A: 395 ns ± 53 ps

∆Time (edge#101) Limits

Agilent 54835A: 3.949999 µs ± 326 ps Agilent 54845A: 3.949999 µs ± 301 ps Agilent 54846A: 3.949999 µs ± 301 ps

∆Time (edge#201) Limits

Agilent 54835A: 7.89999 µs ± 603 ps Agilent 54845A: 7.89999 µs ± 578 ps Agilent 54846A: 7.89999 µs ± 578 ps

Mode Stable Trigger On: Pass/Fail

Internal Trigger 0.5 div at 100 MHz ___________ ___________ ___________ ___________

39.447 to 39.553 ns

39.47 to 39.53 ns

394.922 to 395.078 ns

394.947 to 395.053 ns

3.949673 to 3.950326 µs

3.949688 to 3.950291 µs

7.899395 to 7.90060 µs

7.89942 to 7.90058 µs

1.0 div at 500 MHz ___________ ___________ ___________ ___________

__________________ __________________

Channel 1 Channel 2 Channel 3 Channel 4

1.5 div at 1.0 GHz ___________ ___________ ___________ ___________

Auxiliary Trigger 300 mV

3–28

at 500 MHz ___________ ___________ ___________ ___________

Equipment Required 4-2 Self Calibration Interval and Hardware Adjustments 4-2 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

Calibrating and Adjusting

This chapter provides firmware (self calibration) and hardware adjustment procedures for the Agilent Technologies 54835A/45A/46A oscilloscope.

• Power Supply Check

• Oscillator Check

• Flat-Panel Display Check

• self calibration

Equipment Required

Equipment required for adjustments is listed in the Recommended Test Equipment table in chapter 1 of this manual. Any equipment that satisfies the critical specification listed in the table may be substituted for the recommended model. Equipment for individual procedures is listed at the procedure.

Self Calibration Interval and Hardware Adjustments

Th e f i rm ware calibration is t h e s e lf cal (self calib ra t i o n ). Self calibratio n s h ould be done every year, or every 2,000 hours of operation, whichever comes first. The hardware adjustment consists of checking the power supply, 715 Hz calibration output (probe compensation squarewave), and flat-panel display. These adjustments only need to be done under circumstances set by certain needs, which are explained in other areas of this guide.

The self calibration uses signals generated in the oscilloscope to calibrate channel sensitivity, offsets, and trigger parameters. You should run the self calibration

• yearly, or according to your periodic needs,

• when you adjust or replace the acquisition assembly or acquisition hybrids,

• when you replace the hard drive or any other assembly,

• when the delta temperature is more than

• after performing incoming performance verification and before performing outgoing performance verification.

The need for self calibration will also depend on your experience and on the environment in which you use the oscilloscope.

±5 °C different than the last calibration, or

Mainframe Cal Factor Memory Error

If power is applied to the oscilloscope and the message “Mainframe cal factor memory error: Please perform calibration” is displayed, you must calibrate the oscilloscope. See “To run the self calibration” in this chapter.

If the oscilloscope does not pass the self calibration, repair is necessary.

4–2

Chapter 4: Calibrating and Adjusting

Operating Hints

Some knowledge of operating the Agilent Technologies 54835A/45A/46A oscilloscope is helpful. However, procedures are written so that little experience is necessary. The following hints will speed progress of the procedures.

When using many averages, it often takes awhile for a waveform display to stabilize after a change. When a front panel control on the oscilloscope is changed, averaging automatically restarts. When the input signal or an adjustment is changed, the oscilloscope averages new data with the old, so it takes longer for the waveform to stabilize to the new value. Press the Clear Display key while changing input signals or adjustments. Clearing the display restarts averaging, which gives a quicker indication of the result of the change.

Loading Default Oscilloscope Settings

To reset the oscilloscope to default conditions, press the Default Setup key.

Loading New Software

This oscilloscope stores its operating system code on a hard disk drive. New code is lo a d e d in t o t h e os c il lo sc o p e by u si ng t he fl o pp y di s k dr i v e . It is r a r e l y ne ce ss ar y to re lo ad the code. You should load the code only if prompted by a troubleshooting procedure, or if you want to load a later version of code.

To load new code, enable the graphical interface, then select Upgrade Software from the Utilities menu. You can then follow the instructions on the screen, inserting diskettes as necessary.

Calibration Procedures

The procedures start with the next paragraphs. Unless specified elsewhere, procedures must be followed in the order given. Display checks are optional and independent of other procedures.

Let the Oscilloscope Warm Up Before Adjusting

Warm up the oscilloscope for 30 minutes before starting adjustment procedures. Failure to allow warmup may result in inaccurate calibration.

WARNING SHOCK HAZARD!

Read the Safety information at the back of this guide before performing adjustment procedures. Failure to observe safety precautions may result in electrical shock.

WARNING INJURY CAN RESULT!

Install the fan safety shield (included in the Service Kit) if you remove the oscilloscope cover. Without this shield, the oscilloscope fan blades are exposed and can cause injury.

4–3

Chapter 4: Calibrating and Adjusting

To check the power supply

There are no adjustments for the supply. Perform this procedure only if you suspect a power supply problem.

Equipment Required

Equipment Critical Specifications Recommended Model/Part

Digital Voltmeter Accuracy ±0.05% Agilent 34401A

Procedure

Disconnect the oscilloscope power cord and remove the cover.

If necessary, refer to the procedures in chapter 6, “Replacing Assemblies.”

WARNING INJURY CAN RESULT!

Use care when working around the oscilloscope with the cover off and power applied. The fan blades are exposed and could cause injury; also, there is approximately 900 V generated by the backlight inverter for the flat-panel display.

Figure 4-1

Connect the oscilloscope power cord and set power switch to ON.

3 Refer to the following figure for testpoint locations.

Power Supply Test Points

4–4

Connect the common lead of the voltmeter to the GND test point.

4 5 Connect the positive lead of the voltmeter to the +5.1 V test point. 6 Verify that the +5.1 supply voltage is within limits as shown in the following table:

Table 4-1 Power Supply Voltage Limits

Supply Voltage Specification Limits

+5.1 V ± 0.1 V +5.0 V to +5.2 V

-5.2 V ± 0.1 V -5.1 V to -5.3 V

+12.2 V ± 0.3 V +11.9 V to +12.5 V

-12.2 V ± 0.3 V -11.9 V to -12.5 V

+15 V bias +14 V to +16 V

Repeat steps 4 through 6 for each of the other supply voltages.

If any supply voltage is not within specifications, see chapter 5, “Troubleshooting.”

Chapter 4: Calibrating and Adjusting

To check the power supply

4–5

Chapter 4: Calibrating and Adjusting

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

This test is optional. The 715 Hz auxiliary output is not specified in the oscilloscope performance specifications. The values given are typical. Results are not recorded in the Performance Test Record.

Equipment Required

You can check the 715 Hz auxiliary output using the scope itself.

Procedure

Press Default Setup.

2 Use a BNC cable to connect the front panel Aux Out to the Channel 1 input. 3 Set Coupling to DC and Input to 50Ω for Channel 1. 4 Press Autoscale. 5 Select Vamptd from the Voltage submenu of the Measure menu. 6 Select Frequency from the Time submenu of the Measure menu. 7 The signal should be a squarewave at approximately 715 Hz with amplitude of

approximately 300 mV

4–6

Chapter 4: Calibrating and Adjusting

To check the flat panel display (FPD)

No equipment is required for this procedure. Specifications for flat-panel displays used in the Infiniium oscilloscope are shown in the following table.

Flat-Panel Display Specifications

Defect Type Limit

Polarizer Scratch Width ≤ 0.05 mm

Dent φ ≤ 0.4mm

Dot Defect (A dot is defined as 1, 2, or 3 stuck subpixels touching horizontally. Subpixels are horizontal red, green, blue triads, so these may show up as one of 8 colors or black.)

Line Defect Not allowed

Non-uniformity Check other specifications

Luminance (The measurement is perpendicular to the screen surface in both axes.)

Bright dot N ≤ 5

Dark dot N ≤ 7

Total dot N ≤ 12

Two adjacent dots

Bright dot Dark dot

Three or more adjacent dots Not allowed

Distance between defects

Bright dot Dark dot

Minimum Typical

Length ≤ 10 mm

≤ 2 pairs ≤ 2 pairs

≥ 10 mm ≥ 10 mm

160 cd/m 200 cd/m

2 2

When to Use this Procedure

This procedure should not be performed as a part of routine maintenance. Perform the procedure only when there appears to be a problem with the display.

Enable the graphical interface.

2 Select Self Test from the Utilities menu. 3 Click the Service Extensions box in the Self Test dialog. 4 Select Screen from the Test drop-down list box.

See figure 4-2.

4–7

Figure 4-2

Click to start the test

Select Screen to do the flat-panel display test

Chapter 4: Calibrating and Adjusting

To check the flat panel display (FPD)

Starting the Screen Test

5 Click Start.

A new dialog appears with a series of radio buttons that allow selection of different background colors. See figure 4-3.

4–8

Figure 4-3

Click one of these buttons to select the background color to check

Chapter 4: Calibrating and Adjusting

To check the flat panel display (FPD)

Screen Test

6 Select a color by clicking the radio button for that color. 7 Carefully check the colored region for pixels colored differently than the current

selection.

These pixels are either inactive or stuck. If black (when a color or white is selected), they are inactive; if another color than the current selection, but not black, then they are stuck. If the display does not meet the specification given on the previous page, replace it. See chapter 6 for removal and replacement procedures.

Repeat steps 6 and 7 for all colors.

4–9

Chapter 4: Calibrating and Adjusting

To run the self calibration

The self calibration uses signals generated in the oscilloscope to calibrate channel sensitivity, offsets, and trigger parameters. You should run the self calibration

• yearly, or according to your periodic needs,

• when you adjust or replace the acquisition assembly or acquisition hybrids,

• when you replace the hard drive or any other assembly,

• when the delta temperature is more than

• after performing incoming performance verification and before performing outgoing

performance verification.

Equipment Required

Equipment Critical Specifications Recommended Model/Part

Cable BNC 50 Ω 9 inch Agilent 10502A

±5 °C different than the last calibration, or

Let the Oscilloscope Warm Up Before Running the Self Calibration

The self calibration should only be done after the oscilloscope has run for one half hour at ambient temperature with the cover installed. Calibration of an oscilloscope that has not warmed up may result in performance test failure.

self calibration

Calibration time

It will take approximately 45 minutes to run the self calibration on the oscilloscope, including the time required to change cables from channel to channel.

Enable the graphical interface.

1 2 Select Calibration from the Utilities menu. 3 If the Cal Memory Protect box in the Calibration dialog is checked, click the check box

to clear the check mark.

See figure 4-4.

4–10

Figure 4-4

Clear this check box before starting calibration

Click here to start calibration

Chapter 4: Calibrating and Adjusting

To run the self calibration

Calibration Dialog

Clear Cal Memory Protect to Run self calibration

You cannot run self calibration if this box is checked.

Click Start, then follow the instructions on the screen.

You will be asked first to disconnect all channels and the Aux Output, then to connect Aux Out to each channel and the auxiliary trigger in turn. After you complete each cable change, click OK in the dialog box to continue the calibration.

The oscilloscope displays a Passed/Failed message as each calibration routine is completed.

After calibration has been completed, click to check the Cal Memory Protect box to protect the calibration memory. Then click Close.

If calibration fails

Go to chapter 5 “Troubleshooting.”

4–11

4–12

Test Procedure 5-17

Troubleshooting Procedure 5-18 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 (AMI Motherboard only) 5-24 To configure the motherboard jumpers and set up the BIOS 5-29

Motherboard / floppy drive configurations BIOS setup 5-29

Configuring the AMI Series 727 Motherboard Jumpers 5-32

To configure the AMI Series 727 WINBIOS Parameters 5-34

Configuring the AMI Series 757 Motherboard for 200 MHz CPU 5-37

To configure the AMI Series 757 WINBIOS Parameters with 1.44 Mbyte floppy drive 5-39

Configuring the AMI Series 757 Motherboard for 300 MHz CPU 5-42

To configure the AMI Series 757 WINBIOS Parameters with 120 Mbyte floppy drive 5-44

Configuring the FIC VA-503A motherboard switches for the 400 MHz CPU and 120 Mbyte

floppy drive 5-47

To Configure the FIC Series VA-503A Motherboard BIOS Parameters 5-48 To troubleshoot the acquisition system 5-49

Determining the Acquisition Contact Closure Count 5-49

Isolating Acquisition Problems 5-49 To troubleshoot attenuator failures 5-56

Attenuator Click Test 5-56

Swapping Attenuators 5-57

Attenuator Connectivity Test 5-57 Software Revisions 5-59

Troubleshooting

This section provides troubleshooting information for the Agilent Technologies 54 83 5 A / 45A/46A oscilloscop e . T h e service strategy of t his instrument is repla cem e n t of defective assemblies.

Safety

Read the Safety Summary at the front of this manual before servicing the instrument. Before performing any procedure, review it for cautions and warnings.

WARNING SHOCK HAZARD!

Maintenance should be performed by trained service personnel aware of the hazards involved (for example, fire and electric shock). Lack of training and awareness of the hazards could result in electrical shock. When maintenance can be performed without power applied, the power cord should be removed from the instrument.

WARNING INJURY CAN RESULT!

Use caution when working around the cooling fan with the cover removed from the instrument. The cooling fan blades are exposed on one side and can be hazardous. Install the optional fan safety shield (Agilent Technologies P/N 54801-00601) to protect your fingers from the fan blades.

Tools Required

You will need basic electronic troubleshooting tools, including a digital multimeter and a 100-MHz oscilloscope. Performance verification tests have more stringent requirements. See chapter 1 for the list of recommended test equipment.

If you need to remove and replace assemblies, you will need some of the hand tools listed in chapter 6, “Replacing Assemblies.”

ESD Precautions

When using any of the procedures in this chapter, you should use proper ESD precautions. As a minimum, you should place the instrument on a properly grounded ESD mat and wear a properly grounded ESD wrist strap.

Keystroke Conventions

To guide you while setting up the oscilloscope, the following conventions are used to represent keystrokes and other interactions with the instrument:

• When you need to issue a command through the graphical interface, the command will be phrased like this: “Select <command> from the <menu name> menu.”

• When you need to click on an object on the graphical interface, the instructions will be phrased something like this: “Click the OK button.”

• When you need to press a key, the instructions will be phrased something like this: “Press the Run key.”

5–2

Figure 5-1

Chapter 5: Troubleshooting

To install the fan safety shield

Default Setup

A Default Setup is provided to assure the instrument setup is in a known default state. The default setup prevents previous setups from interfering with the next test. It also simplifies the instrument setup procedure. Use the default setup when a procedure requires it.

• Press the Default Setup key to set the instrument to the default state.

To install the fan safety shield

1 Disconnect the instrument power cord and remove the cover.

If necessary, refer to the procedures in chapter 6 "Replacing Assemblies".

2 Clip the fan safety shield over the outside of the instrument chassis next to the fans.

See figure 5-1.

Installing the Fan Safety Shield

Fan Safety Shield

5–3

Chapter 5: Troubleshooting

To troubleshoot the instrument

The troubleshooting procedure is used to isolate problems to a faulty assembly. When you find the faulty assembly, use the disassembly and assembly procedures in chapter 6 to replace the assembly.

The primary procedural tool in this section is the flowchart. The flowchart contains the entire troubleshooting path from a failed instrument to a working one, and will direct you in an orderly manner through the possible failure symptoms. Reference letters on the flowcharts point to procedural steps that explain the brief instructions in the chart. Do not try to troubleshoot by fo llowi ng onl y the re fere nce tex t becau se the text i s not in the corr e c t order for tr ouble shoot ing. Instead, simply follow the flowchart.

If you are unfamiliar with this instrument, start with the Primary Trouble Isolation Flowchart on the next page.

5–4

Chapter 5: Troubleshooting

To troubleshoot the instrument

Primary Trouble

Isolation

Perform Power-Up

Check Display

Run Scope Self Tests

Display on

Screen?

Yes

Scope Self-Tests

Pass?

Yes

Check Front Panel

Response

Front Panel

Response OK?

Run Knob, Key, and

LED Tests

Go to No Display

Troubleshooting

Go to Acquisition

Troubleshooting

System Works; Run Self-Calibration; Do Performance Tests

End

Primary Trouble Isolation Flowchart

Knob, Key, and

LED tests pass?

Yes

NoYes

Keyboard

Troubleshooting

5–5

Figure 5-2

Chapter 5: Troubleshooting

Primary Trouble Isolation

The actions in the Primary Trouble Isolation are done without disassembling the instrument. Interaction of the front panel with the rest of the instrument and other indicators are used to help identify the problem area.

A letter is assigned to boxes in the flowchart. The letter corresponds to a specific section in the reference text. Be sure to use the flowchart itself for your troubleshooting path.

Perform power-up.

1 Power-on the instrument.

A short time after the instrument is turned on, the scope graticule is displayed on the screen. The screen should look similar to the next figure. The exact appearance may vary depending on the setup selected before the instrument was turned off.

Power-on Display Default (Graphical Interface Disabled)

2 Press the Default Setup key.

B Check the display.

The display on the screen should be similar to the figure above. If there is no display on the oscilloscope flat-panel display after power-up, go to the No Display Trouble Isolation Flowchart for further troubleshooting.

5–6

Chapter 5: Troubleshooting

Primary Trouble Isolation

Run oscilloscope self-tests.

1 Enable the graphical interface.

2 Select Self Test from the Utilities menu.

3 Select Scope Self Tests from the Self Test drop down list box.

4 Click the Start Test button and follow the instructions on the screen.

If any of the selftests fail, go to the Acquisition Trouble Isolation troubleshooting flowchart later in this chapter for further troubleshooting. Otherwise, go to step D.

Check the front panel.

Randomly press the front panel keys and rotate the knobs to verify that they work correctly. If any fail to work, run the Knob and Key selftest and the LED selftest in step E.

Run the Knob and Key selftest and the LED selftest.

1 Enable the graphical interface.

2 Select Self Test from the Utilities menu.

3 Select the Knob and Key selftest from the Self Test drop down list box.

4 Click the Start test button and follow the instructions on the screen.

If any of the knobs or keys do not work, go to “To check the keyboard” later in this chapter.

5 Select the LED selftest from the Self Test drop down list box.

6 Click the Start test button and follow the instructions on the screen.

If any of the LEDS do not work, go to “To check the LEDs” later in this chapter.

The system is operational. Performance test the oscilloscope using the procedures in

chapter 3 of this service manual.

5–7

Chapter 5: Troubleshooting

Primary Trouble Isolation

No Display Trouble

Isolation Chart

Remove cabinet and

install fan guard

Check fan

connections and

power-on

Fans running?

Power LED Lit?

Yes

Connect external

monitor, cycle power,

and check power up

sequence

Power-up

displayed on ext.

monitor?

Yes

Use visual & audible

powerup sequence

chart, troubleshoot &

repair.

Go to Power Supply

Trouble Isolation

Check video to flat-

panel display

Video to flat-

panel display OK?

Yes

Check backlight, etc.

No Display Trouble Isolation Flowchart

5–8

Replace SVGA Card

No Display Trouble Isolation

This trouble isolation procedure helps isolate a problem to the assembly level when there is no display on the flat-panel liquid crystal display screen.

Remove the cabinet and install the fan safety shield.

1 Disconnect the power cord from the oscilloscope. Refer to chapter 6, “Replacing

Assemblies,” for instructions on removing the cabinet. Use care in handling the instrument.

2 Install the optional fan safety shield, Agilent Technologies P/N 54801-00601, over the fans

on the left side of the instrument.

WARNING SHOCK HAZARD!

The backlight inverter assembly, which is mounted at the front corner of the instrument near the flat-panel display, operates at 900 V at turn on. DO NOT handle this assembly while it is in operation.

WARNING INJURY CAN RESULT!

Once the cover is removed, the fan blades are exposed both inside and outside the chassis. Disconnect the power cable before working around the fan. Use extreme caution in working with the instrument when the cover is removed. Install the fan safety shield (Agilent Technologies P/N 54801-00601) on the side of the chassis over the fan. Failure to observe these precautions may result in injury.

Chapter 5: Troubleshooting

No Display Trouble Isolation

3 Connect the power cord and press the power switch on the front panel.

Check the fan connections.

Verify that the fan mounted in the left side of the instrument and the CPU fan (on the motherboard) are connected.

1 The instrument fans connect to the side of the Acquisition assembly at J3 and J5.

2 The CPU fan connects to the top side of the motherboard at J46 (Fan Power).

3 Connect the power cord and press the power switch on the front panel. Verify that both

fans are running and that the front panel power switch LED is illuminated. These are indications that the power supply is functioning. If the fans and LED are off, go to the Power Supply Trouble Isolation flowchart.

Connect an external monitor, cycle power, and observe the instrument power-on sequence.

See table 5-1 to check the visual and audible power-on sequence, and repair as needed, referring to other procedures as directed.

5–9

Chapter 5: Troubleshooting

No Display Trouble Isolation

Table 5-1

Power-On Sequence with External Monitor Connected

Time Audible Indicators Visible Indicators Description Troubleshooting

1 Power-on Power-on the instrument and listen

2 Fans begin running Power switch LED illuminates The main instrument fan and the

3 HDD (hard disk drive)

begins turning

* Later model hard disk drives are much quieter than earlier models. The clicking can only be heard with the instrument sleeve removed and in close proximity to the hard disk drive.

Front panel LEDs come up in power-on pattern

for the fans and the hard disk drive. The hard disk is located behind the floppy drive ag ainst the chassis side wall.

CPU fan start running at power on. The LED located behind the front panel power switch is connected to the +5 V supply, making it a good power supply indicator.

The front panel LEDs display their power-up pattern. The following trigger LEDs should all come on at the same time: Edge, Glitch, Advanced, Positive and Negative slope, DC, AC, LF Reject, and HF Reject. This pattern indicates that the front panel keyboard has completed its power-on test.

The hard disk drive (HDD) starts spinning at power on. Listen at the top right rear of the instrument for a higher-pitched whine; this is the HDD coming up to speed. Shortly after the disk comes up to speed, you should hear a brief burst of clicks*; this sound is part of the disk's power-up self-check routine.

You will need to use a DMM to verify that the supply voltages are within specifications. If the power supplies do not come up, go to the “Power Supply Trouble Isolation” flowchart

If the LEDs do not come on, check the cabling to the front panel board and check for +5 V on pin 2 of the 10-pin conductor keyboard cable W16. Also check for +5 V on the scope interface card A6. If the +5 V is at the scope interface car d but the front panel LEDs do not come on, the problem is the cable or the front panel keyboard A7.

If the HDD is not responding, check the cabling. If the disk is turning, but you do not hear the brief burst of clicks after the disk comes up to speed, the circuitry onboard the disk drive may be at fault. If the motherboard (including CPU and RAM) are functioning but the HDD is not responding, the external VGA monitor will usually show the message "16000 KB OK, WAIT..." followed by the message "Pri Master HDD Error, RUN SETUP, Press F1 to Resume. See “To configure the motherboard jumpers and set up the BIOS” on page 5-29. for information on how to access and run the setup program. If, after running setup, there is still a p roblem, check the cabling for the hard disk drive, both between the motherboard and SVGA display board, and between the SVG A display board and the HDD. If the cabling is OK, see the section on verifying motherboard operation; otherwise, replace the HDD.

5–10

Chapter 5: Troubleshooting

No Display Trouble Isolation

Time Audible Indicators Visible Indicators Description Troubleshooting

4 HDD clicking* PC Power-On Self Test

(POST) memory test message on external monitor.

5 HDD clicking* System board configuration

appears on external monitor and internal display.

6 HDD clicking* The Infiniium display appears

on the internal and external displays.

The HDD begins clicking* as it is accessed by the system. The external SVGA monitor shows the POST messages. These messages show the memory test.

The HDD continues clicking* as the instrument loads the oscilloscope application. The flat panel LCD backlight comes on and the display shows the system board configuration. This is an indication that the motherboard and SVGA display board are functioning correctly.

The HDD continues clicking.*

If there is no display on the external monitor, either the motherboard A4 (including CPU or RAM), the SVGA display board, cabling, or external VGA monitor are suspect. Check the cabling and VGA monitor first. Next, use a POST (Power-On Self Test) card to help isolate the nodisplay proble m. Install the POST card in an ISA slot and apply power to the instrument. The POST card displays the respective codes as the poweron self tests are completed. See the “POST Code Listing” in this chapter for codes and descriptions. Replace the motherboard, CPU, or RAM as indicated from the POST code listing.

7 Attenuators click as

solenoids are preset to known states

8 Attenuators click to

their operating states (second interval, indicates scope running)

* Later model hard disk drives are much quieter than earlier models. The clicking can only be heard with the instrument sleeve removed and in close proximity to the hard disk drive.

Front panel LEDs change to a normal operating pattern. Both screens go blank momentarily.

Oscilloscope display comes up on both the external monitor and the scope's front panel display.

The attenuators click. This is louder than the HDD clicking and comes from the front of the instrument. The front panel LEDs ch ange to a normal operating pattern. For example, the Trigger LEDs show only one trigger mode, such as Edge, and one trigger coupling, such as dc.

The attenuators cl ick a second time. The oscilloscope display backlight comes on, and the display appears on both the external monitor and the scope's front panel display. The oscilloscope is running.

If the attenuators click a second time but the display does not come up, try the front panel keys to see whether they respond. If so, there is a display problem. If the external monitor shows the screen but the oscilloscope does not, the problem may be with cabling, the backlight inverter board A3 not supplying +900 V and +12 V, the flat-panel display A2, or the SVGA display board A5. See the sections “To check the backlight inverter voltages” and ”To check the SVGA display board video signals.”

5–11

Chapter 5: Troubleshooting

No Display Trouble Isolation

Power Supply

Trouble Isolation

Check Power Supply

Voltages

Voltages OK?

Check power supply

resistances

Power supply and

display OK, return to

primary trouble

isolation chart

Yes

Check for display

Power supply OK,

return to no-display

trouble isolation

Yes

onscreen

Display

onscreen?

chart

Resistance OK?

Override the Remote

Inhibit Signal

Power-up OK?

Check Bias and

Remote Inhibit

Yes

Cabling

Replace shorted

assembly

Replace Power

Supply

Power Supply Trouble Isolation Flowchart

5–12

Figure 5-3

Chapter 5: Troubleshooting

Power Supply Trouble Isolation

These trouble isolation instructions help isolate the problem to the assembly level when the power supply is not operating. Because of advanced power supply protection features, the problem may not be with the supply itself, and therefore you will need to work through the procedure systematically to determine the source of the fault.

Check the power supply voltages.

You check the power supply voltages on the acquisition board, A13. See figure 5-3 for the location of these test points. Table 5-2 shows the allowable range of power supply voltages.

Power Supply Voltage Test Locations (A13)

Table 5-2 Power Supply Voltage Limits

Supply Voltage Specification Limits

+5.1 V ± 0.1 V +5.0 V to +5.2 V

-5.2 V ± 0.1 V -5.1 V to -5.3 V

+12.2 V ± 0.3 V +11.9 V to +12.5 V

-12.2 V ± 0.3 V -11.9 V to -12.5 V

Turn off the power and measure the power supply resistances to ground to check for shorted supply lines.

You can probe the test points on A13, shown in figure 5-3, for this resistance check. Table 5-3 shows the characteristic resistance values for the Agilent Technologies 54835A/45A oscilloscope.

Table 5-3 Approximate Resistance Values, Each Power Supply to Ground

Supply Approximate Resistance to Ground

+12 V 300Ω

–12 V 180Ω

–5.2 V 10Ω

+5.1 V 50Ω

5–13

Chapter 5: Troubleshooting

Power Supply Trouble Isolation

Replace any shorted assembly.

You can locate the shorted assembly by disconnecting assemblies from the power supply, one at a time. Use the power supply distribution chart in table 5-4 as a guide to locating the shorted assembly.

Reconnect Assemblies and Cables

Reconnect al l assemblies after tes ting. The oscilloscope must have all cables c onnected for correct po wer up.

If you want to test the power supply without any assemblies connected, the +5 V supply must be loaded to 2 A. Use two 5

Ω, 10W resistors between the +5 V output and ground.

Table 5-4

Power Supply Distribution

Assembly +5.1 V -5.2 V Ground +12.2 V -12.2 V 3.3 V (generated on Motherboard)

Acquisition X X X X X

Motherboard X X X X X X

Probe Power & Control

Front-Panel Keyboard

Scope Interface Board

Display Board X X X X X

Backlight Inverter

Flat Panel Display

Floppy Disk Drive X X

Hard Disk Drive X X

Override the Remote Inhibit signal.

XXXX

XX X

Power up the unit by connecting a resistor between pin 3 and pin 11 of power supply control cable W2. Use a resistor in the range of 196-220

Ω, 1/8 W, such as Agilent Technologies

P/N 0698-3440 or 0757-0407.

See figure 5-4.

Figure 5-4

Power-up Sense Resistor Connection

5–14

Figure 5-5

Chapter 5: Troubleshooting

Power Supply Trouble Isolation

Check +15 V Bias and Remote Inhibit cabling.

If the oscilloscope will not power up, check all cabling to troubleshoot and correct the problem.

Figure 5-4 shows the routing of the +15 V Bias and Remote Inhibit signals from the front panel to the power supply. The power supply is on only when the remote inhibit signal is between +1 V and +5 V. A problem could be caused by a faulty cable or bad connector anywhere in this path. Check all the cables and connections and replace any at fault.

Front Panel Power

Switch

A8 Cursor Keyboard

W15

A7 Front Panel Keyboard

A6 Scope Interface Board

A13 Acquisition Board

J3 31

J16

J11

A1 Power Supply

4955

W16

W11

Remote Inhibit+15 V Bias

Routing of +15 V Bias and Remote Inhibit Signals

F Replace the power supply.

1 If the +15 V bias is correct, but the instrument will not power up with a 196-220Ω res isto r,

replace the power supply. Chapter 6 explains how to remove and replace the power supply.

2 Re-assemble the instrument and apply power.

Check for the oscilloscope display onscreen.

1 You should see the oscilloscope display (see figure 5-2). If not, see the No Display Trouble

Isolation Flowchart.

2 If you see the display, return to the Primary Trouble Isolation Flowchart.

5–15

Chapter 5: Troubleshooting

To check probe power outputs

Probe power outputs are on the front panel, surrounding each BNC input.

Use the table and figure to the right to check the power output at the connectors.

The +12 V and –12 V supplies come directly from the power supply, and the +3 V and –3 V supplies are developed in three-terminal regulators on the probe power & control

Pin Supply

1+3V

2 –3V

3 Offset

4Data

5 & ring

Probe ID

assembly.

6Clk

Measure the voltages with respect to the ground terminal on the front panel, located near the Aux Out BNC.

8 –12 V

9 +12 V

Do not attempt to measure voltages at pins 3 through 7.

Any failure may be a problem with the probe power and control assembly, the AutoProbe flex cable W13, or the probe power and control cable W12.

5–16

Figure 5-6

When you push a key or turn a knob in both directions, the corresponding symbol on this screen turns green.

Chapter 5: Troubleshooting

To check the keyboard

Test Procedure

Use this procedure to verify correct keyboard operation.

Enable the graphical interface.

1 2 Select Self Test from the Utilities menu. 3 Select Knob and Key from the Self Test drop down list box, then click Start.

A new window appears with a symbolic representation of the keyboard. See figure 5-6.

Knob and Key Self Test Screen

4 Push each key on the keyboard until you have pushed all keys.

When you push a key, the corresponding key symbol on the display should change from red to green.

Turn each knob in both directions until you have turned all knobs.

When you turn a knob in one direction, the corresponding knob symbol on the display should change from red to yellow. When you then turn the knob in the other direction, the knob symbol should change from yellow to green.

When you are finished, click Close.

If any knob failed, you should replace the keyboard assembly. If you encounter any key failures, record the location of those failures, then go to the troubleshooting procedure that follows.

5–17

Chapter 5: Troubleshooting

To check the keyboard

Troubleshooting Procedure

Use this procedure only if you encounter key failures in the keyboard test procedure. If any knobs fail, replace the keyboard assembly.

Disconnect the power cord and remove the cover.

1 2 Remove the front panel assembly.

See chapter 6 for instructions.

3 Remove the keyboard assembly and the cursor keyboard assembly from the front panel

assembly. Partially re-assemble the front panel assembly, including the flat-panel display and lens, but omitting the keyboard and cursor keyboard. Re-attach the partial assembly to the chassis.

Be sure to reconnec t the display video cable and the backlight inverter cab les. See chapter 6 for instructions on removing and disassembling the front panel.

Separate the elastomeric keypads from the cursor keyboard and keyboard assemblies.

CAUTION CONTAMINATION CAN CAUSE INTERMITTENT OPERATION!

Be careful not to contaminate the key side of the PC board or the keypads. Dust and fingerprints on these parts may cause intermittent key operation.

Set the cursor keyboard and keyboard assembly on an antistatic electrical insulated surface.

6 Connect the cursor keyboard cable to the keyboard assembly. Connect the keyboard

cable to the scope interface board in the chassis.

Yo u may n eed to s et the chassi s on i ts side to al low pr oper r outin g of the cables with out str a i ning them.

Reconnect the power cable and apply power.

8 Enable the graphical interface, then start the keyboard test as described in the previous

procedure.

9 Carefully short the PC board trace, with a paper clip or screwdriver, at each

nonoperating key (as determined by keyboard test), and look for an appropriate response on the display.

• If the display responds as though a key were pressed, replace the elastomeric keypad.

• If the display does not respond as though a key were pressed, replace the keyboard.

Re-assemble the instrument.

5–18

Figure 5-7

Chapter 5: Troubleshooting

To check the LEDs

Use the following procedure to test the front-panel LED (light-emitting diode) indicators.

1 Enable the graphical interface. 2 Select Self Test from the Utilities menu. 3 Select LED from the Self Test drop-down list box, then click Start Test.

The LED test screen appears, which shows a symbolic representation of all front panel LED indicators. See figure 5-7.

LED Test Screen

4 Push the Marker A left and right arrow keys to highlight each LED symbol in the test

screen. Verify that the corresponding LEDs on the front panel are the only ones illuminated.

Test by Rows

You can use the Marker B arrow keys to test LEDs by row; however, in the event that two LED indicators are shorted together, there is a small chance that the test will not reveal the failure.

5–19

Chapter 5: Troubleshooting

To check the LEDs

When you are finished, click Close.

If you see a failure with the Auto or Trig’d LEDs, check the voltage at pin 6 of W16, with W16 disconnected from the keyboard. The voltage should be as follows:

±0.5 V when both LEDs are supposed to be off.

•0 V

• 2.5 V

• 5.0 V

If the voltages are not correct, the problem may be with keyboard cable W16, scope interface board A6, acquisition cable W11, or acquisition board W13. Try troubleshooting the acquisition system fi r s t to verify co r r e ct beha v i o r before re p l a c ing any as s e m b lies. If th e vo ltage s ar e correct but the LEDs do not light correctly, replace the keyboard assembly.

If you find a problem with th e Armed LED, check pin 5 of W1 6 with th e cable disconnec ted fro m the keyboard. The voltage should be as follows:

•5.0 V

• < 3.6 V

Isolation is the same as for the Trig'd and Auto LEDs.

If you find any other failures, replace the keyboard assembly. If the front panel power indicator LED does not light, replace the cursor keyboard assembly.

±0.5 V when Trig'd is supposed to be on and Auto is supposed to be off. ±0.5 V when both LEDs are supposed to be on.

±0.5 V when Armed is supposed to be on.

5–20

Chapter 5: Troubleshooting

To check the motherboard, CPU, and RAM

This procedure verifies that the PC system board and the associated CPU and RAM are fun c ti o n in g . It as s ume s tha t the po w er su p pl y , SVG A disp l ay bo ard , and an ex te r n al VG A mo n i to r are functioning correctly.

Connect an external keyboard to the keyboard port.

2 Connect an external VGA monitor to the VGA output connector on the rear panel. 3 Hold down the Insert key on the external keyboard, then apply power to the

oscilloscope.

4 Verify that a message, such as the following, appears on the external monitor:

AMI Atlas-III PCI/ISA AMD-K6(tm)-/200 Checking NVRAM 16000 KB OK

WAIT...

<INS> Pressed

RUN SETUP Press F1 to Resume

Messages Vary Slightly

These messages may vary slightly depending on the motherboard version.

If the above message is displayed, you can assume that the PC system board, CPU, and RAM are functioning correctly.

If the message is not displayed or there is no display, remove the GPIB interface board and LAN interface board and try the test again. Procedures to remove the interface boards are given in chapter 6, “Replacing Assemblies.”

If you need to run setup, press F1. Otherwise, turn off power and proceed with troubleshooting. See “To configure the motherboard jumpers and set up the BIOS” for information.

5–21

Chapter 5: Troubleshooting

To check the SVGA display board video signals

The video signals are checked on the 40-pin connector J103 on the SVGA display board A5. Use a 100-MHz, general-purpose oscilloscope, such as the Agilent Technologies 54600B, to verify the signals. Even-numbered pins are on the top side of the connector. The video signals are present during the system boot process before the backlights come on. If the signals are not present, suspect the display card. If the signals are present and the backlights are on, suspect the flatpanel display as the problem.

Table 5-5

Figure 5-8

Video Signals

Pin Number Signal

1-2 +3.3 V

3, 5-6 NC

4, 7-9, 11, 15, 19, 23, 27, 31, 35, 38, 40 Ground

12-14, 16-18 Blue video

20-22, 24-26 Green video

28-30, 32-34 Red video

10 Panel enable

36 Panel HSync

37 Panel VSync

39 Panel Clk

Video Signals

5–22

Chapter 5: Troubleshooting

To check the backlight inverter voltages

The backlight inverter board A3 is located in the front-left corner of the oscilloscope (as you face the front panel).

• There is one input connector on the side of the board.

• T here a re tw o outp ut co nnecto r s, on e a t each end o f the b o ar d (top and b ott om), w hich po wer the two backlights inserted into the flat panel display.

The output voltage is approximately 300-450 V two wires) when the backlight is illuminated. The voltage is approximately 1 kV before the backlight tube is illuminated.

The outputs are controlled by the input. Notice that input pin 5 goes low to enable the output voltage. These pins can be reached at J1 on the SVGA display board A5.

, 40 kHz (measured differentially between the

rms

Table 5-6

Backlight Inverter Board Input Voltages

Input Pin # 7 65432 1

Backlight OFF 0 V 0 V 12 V 0 V 0 V 12 V 12 V

Backlight ON 0 V 0 V 0 V 0 V 0 V 12 V 12 V

5–23

Agilent Technologies 54835A, 46A, 45A User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

General Information

Instruments covered by this service guide

Accessories supplied

Options available

Accessories available

Specifications & characteristics

CAT I and CAT II Definitions

Agilent Technologies 54835A/45A/46A general characteristics

Recommended test equipment

Preparing for Use

To inspect the instrument

To connect power

To connect the mouse or other pointing device

To attach the optional trackball

To connect the keyboard

To connect to the LAN card

To connect oscilloscope probes

To connect a printer

To connect an external monitor

To connect the GPIB cable

To tilt the oscilloscope upward for easier viewing

To power on the oscilloscope

To verify basic oscilloscope operation

To clean the instrument

To clean the display monitor contrast filter

Testing Performance

To test the dc calibrator

Procedure

To test input resistance

Procedure

To test voltage measurement accuracy

Specification

Procedure

To test offset accuracy

Procedure

To test bandwidth

Specification

Equivalent Time Test

Real Time Test

To test time measurement accuracy

Equivalent Time Mode Procedure

Real-Time Mode Procedure

To test trigger sensitivity

Specification

Internal Trigger Test

Procedure—Auxiliary Trigger Test

Calibrating and Adjusting

To check the power supply

Procedure

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

Equipment Required

Procedure

To check the flat panel display (FPD)

To run the self calibration

self calibration

Troubleshooting

To install the fan safety shield

To troubleshoot the instrument

Primary Trouble Isolation

No Display Trouble Isolation

Power Supply Trouble Isolation

To check probe power outputs

To check the keyboard

Test Procedure

Troubleshooting Procedure

To check the LEDs

To check the motherboard, CPU, and RAM

To check the SVGA display board video signals

To check the backlight inverter voltages