Agilent Technologies Infiniium 90000 A User manual

Service Guide
Publication Number 54913-97022
March 2013
©Agilent Technologies, Inc. 2007-2013
Infiniium 90000 A-Series Oscilloscopes

2
Agilent Infiniium 90000 A-Series Oscilloscopes at a Glance
Ease of use with high performance
The Agilent Infiniium 90000 A-Series
oscilloscopes combine unprecedented ease-of-
use with high-performance digitizing
oscilloscope functionality tosimplifyyourdesign
and analysis measurement tasks.
• Traditional oscilloscope front-panel
interface provides direct access to the
controls needed for most troubleshooting
tasks.
• Graphical user interface with menus,
windows, dialogs, and toolbars provides
easy access to dozens of configuration and
analysis tools, ensuring you can set up and
make the most complex measurements.
• All models offer 40 GSa/s sampling rate on all
four channels.
• Models with bandwidths from 2.5 GHz to
13 GHz.
Display shows waveforms and graphical
user interface
• Graphical interface allows direct interaction
with waveforms, including drag-and-drop
positioning and instant waveform zoom.
• Touchscreen display allows oscilloscope
operation without an external pointing
device.
• Waveforms displayed in color, making
correlation easy.
• Current configuration parameters displayed
near the waveform display and are color-
coded to make identification easy.
• Graphical interface menus and toolbars
simplify complex measurement setups.
Horizontal controls set sweep speed and
position
• Main sweep speeds from 5 ps/div to 20 s/div.
• Zoom mode is from 1 ps/div to main time base
setting.
• Intensified waveforms on main sweep
window make it easy to see what will appear
in the zoom window.
Acquisition and general controls start and stop
the scope and do basic setup
• Run and stop controls for continuous or single
acquisitions.
• Clear display before one or more
acquisitions.
• Default setup and Autoscale set initial
configuration.
Hard disk drive and USB 2.0 port 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.
• Use graphical user interface to simplify
configuration of pattern, state, delay, and
violation trigger modes.
• Use auxiliary trigger to increase triggering
flexibility.
Vertical controls set attenuation, and
position
• Input attenuation adjustable from 1 mV/div to
1 V/div.
• Color-coded knobs make it easy to find the
controls that affect each waveform.
Marker and quick measurements help
measure waveform parameters
• Waveform markers A and B to check voltage
or Δ-time at any point on the displayed
waveform.

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In This Service Guide
This guide provides the service documentation for the Agilent Technologies 90000 A-Series
oscilloscopes. It is divided into seven chapters.
Chapter 1, "General Information," describes which oscilloscope models are covered by this
guide, environmental requirements, and oscilloscope dimensions.
Chapter 2, "Calibration," explains how and when you should run the user calibration procedure.
Chapter 3, "Testing Performance," provides information about testing the oscilloscope to verify
that it performs according to specifications.
Chapter 4, "Troubleshooting," provides information about how to identify defective assemblies.
Chapter 5, "Replacing Assemblies," provides instructions for removing and replacing defective
assemblies.
Chapter 6, "Replaceable Parts," provides exploded parts diagrams and a list for ordering
replaceable parts.
Chapter 7, "Theory of Operation," briefly describes the internal operation of the oscilloscope.
At the back of the book you will find safety notices.

4

Contents
5
1 General Information
Instruments covered by this service guide 8
Performance-Enhanced Versus Standard Models 9
Accessories supplied 10
Specifications and Characteristics 10
Environmental Conditions 11
Measurement Category 11
Oscilloscope Dimensions 12
2Calibration
To run the self calibration 15
3 Testing Performance
Performing Self-Test and Calibration 19
Offset Accuracy Test 21
DC Gain Accuracy Test 29
Analog Bandwidth - Maximum Frequency Check 35
Time Scale Accuracy (TSA) 42
Performance Test Record 45
4 Troubleshooting
To troubleshoot the oscilloscope 53
Primary Trouble Isolation 54
Power Supply Trouble Isolation 57
Under-Voltage Fault 60
Over-Temperature Fault 65
Over-Voltage Fault 68
Display Trouble Isolation 71
To check the backlight inverter voltages 73
To check the display board video signals 74
Front Panel Display Trouble Isolation 75
Front Panel Trouble Isolation 77
Motherboard Verification 78
To setup the BIOS 79
Acquisition/Backplane Assembly Trouble Isolation - Scope Self Tests 80
AutoProbe Board Trouble Isolation 83
To check the keyboard; Trouble Isolation Procedure 84
To check the LEDs 85
Software Revisions 86
To check probe power outputs 87
5 Replacing Assemblies
To return the oscilloscope to Agilent Technologies for service 91
To remove and replace the cover, top plate, and bottom plate 92

Contents
6
To remove and replace the front panel bezel and front panel circuit assembly 97
To remove and replace the on/off board 101
To remove and replace the backlight inverter board 103
To remove and replace the touch screen, the front deck, and the controller assembly 104
To remove and replace the motherboard 107
To remove and replace the acquisition boards/backplane assembly 108
To remove the backplane assembly from the acquisition assemblies 112
To set the calibration factors after replacing the acquisition board 113
To remove and replace the hard disk drive and the hard drive control board 115
Cable removal (for replacing the motherboard) 117
To remove and replace the power supply 122
To remove and replace the fans 123
To remove and replace the power cord 124
To remove and replace the USB or GPIB port 125
6 Replaceable Parts
Ordering Replaceable Parts 128
Exploded Views 129
Replaceable Parts List 133
7 Theory of Operation
Block-Level Theory 139

1
Instruments covered by this service guide 8
Accessories supplied 10
Specifications and Characteristics 10
Environmental Conditions 11
Measurement Category 11
Oscilloscope Dimensions 12
General Information

8
Instruments covered by this service guide
Oscilloscopes manufactured after the date this manual was released may be different from those
described in this manual. The release date of this manual is shown on the title page. This manual
will be revised when necessary.
If you have an oscilloscope that was manufactured after the release of this manual, please check
the Agilent Technologies website at www.agilent.com to see whether a newer version of this
manual is available.
The following 90000 A-Series oscilloscopes are covered in this guide.
Table 1 -1 Oscilloscopes Covered by this Service Guide
The oscilloscope model can be identified by the product number on the front or rear panel.
Model Bandwidth
DSO/DSA91304A 13 GHz bandwidth, 40 GSa/s
DSO/DSA91204A 12 GHz bandwidth, 40 GSa/s
DSO/DSA90804A 8 GHz bandwidth, 40 GSa/s
DSO/DSA90604A 6 GHz bandwidth, 20 GSa/s
DSO/DSA90404A 4 GHz bandwidth, 20 GSa/s
DSO/DSA90254A 2.5 GHz bandwidth, 20 GSa/s

Chapter 1: General Information
Performance-Enhanced Versus Standard Models
9
Performance-Enhanced Versus Standard Models
In the fall of 2009, Agilent started shipping performance-enhanced models of the 90000 A-Series
oscilloscope. This service guide covers both the standard and performance-enhanced versions
of the 90000 A-Series scopes. Any differences between the two versions are noted.
To tell whether the oscilloscope you have is a standard one or a performance-enhanced version,
check the front panel label. The performance-enhanced models have the works “Performance
Enhanced” on the label.

Chapter 1: General Information
Accessories supplied
10
Accessories supplied
The following accessories are supplied.
•Mouse
•Stylus
•Keyboard
• Accessory Pouch
• Front panel Cover
• Calibration Cable (not available or required for the DSO90254A)
• Precision 3.5 mm Adapters (qty 2)(not available or required for the DSO90254A)
• Probe De-skew and Performance Verification Kit, Agilent E2655B
• Power Cord (see parts list in chapter 6 for country-dependent part numbers)
• User's Quick Start Guide
Specifications and Characteristics
The following table contains a partial list of specifications and characteristics for the Agilent
Infiniium A-Series oscilloscopes. For a full list of specifications and characteristics, refer to the
data sheets at www.agilent.com/find/90000.
Specifications that are pertinent to each test are given in the "Testing Performance" chapter.
Specifications are valid after a 30-minute warm-up period, and within
± 5 ° C from the
temperature at which the last self-calibration was performed.
Environment Indoor use only.
Ambient
temperature
Operating 5 ° C to +40 ° C; non-operating –40 ° C to +65 ° C
Humidity Operating: up to 95% relative humidity (non-condensing) at +40
° C
Non-operating: up to 90% relative humidity at +65 °C
Altitude Maximum operating altitude: 4,000 m (12,000 ft)
Installation Category Installation category: 2.
Power Requirements 100-240 V, 47-63 Hz; 800 W max for 4-channel models.
100-240 V, 50 Hz;100-208 V, 50/60 Hz; 800 W max for 8-channel models.
Voltage Fluctuations Note that the mains supply voltage fluctuations are not to exceed +/-10% of the
nominal supply voltage.

Chapter 1: General Information
Environmental Conditions
11
Environmental Conditions
Overvoltage Category
This product is intended to be powered by MAINS that comply to Overvoltage Category II, which
is typical of cord-and-plug connected equipment.
Pollution Degree
The 90000 Series Oscilloscope may be operated in environments of Pollution Degree 2 (or
Pollution Degree 1).
Pollution Degree Definitions
Pollution Degree 1: No pollution or only dry, non-conductive pollution occurs. The pollution
has no influence. Example: A clean room or climate-controlled office environment.
Pollution Degree 2. Normally only dry non-conductive pollution occurs. Occasionally a
temporary conductivity caused by condensation may occur. Example: General indoor
environment.
Pollution Degree 3: Conductive pollution occurs, or dry, non-conductive pollution occurs which
becomes conductive due to condensation which is expected. Example: Sheltered outdoor
environment.
Measurement Category
Measurement Category
The 90000 Series oscilloscope is intended to be used for measurements in Measurement
Category I.
Measurement Category Definitions
Measurement Category I is for measurements performed on circuits not directly connected to
MAINS. Examples are measurements on circuits not derived from MAINS, and specially
protected (internal) MAINS derived circuits. In the latter case, transient stresses are variable;
for that reason, the transient withstand capability of the equipment is made known to the user.
Measurement Category II is for measurements performed on circuits directly connected to the
low voltage installation. Examples are measurements on household appliances, portable tools
and similar equipment.
Measurement Category III is for measurements performed in the building installation. Examples
are measurements on distribution boards, circuit-breakers, wiring, including cables, bus-bars,
junction boxes, switches, socket-outlets in the fixed installation, and equipment for industrial
use and some other equipment, for example, stationary motors with permanent connection to
the fixed installation.
Measurement Category IV is for measurements performed at the source of the low-voltage
installation. Examples are electricity meters and measurements on primary overcurrent
protection devices and ripple control units.
Transient Withstand Capability
The maximum transient withstand capability of this instrument is not specified. Do not apply
more than 5 volts rms at the oscilloscope’s vertical input BNC connectors.

Chapter 1: General Information
Oscilloscope Dimensions
12
Oscilloscope Dimensions
The following pictures show the dimensions of the frame.
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10.50 in
267 mm
17.36 in
441 mm
16.78 in
426 mm
18.02 in
458 mm
19.91 in
506 mm
17.02 in
432 mm

2
To run the self calibration 15
Calibration

14
Calibration
This chapter provides self calibration procedures for the oscilloscope.

Chapter 2: Calibration
To run the self calibration
15
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 replace the acquisition assembly or acquisition hybrids,
• when you replace the hard drive or any other assembly,
• when the oscilloscope’s operating temperature (after the 30 minute warm-up period) is more
than ±5°C different from that of the last calibration.
Equipment Required
Self calibration
1
Let the Oscilloscope Warm Up Before Running the Self Calibration.
The self calibration should only be done after the oscilloscope has run for 30 minutes at ambient
temperature with the cover installed. Calibration of an oscilloscope that has not warmed up may
result in an inaccurate calibration.
2
Pull down the Utilities menu and Select Calibration.
3 Click the check box to clear the Cal Memory Protect condition.
You cannot run self calibration if this box is checked. See Figure 2-1.
Let the Oscilloscope Warm Up Before Adjusting
Warm up the oscilloscope for 30 minutes before starting calibration procedure. Failure to allow warm
up may result in inaccurate calibration.
Equipment Critical Specifications Agilent Part Number
Adapters (2 supplied with oscilloscope except
for the DSO90254A)
3.5 mm (f) to precision BNC No substitute Agilent 54855-67604
Cable Assembly 50 Ω characteristic impedanceBNC (m)
connectors ~ 36 inches (91 cm) to 48
inches (122 cm) long
Agilent 8120-1840
Cable Assembly (supplied with oscilloscope
except for the DSO90254A which can use a good
quality BNC cable)
No substitute Agilent 54855-61620
10 MHz Signal Source (required for time scale
calibration)
Frequency accuracy better than 0.4 ppm Agilent 53131A with Opt. 010
Calibration time
It will take approximately 1 hour to run the self calibration on the oscilloscope, including the time
required to change cables from channel to channel.

Chapter 2: Calibration
To run the self calibration
16
Figure 2-1
Calibration Dialog Box
4
Click Start, then follow the instructions on the screen.
The routine will ask you to do the following things in sequence:
aDecide if you want to perform the Time Scale Calibration. Your choices are:
• Standard Calibration - Time scale calibration will not be performed. Time scale
calibration factors from the previous time scale calibration will be used and the 10 MHz
reference signal will not be required. The remaining calibration procedure will continue.
• Standard Calibration and Time Scale Calibration - Performs the time scale calibration.
This option requires you to connect a 10 MHz reference signal to channel 1 that meets
the following specifications. Failure to use a reference signal that meets this specification
will result in an inaccurate calibration.
• Standard Calibration and Reset Time Scalie Calibration - Factory time scale calibration
factors will be used. The 10 MHz reference signal will not be required. The remaining
calibration procedure will continue.
bDisconnect everything from all inputs and Aux Out.
cConnect the calibration cable from Aux Out to channel 1.
You must use the 54855-61620 cable assembly with two 54855-67604 adapters for all
oscilloscopes except for the DSO90254A which can use a good quality BNC cable. Failure
to use the appropriate calibration cable will result in an inaccurate calibration.
dConnect the calibration cable from Aux Out to each of the channel inputs as requested.
eConnect the 50 ΩBNC cable from the Aux Out to the Aux Trig on the front panel of the
oscilloscope.
fA Passed/Failed indication is displayed for each calibration section. If any section fails,
check the calibration cables and run the oscilloscope Self Test in the Utilities menu.
Page 87 also has a little section on what to do if a self cal fails in terms of replacing
assemblies.
5
After the calibration procedure is completed, click Close.
Click here to start
calibration
Clear this check
box before starting
calibration
Frequency: 10 MHz ±0.4 ppm = 10 MHz ±4 Hz
Amplitude: 0.2 Vpeak-to-peak to 5.0 Vpeak-to-peak
Wave shape: Sine or Square

3
Performance Test Interval 18
Performing Self-Test and Calibration 19
Vertical Performance Verification 20
Offset Accuracy Test 21
DC Gain Accuracy Test 29
Analog Bandwidth - Maximum Frequency Check 35
Time Scale Accuracy (TSA) 42
Performance Test Record 45
Testing Performance

18
This section documents performance test procedures. Performance verification for the
products covered by this manual consists of three main steps:
• Performing the internal product self-tests to ensure that the measurement system is
functioning properly
• Calibrating the product
• Testing the product to ensure that it is performing to specification
Performance Test Interval
The procedures in this section may be performed for incoming inspection and should
be performed periodically to verify that the oscilloscope is operating within
specification. The recommended test interval is once per year or after 2000 hours of
operation. Performance should also be tested after repairs or major upgrades.
Performance Test Record
A test record form is provided at the end of this section. This record lists performance
tests, test limits and provides space to record test results.
Test Order
The tests in this section may be performed in any order desired. However, it is
recommended to conduct the tests in the order presented in this manual as this
represents an incremental approach to performance verification. This may be useful if
you are attempting to troubleshoot a suspected problem.
Test Equipment
Lists of equipment needed to conduct each test are provided for each test procedure.
The procedures are written to minimize the number and types of oscilloscopes and
accessories required. The oscilloscopes in these lists are ones that are currently available
for sale by Agilent at the time of writing this document. In some cases, the test
procedures use features specific to the oscilloscopes in the recommended equipment
list. However, with some modification to the test procedures, oscilloscopes, cables and
accessories that satisfy the critical specifications in these lists may be substituted for
the recommended models with some modification to the test procedures.
Contact Agilent Technologies for more information about the Agilent products in these
lists.

Chapter 3: Testing Performance
Performing Self-Test and Calibration
19
Performing Self-Test and Calibration
1 Perform self tests
aPull down the Utilities menu and select Self Test.
bSelect Scope Self Test from the Self Test list.
cClick on Start Self Test to start the self test procedure.
If any of the self-tests fail, ensure that the failure is diagnosed and repaired before
calibrating and testing performance.
2
Perform calibration. See “To run the self calibration” on page 15.

20
Vertical Performance Verification
This section contains the following vertical performance verification:
• Offset Accuracy Test
• DC Gain Accuracy Test
• Analog Bandwidth Test