Tektronix AFG31000 Series User manual

AFG31000 Series Arbitrary Function Generator
Service Manual
tek.com
077179600

Copyright © Tektronix. All rights reserved. Licensed software products are owned by
Tektronix or its subsidiaries or suppliers and are protected by national copyright laws and
international treaty provisions.
Tektronix products are covered by U.S. and foreign patents, issued, and pending. Information
in this publication supersedes that in all previously published material. Specifications and
price change privileges reserved.
TEKTRONIX and TEK are registered trademarks of Tektronix, Inc.
Contacting Tektronix, Inc.
Tektronix, Inc.
14150 SW Karl Braun Drive
P.O. Box 500
Beaverton, OR 97077
USA
For product information, sales, service, and technical support:
-In North America, call 1-800-833-9200.
-Worldwide, visit tek.com to find contacts in your area.

Warranty
Tektronix warrants that the product will be free from defects in materials and workmanship for a period of
three (3) years from the date of original purchase from an authorized Tektronixdistributor. If the product
proves defective during this warranty period, Tektronix, at its option, either will repair the defective product
without charge for parts and labor or will provide a replacement in exchange for the defective product.
Batteries are excluded from this warranty. Parts, modules, and replacement products used by Tektronix
for warranty work may be new or reconditioned to like new performance. All replaced parts, modules and
products become the property of Tektronix.
In order to obtain service under this warranty, Customer mustnotify Tektronix of the defect before the
expiration of the warranty period and make suitable arrangements for the performance of service.
Customer shall be responsible for packaging and shipping the defective product tothe service center
designated by Tektronix, shipping charges prepaid, and with a copy of customer proof of purchase.
Tektronix shall pay for the return of the product toCustomer if the shipment is to alocation within the
country in which the Tektronix service center islocated. Customer shall be responsible for paying all
shipping charges, duties, taxes, and any other charges for products returned to anyother locations.
This warranty shall not apply to any defect, failure or damage caused by improper use or improper or
inadequate maintenance and care. Tektronix shall notbe obligated to furnish service under this warranty
a) torepair damage resulting from attempts by personnel other than Tektronix representatives toinstall,
repair or service the product; b) to repair damage resulting from improper use or connection to
incompatible equipment; c)to repair any damage or malfunction caused by the use of non-Tektronix
supplies; or d) toservice a product that has been modified or integrated with other products when the
effect of such modification or integration increases the time or difficulty of servicing the product.
THIS WARRANTY IS GIVEN BY TEKTRONIX WITH RESPECT TOTHE PRODUCT INLIEU OFANY
OTHER WARRANTIES, EXPRESS OR IMPLIED. TEKTRONIX AND ITS VENDORS DISCLAIM ANY
IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
TEKTRONIX' RESPONSIBILITY TO REPAIR ORREPLACE DEFECTIVE PRODUCTS IS THE SOLE
ANDEXCLUSIVE REMEDY PROVIDED TOTHE CUSTOMER FOR BREACH OFTHIS WARRANTY.
TEKTRONIX AND ITS VENDORS WILL NOT BE LIABLE FOR ANYINDIRECT, SPECIAL, INCIDENTAL,
ORCONSEQUENTIAL DAMAGES IRRESPECTIVE OF WHETHER TEKTRONIX OR THE VENDOR
HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES.
[W16 – 15AUG04]

AFG31000 Series Arbitrary Function Generator Service Manual
iv
Important safety information ...................................................................................................6
Important safety information .................................................................................................................6
General safety summary .......................................................................................................................6
To avoid fire or personal injury....................................................................................................................6
Terms in this manual.............................................................................................................................8
Service safety summary........................................................................................................................8
Symbols and terms on the product .......................................................................................................9
Service introduction ...............................................................................................................10
Getting started.....................................................................................................................................10
Contact information .............................................................................................................................10
General model information..................................................................................................................10
AFG31000 Series documentation.......................................................................................................10
Strategy for servicing ..........................................................................................................................12
Performance verification procedures ..................................................................................................12
Extended warranty ..............................................................................................................................12
Operating basics.....................................................................................................................13
Operating requirements ......................................................................................................................13
Check and protect connectors ............................................................................................................13
Floating ground ...................................................................................................................................15
Front-panel overview...........................................................................................................................16
Power the instrument ..........................................................................................................................17
Touchscreen interface.........................................................................................................................18
Protect your DUT ................................................................................................................................19
Perform diagnostics and calibration....................................................................................................20
Protection from overheating................................................................................................................22
Theory of operation ................................................................................................................23
Overview .............................................................................................................................................24
Platform section ..................................................................................................................................26
Generator section................................................................................................................................25
Adjustment procedures..........................................................................................................26
Adjustment procedures .......................................................................................................................26
Table of Contents

Table of Contents
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AFG31000 Series Arbitrary Function Generator Service Manual
Purpose.....................................................................................................................................................26
Equipment required...................................................................................................................................27
Performance conditions ............................................................................................................................27
Enable Service mode ................................................................................................................................28
Save Cal....................................................................................................................................................28
CAL Clear..................................................................................................................................................28
Reference clock ........................................................................................................................................28
Flatness adjustment ..................................................................................................................................29
Trigger delay adjustment...........................................................................................................................30
Burst external trigger adjustment ..............................................................................................................33
Delay ICadjustment..................................................................................................................................36
Resetting the serial number ......................................................................................................................38
Resetting the MAC address ......................................................................................................................38
Maintenance............................................................................................................................39
Maintenance........................................................................................................................................39
Service preparation ...................................................................................................................................39
Preventing ESD.........................................................................................................................................39
Preventative maintenance.........................................................................................................................39
Inspection and cleaning ............................................................................................................................40
Removal and installation........................................................................................................43
Removal and installation procedures..................................................................................................43
After repair adjustments ............................................................................................................................43
Before disassembly...................................................................................................................................43
Equipment required for disassembly .........................................................................................................43
Order of instrument disassembly...............................................................................................................44
Module rear case removal and installation................................................................................................44
Module rear chassis upper removal and installation .................................................................................46
Module rear chassis bottom removal and installation................................................................................47
Module front chassis removal and installation...........................................................................................49
Front-panel board: Power button, keypad, and LCD module removal and installation..............................50
BNC insulator board and signal generator board removal and installation................................................51
CPU board and power receptacle removal and installation.......................................................................53
Power supply and fan removal and installation .........................................................................................55
Diagrams...................................................................................................................................................59
Replaceable parts and modules................................................................................................................57
Troubleshooting .....................................................................................................................78
Troubleshooting ..................................................................................................................................78
Troubleshooting tools and equipment .......................................................................................................78
Troubleshooting trees ...............................................................................................................................78
Diagnostics................................................................................................................................................81

AFG31000 Series Arbitrary Function Generator Service Manual
vi
Important safety information
This manual contains information and warnings that must be followed by the user for safe operation
and to keep the product in a safe condition.
To safely perform service on this product, additional information is provided at the end of this section.
See Service safety summary.
General safety summary
Use the product only as specified. Review the following safety precautions to avoid injury and prevent
damage to this product or any products connected to it. Carefully read all instructions. Retain these
instructions for future reference.
Comply with local and national safety codes.
For correct and safe operation of the product, it is essential that you follow generally accepted safety
procedures in addition to the safety precautions specified in this manual.
The product is designed to be used by trained personnel only.
Only qualified personnel who are aware of the hazards involved should remove the cover for repair,
maintenance, or adjustment.
Before use, always check the product with a known source to be sure it is operating correctly.
This product is not intended for detection of hazardous voltages.
Use personal protective equipment to prevent shock and arc blast injury where hazardous live
conductors are exposed.
While using this product, you may need to access other parts of a larger system. Read the safety
sections of the other component manuals for warnings and cautions related to operating the system.
When incorporating this equipment into a system, the safety of that system is the responsibility of the
assembler of the system.
To avoid fire or personal injury
Use proper power cord. Use only the power cord specified for this product and certified for the
country of use. Do not use the provided power cord for other products.
Use proper voltage setting. Before applying power, make sure that the line selector is in the proper
position for the source being used or make sure the line voltage is corrected based on the published
specifications.
Ground the product. This product is grounded through the grounding conductor of the power cord.
To avoid electric shock, the grounding conductor must be connected to earth ground. Before making
connections to the input or output terminals of the product, make sure that the product is properly
grounded.
Important safety information

Important safety information
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AFG31000 Series Arbitrary Function Generator Service Manual
Do not disable the power cord grounding connection.
Power disconnect. The power cord disconnects the product from the power source. See instructions
for the location. Do not position the equipment so that it is difficult to operate the power cord; it must
remain accessible to the user at all times to allow for quick disconnection if needed.
Connect and disconnect properly. Do not connect or disconnect instruments while is connected to
a voltage source and. the instrument is powered on. Use only connectors and adapters supplied with
the product or indicated by Tektronix to be suitable for the product.
Observe all terminal ratings. To avoid fire or shock hazard, observe all ratings and markings on the
product. Consult the product manual for further ratings information before making connections to the
product. Do not exceed the Measurement Category (CAT) rating and voltage or current rating of the
lowest rated individual component.
Do not apply a potential to any terminal, including the common terminal, that exceeds the maximum
rating of that terminal.
Do not float the common terminal above the rated voltage for that terminal.
Do not operate without covers. Do not operate this product with covers or panels removed, or with
the case open. Hazardous voltage exposure is possible.
Avoid exposed circuitry. Do not touch exposed connections and components when power is
present.
Do not operate with suspected failures. If you suspect that there is damage to this product, have it
inspected by qualified service personnel before using this product.
Disable the product if it is damaged. Do not use the product if it is damaged or operates incorrectly. If
in doubt about the safety of the product, turn it off and disconnect the power cord. Clearly mark the
product to prevent its further operation.
Examine the exterior of the product before you use it. Look for cracks or missing pieces.
Use only specified replacement parts.
Wear eye protection. Wear eye protection if exposure to high-intensity rays or laser radiation exists.
Do not operate in wet or damp conditions. Be aware that condensation may occur if a unit is
moved from a cold environment to a warm environment.
Do not operate in an explosive atmosphere.
Provide proper ventilation. Refer to the installation instructions in the manual for details on installing
the product so it has proper ventilation.
Slots and openings are provided for ventilation and should never be covered or otherwise obstructed.
Do not push objects into any of the openings.
Provide a safe working environment. Always place the product in a location convenient for viewing
the display and indicators.

Important safety information
AFG31000 Series Arbitrary Function Generator Service Manual
iix
Avoid improper or prolonged use of keyboards, pointers, and button pads. Improper or prolonged
keyboard or pointer use may result in serious injury.
Be sure your work area meets applicable ergonomic standards. Consult with an ergonomics
professional to avoid stress injuries.
Use care when lifting and carrying the product. This product is provided with handles for lifting and
carrying.
Use only the Tektronix rack-mount hardware specified for this product.
Keep product surfaces clean and dry. Remove the input signals before you clean the product.
Inspect the instrument as often as operating conditions require. To clean the exterior surface, perform
the following steps:
1. Remove loose dust on the outside of the instrument with a lint-free cloth. Use care to avoid
scratching the clear glass display filter.
2. Use a soft cloth dampened with water to clean the instrument. Use an aqueous solution of 75%
isopropyl alcohol for more efficient cleaning.
CAUTION. Avoid getting moisture inside the unit during external
cleaning. Use only enough cleaning solution to dampen the cloth or
swab. To avoid damage to the instrument, do not expose it to sprays,
liquids, or solvents, and do not use any abrasive or chemical cleaning
agents.
Terms in this manual
These terms may appear in this manual:
WARNING.
Warning statements identify conditions or practices that
could result in injury or loss of life.
CAUTION. Caution statements identify conditions or practices that
could result in damage to this product or other property.
Service safety summary
This section contains additional information required to safely perform service on the product. Only
qualified personnel should perform service procedures. Read this Service safety summary and the
General safety summary before performing any service procedures.
To avoid electric shock. Do not touch exposed connections.
Do not service alone. Do not perform internal service or adjustments of this product unless another
person capable of rendering first aid and resuscitation is present.

Important safety information
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AFG31000 Series Arbitrary Function Generator Service Manual
Disconnect power. To avoid electric shock, switch off the product power and disconnect the power
cord from the mains power before removing any covers or panels, or opening the case for servicing.
Use care when servicing with power on. Dangerous voltages or currents may exist in this product.
Disconnect power, remove battery (if applicable), and disconnect test leads before removing
protective panels, soldering, or replacing components.
Verify safety after repair. Always recheck ground continuity and mains dielectric strength after
performing a repair.
Symbols and terms on the product
These terms may appear on the product:
DANGER indicates an injury hazard immediately accessible as you read the marking.
WARNING indicates an injury hazard not immediately accessible as you read the marking.
CAUTION indicates a hazard to property including the product.
When this symbol is marked on the product, be sure to
consult the manual to find out the nature of the
potential hazards and any actions which must be taken
to avoid them. (This symbol may also be used to refer
the user to ratings in the manual.)
The following symbol(s) may appear on the product:

AFG31000 Series Arbitrary Function Generator Service Manual
10
Getting started
Thank you for choosing a Tektronix product. The AFG31000 Series Arbitrary Function Generator
(AFG) instruments are high-performance instruments with built-in waveform generation applications,
real-time waveform monitoring called InstaViewTM, and an improved user interface for higher test
efficiency.
Contact information
If you have any questions after you review the information in this documentation, please contact your
local Tektronix office, sales partner, or distributor. You can also call the corporate headquarters of
Tektronix in North America at 1-800-833-9200. Visit tek.com to find contacts in your area.
General model information
This manual provides operation information for the following products. Unless otherwise noted,
AFG31000 Series refers to the models in the following table.
Table 1: AFG31000 models
Model Bandwidth Sample rate Channel Waveform
memory size
Optional
AFG31021
25 MHz
250 MS/s
1
16 MS/CH
128 MS/CH
AFG31022
25 MHz
250 MS/s
2
16 MS/CH
128 MS/CH
AFG31051
50 MHz
1 GS/s
1
16 MS/CH
128 MS/CH
AFG31052
50 MHz
1 GS/s
2
16 MS/CH
128 MS/CH
AFG31101
100 MHz
1 GS/s
1
16 MS/CH
128 MS/CH
AFG31102
100 MHz
1 GS/s
2
16 MS/CH
128 MS/CH
AFG31151
150 MHz
2 GS/s
1
16 MS/CH
128 MS/CH
AFG31152
150 MHz
2 GS/s
2
16 MS/CH
128 MS/CH
AFG31251
250 MHz
2 GS/s
1
16 MS/CH
128 MS/CH
AFG31252
250 MHz
2 GS/s
2
16 MS/CH
128 MS/CH
Each AFG31000 Series provides:
25 MHz to 250 MHz function signal generator
20 MHz to 160 MHz pulse generator
The AFG31000 Series also provides 14-bit vertical resolution.
AFG31000 Series documentation
Complete documentation for the instruments is available at tek.com. The following table is a complete
list of available documentation.
Service introduction

Service introduction
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AFG31000 Series Arbitrary Function Generator Service Manual
Table 2: AFG31000 documentation
Document name Available languages Document number Document description
Instructions
Compliance and
Safety Instructions
English
0713606xx
This document contains compliance
and safety information for the
AFG31000 Series Arbitrary Function
Generator.
French
0713613xx
German
0713615xx
Italian
0713614xx
Japanese
0713617xx
Korean
0713621xx
Portuguese
0713618xx
Russian
0713622xx
Simplified Chinese
0713619xx
Spanish
0713616xx
Traditional Chinese
0713620xx
AFG31000 Series
Arbitrary Function
Generator User's
Manual
English
0771473xx
This document describes operation
and installation procedures for all
models of the AFG31000 Series
Arbitrary Function Generator. It
includes information about features,
functions, and accessories.
Japanese
0771478xx
Simplified Chinese
0771479xx
Traditional Chinese
0771480xx
German
0771481xx
French
0771482xx
Russian
0771486xx
Korean
0771487xx
AFG31000 Series
Arbitrary Function
Generator
Programmer's
Manual
English
0771488xx
This document provides information
required to use programmable
interface commands for the
AFG31000 Series Arbitrary Function
Generator.
AFG31000 Series
Arbitrary Function
Generator
Specification and
Performance
Verification
Technical Reference
English
0771489xx
This document describes
specifications and performance
verification procedures for the
AFG31000 Series Arbitrary Function
Generator.
AFG31000 Series
Arbitrary Function
Generator
Declassification &
Security Instructions
English
0771491xx
This document includes information
that is necessary to clear or sanitize
the product so it can be removed
from a secured area, such as when
returning the product for repair.
Series 31000
ArbExpress
Printable Help
English
0771492xx
This online help provides information
on how to create, edit, and transfer
standard waveforms to an arbitrary
waveform generator, an arbitrary
function generator, or an
oscilloscope.
AFG31000 Series
Arbitrary Function
Generator Release
Notes
English
0771493xx
Release notes
NOTE: XX in a part number replaces the document revision number.

Service introduction
AFG31000 Series Arbitrary Function Generator Service Manual
12
Strategy for servicing
This manual contains information for periodic maintenance of your arbitrary function generator.
Further, it contains information for corrective maintenance down to the module level:
To isolate a failure of a module, use the troubleshooting procedures found in the Maintenance
section.
To remove and replace a failed module, follow the instructions in the Removaland installation
procedures section.
After isolating a faulty module, replace it with a fully-tested module obtained from the factory.
The Replaceable parts andmodules list section contains partnumbers and ordering
information for all replaceable modules.
Performance verification procedures
The performance verification procedures are provided in the AFG31000 Series Specifications and
Performance Verification Technical Reference and should be performed every 12 months.
If the instrument does not meet the performance criteria, repair is necessary (refer to Contact
information for information regarding how to contact the appropriate personnel).
Extended warranty
Additional years of warranty coverage are available on many products. These valuable contracts
protect you from unbudgeted service expenses and provide additional years of protection at a fraction
of the price of a repair. Extended warranties are available on new and existing products. Contact your
local Tektronix office, sales partner, or distributor for details (refer toContact information for details).

AFG31000 Series Arbitrary Function Generator Service Manual
13
Operating requirements
Use the following information to safely install your instrument.
To operate your instrument:
1. Place the instrument on a cart or bench, observing clearance requirements of 50 mm (2 in.) from
the sides and rear.
2. Before operating, make sure that the ambient temperature is between 0 °C to +50 °C (+32 °F to
+122 °F).
CAUTION. To make sure that the instrument has the appropriate cooling, keep both sides of the
instrument clear of obstructions.
Check and protect connectors
The source voltage and frequency should be between 100 V to 240 V and 47 Hz to 63 Hz.
The instrument will also support 115V, 360-440Hz.
WARNING. To reduce the risk of fire and shock that may cause personal injury or death, make sure
that the mains supply voltage fluctuations do not exceed 10% of the operating voltage range.
To check input and output connectors:
1. Locate the output connectors on the front panel.
2. Locate the input connectors on the front panel.
NOTE: When connecting a cable, make sure to distinguish the input connector from the output
connectors to avoid making the wrong connection.
Operating basics

Operating basics
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AFG31000 Series Arbitrary Function Generator Service Manual
Figure 1: AFG31000 Series front-panel inputs and outputs
The instrument input and output connectors are floating inputs and outputs (see Floating ground for
moreinformation).
WARNING. To avoid personal injury or death due to electric shock, do not apply voltages in excess
of 42 Vpk to any BNC connector ground or to the chassis ground.
CAUTION. Do not short output pins or apply external voltages to output connectors, because this
will cause damage to your instrument. Also, do not apply more than +5 V to the Trigger Input
connector, which may cause damage to your instrument.

Operating basics
AFG31000 Series Arbitrary Function Generator Service Manual
15
Floating ground
Because the common ground (input and output channel common) of the AFG31000 Series is
electrically isolated from the chassis ground (the instrument chassis and ground line of the ac
connector), you can make a floating connection between the instrument and other equipment.
All the signal output connectors are connected to the common ground, and the remote interface
connector is connected to the chassis ground.
WARNING. To avoid personal injury due to electric shock, use this product so that the sum of the
floating voltage and the output voltage of the instrument does not exceed 42 Vpk. Do not touch the
center of the BNC connector while the equipment and instrument are in use.
CAUTION. The maximum rated voltage between the chassis ground and common ground is 42 V
pp
(dc + peak ac). When the potential voltage between the chassis ground and common ground goes
over 42 Vpp, the internal protective circuit is activated to protect the circuits. However, voltages
continuously exceeding 42 Vpp may cause the internal circuits in the instrument to be damaged.
When a potential voltage exists between the chassis ground and common ground, a short circuit
from output to ground causes the instrument internal fuse to open and the output is stopped. If the
fuse opens, you need to contact your local Tektronix Service Support. When a potential voltage
exists between the common ground and chassis ground, short-circuiting between them may lead to
excessive current flow and the internal or external circuits may be damaged.
Figure 2: AFG31000 Series floating ground

Operating basics
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AFG31000 Series Arbitrary Function Generator Service Manual
Front-panel overview
The following figure shows the front panel of a dual-channel model.
Figure 3: AFG31000 Series front-panel overview
1. Power switch
2. Touchscreen
3. Shortcut buttons: Frequency/Period, Amplitude/High, Phase/Delay, Offset/Low
4. Waveform function keys: Sine, Ramp, Arb, Square, Pulse, and More
5. Basic Mode buttons: Continuous, Sweep, Modulation, and Burst
6. Advanced Mode keys: Sample, Rate, and Run
7. Setup buttons: Default, Save/Recall, Touch Off, Utility, and Help
8. InstaView (real-time waveform measurement) button
9. Navigation area: Navigation control (turn the control to change the number of parameter that is
selected); Home key (takes you to the initial power on screen); Back key (use to switch between
AFG, Advanced Mode, ArbBuilder, Help, and Utility); left and right arrow keys (when editing a
setting, moves the cursor to the left or the right)
10. Cancel, Bksp (backspace), Delete, and Enter buttons (use with the numeric keypad)
11. Settings edit buttons: G/n, M/μ, k/m, and x1 buttons (use when editing a setting)
12. Numeric keypad
13. Trigger button, LEDs, and connectors
14. Channel buttons and connectors
15. USB input (Type A connector)
NOTE: Shortcut keys are provided for advanced users. The shortcut keys allow you to select a setting
and enter a numeric value using the front-panel controls or the touchscreen.

Operating basics
AFG31000 Series Arbitrary Function Generator Service Manual
17
Power the instrument
The following procedure shows you how to connect the instrument to power and turn it on and off.
Connect the power cord:
1. Make sure the front-panel power switch is in the off position.
2. Connect the female end of the supplied power cord to the ac receptacle on the rear panel.
3. Connect the male end of the power cord to a grounded ac outlet.
To power on the instrument:
Press the front-panel power switch to turn on the instrument.
Figure 4: AFG31000 Series two-channel front view
NOTE: Wait until the front-panel display shows that the instrument has passed all power-on self-tests
before using the instrument.

Operating basics
18
AFG31000 Series Arbitrary Function Generator Service Manual
Touchscreen interface
The following figures describe the touchscreen main display.
Figure 5: Touchscreen main display

Operating basics
AFG31000 Series Arbitrary Function Generator Service Manual
19
Protect your DUT
Use caution when you connect the instrument channel output to your device under test (DUT). To
avoid damage to your DUT, follow the steps below to set the limit values for high level and low level.
To protect your DUT:
1. Make note of the CH1 or CH2 high voltage and low voltage.
2. Swipe the bottom area up and select Ch1 or Ch2.
3. Make sure that the limits are set appropriately for the device under test (DUT).
Default high limit: 500 mV
Default low limit: –500 mV
Figure 6: High and low voltage limits

Operating basics
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AFG31000 Series Arbitrary Function Generator Service Manual
Perform diagnostics and calibration
When powering on the instrument, it performs a limited set of hardware tests. You can also run the
following manual diagnostic and calibration functions from the Utility menu (see Utility menu options
for more detail). This procedure uses internal routines to verify that the instrument is operating
correctly.
Diagnostics (self-test): Perform diagnostics to verify that your instrument is operating
correctly.
Calibration (self-calibration): The calibration function checks dc accuracy using the internal
calibration routines.
Figure 7: Diagnostics and calibration