Keysight 90000 X Series User manual

Keysight Infiniium
90000 X/L-Series Oscilloscopes
Service Guide

Service Guide
Publication Number 54916- 97010
May 2015
© Keysight Technologies, Inc. 2011- 2015
Infiniium 90000 X / L- Series
Oscilloscopes

4
Keysight Infiniium 90000 X-Series Oscilloscopes at a Glance
Ease of use with high performance
The Keysight Infiniium 90000 X-Series
oscilloscopes combine unprecedented ease-of-
use with high-performance digitizing
oscilloscope functionality to simplify your design
and analysis measurement tasks.
• Traditional oscilloscope front-panel interface
provides direct access to the controls needed
for most troubleshooting tasks.
• Graphical user interface with menus,
windows, dialog boxes, and toolbars provides
easy access to dozens of configuration and
analysis tools, ensuring you can set up and
make the most complex measurements.
• Models with bandwidths from 13 GHz to
32 GHz.
• MSO models provide 10 GSa/s at 16 channels
and 20 GSa/s at 8 channels.
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 are
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
• 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 oscilloscope 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.
Solid state 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.
• Solidstatedrivestoresoscilloscopeoperating
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
• 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 information for the Keysight Technologies 90000 X-
Series and 90000 L-Series oscilloscopes. It is divided into seven chapters.
Chapter 1, "General Information," describes which oscilloscope models are covered by
this guide, supplied accessories, and where to find the specifications for the 90000 X-
Series / 90000 L- Series oscilloscopes.
Chapter 2, "Calibration," describes the types of calibrations, and how and when to run
the user calibration procedure.
Chapter 3, "Testing Performance," provides instructions for testing the oscilloscope to
verify that it performs according to specifications.
Chapter 4, "Troubleshooting," provides flowcharts and procedures for diagnosing
problems for assembly- level repair.
Chapter 5, "Replacing Assemblies," provides instructions for removing and replacing
assemblies in the oscilloscope.
Chapter 6, "Replaceable Parts," provides exploded parts diagrams and a list for ordering
replaceable parts.
Chapter 7, "Theory of Operation," describes the basic structure of the oscilloscope and
how its parts interact.
At the back of the book you will find safety notices.

6

1
Instruments covered by this service guide 8
Accessories supplied 9
Specifications and Characteristics 9
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 Keysight Technologies website at www.keysight.com to see whether a
newer version of this manual is available.
The following 90000 X- Series and L- Series oscilloscopes are covered in this guide.
The oscilloscope model can be identified by the product number on the front or
rear panel.
Model Bandwidth
MSOX/DSOX/DSAX91304A 13 GHz bandwidth
MSOX/DSOX/DSAX91604A 16 GHz bandwidth
MSOX/DSOX/DSAX92004A 20 GHz bandwidth
MSOX/DSOX/DSAX92504A 25 GHz bandwidth
MSOX/DSOX/DSAX92804A 28 GHz bandwidth
DSO/DSA93004L 30 GHz bandwidth
MSOX/DSOX/DSAX93204A 32 GHz bandwidth

Chapter 1: General Information
Accessories supplied
9
Accessories supplied
The following accessories are supplied.
•Mouse
•Stylus
•Keyboard
• Accessory pouch
• Front panel cover
•Calibration cable
• Connector saver collars (qty 10)
• Connector savers (f- f) (qty 5)
• Power cord (see parts list in chapter 6 for country- dependent part number)
•ESD wrist strap
• Digital channels cable (MSO models only): Keysight part number N2815- 68701
• MSO calibrator board assembly (MSO models only): Keysight part number N2834- 68703
Specifications and Characteristics
The following table contains a partial list of specifications and characteristics for the
Keysight Infiniium 90000 X- Series oscilloscopes. For a full list of specifications and
characteristics, see the data sheets at www.keysight.com/find/90000x- series.
Specifications that are pertinent to each test are 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 Operating: up to 4,000 m (12,000 feet)
Non-operating: up to 15,300 meters (50,000 feet)
Installation/
Measurement
Category
Installation category: II
Measurement category: 1
Power Requirements 100-240 V, 47-63 Hz; 800 W for 4-channel models.
100-240 V, 50 Hz;100-208 V, 50/60 Hz; 800 W for 8-channel models.
Voltage Fluctuations Note that the mains supply voltage fluctuations are not to exceed +/-10% of the
nominal supply voltage.
Pollution Degree The Infiniium 90000 X-Series oscilloscopes may be operated in environments of
Pollution Degree 2.

Chapter 1: General Information
Specifications and Characteristics
10
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.

2
Running a Self Calibration 11
Calibration

12
Calibration
A calibration is simply an oscilloscope self-adjustment. The purpose of a calibration is
performance optimization.
There are four levels of calibrating an Infiniium 90000 X- Series oscilloscope, with each
successive level being a superset of the previous one:
•Anenvironmental calibration is a quick fine- tune of response. It includes a minimum
set of calibrations and should be run when there are changes to the operating
environment around the oscilloscope, such as changes in air flow, temperature,
humidity, or the placement of other instruments near the oscilloscope. It can also be
run prior to making critical measurements where absolute best accuracy is required.
The environmental calibration takes only a few minutes to run, and is easily accessible
through a button in the Calibration dialog box. Users can run this cal.
•A user calibration, also known as a self calibration, is a more rigorous set of cals
that can be run by oscilloscope users. It includes the environmental cal.
With a user calibration, you may optionally choose to run time scale calibrations
and interleave correction calibrations. These cals do not run by default, and they
require additional equipment. A user calibration takes about 2- 1/4 hours, including
the time required to change cables from channel to channel.
•A service calibration is performed only by Keysight Service Center technicians. With
a service calibration the 50 Ohm input resistance calibration is performed, in addition
to everything calibrated with the user calibration. The time scale and interleave
correction calibrations are run by default, though they can be turned off. Additional
equipment is required to run a service calibration. A service calibration takes about
2- 1/2 hours.
•A factory calibration includes the complete set of calibrations, including time scale
and interleave correction, plus other calibrations. A factory calibration is normally
performed once, during production of the oscilloscope. All of the calibration factors
are stored into flash RAM on the acquisition board so that the calibration factors
determined by the factory calibration are preserved even if the hard drive is replaced
or reformatted.

Chapter 2: Calibration
Running an Environmental Calibration
13
Running an Environmental Calibration
The environmental calibration uses signals generated in the oscilloscope to calibrate
response.
When to perform an environmental calibration:
• You can perform a quick environmental cal rather than a full user cal when there
are changes to the operating environment around the oscilloscope, such as changes
in air flow, temperature, humidity, or the placement of other instruments near the
oscilloscope. For example, you would run the quick environmental cal if the
oscilloscope is moved to a test rack or chamber.
Equipment Required
Procedure
1Let the oscilloscope warm up before running the self calibration.
The environmental calibration should be done only 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.
2Select Utilities >Calibration.
3Uncheck the Cal Memory Protect box.
You cannot run a self calibration if this box is checked. See Figure 2- 2.
Figure 2-1 Calibration Dialog Box
Let the Oscilloscope Warm Up Before Adjusting
Warm up the oscilloscope for 30 minutes at ambient temperature beforestartingthecalibration procedure.
Failure to allow warm up may result in inaccurate calibration.
Equipment Critical Specifications Keysight Part Number
Connector savers (5 supplied with
oscilloscope) 3.5mm (f) to 3.5 mm (f) Keysight 54916-68717 (for 20, 25, 28, 30, and 32 GHz models)
Keysight 54916-68716 (for 13 GHz
and 16 GHz models)
Cable (supplied with oscilloscope) No substitute Keysight 54916-61626
Clear this check box
before beginning
calibration
Click here to run
quick environmen
calibration

Chapter 2: Calibration
Running an Environmental Calibration
14
4Click Start Quick Env Cal, then follow the instructions on the screen. The routine will
prompt you to follow these steps:
aDisconnect everything from all inputs and Cal Out.
bConnect the calibration cable from Cal Out to channel 1. You must use the 54916-
61626 cable assembly with two connector saver adapters for all oscilloscopes.
Failure to use the appropriate calibration cable will result in an inaccurate
calibration.
cConnect the calibration cable from Cal Out to each of the channel inputs as
requested.
dA Passed/Failed indication appears for each calibration section. If any section
fails, click the Enable Details box for information on the failures. Also check
the calibration cables.

Chapter 2: Calibration
Running a user calibration
15
Running a user calibration
The user calibration uses signals generated in the oscilloscope to calibrate channel scale,
offsets, and trigger parameters. When running a user calibration, you can choose to run
optional time scale and interleave response correction calibrations.
If your oscilloscope is an MSO model or has been upgraded to add MSO capability, you
can choose to calibrate only the digital channels rather than both the analog and digital
channels.
When to perform a user calibration:
• When it has been more than 1 year since the last time scale calibration, perform the
time scale portion.
• When you replace the hard drive.
• 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, perform the interleave
response correction portion.
Equipment Required
Procedure
1Let the oscilloscope warm up before running the self calibration.
The self calibration should be done only 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.
2Select Utilities >Calibration.
3Uncheck the Cal Memory Protect box. You cannot run a self calibration if this box is
checked. See Figure 2- 2.
Let the Oscilloscope Warm Up Before Adjusting
Warm up the oscilloscope for 30 minutes before starting the calibration procedure. Failure to allow warm
up may result in inaccurate calibration.
Equipment Critical Specifications Keysight Part Number
Connector savers (5 supplied
with oscilloscope) 3.5mm (f) to 3.5 mm (f) Keysight 54916-68717(for 20, 25, 28, 30, and 32 GHz models)
Keysight 54916-68716 (for 13 GHz
and 16 GHz models)
Cable assembly 50 Ohm characteristic impedance BNC
(m) connectors, 36 inches (91 cm) to 48
inches (122 cm) long
Keysight 8120-1840
Adapter SMA(m) to BNC(f) Keysight 1250-1200
Cable (supplied with
oscilloscope) No substitute Keysight 54916-61626
Digital channels cable (MSO
models only) No substitute Keysight N2815-68701
MSO calibrator (MSO models
only) No substitute Keysight N2834-68703

Chapter 2: Calibration
Running a user calibration
16
Figure 2-2 Calibration Dialog Box
4Click Start Full User Cal, then follow the instructions on the screen. The routine will
prompt you to follow these steps:
aDisconnect everything from all inputs and Cal Out.
bIndicate whether you want to run time scale and interleave response correction
calibrations. For a list of equipment required to perform the time scale calibration,
refer to the “Time Scale Accuracy (TSA) Test” section in the next chapter. The
interleave correction calibration requires a sine wave generator and a ≥ 67 GHz
cable with 1.85 mm male connectors on each end. You will also need to use the
two supplied 1.85 mm (f)- (f) connector savers. To learn more about both
calibration options, click Help from the Calibration Options dialog box.
cConnect the calibration cable from Cal Out to channel 1. You must use the 54916-
61626 cable assembly with two connector saver adapters for all oscilloscopes.
Failure to use the appropriate calibration cable will result in an inaccurate
calibration.
dConnect the calibration cable from Cal Out to each of the channel inputs as
requested.
eWhen instructed, connect the calibration cable from the Cal Out on the front
panel of the oscilloscope to the 1250- 1200 SMA(m) to BNC(f) adapter and then
connect the other end of the 1250- 1200 adapter to the 8120- 1840 BNC cable.
Connect the other end of the BNC cable to the Trig In on the rear of the
oscilloscope.
fA Passed/Failed indication appears for each calibration section. If any section
fails, click the Enable Details box for information on the failures. Also check
the calibration cables.
5If you are calibrating an MSO model oscilloscope, follow the prompts to connect the
digital channels cable to the digital channels connector on the rear of the oscilloscope
and to the calibration connector on the MSO calibrator.
CAUTION Be sure to orient the digital channels cable with the Keysight part number facing
downward as shown on the rear of the oscilloscope. See Figure 2- 3.
Clear this check box
before beginning
calibration
Click here to start
a user calibration

Chapter 2: Calibration
Running a user calibration
17
Figure 2-3 Digital channels cable orientation
CAUTION Insert the digital channels cable carefully into the MSO calibrator to prevent damage
to the pins. Use the notches on the cable and the MSO calibrator to orient the cable
correctly. See Figure 2- 4.
Figure 2-4 MSO calibrator
6After the calibration procedure is completed, click Close.
Alignment notches

Chapter 2: Calibration
Running a user calibration
18

3
Vertical Performance Verification 21
Offset Accuracy Test 22
DC Gain Accuracy Test 29
Analog Bandwidth - - Maximum Frequency Test 34
Time Scale Accuracy (TSA) Test 41
Performance Test Record 43
Testing Performance

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This section describes performance test procedures.
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 and test limits, and provides space to record test results.
Test Order
The tests in this section may be performed in any order. 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 Keysight 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, the 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 Keysight Technologies for more information about the Keysight products in
these lists.