Service Manual
TLA Series
Digitizing Oscilloscope Modules
(TLA7D1, TLA7D2, TLA7E1, & TLA7E2)
070-9780-03
This document applies to firmware version 1.00
and above.
Warning
The servicing instructions are for use by qualified
personnel only. To avoid personal injury, do not
perform any servicing unless you are qualified to
do so. Refer to all safety summaries prior to
performing service.
www.tektronix.com
Copyright © Tektronix, Inc. All rights reserved.
Tektronix products are covered by U.S. and foreign patents, issued and pending. Information in this publication supercedes
that in all previously published material. Spec ifications and price change privileges reserved.
Tektronix, Inc., 14200 SW Karl Braun Drive, Beaverton, OR 97077
TEKTRONIX and TEK are registered trademarks of Tektronix, Inc.
WARRANTY
Tektronix warrants that the products that it manufactures and sells will be free from defects in materials and workmanship
for a period of one (1) year from the date of shipment. If a 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.
In order to obtain service under this warranty, Customer must notify 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 to the service center de signated by Tektronix, with shipping charges prepaid.
Tektronix shall pay for the return of the product to Customer if the shipment is to a location within the country in which the
Tektronix service center is located. Customer shal l be responsible for payi ng all shipping charges, duties, taxes, and any
other charges for products returned to any other 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 not be obligated to furnish service under this warranty a) to repair damage resulting
from attempts by personnel other than Tektronix representatives to install, repair or service the product; b) to repair
damage resulting from improper use or connec tion to incompatible equipment; c) to repair any da mage or malfunction
caused by the use of non-Tektronix supplies; or d) to service 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 W ARRANTY IS GIVEN BY TEKTRONIX IN LIEU OF ANY 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 OR REPLACE DEFECTIVE PRODUCTS IS THE SOLE AND EXCLUSIVE REMEDY PROVIDED TO
THE CUSTOMER FOR BREACH OF THIS W ARRANTY. TEKTRONIX AND ITS VENDORS WILL NOT BE
LIABLE FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES IRRESPECTIVE
OF WHETHER TEKTRONIX OR THE VENDOR HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH
DAMAGES.
Table of Contents
Specifications
Operating Information
General Safety Summary v...................................
Service Safety Summary vii....................................
Preface ix...................................................
Manual Structure ix................................................
Manual Conventions x..............................................
Related Manuals x.................................................
Introduction xiii..............................................
Adjustment and Certification Interval xiii................................
Strategy for Servicing xiii.............................................
Service Offerings xiv................................................
Contacting Tektronix xv.............................................
Product Description 1--1..............................................
Characteristics Tables 1--2.............................................
Installation 2--1.....................................................
Software Installation and Removal 2--4..................................
Operating Information 2--6............................................
Theory of Operation
Block Level Description 3--1...........................................
Performance Verification
Summary Verification 4--1.............................................
Test Equipment 4--3..................................................
Functional Verification 4--4............................................
DSO Module Certification 4--7.........................................
Performance Verification Instructions 4--7................................
Performance Verification Tests 4--13.....................................
Adjustment Procedures
Prerequisites 5--1....................................................
Using the Software 5--2...............................................
Test Equipment 5--3..................................................
Adjustment Instructions 5--4...........................................
Adjustment Procedures 5--5............................................
Completing the Adjustment Steps 5--14...................................
Maintenance
Related Maintenance Procedures 6--1....................................
TLA Series Digitizing Oscilloscope Modules Service Manual
i
Table of Contents
Preventing ESD 6--1.................................................
Battery Disposal 6--2.................................................
Inspection and Cleaning 6--2...........................................
Removal and Installation Procedures 6--7.........................
Summary of Procedures 6--7...........................................
Tools Required 6--8..................................................
Injector/Ejector Handles 6--8...........................................
Cover 6--10..........................................................
Processor Board 6--13.................................................
Probe Compensation BNC Connector 6--16................................
Fuses 6-- 17..........................................................
Probe Interface 6--19..................................................
Acquisition Board 6--22................................................
Rear EMI Gaskets 6 --23................................................
Troubleshooting 6--25...........................................
Check for Common Problems 6--26......................................
Eliminate Other Problem Sources 6--26...................................
Troubleshoot the DSO Module 6--27......................................
Adjustment After Repair 6--34..........................................
Repackaging Instructions 6--35...................................
Packaging 6--35......................................................
Storage 6--35........................................................
Options
Tektronix Service Options 7--1.........................................
Replaceable Electrical Parts
Diagrams
Replaceable Mechanical Parts
Standard Accessories 10--1.............................................
Parts Ordering Information 10--1.........................................
Using the Replaceable Parts List 10--3....................................
ii
TLA Series Digitizing Oscilloscope Modules Service Manual
List of Figures
Table of Contents
Figure 2--1: Logical address switches 2--2..........................
Figure 2--2: Module retainer screws and ejector mechanism 2--3......
Figure 2--3: Digitizing oscilloscope front panel 2--6..................
Figure 2--4: Typical system window 2--8...........................
Figure 4--1: Calibration/certification procedure flow chart 4--2.......
Figure 4--2: Calibration and Diagnostics property sheet 4--5..........
Figure 4--3: Initial setup for the DC gain accuracy test 4--14...........
Figure 4--4: Initial setup for the analog bandwidth test 4--16...........
Figure 4--5: Using a power meter to monitor the amplitude of the
sine wave generator during the analog bandwidth test 4--17........
Figure 4--6: Initial setup for the delay between channels test 4--19......
Figure 4--7: Initial setup for the timebase accuracy test 4--20..........
Figure 4--8: Initial setup for the main trigger accuracy test 4--22.......
Figure 4--9: Initial setup for the main trigger sensitivity test 4--23......
Figure 4--10: Initial setup for the probe compensation test 4--24........
Figure 5--1: Initial setup for the base calibration adjustment 5--6......
Figure 5--2: Initial setup for the frequency response adjustment 5--8...
Figure 5--3: Using a power meter to monitor the amplitude of the
sine wave generator during the frequency response adjustment 5--9
Figure 5--4: Initial setup for the channel-to-channel skew adjustment 5--12
Figure 5--5: Initial setup for the probe compensation test 5--13.........
Figure 6--1: Injector/ejector handle replacement 6--9................
Figure 6--2: Cover removal 6--10..................................
Figure 6--3: Seating the cover on the chassis 6--12....................
Figure 6--4: Processor board removal 6--14.........................
Figure 6--5: Inserting processor board tab into front subpanel 6--15....
Figure 6--6: BNC replacement 6--16...............................
Figure 6--7: Fuse replacement 6--18................................
Figure 6--8: Probe interface replacement 6--20.......................
Figure 6--9: Acquisition board replacement 6--22....................
Figure 6--10: Rear EMI gasket removal 6--23........................
Figure 6--11: Rear EMI gasket replacement 6--24....................
TLA Series Digitizing Oscilloscope Modules Service Manual
iii
Table of Contents
List of Tables
Figure 6--12: Primary troubleshooting procedure 6--30...............
Figure 6--13: Probe power voltage check 6--31.......................
Figure 6--14: Power supply troubleshooting procedure 6--31...........
Figure 6--15: Fuse locations for troubleshooting 6--32.................
Figure 6--16: Probe interface resistance 6--33........................
Figure 9--1: Interconnections 9--1................................
Figure 9--2: Block diagram 9--2..................................
Figure 10--1: Digitizing oscilloscope exploded view 10--8..............
Table i: Tektronix Logic Analyzer Family Documentation xi.......
Table 1--1: Comparison of product features 1--1....................
Table 1--2: Signal acquisition system 1--2.........................
Table 1--3: Timebase system 1--5.................................
Table 1--4: Trigger system 1--6..................................
Table 1--5: Front-Panel Connectors 1--7..........................
Table 1--6: Environmental 1--7..................................
Table 1--7: Certifications and compliances 1--8.....................
T able 1--8: Mechanical 1--8.....................................
Table 4--1: Test Equipment 4--3.................................
T able 4--2: DSO PV/Adjust software performance verification tests 4--8
Table 4--3: DSO module fault isolation 4--12........................
Table 5--1: DSO Adjustments and dependencies 5--3................
Table 5--2: Fault isolation 5--5...................................
T able 6--1: External inspection check list 6--4......................
T able 6--2: Internal inspection check list 6--5......................
T able 6--3: Tools required for parts replacement 6--8................
Table 6--4: Failure symptoms and possible causes 6--26...............
Table 6--5: Power supply fault-location table 6--32...................
Table 6--6: Diagnostic tests 6--33..................................
T able 10--1: Standard accessories 10--1............................
iv
TLA Series Digitizing Oscilloscope Modules Service Manual
General Safety Summary
Review the following safety precautions to avoid injury and prevent damage to
this product or any products connected to it. To avoid potential hazards, use this
product only as specified.
Only qualified personnel should perform service procedures.
While using this product, you may need to access other parts of the system. Read
the General Safety Summary in other system manuals for warnings and cautions
related to operating the system.
ToAvoidFireor
Personal Injury
Use Proper Power Cord. Use only the power cord specified for this product and
certified for the country of use.
Connect and Disconnect Properly. Do not connect or disconnect probes or test
leads while they are connected to a voltage source.
Ground the Product. This product is indirectly grounded through the grounding
conductor of the mainframe 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, ensure that the product is properly
grounded.
Observe All Terminal Ratings. To avoid fire or shock hazard, observe all ratings
and marking on the product. Consult the product manual for further ratings
information before making connections to the product.
Do not apply a potential to any terminal, including the common terminal, that
exceeds the maximum rating of that terminal.
Do Not Operate Without Covers. Do not operate this product with covers or panels
removed.
Use Proper Fuse. Use only the fuse type and rating specified for this product.
Avoid Exposed Circuitry. Do not touch exposed connections and components
when power is present.
Do Not Operate With Suspected Failures. If you suspect there is damage to this
product, have it inspected by qualified service personnel.
Do Not Operate in Wet/Damp Conditions.
Do Not Operate in an Explosive Atmosphere.
Keep Product Surfaces Clean and Dry.
Provide Proper Ventilation. Refer to the manual’s installation instructions for
details on installing the product so it has proper ventilation.
TLA Series Digitizing Oscilloscope Modules Service Manual
v
General Safety Summary
Symbols and Terms
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.
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.
Symbols on the Product. The following symbols may appear on the product:
WARNING
High Voltage
Protective Ground
(Earth) Terminal
CAUTION
Refer to Manual
Double
Insulated
vi
TLA Series Digitizing Oscilloscope Modules Service Manual
Service Safety Summary
Only qualified personnel should perform service procedures. Read this Service
Safety Summary and the General Safety Summary before performing any service
procedures.
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.
Disconnect Power. To avoid electric shock, disconnect the main power by means
of the power cord or, if provided, the power switch.
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.
To avoid electric shock, do not touch exposed connections.
TLA Series Digitizing Oscilloscope Modules Service Manual
vii
Service Safety Summary
viii
TLA Series Digitizing Oscilloscope Modules Service Manual
Preface
Manual Structure
This is the service manual for the Tektronix Logic Analyzer Series Digitizing
Oscilloscope Modules (TLA7D1, TLA7D2, TLA7E1, & TLA7E2). Read this
preface to learn how this manual is structured, what conventions it uses, and
where you can find other information related to servicing this product. Read the
Introduction, which follows this preface, for safety and other important
background information needed before using this manual for servicing this
product.
The TLA Series Digitizing Oscilloscope Manual is divided into chapters, which
are made up of related subordinate topics. These topics can be cross referenced
as sections.
Be sure to read the introductions to all procedures. These introductions provide
important information needed to do the service correctly, safely, and efficiently.
A brief description of each chapter follows:
H Specifications contains a product description of the DSO Module and tables
of the characteristics and descriptions that apply to it.
H Operating Information includes basic installation and operating instructions
at the level needed to safely operate and service the DSO Module. For
complete installation and configuration procedures, refer to the Tektronix
Logic Analyzer Family User Manual.
H Theory of Operation contains circuit descriptions that support general service
to the circuit board level.
H Performance Verification contains the performance verification procedures
for the DSO Module.
H Adjustment Procedures contains the adjustment procedures for the DSO
Module.
H Maintenance contains information and procedures for doing preventive and
corrective maintenance on the DSO Module. Included are instructions for
cleaning, for removal and installation of replaceable parts, and for troubleshooting.
H Options contains information on the factory-installed options that may be
available for the DSO Module.
TLA Series Digitizing Oscilloscope Modules Service Manual
ix
Preface
Manual Conventions
H Diagrams contains a block diagram and an interconnection diagram useful
for isolating failed circuit boards or assemblies.
H Mechanical Parts List includes a table of all replaceable parts, their
descriptions, and their Tektronix part numbers.
This manual uses certain conventions that you should become familiar with
before attempting service.
Modules
Replaceable Parts
Safety
Related Manuals
Throughout this manual, the term module refers to a TLA 700 Series Logic
Analyzer or DSO unit that mounts inside a TLA 700 Series Portable or Benchtop
Chassis. A module is composed of circuit cards, interconnecting cables, and a
user-accessible front panel.
This manual refers to any field-replaceable assembly or mechanical part
specifically by its name or generically as a replaceable part. In general, a (field)
replaceable part is any circuit board or assembly that is listed in the replaceable
parts list.
Symbols and terms related to safety appear in the Service Safety Summary found
at the beginning of this manual.
The following manuals are available as part of the Tektronix Logic Analyzer
Family documentation set. The procedures in this manual assume that the service
personnel have access to all manuals listed in the following table. Other manuals
may exist outside of the table as the product line offerings change. Contact your
local Tektronix Service Representative for the latest part numbers of the service
documentation. You can also obtain part numbers from the online help for the
instrument.
x
TLA Series Digitizing Oscilloscope Modules Service Manual
Table i: Tektronix Logic Analyzer Family Documentation
Manual name Description Service use
Preface
The Tektronix Logic Analyzer Family User
Manual
The TLA715 Portable Mainframe Service
Manual.
The TLA721 Benchtop Mainframe &
TLA7XM Expansion Mainframe Service
Manual.
The TLA7Dx/TLA7EX Digitizing Oscilloscope Module Service Manual.
The TLA7PG2 Pattern Generator Module
Service Manual.
The TLA600 Logic Analyzer Service
Manual.
Provides basic operation and installation
information for the Tektronix Logic Analyzer
Family.
Provides service information for the
TLA715 Portable Mainframe.
Provides service information for the
TLA721 Benchtop Mainframe and the
TLA7XM Expansion Mainframes.
Provides service information for the DSO
modules.
Provides service information for the pattern
generator modules.
Provides service information for the
TLA600 Series Logic Analyzers.
Installation and removal of LA, DSO, and
pattern generator modules as well as the
mainframes.
Reinstallation of the system and application
software.
Isolating and correcting failures in the
portable mainframe and expansion
mainframes.
Isolating and correcting failures in the
mainframes.
Isolating and correcting failures in the DSO
module.
Performing periodic or after-repair functional or performance verifications, calibrations,
and certifications for the DSO modules.
Performing periodic or after-repair adjustments for the DSO modules.
Isolating and correcting failures in the
pattern generator module.
Performing periodic or after-repair functional or performance verifications, calibrations,
and certifications for the pattern generator
modules.
Isolating and correcting failures in the
TLA600 Logic Analyzer.
TLA Series Digitizing Oscilloscope Modules Service Manual
Performing periodic or after-repair functional or performance verifications, calibrations,
and certifications for the TLA600 Logic
Analyzer.
Performing periodic or after-repair adjustments for the TLA600 Logic Analyzer.
xi
Preface
xii
TLA Series Digitizing Oscilloscope Modules Service Manual
Introduction
This manual contains information needed to properly service the DSO Module,
as well as general information critical to safe and effective servicing.
To prevent personal injury or damage to the digitizing oscilloscope module,
consider the following requirements before attempting service:
H The procedures in this manual should be performed only by a qualified
service person.
H Read the General Safety Summary and Service Safety Summary found at the
beginning of this manual.
When using this manual for servicing, be sure to follow all warnings, cautions,
and notes.
Adjustment and Certification Interval
Generally, you should perform the adjustments and certification (calibration)
once per year, or following repairs that affect adjustment or calibration.
Strategy for Servicing
This manual supports and contains information needed for periodic maintenance
of the DSO Module. (Examples of such information are procedures for fault
isolation of a failed circuit board or assembly and for removal and replacement
of same.)
This manual also supports and contains information for corrective maintenance
of this product:
H Supports isolation of faults to the failed circuit board or assembly level
shown in the replaceable parts list
H Supports removal and replacement of those boards or assemblies
H Supports removal and replacement of fuses, chassis, and other mechanical
parts listed in the replaceable parts list
This manual does not support component-level fault isolation and replacement.
TLA Series Digitizing Oscilloscope Modules Service Manual
xiii
Introduction
Service Offerings
Tektronix provides service to cover repair under warranty as well as other
services that are designed to meet your specific service needs.
Whether providing warranty repair service or any of the other services listed
below, Tektronix service technicians are well equipped to service the DSO
Module. Tektronix technicians train on Tektronix products; they have access to
the latest information on improvements to the DSO Module as well as the latest
new product upgrades. Services are provided at Tektr onix Services Centers and
on-site at your facility, depending on your location.
Warranty Repair Service
Calibration and Repair
Service
Tektronix warrants this product for one year from date of purchase. (The
warranty appears behind the title page in this manual.) Tektronix technicians
provide warranty service at most Tektronix service locations worldwide. The
Tektronix product catalog lists all service locations worldwide or you can visit us
on our Customer Services World Center web site at http://www.tek.com/Mea-
surement/Service. See our latest service offerings and contact us by email.
In addition to warranty repair, Tektronix Service offers calibration and other
services which provide cost-effective solutions to your service needs and qualitystandards compliance requirements. Our instruments are supported worldwide by
the leading-edge design, manufacturing, and service resources of Tektronix to
provide the best possible service.
The following services can be tailored to fit your requirements for calibration
and/or repair of the DSO Module.
Service Agreements. If service options are not added to the instrument purchase,
then service agreements are available on an annual basis to provide calibration
services or post-warranty repair coverage for the DSO Module. Service
agreements may be customized to meet special turn-around time and/or on-site
requirements.
xiv
Service on Demand. Tektronix also offers calibration and repair services on a
“per-incident” basis that is available with standard prices for many products.
Self Service. Tektronix supports repair to the replaceable-part level by providing
for circuit board exchange.
Use this service to reduce down-time for repair by exchanging circuit boards for
remanufactured ones. Tektronix ships updated and tested exchange boards. Each
board comes with a 90-day service warranty.
TLA Series Digitizing Oscilloscope Modules Service Manual
Contacting Tektronix
Introduction
For More Information. Contact your local Tektronix service center or sales
engineer for more information on any of the Calibration and Repair Services just
described.
Phone 1-800-833-9200*
Address Tektronix, Inc.
Department or name (if known)
14200 SW Karl Braun Drive
P.O. Box 500
Beaverton, OR 97077
USA
Web site www.tektronix.com
Sales support 1-800-833-9200, select option 1*
Service support 1-800-833-9200, select option 2*
Technical support Email: techsupport@tektronix.com
1-800-833-9200, select option 3*
1-503-627-2400
6:00 a.m. -- 5:00 p.m. Pacific time
* This phone number is toll free in North America. After office hours, please leave a
voice mail message.
Outside North America, contact a Tektronix sales office or distributor; see the
Tektronix web site for a list of offices.
TLA Series Digitizing Oscilloscope Modules Service Manual
xv
Introduction
xvi
TLA Series Digitizing Oscilloscope Modules Service Manual
Specifications
Product Description
This chapter provides a general description of the DSO module and a list of
specifications under Characteristics Tables.
The digitizing oscilloscope (DSO) modules are designed for use with either the
benchtop mainframe or portable mainframe. Key features are listed below:
H Four standard configurations with full-featured, 1 MΩ/50 Ω inputs:
TLA7D2 and TLA7E2 have four channels, TLA7D1 and TLA7E1 have two
channels.
H A maximum realtime digitizing rate up to 5 GSample/second with an analog
bandwidth up to 1 GHz. See Table 1--1 for details.
Table 1- 1: Comparison of product features
Product Input channels Maximum sample rate Analog bandwidth
TLA7E2 4 5 GSample/second 1GHz
TLA7D2 4 2.5 GSample/s econd 500 MHz
TLA7E1 2 5 GSample/second 1GHz
TLA7D1 2 2.5 GSample/s econd 500 MHz
H A maximum record length of 15,000 samples with 8-bit vertical resolution
H A full complement of internal triggering modes such as edge, pulse, logic,
and setup hold
TLA Series Digitizing Oscilloscope Modules Service Manual
1- 1
Specifications
Characteristics Tables
This section lists the specifications for the DSO module. All specifications are
guaranteed unless noted “typical.” Specifications that are marked with the n
symbol are checked in the Performance Verification chapter of this manual.
The performance limits in this specification are valid with these conditions:
H The DSO module must have successfully passed self calibration at an
H The DSO module must be in an environment with temperature, altitude,
Table 1- 2: Signal acquisition system
ambient temperature between +20
_ C and +30_ C and after a warm-up period
of 30 or more minutes at these conditions.
humidity, and vibration within the operating limits described in these
specifications. This includes the warm-up period of 30 or more minutes at
these conditions.
Characteristic Description
n Accuracy, DC Gain ±1.5% for full scale ranges from 20 mV to 100 V
±2.0% for full scale ranges <19.9 mV
n Accuracy, Internal Offset
n Analog Bandwidth, DC--50 Ω Coupled Full Scale Range Setting Bandwidth
1
Full Scale Range Setting Offset Accuracy
10 mV -- 1 V
1.01 V -- 10 V
10.1 V -- 100 V
10.1 V -- 100 V DC -- 500 MHz (TLA7E1 and TLA7E2)
100 mV -- 10 V DC -- 1 GHz (TLA7E1 and TLA7E2)
50 mV -- 99.5 mV DC -- 750 MHz (TLA7E1 and TLA7E2)
20 mV -- 49.8 mV DC -- 600 MHz (TLA7E1 and TLA7E2)
10 mV -- 19.9 mV DC -- 500 MHz (TLA7E1 and TLA7E2)
±[(0.2% × | offset |) + 1.5 mV + (6% × full
scale range)]
±[(0.25% × | offset |) + 15 mV + (6% × full
scale range)]
±[(0.25% × | offset |) + 150 mV + (6% × full
scale range)]
DC -- 500 MHz (TLA7D1 and TLA7D2)
DC -- 500 MHz (TLA7D1 and TLA7D2)
DC -- 500 MHz (TLA7D1 and TLA7D2)
DC -- 500 MHz (TLA7D1 and TLA7D2)
DC -- 500 MHz (TLA7D1 and TLA7D2)
2
1
Net offset is the nominal voltage level at the DSO module input that corresponds to the center of the A/D Converter
dynamic range. Offset accuracy is the accuracy of this voltage level.
2
The limits given are for the ambient temperature range of 0_ Cto+30_ C. Reduce the upper bandwidth frequencies by
5 MHz for each _C above +30_ C. The bandwidth must be set to FULL.
1- 2
TLA Series Digitizing Oscilloscope Modules Service Manual
Table 1- 2: Signal acquisition system (Cont.)
Typicalfull-bandwidthrisetimesareshowninthe
Characteristic Description
Bandwidth, Analog, Selections 20 MHz, 250 MHz, and FULL on each channel
Calculated Rise Time, typical
-
chart to the right
3
Full Scale Range Setting TLA7E1 and TLA7E2
10.1 V -- 100 V
900 ps
Specifications
TLA7D1 and
TLA7D2
900 ps
100 mV -- 10 V
50 mV -- 99.5 mV
20 mV -- 49.8 mV
10 mV -- 19.9 mV
450 ps
600 ps
750 ps
900 ps
900 ps
900 ps
900 ps
900 ps
Crosstalk (Channel Isolation) ≥300:1 at 100 MHz and ≥100:1 at the rated bandwidth for the channel’s sensitivity
(Full Scale Range) setting, for any two channels having equal sensitivity sett ings
n Delay Between Channels, Full Bandwidth ≤100 ps with equal full scale Range and Coupling settings
Digitized Bits, Number of 8bits
Effective Bits, Realtime Sampling, typical Input Frequency TLA7E1 and
TLA7E2 5 GS/s
TLA7D1 and TLA7D2 2.5 GS/s
(each Channel)
(each Channel)
10.2 MHz 6.2 bits 6.2 bits
98 MHz 6.1 bits 6.1 bits
245 MHz 6.0 bits 6.0 bits
490 MHz 5.7 bits 5.7 bits
990 MHz 5.2 bits N/A
Frequency Limit, Upper, 20 MHz Bandwidth
20 MHz
Limited, typical
Frequency Limit, Upper, 250 MHz Bandwidth
250 MHz
Limited, typical
Input Channels, Number of Product Channels
TLA7E2 Four
TLA7D2 Four
TLA7E1 Two
TLA7D1 Two
Input Coupling DC, AC, or GND
3
Rise time (rounded to the nearest 50 ps) is calculated from the bandwidth when Full Bandwidth is selected. It is defined
4
by the following formula:
Rise Time (ns) = 450 BW (MHz)
4
GND input coupling disconnects the input connector from the attenuator and connects a ground reference to the input of
the attenuator.
TLA Series Digitizing Oscilloscope Modules Service Manual
1- 3
Specifications
v
a
v
ala
valueattheendofaspecifiedtimeintervalafte
r
Table 1- 2: Signal acquisition system (Cont.)
Characteristic Description
Input Impedance, DC--1 MΩ Coupled 1MΩ ±0.5% in parallel with 10 pF ±3pF
Input Impedance Selections
Input Resistance, DC--50 Ω Coupled
1MΩ or 50 Ω
50 Ω ±1%
Input VSWR, DC--50 Ω Coupled ≤1.3:1 from DC -- 500 MHz, ≤1.5:1 from 500 MHz -- 1 GHz
Input Voltage, Maximum, DC--1 MΩ,AC--1MΩ,
or GND Coupled
Input Voltage, Maximum, DC--50 Ω or AC--50 Ω
300 V
but no greater than ±420 V peak, Installation category II, derated at
RMS
20 dB/decade above 1 MHz
5V
, with peaks ≤ ±25 V
RMS
Coupled
Lower Frequency Limit, AC Coupled, typical ≤10 Hz when AC--1 MΩ Coupled; ≤200 kHz when AC--50 Ω Coupled
n Random Noise Bandwidth Selection RMS Noise
Full ≤(350 V + 0.5% of the full scale Setti ng)
250 MHz ≤(165 V + 0.5% of the full scale Setting)
20 MHz ≤(75 V + 0.5% of the full scale Setting)
Range, Internal Offset Full Scale Range Setting Offset Range
Range, Sensitivity (Full Scale Range),
10 mV -- 1 V
1.01 V -- 10 V
10.1 V -- 100 V
10 mV to 100 V
6
±1V
±10 V
±100 V
All Channels
Step Response Settling Errors, typical
The maximum absolute difference between the
lueat the end ofaspecified time inter
the mid-level crossing of the step, and the value
7
Maximum Settling
Full Scale Range
Setting
fter
10 mV -- 1 V
± Step Response
≤2V
Error (%) at
20 ns 100 ns 20 ms
0.5% 0.2% 0.1%
one second after the mid-level crossing of the
step, expressed as a percentage of the step
amplitude. See IEEE std. 1057, Section 4.8.1,
Settling Time Parameters.
1.01 V -- 10 V
10.1 V -- 100 V
≤20 V
≤200 V
1.0% 0.5% 0.2%
1.0% 0.5% 0.2%
5
5
The AC Coupled Lower Frequency Limits are reduced by a factor of 10 when 10X passive probes are used.
6
The sensitivity ranges from 10 mV to 100 V full scale in a 1- 2- 5 sequence of coarse settings. Between coarse settings,
you can adjust the sensitivity with a resolution equal to 1% of the more sensitive coarse setting. For example, between
the 500 mV and 1 V ranges, the sensitivity can be set with 5 mV resolution.
7
The Full Bandwidth settling errors are typically less than the percentages from the table.
1- 4
TLA Series Digitizing Oscilloscope Modules Service Manual
Table 1- 3: Timebase system
Characteristic Description
Range, Extended Realtime Sampling Rate 5 S/s to 10 MS/s in a 1--2.5--5 sequence
Range, Realtime Sampling Rate Products Limits
Specifications
TLA7E1 and
TLA7E2
TLA7D1 and
TLA7D2
Record Length 512, 1024, 2048, 4096, 8192, and 15000
n Long Term Sample Rate Accuracy ±100 ppm over any interval ≥ 1ms
25 MS/s to 5 GS/s on all channels simultaneously in a
1--2.5--5 sequence
25 MS/s to 2.5 GS/s on all channels simultaneously in a
1--2.5--5 sequence
TLA Series Digitizing Oscilloscope Modules Service Manual
1- 5
Specifications
c
a
Table 1- 4: Trigger system
Characteristic Description
n Accuracy (Time) for Pulse Glitch or
PulseWidth Triggering
Time Range Accuracy
2 ns to 500 ns
±(20% of Setting + 0.5 ns)
520 ns to 1 s
n Accuracy (DC) for Edge Trigger Level, DC
Coupled
Range (Time) for Pulse Glitch and Pulse Width
Triggering
Range, Trigger Level Source Range
Range, Trigger Point Position Minimum: 0%
Resolution, Trigger Level 0.2% of full scale for any Channel source
Resolution, Trigger Position One Sample Interval at any Sample Rate
Sensitivities, Pulse-Type Runt Trigger, typical 10% of full scale, from DC to 500 MHz, for vertical settings >100 mV full scale and
Sensitivities, Pulse-Type Trigger Width and
Glitch, typical
n Sensitivity, Edge-Type Trigger, DC Coupled The minimum signal levels required for stable edge triggering of an acquisition when
±((2%× | Setting) | ) + 0.03 of Full Scale Range + Offset Accuracy) for signals
having rise and fall times ≥20 ns
2nsto1s
Any Channel ±100% of full scale range
Maximum: 100%
≤10 V full scale at the BNC input
10% of full scale for vertical settings >100 mV full scale and ≤10 V full scale at the
BNC input
the trigger source is DC-coupled.
Products Trigger Source Sensitivity
TLA7E1 and TLA7E2 Any Channel 3.5% of Full Scale Range
±(104.5 ns + 0.01% of Setting)
from DC to 50 MHz, increasing to 10% of Full
Scale Range at 1 GHz
TLA7D1 and TLA7D2 Any Channel 3.5% of Full Scale Range
from DC to 50 MHz, increasing to 10% of Full
Scale Range at 500 MHz
Sensitivity, Edge-Type Trigger, Not DC Coupled,
typi
l
1- 6
Trigger Coupling Typical Signal Level for Stable Triggering
AC
High Frequency Reject One and one-half times the DC-coupled
Low Frequency Reject One and one-half times the DC-coupled
Noise Reject Three times the DC-coupled limits
Same as the DC-coupled limits for
frequencies above 60 Hz; attenuates
signals below 60 Hz
limits from DC to 30 kHz; attenuates
signals above 30 kHz
limits for frequencies above 80 kHz;
attenuates signals below 80 kHz
TLA Series Digitizing Oscilloscope Modules Service Manual
Table 1- 4: Trigger system (Cont.)
y
pic
a
typical
Characteristic Description
Time, Minimum Pulse or Rearm, and Minimum
Transition Time, for Pulse-Type Triggering,
t
l
Trigger Position Error, Edge Triggering, typical Acquisition Mode Trigger Position Error
For vertical settings >100 mV and ≤10 V at the BNC input
Pulse Class Minimum Pulse Width Minimum Rearm Width
Glitch 1ns 2 ns + 5% of Glitch Width
Setting
Width 1ns 2 ns + 5% of Width Upper
Limit Setting
Sample ±(1 Sample Interval+ 1 ns)
Table 1- 5: Front-Panel Connectors
Characteristic Description
n Probe Compensator, Output Voltage
The Probe Compensator output voltage in
peak-to-peak Volts
0.5 V (base--top) ± 1% into a ≥ 50 Ω load
Specifications
8
Table 1- 6: Environmental
Characteristic Description
Altitude, Operating and Nonoperating Operating: to 15,000 feet (4570 m) provided maximum ambient temperature is
derated by 1_ C/1000 ft. above 1000 ft.
Nonoperating: to 40,000 feet (12,190 m)
Humidity, Operating and Nonoperating To 95% relative humidity at or below +30_ C; to 45% relative humidity up to +50_ C
Temperature, Operating and Nonoperating Operating: 0_ Cto+50_ C ambient air, when operated in a mainframe that provides
at least 14 CFM of air flow resulting in no more than 12_ C temperature rise of the
air passing through this instrument.
Nonoperating: --40_ Cto+71_ C
8
The trigger position errors are typically less than the values given here. These values are for triggering signals having a
slew rate at the trigger point of ≥5% of full scale/ns.
TLA Series Digitizing Oscilloscope Modules Service Manual
1- 7
Specifications
Measurement,Control,andLaboratoryUs
e
Table 1- 7: Certifications and compliances
Characteristic Description
Certifications CAN/CSA-C22.2 No.1010.1 -- Safety Requirements for Electrical Equipment for
.
UL3111-1 Standard for Electrical Measuring and Test Equipment.
EC Declaration of Conformity EC Council Directive 89/336/EEC:
Emissions shall be within the limits specified by the following requirements:
Enclosure:
EN55011 Class A limits for radiated emissions.
AC Mains:
EN 60555 -- 2 for power line harmonics.
EN 55011 Class A limits for conducted emissions.
FCC Compliance Complies with the requirements of FCC CFR 47, Part 15, Subpart B, Class A for
radiated and conducted emissions.
Pollution Degree Pollutions Degree 2 (as defined in IEC 1010--1) -- indoor use only
Table 1- 8: Mechanical
Characteristic Description
Construction Material Chassis parts constructed of aluminum alloy; front panel constructed of plastic
laminate; circuit boards constructed of glass laminate. Cabinet is aluminum.
Weight Products Weight
TLA7D1 and TLA7E1 2.44 kg (5.38 lbs)
TLA7D2 and TLA7E2 2.55 kg (5.63 lbs)
Weight, shipping Products Weight
TLA7D1 and TLA7E1 6.35 kg (14 lbs)
TLA7D2 and TLA7E2 7.71 kg (17 lbs)
Overall Dimensions Height: 262.05 mm (10.32 in)
Width: 60.66 mm (2.39 in)
Depth: 373.38 mm (14.70 in)
1- 8
TLA Series Digitizing Oscilloscope Modules Service Manual
Operating Information
This chapter describes how to operate the DSO module when performing
maintenance. The operating information is limited to the functions you need to
perform the procedures found in this manual. You can find more detailed
operating instructions in the Tektronix Logic Analyzer Family User Manual and
in the online help.
The following sections are included in this chapter:
H The Installation section describes how to install the DSO module in the
mainframe.
H The Software Installation and Removal section describe how to install and
remove the performance verification and adjustment software. You need this
software to complete the performance verification procedures and adjustment
procedures as described in the Performance Verification and Adjustment
Procedures chapters of this manual.
H Operating Information describes front-panel connectors and indicators, the
power-on procedure, self cal, self tests, and instrument commands used for
maintenance.
Installation
Setting the Logical
Address
Basic installation instructions are contained in the Tektronix Logic Analyzer
Family User Manual; refer to that manual for detailed information not covered in
this manual. This section describes how the following tasks:
H Set the logical address
H Install the DSO module in a mainframe
H Remove the DSO module from a mainframe
Every module installed within a mainframe must have a unique logical address;
no two modules can have the same address. Two rotary switches on the rear
panel of the DSO module select the logical address. Refer to Figure 2--1 for the
switch location.
The factory default recommended switch setting (FF) allows the controller to
assign a logical address to the digitizing oscilloscope module. This is called
Dynamic Auto Configuration. Y ou can also select static addresses between 01
and FE hexadecimal (1 to 254 decimal). Read the following descriptions before
setting the logical address.
TLA Series Digitizing Oscilloscope Modules Service Manual
2- 1
Operating Information
NOTE. Do not set the digitizing oscilloscope logical address to 00. Logical
address 00 is reserved for the controller.
Least-significant
digit
Most-significant
digit
Figure 2- 1: Logical address switches
Dynamic Auto Configuration. With Dynamic Auto Configuration selected
(hexadecimal FF or decimal 255), the system automatically sets the address to an
unused value. For example, if there are devices set to addresses 01 and 02
already in your system, the resource manager will automatically assign the DSO
module an address other than 01 or 02.
Static Logical Address. Static logical address selections set the address to a fixed
value. If you use static logical addressing, each device within your system must
have a unique address to avoid communication problems.
2- 2
TLA Series Digitizing Oscilloscope Modules Service Manual
Operating Information
Installing the DSO Module
The DSO module can be inserted into any two adjacent slots in the mainframe
except Slot 0. Be sure the logical address is set before installation (see Setting
the Logical Address on page 2--1).
Use the following procedure and Figure 2--2 to install the digitizing oscilloscope
into the mainframe:
1. If you have not already done so, power the mainframe off.
2. Insert the DSO module into the mainframe top and bottom module guides
and push it partially into the mainframe (Figure 2--2). Then slide the module
into the mainframe as far as it will go without forcing it.
3. Use the ejector handles to secure the module in the mainframe.
4. Use a screwdriver to install the top and bottom retainer screws. Alternate
between the screws, applying only a few turns at a time to fully seat the
module.
Top r et ai ner scr ew s
Ejector
handle
Simultaneously
move handles
apart to eject
module.
Bottom retainer
screws
Figure 2- 2: Module retainer screws and ejector mechanism
TLA Series Digitizing Oscilloscope Modules Service Manual
2- 3
Operating Information
Removing the DSO
module from the
Mainframe
Use the following procedure to remove the DSO module from a mainframe.
1. Power off the mainframe.
2. Using a screwdriver, loosen the top and bottom retainer screws (Figure 2--2).
3. Grasp the ejector handles on the DSO module. At the same time, move the
top handle upward and the bottom handle downward to eject the DSO
module.
4. Pull the DSO module out of the mainframe.
Software Installation and Removal
These procedures describe loading and unloading the performance verification
and adjustment software. Refer to the Tektronix Logic Analyzer Family User
Manual for information on installing or removing any other software. It is
recommended you have ≥10 MB of free space on the hard drive before installing
the software. The Performance Verification software is located on Disk 1 of the
Tektronix Logic Analyzer Family Application Software CD.
NOTE. This installation program uses parameters you supply to create a custom
start-up file in your hard disk directory.
Verify PV/Adjust Software
Version
Verify Directories
The batch file enables the software to configure your instrument properly before
it runs the program.
1. Power on the instrument.
2. Exit the Application.
If your logic analyzer already has PV/Adjust software loaded on it, you must
verify that the version is the same as the version printed on Disc 1 of the
Tektronix Logic Analyzer Family Application Software CD.
If the version of the PV/Adjust software loaded on your logic analyzer is an
earlier version, you must delete the earlier version before you can load the newer
version.
If your logic analyzer already has a directory named Tekcats or Temptek on the
hard drive, the software installation cannot be completed. Follow these instructions to verify the directory is not present:
1. Select Start → Search → For Files or Folders.
2- 4
TLA Series Digitizing Oscilloscope Modules Service Manual
Operating Information
2. In the “Search for files or folders:” box, type “Tekcats” or “TempTek” and
then click the Search Now button for search for either directory .
3. If either directory is found follow the instructions under Removing the
Software to remove the software and the directories.
Install the PV/Adjust
Software
Removing the Software
Follow these instructions to install the PV/Adjust software.
1. Close all open windows on the desktop.
2. Insert Disk 1 of the Tektronix Logic Analyzer Family Application Software
CD in the CD-ROM drive.
3. Click the My Computer Icon and double-click the CD-ROM drive.
4. Double-click the TLA Performance Verification folder.
5. Double-click on the Logic Analyzer PV folder and then double-click the
Disk1 folder.
6. Double-click the Setup.exe icon to begin the installation program.
7. Follow the on-screen instructions to install the software on the hard disk.
8. After the installation is complete, go back to the TLA Performance
Verification folder on the CD.
This completes the software installation procedure.
Use the following procedure to remove the performance verification and
adjustment software from the instrument. These steps are necessary when you
want to upgrade the PV software.
1. Open Windows Explorer and then locate and select the C:\Tekcats folder.
2. Go to the File menu and select Delete to delete the folder.
3. Repeat steps 1 and 2 to delete the Temptek folder if it exists.
4. Select Start → Settings → Taskbar & Start Menu.
5. Click the Advanced tab followed by the Advanced button.
6. Open the following directory path under Documents and Settings:
All Users → Start Menu → Programs
7. Locate and delete the TLA Performance Verification item.
TLA Series Digitizing Oscilloscope Modules Service Manual
2- 5
Operating Information
Operating Information
This section provides the information you will need to operate the DSO module
when performing the procedures in this manual.
Connectors and Indicators
Figure 2--3 shows the connectors and indicators on the front panel of a four-channel digitizing oscilloscope. The two-channel model looks and operates the same,
but without the CH 3 and CH 4 inputs. Descriptions of each connector and
indicator follow the illustration.
2- 6
Figure 2- 3: Digitizing oscilloscope front panel
TLA Series Digitizing Oscilloscope Modules Service Manual
Operating Information
CH 1, CH 2, CH 3, and CH 4 Channel Inputs. These BNC input connectors drive the
vertical channel amplifiers and their dedicated digitizers. The TLA7D2 and
TLA7E2 have four input channels as shown in Figure 2--3. The TLA7D1 and
TLA7E1 have the top two channels.
The channel inputs may be set for 1 MΩ or 50 Ω input impedance. Coupling
selections are DC, AC, and Ground. The Ground setting grounds the internal
amplifier, but presents a high impedance to the signal.
READY Indicator. The green LED lights continuously after the digitizing
oscilloscope completes power-on. During normal operation, READY blinks
when an error occurs that generates a message.
ACCESSED Indicator. The yellow LED blinks on and then off under the
following conditions:
H Each time communication with the digitizing oscilloscope occurs
H When the Slot 0 controller asserts the Module Identification (MODID) line
Menu Overview
ARM’D Indicator. The green LED lights when the digitizing oscilloscope is ready
to accept a trigger signal to complete an acquisition.
TRIG’D Indicator. The green LED lights when a trigger is received for the most
recent acquisition.
PROBE COMPENSATION. The BNC output provides a signal for adjusting probe
compensation. The square wave frequency is approximately 1 kHz. Amplitude is
500 mV
into a ≥50 Ω load.
p-p
The digitizing oscilloscope is controlled by interactive windows through the
Windows application. The TLA Series application consists of the following
windows:
H System window. This window provides an overview of the entire logic
analyzer. Use this window to navigate through the logic analyzer. Figure 2--4
shows an example of the system window.
TLA Series Digitizing Oscilloscope Modules Service Manual
2- 7
Operating Information
Figure 2- 4: Typical system window
The center of the System window displays icons which represent hardware
modules installed in the logic analyzer. The icons are links to the other
windows in the logic analyzer.
H Setup Window. A setup window exists for each module in the logic analyzer.
It contains all of the setup information for the digitizing oscilloscope
module. Menus and dialogs contain information to set up the window as
needed.
H Listing Data Window. The Listing Data Window displays acquired data as
tabular text. Each column of data represents one group of data or other
logical data information, such as time stamps. Each row of data represents a
different time that the data was acquired; newer samples of data display
below older samples.
H Waveform Data Window. The Waveform Data Window displays acquired
data as graphical waveforms. All defined channel groups display as busforms
for the logic analyzer and as individual channels for the digitizing oscilloscope.
Refer to the online help for more information on the individual menus, icons,
and fields within each window.
2- 8
TLA Series Digitizing Oscilloscope Modules Service Manual
Theory of Operation
This chapter describes the electrical operation of the DSO module. The
information supports fault isolation to the module or circuit board level. It
supplements the diagnostic information found in the Troubleshooting section that
begins on page 6--25.
The following Block Level Description describes circuit operation to the
functional block level. When reading this description, refer to Figure 9--1 and
Figure 9--2 for interconnection and block diagram illustrations, respectively.
Block Level Description
The block level description provides an overview of each functional circuit
within the DSO module. Except for the number of channels, the basic operation
is the same for each model. The TLA7D2 and TLA7E2 models have four input
channels. The TLA7D1 and TLA7E1 have two input channels.
Input/Output Connectors
Acquisition Board (A2)
Input signals to be measured enter the DSO module through probes or cables
connected to BNC connectors on the front panel. A probe interface detects the
attenuation factor of each probe. The probe data is routed to the Acquisition
Board (A2) where it is used to set the vertical scale.
The front-panel BNC provides a probe compensation signal. A coaxial cable
assembly routes the signals between the front panel and the circuit boards.
The Acquisition Board (A2) accepts analog input signals and converts them to
digital information. Two 100-pin ribbon cables provide interconnections with the
Processor Board (A1) for power supplies, waveform data, and control signals.
The Acquisition Board (A2) consists of the following circuits:
H Attenuators
H Acquisition System
H VCO
H Trigger
H Intermodule Triggers
TLA Series Digitizing Oscilloscope Modules Service Manual
3- 1
Theory of Operation
Attenuators. Signals applied to each channel input (CH 1, CH 2, CH 3, and
CH 4) connect to an attenuator. The Main Processor System controls the
attenuators. The attenuators select input coupling, termination, bandwidth, offset,
and full scale range. Outputs from each attenuator drive the Acquisition System
and Trigger circuits.
Acquisition System. The Acquisition System amplifies the input signals, samples
them, and converts them to digital signals with 8-bit resolution. The system
controls the acquisition process under direction of the Main Processor System.
Voltage Controlled Oscillator (VCO). Master clocks for the Acquisition System are
generated by the Voltage Controlled Oscillator (VCO). The VCO circuit is a
phase locked loop that is referenced to a 10 MHz clock provided by the
mainframe.
Trigger. The Trigger circuit produces trigger signals to control the Acquisition
System timebase. Trigger signals are selected from the following sources:
Processor Board (A1)
H Attenuator — internal triggering
H Intermodule Triggers — triggering from the communications bus
Intermodule Triggers. The Intermodule Triggers circuit routes system-generated
TTLTRG and ECLTRG trigger signals to the Trigger circuit. Under control of
the Main Processor System, the Intermodule Triggers circuit selects which
TTLTRG and ECLTRG trigger signals are active, and defines the arming and
triggering parameters.
The Processor Board (A1) controls instrument hardware, signal acquisition, and
communications functions. Two 100-pin ribbon cables provide interconnections
with the Acquisition Board (A2) for power supplies, waveform data, and control
signals.
The Processor Board (A1) consists of the following circuits:
H Main Processor System
H DSP Processor System
H Backplane Interface
H Power Supplies
3- 2
TLA Series Digitizing Oscilloscope Modules Service Manual
Theory of Operation
Main Processor System. The Main Processor System contains a 68330 microprocessor that controls the entire instrument. Commands and data sent to the
instrument over the communications bus pass through the backplane interface,
which resides on the 68330 bus. The 68330 bus also routes data between the
Main Processor System and the DSP Processor System.
The Main Processor System includes the instrument firmware. To facilitate
upgrades the firmware resides in FlashROM that can be reprogrammed using a
Slot 0 controller.
DSP Processor System. The DSP Processor System contains a 320C31
microprocessor that controls signal acquisition, waveform processing, and
measurements. Acquisition Memory addressing signals are transferred over the
DSP Bus. The DSP Processor System is under control of the Main Processor
System.
Backplane Interface. The backplane interface transfers commands and data
between the communications bus and the Main Processor System. Signals pass
between the instrument and the communications bus through the P1 communications bus connector.
Power Supplies. The Power Supplies receive +5 V, --5 V , and 12 V from the
communications bus mainframe to power the DSO module. Fuses protect the
mainframe from over-current conditions. Voltage regulators produce additional
15 V and 5 V supplies for use on the Acquisition Board (A2). All power
connections to the Acquisition Board (A2) are made through the 100-pin ribbon
cables.
TLA Series Digitizing Oscilloscope Modules Service Manual
3- 3
Theory of Operation
3- 4
TLA Series Digitizing Oscilloscope Modules Service Manual
Performance Verification
This chapter contains procedures for functional verification, certification, and
performance verification procedures for the DSO modules. Generally, you should
perform these procedures once per year or following repairs that affect certification.
Summary Verification
Functional verification procedures verify the basic functionality of the instrument inputs, outputs, and basic instrument actions. These procedures include
power-on diagnostics, extended diagnostics, and manual check procedures.
These procedures can be used for incoming inspection purposes.
Certification procedures certify the accuracy of an instrument and provide a
traceability path to national standards. Calibration data reports are produced for
the DSO modules as output from the performance verification and adjustment
software.
Performance verification procedures confirm that a product meets or exceeds the
performance requirements for the published specifications documented in the
Specifications chapter of this manual. Refer to Figure 4--1 on page 4--2 for a
graphic overview of the procedures.
Adjustment procedures check for, and if necessary, correct any adjustment errors
discovered when performing functional or performance verification procedures.
The adjustment procedures are controlled by software. Some of the adjustment
procedures require user intervention to move probes or change test equipment
settings.
The performance verification and adjustment software is provided on the product
CD-ROM. If you have not already done so, refer to Software Installation and
Removal beginning on page 2--4 for instructions on installing the performance
verification and adjustment software.
TLA Series Digitizing Oscilloscope Modules Service Manual
4- 1
Performance Verification
Determine equipment
to certify.
Use
Tektronix-supplied
probes.
Go to appropriate
procedure(s).
Gather required test
equipment.
Is it OK
No
with customer to
remove/reconnect probes
from System
Under Test?
Select procedure.
Configure customer’s
mainframe and modules as
described in procedure.
Set up test equipment.
Yes
Allow all mainframes, modules and
equipment to warm up (30 minutes).
Load PV/Adjust
software.
Perform procedure
using software.
Do tests
pass?
No
Yes
Print Calibration
Data Report.
Create necessary
Calibration Certificate.
No
Are
all certifications
complete?
Repair or adjust
equipment as
required.
Figure 4- 1: Calibration/certification procedure flow chart
4- 2
TLA Series Digitizing Oscilloscope Modules Service Manual
Yes
Done
Test Equipment
These procedures use external, traceable signal sources to directly test characteristics that are designated as checked (n)intheSpecifications chapter of this
manual. Table 4--1 shows the required equipment list. Always warm up the
equipment for 30 minutes before beginning the procedures.
Table 4- 1: Test Equipment
Item number and description Minimum requirements Example
Performance Verification
1. Mainframe TLA700 Series Mainframe with a DSO
module installed
2. DSO probe calibration fixture One required Tektronix part number 671-3930-XX
3. DSO probes Two required, with < one-inch ground leads Tektronix P6243 or P6245 probe, with std.
4. Adapter, male BNC-to-male BNC One required Tektronix part number 103-0029-XX
5. Digital multimeter with test leads DCV accuracy: 0.1% from --10 V to +100 V Tektronix DMM 900 Series
6. Connector, dual-banana Female BNC-to-dual banana Tektronix part number 103-0090-XX
7. Voltage reference Accuracy: ≤0.01% Data Precision 8200
8. Capacitor
9. Cable, dual-input Female BNC-to-dual male BNC Tektronix part number 067-0525-XX
10. Adapter, N-to-BNC Male type N-to-female BNC Tektronix part number 103-0045-XX
11. Adapter, SMA-to-BNC Female type SMA-to-female BNC Tektronix part number 015-1018-XX
12. Cable, precision 50 Ω coaxial 50 Ω, 36 in, male-to-male BNC connectors Tektronix part number 012-0482-XX
13. Generator, function Frequency range: 1 Hz to 20 MHz
14. Generator, sine wave Frequency range: 100 kHz to 1005 MHz
15. Power meter with sensor Bandwidth: >1.2 GHz Accuracy:
16. Adapter, N-to-BNC (used only with
17. 50 Ω power divider (used only with
18. SMA-to-BNC adapters (used only with
19. Printer with cable (optional, to print
1
1
power meter)
power meter)
power meter)
Calibration Data Reports)
The capacitor is installed across the Data Precision 8200 output terminals to reduce noise. If your voltage reference
produces <4 mVp-p of noise, external noise reduction is not necessary.
0.1 F, 200 V Tektronix part number 283-0189-XX
Frequency accuracy: 0.1%
Amplitude range: 10 mV to 20 V
Frequency accuracy: <6 ppm
Amplitude: 2 mV to 1.5 V
<0.35 dB
0.2 dB Sensitivity: 500 pW to 20 mW
Female type N-to-male BNC Tektronix part number 103-0058-XX
Provide load isolation between equipment
Maximum VSWR: 1.50
For use with the 50 Ω power divider
(three required)
PC-compatible, continuous feed, prints
ASCII text, connects to EPP connector
RMS
p-p
Accuracy:
TLA721 Benchtop mainframe or
TLA715 Portable Mainframe
accessories
Hewlett Packard 3325B
Gigatronics 6061
Rohde & Schwarz NRVS with model
NRV-Z4 Sensor
Tektronix part number 015-0565-XX
Tektronix part number 015-1018-XX
Any general purpose printer
TLA Series Digitizing Oscilloscope Modules Service Manual
4- 3
Performance Verification
Functional Verification
The functional verification procedure consists of the following parts:
H Self tests and power-on diagnostics
H Extended diagnostics
H Self calibration (Self cal)
H Probe calibration
This procedure provides a functional check only. Perform the functional
verification procedure whenever you need to gain confidence that the DSO
module is operating properly. If more detailed testing is required, perform the
performance verification procedure, which begin on page 4--7, after completing
the functional check procedures.
Test Equipment
Setup
Self Tests and Power-On
Diagnostics
You will need the following test equipment identified by the item numbers listed
inTable4--1onpage4--3.
H TLA700 Series Logic Analyzer mainframe with one DSO module
H One P6243 or P6245 oscilloscope probe, with standard accessories (item 3)
H One DSO probe calibration fixture (item 2)
H One male-male BNC adapter (item 4)
It is assumed that the DSO module is properly installed and that all accessories
are connected. Refer to the Tektronix Logic Analyzer Family User Manual for
detailed installation instructions.
Power on the instrument and allow a 30-minute warmup before continuing with
any procedures in this section.
During power-on, the installed modules perform an internal self test to verify
basic functionality. No external test equipment is required. The self tests require
only a few seconds per module to complete. The front-panel ARM’Dand
TRIG’D indicators blink during the self test. After testing completes, the front
panel indicators have the following states:
4- 4
H READY — Green (on)
H ACCESSED — off
H ARM’D — off
H TRIG’D — off
TLA Series Digitizing Oscilloscope Modules Service Manual
Performance Verification
Next, the power-on diagnostics are run. If any self tests or power-on diagnostics
fail, the instrument will display the Calibration and Diagnostics property sheet.
Extended Diagnostics
Complete the following steps to run the Extended Diagnostics on the DSO
module:
1. Go to the System menu and select Calibration and Diagnostics.
2. Click on the Extended Diagnostics tab.
Figure 4- 2: Calibration and Diagnostics property sheet
3. Select the top-level test for the module; refer to Figure 4--2.
4. Under the Run button, select One Time.
5. Click the Run button, then click OK to run the extended diagnostics.
When the instrument runs the extended diagnostics all tests with an
Unknown test status will change to either a pass or fail result.
6. When the extended diagnostics are complete, check that all tests for the
module have passed.
Self Cal
TLA Series Digitizing Oscilloscope Modules Service Manual
Self calibration is an internal routine that optimizes performance at the current
ambient temperature to maximize measurement accuracy . No external equipment
or user actions are needed to complete the procedure. The DSO module saves
data generated by the self calibration in nonvolatile memory.
4- 5
Performance Verification
NOTE. Performing the self calibration does not guarantee that all parameters
operate within limits. Operation within limits is checked by performing the
performance verification procedures.
When to Perform Self Calibration. You can run the self calibration at any time
during normal operation. To maintain measurement accuracy, perform the
self calibration if any of the following conditions occur:
H Operating temperature is not within ᐔ5° C of the temperature when the
self calibration was last performed.
H Once a week when the vertical input voltage range of 50 mV/div or less is
used.
Running the Self Calibration. Complete the following steps to run the self
calibration:
Probe Calibration
1. Ensure that the instrument has had a 30-minute warmup before attempting
the self calibration.
2. Disconnect any probes connected to the DSO module.
3. Go to the System menu and select Calibration and Diagnostics.
4. Select the Self Calibration tab page.
5. Select the DSO module.
6. Click the Run button to start the self calibration.
The self calibration takes several minutes to complete. Upon successfully
completing the self calibration, the module status changes from Running to
Calibrated and the Date and Time field is set to the present.
You should perform a probe calibration on any active probes that you intend to
use with the DSO module. To perform the probe calibration, complete the
following steps:
1. Connect an oscilloscope probe to the probe input channel on the DSO
module.
2. Connect the DSO probe calibration fixture to the DSO module probe
compensation output.
4- 6
3. Click the Setup button in the DSO module icon.
4. Select the tab page for the input channel.
TLA Series Digitizing Oscilloscope Modules Service Manual
5. Click the Probe Cal button.
6. Follow the on-screen instructions for completing the probe calibration.
For more information on the probe calibration, refer to the online help.
DSO Module Certification
The certification procedures for the DSO module consist of performing the
Performance Verification Tests and printing the software-generated Calibration
Data Report.
Performance Verification Instructions
This section contains information to verify the performance of the DSO module.
Testing is performed using the performance verification and adjustment software.
Performance Verification
Prerequisites
The performance verification and adjustment software contains instructions and
control programs for testing each characteristic that is designated as checked (n)
in the Specifications chapter of this manual.
As a general rule, these tests should be done once a year.
These procedures ask for the serial number of the DSO module under test.
Before installing the DSO module in the benchtop chassis or portable mainframe, record the serial number of the DSO module.
Alternatively, you can access the module serial number through the logic
analyzer application. Go to the System menu, select System Properties, and then
click the DSO module tab.
You must quit the logic analyzer application before continuing with the
performance verification and adjustment software procedures.
The tests in this section comprise an extensive, valid confirmation of performance and functionality when the following requirements are met:
H When multiple DSO modules of the same model number are installed in the
mainframe, the performance verification and adjustment software will
address only the module in the highest slot number.
If you are testing a TLA7E1 module, for example, move it to a higher slot
number than all other TLA7E1 modules in the mainframe. This method
avoids unnecessary module warm-up time.
TLA Series Digitizing Oscilloscope Modules Service Manual
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Performance Verification
H The logic analyzer application must not be running, and the performance
verification and adjustment software must be loaded. Refer to Software
Installation and Removal on page 2--4.
H The DSO module must be installed in a TLA700 Logic Analyzer, must have
been operating for a warm-up period of at least 30 minutes, and must be
operating at an ambient temperature between +20_ C and +30_ C.
H The DSO module must have been last adjusted at an ambient temperature
between +20_ C and +30_ C.
H The logic analyzer must be in an environment within the limits described in
the Specifications section of the Tektronix Logic Analyzer Family User
Manual.
Procedure Overview
When using the performance verification and adjustment software, you will
connect external test equipment to the DSO module in response to prompts on
the screen. You will connect the test signals and then instruct the program to
continue.
The performance verification and adjustment software automatically selects the
DSO module settings and determines the results of each test. The results of the
tests are recorded in a temporary file and are available for printing for certification.
To obtain partial test information you can also run individual tests or selected
groups.
NOTE. The INTERNAL_CAL (self calibration) test must run successfully before
the other tests are performed. The remaining tests can be performed in any order.
The performance verification and adjustment software contains the tests shown
in Table 4--2. Each test verifies one or more parameters. All of the tests except
INTERNAL_CAL check characteristics that are designated as checked (n)inthe
Specifications section of the Tektronix Logic Analyzer Family User Manual.By
running a full sequence, you will verify the performance of the DSO module.
4- 8
Table 4- 2: DSO PV/Adjust software performance verification tests
Test name Specification tested
1. INTERNAL_CAL Runs the internal self cal
2. DC_GAIN_ACCURACY
3. OFFSET_ACCURACY
4. ANALOG_BANDWIDTH
5. RANDOM_NOISE
1
1
1
1
Accuracy, DC gain
Accuracy, offset
Analog bandwidth, DC coupled --50 Ω
Random noise
TLA Series Digitizing Oscilloscope Modules Service Manual
Performance Verification
Table 4- 2: DSO PV/Adjust software performance verification tests (Cont.)
Test name Specification tested
6. DELAY_BETWEEN_CHAN
7. TIMEBASE_ACCURACY
8. GLITCH_TRIG_ACC
9. TRIG_MAIN_ACC
10. TRIG_MAIN_SENS
11. PROBE_COMPENSATION
1
Certifiable parameter
1
1
Delay between channels, full bandwidth
1
Accuracy, long term sample rate and delay time
1
1
Accuracy (time) for pulse glitch or pulse width triggering
Accuracy (DC) for internal and external trigger level, DC
coupled
Sensitivity, edge-type trigger, DC coupled
1
Probe compensation, output voltage
The procedures in this document assume that you will run a full sequence of
tests. Each test includes a simple illustration of the test equipment setups and a
table summarizing the parameters being verified.
Using the Software
You must perform a full performance verification sequence on the DSO module
when replacing any circuit board in the module. If the performance verification
tests fail, perform the adjustment procedure as described in the Adjustment
Procedures, then rerun the performance verification tests.
The DSO software consists of executable software files. Use the following steps
to start and run the software:
1. Allow the instruments to warm up for at least 30 minutes before beginning
the procedure.
2. Quit all applications including the TLA application.
3. Select Start → Programs → TLA Performance Verification.
4. To run the performance verification and adjustment software, select the
following:
H For the TLA7Dx and TLA7Ex DSO modules, select DSO PV.
5. Follow the instructions on the screen to enter the name you want to appear in
the User Name field as shown below. This name will appear on the
Calibration Data Reports.
6. The program lists several different modules, referred to as DUT (Device
Under Test). Enter the number corresponding to the module type that you
want to test; then click Enter to continue.
TLA Series Digitizing Oscilloscope Modules Service Manual
4- 9
Performance Verification
The screen will display an error message if the DUT chosen does not match
the installed DUT.
7. Click Enter to continue.
8. Enter the complete serial number of the DUT (for example, B010100). Click
Enter to continue.
If you select no, a prompt asks you to enter the serial number again.
9. The program lists sequences for PV (performance verification) and ADJ
(adjustments). Enter a number to select which sequence you want and click
Enter to continue.
10. If an instrument is being tested, the program lists the different probe types
available for testing. Enter the appropriate number corresponding to your
probe and then click Enter to continue.
11. Enter the operating temperature in degrees C (entries in the range of 20 to 30
degrees are valid). Click Enter to continue.
12. Enter the operating humidity as a percentage (0% to 100% entries are valid).
Click Enter to continue.
13. Determine which sequence to run:
H RUN FULL SEQUENCE runs the entire sequence from beginning to
end. This is the recommended selection.
H RUN PARTIAL SEQUENCE runs part of the full sequence. The
sequence runs from the selected starting point to the end of the sequence.
4- 10
TLA Series Digitizing Oscilloscope Modules Service Manual
Performance Verification
H SELECT TEST(S) runs only the selected tests. To run a single test, enter
the test number. To run multiple tests, enter a comma-separated list of
numbers or a hyphen-separated list of numbers.
Enter the number next to your choice and click Enter to continue.
14. Follow the on-screen instructions to connect and adjust test equipment.
15. When testing is completed, disconnect the test equipment.
Using the Interrupt Button
Obtaining Test Results
While the program is running, you can interrupt the program to rerun a test, start
over, or to exit the program by clicking the Interrupt button (shown below).
The program will then provide a list of choices. Enter the number next to the
choice that you want and click Enter.
NOTE. If you interrupt a test before it has completed, you must restart the test to
obtain valid test data.
Some tests such as Internal Cal do not allow interrupts. If you stop these tests
using more aggressive methods, you may have to reboot the instrument.
The results of all tests can be stored in a file on the hard disk. You can view the
test results, print the test results to a printer, or save the test results in another file
on the hard disk. The software stores the test results in a file containing the
module name and serial number (for example, TLA7E2.B020123). The file is
located under the following path: C:\Tekcats\Rpt.
NOTE. If you want to save the content of the Report file, you must rename or
copy the Report file using the Windows file utilities such as Explorer.
The Report file will be overwritten the next time you run the performance
verification and adjustment software and print or view a new set of test data.
After completing a full or partial test sequence (or just before you exit the
program) you can generate the test data and write it to a file. You have the option
of printing the file, viewing the file on screen, or transferring the file to another
directory or host computer.
TLA Series Digitizing Oscilloscope Modules Service Manual
4- 11
Performance Verification
You can print the test data directly from the program. Ensure that a printer is
connected to your logic analyzer and follow the on-screen instructions to print
the test results.
If a printer is not available, you can view the test results directly from the screen,
or you can copy the test results to a different file or folder/host computer for
future use.
Field Adjust/PV Software
Housekeeping
Troubleshooting
The performance verification and adjustment software creates data log files (.dlf
files) that store program data. The .dlf files are used by the performance
verification and adjustment software to generate the view data and print out
options. Each .dlf file is identified by the product serial number; for example,
B010100.dlf. The files are stored in the Tekcats folder under each TLA7xx
folder. To conserve disk space, you must occasionally delete the .dlf files.
If any tests fail, use the following steps to troubleshoot the problems:
1. Check all test equipment for improper or loose connections.
2. Check that all test equipment is powered on and has the proper warm-up
time.
3. Run the tests a second time to verify the failure.
4. If tests continue to fail, refer to Table 4--3 to determine the source of the
failure.
Table 4- 3: DSO module fault isolation
Test name Possible circuit board failure
1. INTERNAL_CAL A2 Acquisition board
4- 12
2. DC_GAIN_ACCURACY A2 Acquisition board
3. OFFSET_ACCURACY A2 Acquisition board
4. ANALOG_BANDWIDTH A2 Acquisition board
5. RANDOM_NOISE A2 Acquisition board
6. DELAY_BETWEEN_CHAN A2 Acquisition board
7. TIMEBASE_ACCURACY A2 Acquisition board / Mainframe
8. GLITCH_TRIG_ACC A2 Acquisition board
9. TRIG_MAIN_ACC A2 Acquisition board
10. TRIG_MAIN_SENS A2 Acquisition board
11. PROBE_COMPENSATION A1 Processor board
TLA Series Digitizing Oscilloscope Modules Service Manual
Performance Verification Tests
This section describes the individual tests and the test equipment connections.
All tests contain a brief table listing the following information:
H Software test name
H A brief list of test equipment
H A list of prerequisites for each test
Most of the tests include a simple test equipment connection diagram (unless
there are no changes from the previous test).
Performance Verification
DSO Procedure 1:
Internal Calibration
This procedure checks the internal self calibration of the DSO module. The
INTERNAL_CAL test is the performance verification and adjustment software
equivalent of SELF
SW test name
Equipment
required
Prerequisites Warm-up time: 30 minutes
_CAL.
INTERNAL_CAL
None required
All probes disconnected
Power-up diagnostics pass
No previous tests required
1. If the logic analyzer application is running, quit the application.
2. Verify that all of the prerequisites listed previously are met for the procedure.
3. Run the performance verification and adjustment software.
4. Select TLA_dig, then select the correct module type and the PV test option.
5. Follow the on-screen instructions to run the test for the DSO module.
6. Verify that this test passes before continuing with any other tests.
TLA Series Digitizing Oscilloscope Modules Service Manual
4- 13
Performance Verification
DSO Procedure 2:
DC Gain Accuracy
This procedure checks the DC gain accuracy of the DSO module.
SW test name DC_GAIN_ACCURACY
Equipment
required
Prerequisites Warm-up time: 30 minutes
1
Install the 0.1 F capacitor across the voltage reference output terminals
to reduce noise.
DSO module
Voltage reference (item 7)
Precision BNC cable (item 12)
Dual banana-to-BNC adapter (item 6)
Capacitor, 0.1 F
1
(item 8)
The logic analyzer application is not running
The performance verification and adjustment software is loaded
Test equipment connected as shown in Figure 4--3
Power-up diagnostics pass
INTERNAL_CAL test passes
CH 1
Precision BNC
cable
4- 14
Voltage reference
0.1 F Capacitor
+
--
Dual banana-to-BNC
adapter
Figure 4- 3: Initial setup for the DC gain accuracy test
1. Verify that all of the prerequisites listed previously are met for the procedure.
2. Follow the on-screen instructions to run the test for each channel on the DSO
module.
3. After the test begins, make changes to test equipment settings and connections when requested by the on-screen instructions.
4. Verify that all of the tests pass. If a test fails, check the Troubleshooting
sectiononpage4--12.
TLA Series Digitizing Oscilloscope Modules Service Manual
Performance Verification
DSO Procedure 3:
Offset Accuracy
This procedure checks the offset accuracy of the DSO module.
SW test name OFFSET_ACCURACY
Equipment
required
Prerequisites Warm-up time: 30 minutes
No change from the DC Gain Accuracy test
The logic analyzer application is not running
The performance verification and adjustment software is loaded
Test equipment connected as shown in Figure 4--3
Power-up diagnostics pass
INTERNAL_CAL test passes
1. Verify that all of the prerequisites listed previously are met for the procedure.
WARNING. These procedures use voltage levels that step through ±99.90 volts.
Use caution when using voltages approaching this magnitude.
2. Follow the on-screen instructions to run the test for each channel on the
DSO module.
3. After the test begins, make changes to test equipment settings and connections when requested by the on-screen instructions.
4. Verify that all of the tests pass. If a test fails, check the Troubleshooting
sectiononpage4--12.
TLA Series Digitizing Oscilloscope Modules Service Manual
4- 15
Performance Verification
DSO Procedure 4:
Analog Bandwidth
This procedure checks the analog bandwidth, DC coupled specification of the
DSO module.
SW test name ANALOG_BANDWIDTH
Equipment
required
Prerequisites Warm-up time: 30 minutes
1
The output frequency of the sine wave generator must maintain a constant output
amplitude within 0.35 dB of the reference frequency (10 MHz) through the bandwidth
calibration frequency range (1005 MHz).
2
If you require a power meter to maintain a constant output amplitude use the
equipment setup as shown in Figure 4- 5.
Sine wave generator1(item 14)
Precision BNC cable (item 12)
Type N-to-BNC adapter (item 10)
The logic analyzer application is not running
The performance verification and adjustment software is loaded
Test equipment connected as shown in Figure 4--4
2
Power-up diagnostics pass
INTERNAL_CAL test passes
DSO module
Sine wave generator
CH 1
Precision
BNC cable
Type N-to-BNC
adapter
Figure 4- 4: Initial setup for the analog bandwidth test
4- 16
TLA Series Digitizing Oscilloscope Modules Service Manual
Performance Verification
Power meter and Power sensor (item 15)
DSO module
CH 1
SMA-to-BNC
adapter
(item 18)
BNC-to-BNC
adapter (item 4)
Type N-to-BNC adapter (item 16)
SMA-to-BNC adapter (item 18)
Power divider (item 17)
SMA-to-BNC adapter (item 18)
Sine wave generator (item 14)
Type N-to-BNC
adapter (item 16)
Precision BNC
cable (item 12)
Figure 4- 5: Using a power meter to monitor the amplitude of the sine wave
generator during the analog bandwidth test
1. Verify that all of the prerequisites listed previously are met for the procedure.
2. Follow the on-screen instructions to run the test for each channel on the
DSO module.
3. Verify that all of the tests pass. If a test fails, check the Troubleshooting
sectiononpage4--12.
TLA Series Digitizing Oscilloscope Modules Service Manual
4- 17
Performance Verification
DSO Procedure 5:
Random Noise
This procedure checks the random noise specification of the DSO module.
SW test name RANDOM_NOISE
Equipment
required
Prerequisites Warm-up time: 30 minutes
No external test equipment required
The logic analyzer application is not running
The performance verification and adjustment software is loaded
Power-up diagnostics pass
INTERNAL_CAL test passes
1. Verify that all of the prerequisites listed previously are met for the procedure.
2. Follow the on-screen instructions to run the test for the DSO module.
3. Verify that all of the tests pass. If a test fails, check the Troubleshooting
sectiononpage4--12.
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TLA Series Digitizing Oscilloscope Modules Service Manual
Performance Verification
DSO Procedure 6:
Delay Between Channels
This procedure checks the delay between channels for the full bandwidth of the
DSO module.
SW test name DELAY_BETWEEN_CHAN
Equipment
required
Prerequisites Warm-up time: 30 minutes
1
Use the dual input cable or a set of matched cables when running this test. If you
use unmatched coaxial cables, the test may fail or may be miscalibrated due to an
electrical mismatch between the cables.
Sine wave generator (item 14)
Precision BNC cable (item 12)
Dual input BNC cable
1
(item 9)
Type N-to-BNC adapter (item 10)
The logic analyzer application is not running
The performance verification and adjustment software is loaded
Test equipment connected as shown in Figure 4--6
Power-up diagnostics pass
INTERNAL_CAL test passes
DSO module
Dual input
cable
Sine wave generator
CH 1
Precision BNC
cable
Type N-to-BNC adapter
Figure 4- 6: Initial setup for the delay between channels test
1. Verify that all of the prerequisites listed previously are met for the procedure.
2. Follow the on-screen instructions to run the test for the DSO module.
3. Verify that all of the tests pass. If a test fails, check the Troubleshooting
sectiononpage4--12.
TLA Series Digitizing Oscilloscope Modules Service Manual
4- 19
Performance Verification
DSO Procedure 7:
Timebase Accuracy
This procedure checks the long-term sample rate and delay time accuracy of the
DSO module.
SW test name TIMEBASE_ACCURACY
Equipment
required
Prerequisites Warm-up time: 30 minutes
DSO module
Sine wave generator (item 14)
Precision BNC cable (item 12)
Type N-to-BNC adapter (item 10)
The logic analyzer application is not running
The performance verification and adjustment software is loaded
Test equipment connected as shown in Figure 4--7
Power-up diagnostics pass
INTERNAL_CAL test passes
CH 1
Precision BNC
cable
Sine wave generator
Type N-to-BNC
adapter
Figure 4- 7: Initial setup for the timebase accuracy test
1. Verify that all of the prerequisites listed previously are met for the procedure.
2. Follow the on-screen instructions to run the test for the DSO module.
3. Verify that all of the tests pass. If a test fails, check the Troubleshooting
sectiononpage4--12.
4- 20
TLA Series Digitizing Oscilloscope Modules Service Manual
Performance Verification
DSO Procedure 8:
Glitch Trigger Accuracy
This procedure checks the time accuracy for the pulse glitch or for the pulse
width triggering of the DSO module.
SW test name GLITCH_TRIG_ACC
Equipment
required
Prerequisites Warm-up time: 30 minutes
No change from the previous test (Timebase Accuracy)
The logic analyzer application is not running
The performance verification and adjustment software is loaded
Test equipment connected as shown in Figure 4--7
Power-up diagnostics pass
INTERNAL_CAL test passes
1. Verify that all of the prerequisites listed previously are met for the procedure.
2. Follow the on-screen instructions to run the test for the DSO module.
3. Verify that all of the tests pass. If a test fails, check the Troubleshooting
sectiononpage4--12.
TLA Series Digitizing Oscilloscope Modules Service Manual
4- 21
Performance Verification
DSO Procedure 9:
Main Trigger Accuracy
This procedure checks the DC accuracy for the internal and external trigger level
(DC coupled) of the DSO module.
SW test name TRIG_MAIN_ACC
Equipment
required
Prerequisites Warm-up time: 30 minutes
DSO module
Function generator (item 13)
Precision BNC cable (item 12)
The logic analyzer application is not running
The performance verification and adjustment software is loaded
Test equipment connected as shown in Figure 4--8
Power-up diagnostics pass
INTERNAL_CAL test passes
CH 1
Precision BNC
cable
Function generator
Figure 4- 8: Initial setup for the main trigger accuracy test
1. Verify that all of the prerequisites listed previously are met for the procedure.
2. Follow the on-screen instructions to run the test for the DSO module.
3. Verify that all of the tests pass. If a test fails, check the Troubleshooting
sectiononpage4--12.
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TLA Series Digitizing Oscilloscope Modules Service Manual
Performance Verification
DSO Procedure 10:
Main Trigger Sensitivity
This procedure checks the sensitivity of the edge-type trigger (DC coupled) of
the DSO module.
SW test name TRIG_MAIN_SENS
Equipment
required
Prerequisites Warm-up time: 30 minutes
DSO module
Sine wave generator (item 14)
Precision BNC cable (item 12)
Type N-to-BNC adapter (item 10)
The logic analyzer application is not running
The performance verification and adjustment software is loaded
Test equipment connected as shown in Figure 4--9
Power-up diagnostics pass
INTERNAL_CAL test passes
CH 1
Precision BNC
cable
Sine wave generator
Type N-to-BNC
adapter
Figure 4- 9: Initial setup for the main trigger sensitivity test
1. Verify that all of the prerequisites listed previously are met for the procedure.
2. Follow the on-screen instructions to run the test for the DSO module.
3. Verify that all of the tests pass. If a test fails, check the Troubleshooting
sectiononpage4--12.
TLA Series Digitizing Oscilloscope Modules Service Manual
4- 23
Performance Verification
DSO Procedure 11:
Probe Compensation
This procedure checks the probe compensation output voltage of the
DSO module.
SW test name TRIG_MAIN_SENS
Equipment
required
Prerequisites Warm-up time: 30 minutes
DSO module
Digital multimeter (item 5)
Precision BNC cable (item 12)
Dual banana-to-BNC adapter (item 6)
The logic analyzer application is not running
The performance verification and adjustment software is loaded
Test equipment connected as shown in Figure 4--10
Power-up diagnostics pass
INTERNAL_CAL test passes
Probe compensation
CH 1
Precision BNC
cable
Dual
banana-to-BNC
adapter
Digital multimeter
--
+
Figure 4- 10: Initial setup for the probe compensation test
1. Verify that all of the prerequisites listed previously are met for the procedure.
2. Follow the on-screen instructions to run the test for the DSO module.
3. Verify that all of the tests pass. If a test fails, check the Troubleshooting
sectiononpage4--12.
4- 24
TLA Series Digitizing Oscilloscope Modules Service Manual
Adjustment Procedures
This section contains information needed to adjust the DSO module. Adjustments are performed using the performance verification and adjustment software.
The performance verification and adjustment software contains instructions and
control programs for adjusting the DSO module.
The software describes test equipment connections and settings, selects DSO
module setup parameters, and loads calibration constants into the DSO module
memory.
These procedures adjust the DSO module for conformance with the warranted
characteristics listed in the Specifications chapter of this manual.
These adjustments should be done whenever the DSO module fails the performance verification procedure.
Prerequisites
These procedures ask for the serial number of the DSO module under test.
Before installing the DSO module in the benchtop chassis or portable mainframe, record the serial number of the DSO module.
Alternatively, you can access the module serial number through the logic
analyzer application. In the logic analyzer application, go to the System menu,
select System Properties, and then click the DSO module tab. You must quit the
logic analyzer application before continuing with the performance verification
and adjustment software procedures.
Only trained service technicians should perform this procedure after meeting the
following requirements:
H When multiple DSO modules of the same model number are installed in the
mainframe, the performance verification and adjustment software will
address only the module in the highest slot number.
If you are testing a TLA7E1 module for example, move it to a higher slot
number than all other TLA7E1 modules in the mainframe. This method
avoids unnecessary module warm-up time.
H The logic analyzer application must not be running.
H The performance verification and adjustment software must be loaded.
H The DSO module requires a 30-minute warm-up time in a +20_ Cto+30_ C
environment before it is adjusted. Adjustments performed before the
operating temperature has stabilized may cause errors in performance.
TLA Series Digitizing Oscilloscope Modules Service Manual
5- 1
Adjustment Procedures
Using the Software
This section describes how to perform adjustments using the performance
verification and adjustment software.
Performing the
Adjustments
Adjustment Sequences
and Dependencies
There are no manual adjustments for the DSO module. The performance
verification and adjustment software adjusts the instrument hardware using
external test equipment connection you provide in response to prompts on the
screen.
Upon successful completion of each adjustment, the performance verification
and adjustment software automatically loads the new calibration data into the
DSO module memory.
The performance verification and adjustment software allows you to run groups
of adjustments, or sequences. A sequence consists of one or more individual
adjustments. Normally you will perform a RUN FULL SEQUENCE, which
executes each adjustment in the proper order. The performance verification and
adjustment software also provides instructions for running each adjustment
individually. However, you should only perform individual adjustments while
troubleshooting the DSO module.
Some adjustments depend on successful prior completion of other adjustments.
For example, all the tests associated with the Base Calibration must pass before
any other adjustments can be successfully completed.
Table 5--1 lists the tests and dependencies for each adjustment.
5- 2
TLA Series Digitizing Oscilloscope Modules Service Manual
Adjustment Procedures
Table 5- 1: DSO Adjustments and dependencies
Adjustment procedure Tests Prior completion requirements
1. Base Calibration
Adjustment
1
EXTERNAL_CAL
INTERNAL_CAL
None
Adjustment After Repair
2. Frequency Response
Adjustment
(TLA7E1 and TLA7E2 only)
3. Pulse Trigger Adjustment
4. Setup and Hold Adjustment SETUP_HOLD Base Calibration
5. Channel to Channel Skew
Adjustment
6. Probe Compensation
Adjustment
1
You must complete the EXTERNAL_CAL test before running the
INTERNAL_CAL test.
2
You must complete the GLITCH_TRIG_CAL test before running the
PNP_LATENCY_CAL test.
BANDWIDTH_CAL Base Calibration
2
GLITCH_TRIG_CAL
PNP_LATENCY_CAL
CHAN_SKEW_CAL Base Calibration
PROBE_COMP_CAL None
Base Calibration
Pulse Trigger Adjustment
You must perform a full performance verification sequence following replacement of any circuit board in the DSO module. If the performance verification
tests fail, then perform the adjustment procedure.
Test Equipment
Table 4--1 on page 4--3 lists the test equipment required to adjust the DSO
module. Item numbers under each test in these procedures correspond to the test
equipment listed in the Table 4--1.
TLA Series Digitizing Oscilloscope Modules Service Manual
5- 3
Adjustment Procedures
Adjustment Instructions
This section describes how to perform adjustments using the performance
verification and adjustment software.
Using the PV/Adjust
Software
The performance verification and adjustment software contains instructions for
performing the adjustments. The basic steps for completing the procedures
follow:
1. Start the program and enter user and product identification information.
2. Select a full adjustment sequence.
3. Connect the test equipment.
4. Run each adjustment step as instructed.
5. After completing all the adjustment steps, view the test results to confirm
that the adjustment was successful.
When a test passes, the software automatically loads new calibration data into
the DSO module memory.
NOTE. Use the dual input cable or a set of matched cables (for electrical length)
when running the CHAN_SKEW_CAL test.
If you use unmatched separate coaxial cables, the adjustment may fail or may be
miscalibrated due to an electrical mismatch between the cables.
5- 4
TLA Series Digitizing Oscilloscope Modules Service Manual
Adjustment Procedures
Troubleshooting
If any adjustments fail, use the following steps to troubleshoot the problems:
1. Check all test equipment for improper or loose connections.
2. Check that all test equipment is powered on and has the proper warm-up
time.
3. Run the adjustment procedures a second time to verify the failure.
4. If the adjustment procedures continue to fail, refer to Table 5--2 to determine
the source of the failure and then refer to the TLA7Dx/TLA7Ex Digitizing
Oscilloscope Service Manual for corrective action.
Table 5- 2: Fault isolation
Adjustment procedure Tests Possible circuit board failure
1. Base calibration
adjustment
2. Frequency response
adjustment
3. Pulse trigger adjustment GLITCH_TRIG_CAL
4. Setup and hold adjustment SETUP_HOLD A2 Acquisition board
EXTERNAL_CAL
INTERNAL_CAL
BANDWIDTH_CAL A2 Acquisition board
PNP_LATENCY_CAL
A2 Acquisition board
A2 Acquisition board
Adjustment Procedures
5. Channel to channel skew
adjustment
6. Probe compensation
adjustment
CHAN_SKEW_CAL A2 Acquisition board
PROBE_COMP_CAL A1 Processor board
Each of the following adjustment procedures corresponds to one or more
adjustment control programs in the performance verification and adjustment
software. Refer to the following procedures to identify the initial setup for each
test. Then follow the program instructions to complete the tests.
TLA Series Digitizing Oscilloscope Modules Service Manual
5- 5
Adjustment Procedures
DSO Procedure 1:
Base Calibration
This procedure performs an internal and external calibration on the DSO module.
The
INTERNAL_CAL test is the performance verification and adjustment software
equivalent of SELF
SW test names
Equipment
required
Prerequisites Warm-up time: 30 minutes
1
Install the 0.1 F capacitor across the voltage reference output terminals to reduce
noise.
DSO module
_CAL.
EXTERNAL_CAL, INTERNAL_CAL
Voltage reference (item 7)
Precision BNC cable (item 12)
Dual banana-to-BNC adapter (item 6)
Capacitor, 0.1 F
1
(item 8)
Test equipment connected as shown in Figure 5--1
Power-up diagnostics pass
No previous tests required
CH 1
Precision BNC
cable
Voltage reference
+
--
0.1 F Capacitor
Dual
banana-to-BNC
adapter
Figure 5- 1: Initial setup for the base calibration adjustment
5- 6
TLA Series Digitizing Oscilloscope Modules Service Manual
Adjustment Procedures
1. If the logic analyzer application is running, quit the application.
2. Load the performance verification and adjustment software as described in
the Software Installation and Removal on page 2--4.
3. Verify that all of the prerequisites listed previously are met for the procedure.
4. Run the performance verification and adjustment software as described in
Using the Software on page 4--9. Select TLA_dig, then select the correct
module type and the ADJ test option.
5. Follow the on-screen instructions to run the
EXTERNAL_CAL test for the DSO
module.
6. Verify that
equipment and performing the
the EXTERNAL_CAL test passes before disconnecting the test
INTERNAL_CAL test.
7. Verify that these tests pass before continuing with any other tests.
TLA Series Digitizing Oscilloscope Modules Service Manual
5- 7
Adjustment Procedures
DSO Procedure 2:
Frequency Response
Adjustment
This procedure adjusts the frequency response of the TLA7E1 and the TLA7E2
DSO modules.
SW test names BANDWIDTH_CAL
Equipment
required
Prerequisites Warm-up time: 30 minutes
1
The output frequency of the sine wave generator must maintain a constant output
amplitude within 0.35 dB of the reference frequency (10 MHz) through the bandwidth
calibration frequency range (1005 MHz).
2
If you require a power meter to maintain a constant output amplitude use the
equipment setup as shown in Figure 5- 3.
Sine wave generator1(item 14)
Precision BNC cable (item 12)
Type N-to-BNC adapter (item 16)
The logic analyzer application is not running
Test equipment connected as shown in Figure 5--2
Power-up diagnostics pass
Base Calibration completed
2
DSO module
Sine wave generator
CH 1
Precision
BNC cable
Type N-to-BNC
adapter
Figure 5- 2: Initial setup for the frequency response adjustment
5- 8
TLA Series Digitizing Oscilloscope Modules Service Manual
Adjustment Procedures
Power meter and Power sensor (item 15)
DSO module
CH 1
SMA-to-BNC
adapter
(item 18)
BNC-to-BNC
adapter (item 4)
Type N-to-BNC adapter (item 16)
SMA-to-BNC adapter (item 18)
Power divider (item 17)
SMA-to-BNC adapter (item 18)
Sine wave generator (item 14)
Type N-to-BNC
adapter (item 16)
Precision BNC
cable
Figure 5- 3: Using a power meter to monitor the amplitude of the sine wave
generator during the frequency response adjustment
1. Verify that all of the prerequisites listed previously are met for the procedure.
2. Follow the on-screen instructions to run all of the tests for the DSO module.
NOTE. All of the tests that are listed must be run. There are no optional tests.
3. Verify no failures occur for each test. If a test continues to fail, check the
Troubleshooting sectiononpage5--5.
TLA Series Digitizing Oscilloscope Modules Service Manual
5- 9
Adjustment Procedures
DSO Procedure 3:
Pulse Trigger Adjustment
This procedure adjusts the pulse trigger of the DSO module.
SW test names GLITCH_TRIG_CAL, PNP_LATENCY_CAL
Equipment
required
Prerequisites Warm-up time: 30 minutes
No changes from the previous test (Frequency Response Adjustment),
unless power meter was used
The logic analyzer application is not running
Test equipment connected as shown in Figure 5--2
Power-up diagnostics pass
Base Calibration completed
1. Verify that all of the prerequisites listed previously are met for the procedure.
2. Follow the on-screen instructions to run all of the tests for the DSO module.
NOTE. All of the tests that are listed must be run. There are no optional tests.
3. Verify no failures occur for each test. If a test continues to fail, check the
Troubleshooting sectiononpage5--5.
5- 10
TLA Series Digitizing Oscilloscope Modules Service Manual
Adjustment Procedures
DSO Procedure 4:
Setup and Hold
Adjustment
This procedure adjusts the setup and hold parameters of the DSO module.
SW test names SETUP_HOLD_CAL
Equipment
required
Prerequisites Warm-up time: 30 minutes
No change from previous test
The logic analyzer application is not running
Test equipment connected as shown in Figure 5--2
Power-up diagnostics pass
Base Calibration and Pulse Trigger adjustment completed
1. Verify that all of the prerequisites listed previously are met for the procedure.
2. Follow the on-screen instructions to run the test for the DSO module.
3. Verify no failures occur for each test. If a test continues to fail, check the
Troubleshooting sectiononpage5--5.
TLA Series Digitizing Oscilloscope Modules Service Manual
5- 11
Adjustment Procedures
DSO Procedure 5:
Channel-to-Channel Skew
Adjustment
This procedure adjusts the channel-to-channel skew parameters of the
DSO module.
SW test names CHAN_SKEW_CAL
Equipment
required
Prerequisites Warm-up time: 30 minutes
1
Use the dual input cable or a set of matched cables when running this test. If you
use unmatched coaxial cables, the test may fail or may be mis-calibrated due to an
electrical mismatch between the cables.
DSO module
Sine wave generator (item 14)
Precision BNC cable (item 12)
Dual input BNC cable
Type N-to-BNC adapter (item 10)
The logic analyzer application is not running
Test equipment connected as shown in Figure 5--4
Power-up diagnostics pass
Base Calibration completed
CH 1
1
(item 9)
Precision BNC
cable
Dual input
cable
Sine wave generator
Type N-to-BNC
adapter
Figure 5- 4: Initial setup for the channel-to-channel skew adjustment
1. Verify that all of the prerequisites listed previously are met for the procedure.
2. Follow the on-screen instructions to run the test for the DSO module.
3. Verify no failures occur for each test. If a test continues to fail, check the
Troubleshooting sectiononpage5--5.
5- 12
TLA Series Digitizing Oscilloscope Modules Service Manual
Adjustment Procedures
DSO Procedure 6:
Probe Compensation
Adjustment
This procedure adjusts the probe compensation output voltage of the DSO
module.
SW test names PROBE_COMP_CAL
Equipment
required
Prerequisites Warm-up time: 30 minutes
DSO module
Precision BNC
cable
Digital multimeter (item 5)
Precision BNC cable (item 12)
Dual banana-to-BNC adapter (item 6)
The logic analyzer application is not running
Test equipment connected as shown in Figure 5--5
Power-up diagnostics pass
INTERNAL_CAL test pass
Probe compensation
CH 1
Digital multimeter
--
+
Dual
banana-to-BNC
adapter
Figure 5- 5: Initial setup for the probe compensation test
1. Verify that all of the prerequisites listed previously are met for the procedure.
2. Follow the on-screen instructions to run the test for the DSO module.
3. Verify no failures occur for each test. If a test continues to fail, check the
Troubleshooting sectiononpage5--5.
TLA Series Digitizing Oscilloscope Modules Service Manual
5- 13
Adjustment Procedures
Completing the Adjustment Steps
After completing the adjustments, obtain a copy of the test results and verify that
all tests passed. Run the Performance Verification Procedures to verify that all
the parameters are within the allowable specifications.
5- 14
TLA Series Digitizing Oscilloscope Modules Service Manual
Maintenance
This chapter contains the information needed to do periodic and corrective
maintenance on the DSO module. The following sections are included:
H The Maintenance section provides general information on preventing
damage to internal circuit boards when doing maintenance, lithium battery
warnings and disposal instructions, and procedures for inspecting the DSO
module and cleaning its external and internal parts.
H The Removal and Installation Procedures (page 6--7) provide procedures for
the removal and installation of circuit boards.
H Troubleshooting (page 6--25) provides information for isolating failed circuit
boards. Included are system-level instructions that isolate faults within your
system, and troubleshooting trees that use the internal self tests and DC
voltage measurements to isolate faults to a faulty circuit board.
H Repackaging Instructions provides packaging information for shipment or
storage.
Related Maintenance Procedures
The following chapters contain information/procedures related to maintenance.
H The Performance Verification chapter contains tests that may be useful in
isolating problems by testing DSO module performance.
H The Adjustment Procedures chapter contains a procedure for adjusting the
internal circuits of the DSO module. The procedure may be used after repairs
are made, or for periodic adjustments.
Preventing ESD
When performing any service which requires internal access to the DSO module,
adhere to the following precautions to avoid damaging internal circuit boards and
their components due to electrostatic discharge (ESD).
CAUTION. Static discharge can damage any semiconductor component in this
DSO module.
1. Minimize handling of static-sensitive circuit boards.
TLA Series Digitizing Oscilloscope Modules Service Manual
6- 1
Maintenance
Battery Disposal
2. Transport and store static-sensitive circuit boards in their static protected
containers or on a metal rail. Label any package that contains static-sensitive
boards.
3. Discharge the static voltage from your body by wearing a grounded antistatic
wrist strap while handling these circuit boards. Do service of static-sensitive
circuit boards only at a static-free work station.
4. Nothing capable of generating or holding a static charge should be allowed
on the work station surface.
5. Handle circuit boards by the edges when possible.
6. Do not slide the circuit boards over any surface.
7. Avoid handling circuit boards in areas that have a floor or work-surface
covering capable of generating a static charge.
WARNING. To avoid personal injury, observe the proper procedures for handling
lithium batteries. Improper handling can cause fire, explosion, or severe burns.
Do not recharge, crush, disassemble, heat above 100° C (212° F), incinerate, or
expose the battery to water.
The DSO module contains one lithium battery, A1U70, located on the Processor
Board (A1). Battery replacement is accomplished by installing a new Processor
Board (A1). Read the following information before replacing the battery. See
Processor Board on page 6--13 for replacement instructions.
Dispose of lithium batteries according to local, state, and federal regulations.
In the United States, you can typically dispose of small quantities (less than 20)
of batteries with ordinary garbage in a sanitary landfill. You must send larger
quantities by surface transport to a hazardous waste disposal facility. Package the
batteries individually to prevent shorting. Then, pack them in a sturdy container
that is clearly labelled: Lithium Batteries — DO NOT OPEN.
Inspection and Cleaning
This section describes how to inspect for dirt and damage, and how to clean the
DSO module. Inspection and cleaning are done as preventive maintenance.
Preventive maintenance, when done regularly, may prevent malfunctions and
enhance reliability.
6- 2
TLA Series Digitizing Oscilloscope Modules Service Manual
Maintenance
Preventive maintenance consists of visually inspecting and cleaning the DSO
module, and using general care when operating it. How often to do maintenance
depends on the severity of the environment in which the DSO module is used. A
proper time to perform preventive maintenance is just before adjustment of the
DSO module.
General Care
Inspection and Cleaning
Procedures
The side cover keeps dust out of the DSO module and should be in place during
normal operation.
Inspect and clean the DSO module as often as operating conditions require. The
collection of dirt on internal components can cause them to overheat and
breakdown. Dirt acts as an insulating blanket, preventing efficient heat dissipation. Dirt also provides an electrical conduction path that could cause a DSO
module failure, especially under high-humidity conditions.
CAUTION. Avoid the use of chemical cleaning agents that might damage the
plastics and external labels used in the DSO module.
Use a cloth dampened with water to clean external surfaces.
To clean internal surfaces, use a 75% isopropyl alcohol solution as a cleaner
and rinse with deionized water.
Before using any other type of cleaner, consult your Tektronix Service Center or
representative.
Inspection — Exterior. Inspect the outside of the DSO module for damage, wear,
and missing parts. Use Table 6--1 as a guide. Instruments that appear to have
been dropped or otherwise abused should be checked thoroughly to verify correct
operation and performance. Immediately repair defects that could cause personal
injury or lead to further damage to the DSO module or the mainframe in which it
is used.
TLA Series Digitizing Oscilloscope Modules Service Manual
6- 3
Maintenance
Table 6- 1: External inspection check list
Item Inspect for Repair action
Front panel and side
cover
Cracks, scratches, deformations,
missing or damaged retainer
screws, ejector handles, or
gaskets.
Replace defective or missing
parts.
Front panel connectors Broken shells, cracked insulation,
and deformed contacts. Dirt in
connectors.
Rear connectors Cracked or broken shells, dam-
aged or missing contacts. Dirt in
connectors.
Accessories Missing items or parts of items,
bent pins, broken or frayed
cables, and damaged connectors.
Replace defective parts. Clear or
wash out dirt.
Replace defective parts. Clear or
wash out dirt.
Replace damaged or missing
parts, frayed cables, and defective circuit boards.
CAUTION. To prevent damage to electrical components from moisture during
external cleaning, use only enough liquid to dampen the cloth or applicator.
Cleaning Procedure — Exterior. To clean the DSO module exterior, perform the
following steps:
1. Remove loose dust on the outside of the DSO module with a lint free cloth.
2. Remove remaining dirt with a lint free cloth dampened with water. Do not
use abrasive cleaners.
6- 4
Inspection — Interior. Remove the module cover to access the inside of the DSO
module for inspection and cleaning.
Inspect the internal portions of the DSO module for damage and wear using
Table 6--2 as a guide. Defects found should be repaired immediately.
TLA Series Digitizing Oscilloscope Modules Service Manual
Table 6- 2: Internal inspection check list
Item Inspect for Repair action
Circuit boards Loose, broken, or corroded
solder connections. Burned
circuit boards. Burned, broken,
or cracked circuit-run plating.
Remove failed board and replace with a
new part.
Maintenance
Resistors or semiconductors
Solder connections Cold solder or rosin joints. Resolder joint and clean with isopropyl
Capacitors Damaged or leaking cases.
Wiring and cables Loose plugs or connectors.
Chassis Dents, deformations, and
Burned, cracked, broken,
blistered condition.
Corroded solder on leads or
terminals.
Burned, broken, or frayed
wiring.
damaged hardware.
Remove failed board and replace with a
new part.
alcohol.
Remove failed board and replace with a
new part.
Firmly seat connectors. Repair or replace
parts with defective wires or cables.
Straighten, repair, or replace defective
hardware.
CAUTION. To prevent damage from electrical arcing, ensure that circuit boards
and components are dry before applying power to the DSO module.
Cleaning Procedure — Interior. To clean the DSO module interior, perform the
following steps:
1. Blow off dust with dry, low-pressure, deionized air (approximately 9 psi).
2. Remove any remaining dust with a lint free cloth dampened in isopropyl
alcohol (75% solution) and rinse with warm deionized water. (A cottontipped applicator is useful for cleaning in narrow spaces and on circuit
boards.)
NOTE. If, after performing steps 1 and 2, a part is clean upon inspection, skip
the remaining steps.
If steps 1 and 2 do not remove all the dust or dirt, the DSO module may be spray
washed using a solution of 75% isopropyl alcohol (see steps 3 through 7).
3. Gain access to the parts to be cleaned by removing easily accessible shields
and panels.
TLA Series Digitizing Oscilloscope Modules Service Manual
6- 5
Maintenance
4. Spray wash dirty parts with the isopropyl alcohol and wait 60 seconds for the
majority of the alcohol to evaporate.
5. Use hot (48.9_ Cto60_ C/120_ F to 140_ F) deionized water to thoroughly
rinse the parts.
6. Dry all parts with low-pressure, deionized air.
7. Dry all components and assemblies in an oven or drying compartment using
low-temperature (51.7_ C to 65.6_ C/125_ F to 150_ F) circulating air.
6- 6
TLA Series Digitizing Oscilloscope Modules Service Manual
Removal and Installation Procedures
This section describes how to remove and install the major mechanical and
electrical modules.
WARNING. Before doing this or any other procedure in this manual, read the
General Safety Summary and Service Safety Summary found at the beginning of
this manual.
T o prevent possible injury to service personnel or damage to electrical components, read Preventing ESD on page 6--1.
Summary of Procedures
The procedures are listed below in the order in which they appear in this section:
H Injector/Ejector Handles on page 6--8 describes how to replace the module
ejector handles
H Cover on page 6--10 describes how to replace the module cover
H Processor Board on page 6--13 describes how to replace the Processor
Board (A1) (Performance verification is required if this board is replaced)
H Probe Compensation BNC Connector on page 6--16 describes how to replace
the five front panel BNC connectors (not channel input connectors)
H Fuses on page 6--17 describes how to replace the BNC connector fuses, and
fuses related to power supplies
H Probe Interface on page 6--19 describes how to replace the probe interface
flex circuit
H Acquisition Board on page 6--22 describes how to replace the Acquisition
Board (A2) (Performance verification is required if this board is replaced)
H Rear EMI Gaskets on page 6--23 describes how to replace the EMI gaskets at
the rear of the module
TLA Series Digitizing Oscilloscope Modules Service Manual
6- 7
Removal and Installation Procedures
Tools Required
Most modules in the DSO module can be removed using a screwdriver handle
mounted with size T-10 and T-15 TorxR screwdriver bits. Table 6--3 lists the
tools needed to replace modules in the DSO module.
Table 6- 3: Tools required for parts replacement
Item
number
1 Screwdriver handle Accepts TorxR driver bits
2 T-10 Torx tip To rx R driver bit for T-10 size screw heads
3 T-15 Torx tip To rx R driver bit for T-15 size screw heads
4 One-half inch (1/2) nut driver Standard tool
5 One-quarter (1/4) inch nut driver Standard tool
6 Soldering iron Standard tool
7 Solder wick Standard tool
8 Three-sixteenth (3/16) inch nut
Name Description
Standard tool
driver
Injector/Ejector Handles
Removal
You will need a screwdriver with a size T-10 TorxR tip (Table 6--3, items 1
and 2) to replace the ejector handles.
Use the following procedure and Figure 6--1 to remove the injector/ejector
handles.
1. Place the DSO module on its right side.
2. Remove the two screws that secure the injector/ejector handle to the chassis.
3. Remove the injector/ejector handle from the DSO module.
6- 8
TLA Series Digitizing Oscilloscope Modules Service Manual
Removal and Installation Procedures
Remove screws (4)
Installation
Ejector handle (2)
Figure 6- 1: Injector/ejector handle replacement
Use the following procedure and Figure 6--1 to install the ejector handles.
NOTE. The top and bottom injector/ejector handles are not interchangeable. The
top injector/ejector handle assembly has a notch on the right side and a tab on
the left side; the bottom injector/ejector assembly does not have a notch or a tab.
1. Install the ejector handle through the front panel cutout onto the mounting
post.
2. Install the screws to secure the injector/ejector handle to the chassis.
3. Apply the proper replacement label.
TLA Series Digitizing Oscilloscope Modules Service Manual
6- 9
Removal and Installation Procedures
Cover
You will need a screwdriver with a size T-10 TorxR tip (Table 6--3, items 1
and 2) to replace the cover.
Removal
Use the following procedure and Figure 6--2 to remove the cover.
1. Place the module on its right side (power-requirements label facing down).
2. Remove four (4) screws that secure the rear panel to the chassis (Figure 6--2).
Set the rear panel aside.
3. Remove four (4) screws that secure the cover to the chassis.
4. Lift the cover from the chassis.
Cover
Remove screws (8)
6- 10
Chassis
Rear panel
Figure 6- 2: Cover removal
TLA Series Digitizing Oscilloscope Modules Service Manual
Removal and Installation Procedures
Installation
Use the following procedure and Figures 6--2 and 6--3 to install the cover.
NOTE. The cover must be installed tightly against the chassis. This will ensure
that the DSO module fits into any two adjacent slots in the mainframe.
1. Place the module on its right side.
2. Place the cover onto the chassis.
CAUTION. To prevent damage to the module during the installation process,
reinstall the cover exactly as described in steps 3 through 5. If the cover is not
properly seated, the module can be damaged when you install it in a mainframe
or it will not meet EMC requirements.
3. Push forward on the cover so the tab on the front edge of the cover inserts
into the rear of the front subpanel. Make sure that the cover is fully seated
(no gaps) against the front and rear chassis flanges (see Figure 6--3).
4. While holding the module cover in place, install the four (4) screws nearest
the front of the module, to secure the cover to the chassis.
5. Install four (4) screws that secure the rear panel to the chassis.
TLA Series Digitizing Oscilloscope Modules Service Manual
6- 11
Removal and Installation Procedures
Leave no vertical gap
Figure 6- 3: Seating the cover on the chassis
Make sure tab inserts into
slot on rear of front panel
6- 12
TLA Series Digitizing Oscilloscope Modules Service Manual
Processor Board
Removal and Installation Procedures
You will need a screwdriver with a size T-10 TorxR tip (Table 6--3, items 1
and 2) to replace the Processor Board.
Removal
Use the following procedure and Figure 6--4 to remove the Processor Board.
NOTE. After replacing the Processor Board, you must verify operation and you
must perform the adjustment and Performance Verification procedures as
described in the TLA 700 Series Performance Verification and Adjustment
Technical Reference (070--9776--XX).
When ordering a replacement or exchange processor board from Tektronix, you
must supply the following information: model number, serial number, and
firmware level.
1. Perform the Cover removal procedure (see page 6--10).
2. Unplug two 100-pin ribbon cables from J6 and J9.
3. Remove six (6) screws that secure the Processor Board to the chassis.
4. Carefully move the Processor Board away from the front panel until the tab
(Figure 6--4) clears the front subpanel.
5. Lift the board above the chassis. Then unplug the yellow/white coaxial cable
from J3.
TLA Series Digitizing Oscilloscope Modules Service Manual
6- 13
Removal and Installation Procedures
Remove screws (6)
J3
(under board)
Tab
Processor board
Figure 6- 4: Processor board removal
J5
J6
J9
100-pin ribbon
cable (2)
6- 14
Installation
Use the following procedure and Figure 6--4 to install the Processor Board.
NOTE. After replacing the Processor Board, you must verify operation and you
must perform the adjustment and Performance Verification procedures as
described in this manual.
When ordering a replacement or exchange processor board from Tektronix, you
must supply the following information: model #, serial #, and firmware level.
1. Hold the Processor Board above the chassis and install the yellow/white
coaxial cable at J3.
2. Insert the tab on the Processor Board into the front subpanel as shown in
Figure 6--5. Then set the Processor Board in place on the chassis.
TLA Series Digitizing Oscilloscope Modules Service Manual
Tab o n
processor board
Removal and Installation Procedures
Front
subpanel slot
Push forward on
P1 connector
during installation.
Chassis
Figure 6- 5: Inserting processor board tab into front subpanel
3. Push forward on the Processor Board P1 connector. To ensure proper
alignment, the tab must be fully inserted into the front subpanel slot.
4. While holding the Processor Board in place, install the six (6) screws that
secure the Processor Board to the chassis.
5. Install the two 100-pin ribbon cables at J6 and J9.
6. Perform the Cover installation procedure (see page 6--11).
TLA Series Digitizing Oscilloscope Modules Service Manual
6- 15
Removal and Installation Procedures
Probe Compensation BNC Connector
You will need a screwdriver with a size T-10 TorxR tip and a 1/2 inch nut driver
(Table 6--3, items 1, 2, and 4) to replace the BNC connector for PROBE
COMPENSATION.
NOTE. Only remove and replace the Probe Compensation BNC Connector.
Do not remove and replace the Channel 1 through 4 BNC’s.
Removal
Use the following procedure and Figure 6--6 to remove the Probe Compensation
BNC connector.
1. Perform the Processor Board removal procedure (see page 6--13).
2. Unplug the coaxial cable from the rear of the BNC.
3. Using a 1/2 inch nut driver, remove the securing nut and washer from the
rear of the connector.
4. Remove the BNC from the front panel.
6- 16
Nut
Washer
Probe compensation
BNC connector
Figure 6- 6: BNC replacement
TLA Series Digitizing Oscilloscope Modules Service Manual
Removal and Installation Procedures
Fuses
Installation
Use the following procedure and Figure 6--6 to install the Probe Compensation
BNC connector.
1. Insert the BNC through the hole in the front panel.
2. Slide the washer onto the BNC, so it rests against the back side of the front
panel.
3. Using a 1/2 inch nut driver, install the securing nut onto the rear of the
connector.
4. Plug the coaxial cable into the rear of the BNC.
5. Perform the Processor Board installation procedure (see page 6--14).
CAUTION. To avoid damage to the DSO module, use only replacement fuses that
match the type, voltage, and current rating of the original fuse. See the
Mechanical Parts List section for the part number of replacement fuses.
You will need a screwdriver with a size T-10 TorxR tip, a soldering iron, and
solder wick (Table 6--3, items 1, 2, 6, and 7) to replace the fuses.
Removal
Use the following procedure and Figure 6--7 to remove the fuses.
1. Perform the Processor Board removal procedure (see page 6--13).
2. Use Figure 6--7 to locate the fuse to be replaced.
3. Using a soldering iron and solder wick, unsolder and discard the fuse.
TLA Series Digitizing Oscilloscope Modules Service Manual
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Removal and Installation Procedures
Processor board
F13
F4
F2
F12
F1
F5
Circuit number Circuit board Purpose
F1 Processor Board +12 V
F2 Processor Board +5 VD
F4 Processor Board --5.2 V
F5 Processor Board --12 V
F12 Processor Board +5V
F13 Processor Board Probe Compensation Output
Installation
Figure 6- 7: Fuse replacement
Use the following procedure and Figure 6--7 to install the fuses.
CAUTION. To avoid damage to the DSO module, use only replacement fuses that
match the type, voltage, and current rating of the original fuse. See the
Mechanical Parts List section for the part number of replacement fuses.
1. Using a soldering iron, solder the new fuse into place.
2. Perform the Processor Board installation procedure (see page 6--14).
6- 18
TLA Series Digitizing Oscilloscope Modules Service Manual
Probe Interface
Removal and Installation Procedures
You will need a screwdriver with size T -10 and T-15 TorxR tips and a 1/4 inch
nut driver (Table 6--3, items 1, 2, 3, and
5) to replace the probe interface.
Removal
Use the following procedure and Figure 6--8 to remove the probe interface.
1. Perform the Cover removal procedure (see page 6--10).
2. Perform the Processor Board removal procedure (see page 6--13).
3. Using a 1/4 inch nut driver, remove six (6) spacer posts that secure the
Acquisition Board to the chassis.
4. Using a screwdriver with a T-15 TorxR tip, remove three (3) screws that
secure the Acquisition Board to the front panel.
CAUTION. To avoid damage to the plastic probe adapter rings during Acquisition
Board removal, be sure the BNC connectors do not get caught on the probe
adapter rings during removal.
5. Carefully slide the Acquisition Board away from the front panel until the
BNC connectors clear the front subpanel. Then lift the module from the
chassis.
6. If necessary, remove the plastic probe adapter rings from the BNC connectors on the attenuator housing. The plastic rings often remain in the front
panel during Acquisition Board removal.
7. Unlock socket J1163 (slide the lock tabs away from the attenuator housing).
8. Remove the probe interface from J1163. Then carefully slide the probe
interface from around each BNC connector on the Acquisition Board.
TLA Series Digitizing Oscilloscope Modules Service Manual
6- 19
Removal and Installation Procedures
Plastic rings (4)
Remove spacer posts (6)
Acquisition board
Remove screws (3)
Probe interface
Figure 6- 8: Probe interface replacement
Probe interface
Slide the tabs to
Slide tabs to
unlock J1163
unlock J1163
6- 20
TLA Series Digitizing Oscilloscope Modules Service Manual
Removal and Installation Procedures
Installation
Use the following procedure and Figure 6--8 to install the probe interface.
NOTE. Be sure the RF shielding gasket is installed on the BNC connectors before
installing the probe interface.
1. Install the probe interface over the BNC connectors on the Acquisition
Board.
2. Carefully bend the probe interface cable as shown in Figure 6--8. Then install
the probe interface into socket J1163 on the Acquisition Board.
3. Lock J1163 (slide the lock tabs toward the attenuator housing).
4. If necessary, turn the front panel face down and insert the plastic rings into
holes in the front panel. The plastic rings may already be installed if they
stayed in the front panel during Acquisition Board removal.
5. Turn the front panel face down and carefully slide the Acquisition Board into
the front panel until the BNC connectors clear the front subpanel. Then lay
the module onto the chassis. Be sure the attenuator housing is flush with the
back side of the front panel.
6. Using a screwdriver with a T-15 TorxR tip, install three (3) screws that
secure the Acquisition Board to the front panel.
7. Using a 1/4 inch nut driver, install six (6) spacer posts that secure the
Acquisition Board to the chassis.
8. Perform the Processor Board installation procedure (see page 6--14).
TLA Series Digitizing Oscilloscope Modules Service Manual
6- 21
Removal and Installation Procedures
Acquisition Board
You will need a screwdriver with size T -10 and T-15 TorxR tips and a 1/4 inch
nut driver (Table 6--3, items 1, 2, 3, and 5) to replace the Acquisition Board.
Removal
Use the following procedure and Figure 6--9 to remove the Acquisition Board.
NOTE. After replacing the Acquisition Board, you must verify operation and
perform the adjustment and Performance Verification procedures.
1. Perform the Probe Interface removal procedure (see page 6--19).
2. Remove the RF shielding gasket from the BNC connectors. Set the shield
aside.
3. Unplug two (2) 100-pin ribbon cables from J100 and J101 as follows:
a. Grasp and squeeze the metal cable retainers (Figure 6--9) to unlock the
cable from its connector.
b. Unplug the cable from the Acquisition Board. Set the cable aside.
100-pin
ribbon cables
6- 22
Squeeze to
unlock cable.
RF shielding gasket
Figure 6- 9: Acquisition board replacement
TLA Series Digitizing Oscilloscope Modules Service Manual
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