Tektronix DSA8300 Digital Serial Analyzer,Modules Service

DSA8300

ZZZ

Digital Serial Analyzer and Modules

Service Manual

*P077057200*

077-0572-00

DSA8300

ZZZ

Digital Serial Analyzer and Modules

Service Manual

www.tektronix.com

077-0572-00

Copyright © Tektronix. All rights reserved. Licensed software products are owned by Tektronix or its subsidiaries or suppliers, and are protected by national copyright laws and international treaty provisions.

Tektronix products are covered by U.S. and foreign patents, issued and pending. Information in this publication supersedes that in all previously published material. Speciﬁcations and price change privileges reserved.

TEKTRONIX and TEK are registered trademarks of Tektronix, Inc.

Contacting Tektronix

Tektronix, Inc. 14150 SW Karl Braun Drive P.O. B o x 5 0 0 Beaverto USA

For product information, sales, service, and technical support:

n, OR 97077

In North America, call 1-800-833-9200. Worl dwid e, visi t www.tektronix.com to ﬁnd contacts in your area.

Warranty

Tektronix warrants that this product will be free from defects in materials and workmanship for a period of one (1) year from the date of shipment. If any such 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. Parts, modules and replacement products used by Tektronix for warranty work may be n the property of Tektronix.

ew or reconditioned to like new performance. All replaced parts, modules and products become

In order to o 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 designated 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 shall be responsible for paying 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 result b) to repair damage resulting from improper use or connection t o incompatible equipment; c) to repair any damage 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 WARRANTY IS GIVEN BY TEKTRONIX WITH RESPECT TO THE PRODUCT 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.

TRONIX' RESPONSIBILITY TO REPAIR OR REPLACE DEFECTIVE PRODUCTS IS THE SOLE

TEK AND EXCLUSIVE REMEDY PROVIDED TO THE CUSTOMER FOR BREACH OF THIS WARRANTY. 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.

[W2 – 15AUG04]

btain service under this warranty, Customer must notify Tektronix of the defect before the expiration of

ing from attempts by personnel other than Tektronix representatives to install, repair or service the product;

Table of Contents

General Safety Summary ......................................................................................... vi

Service Safety Summary.............. .................................. ................................ ......... viii

Preface .............................................................................................................. ix

Related Documentation ....................................................................................... x

Operating Information

Operating Information ........................................................................................... 1-1

Windows Safe Mode ........... .................................. ................................ ........... 1-1

Where to Find User Information ........................................................................... 1-1

Theory of Operation

Theory of Operation............................... ................................ ............................... 2-1

Mainframe Overview........................................................................................ 2-2

Electrical Sampling Modules .............................. ................................ ................. 2-4

Optical Sampling Modules ...... ................................ .................................. ......... 2-6

80A01 Trigger Prescale Preampliﬁer Module .......................................................... 2-13

80A02 EOS/ESD Protection Module.................................................................... 2-14

80A05 Electrical Clock Recovery Module.............................................................. 2-14

82A04 Phase Reference Module......................................................................... 2-15

Adjustment Procedures

Adjustment Procedures .......................................................................................... 3-1

Required Equipment.............................. ................................ ........................... 3-1

Equipment Hookup............. ................................ ................................ ............. 3-2

Main Instrument Adjustments ........................... .................................. ................. 3-2

DC Calibrator Adjust ................................................................................... 3-2

DC Calibrator Adjust Veriﬁcation..................................................................... 3-3

Internal 10 MHz Adjust ................... .................................. ........................... 3-4

Maintenance

Maintenance....................................................................................................... 4-1

Preventing ESD .............................................................................................. 4-1

Inspection and Cleaning........................ ................................ ............................. 4-1

Removal and Installation ............... ................................ .................................. ....... 4-5

Required Equipment.............................. ................................ ........................... 4-5

External Assemblies......................................................................................... 4-6

Line Fuses and AC Power Cord....................................................................... 4-7

DSA8300 Digital Serial Analyzer and Modules Service Manual i

Table of Contents

Front-Panel Kn

Trim and Carrying Handle ............................................................................. 4-9

Bottom Cover............................... ................................ ........................... 4-10

Left and Right Covers ................................................................................ 4-10

Internal Assemblies................... ................................ .................................. ... 4-11

Front-Panel Assembly................. ................................ ............................... 4-12

Front Panel Board..................................................................................... 4-13

Front Panel Keypad............................................ ................................ ....... 4-14

Display Assembly.................................. ................................ ................... 4-14

Display Adapter Board ............................................................................... 4-16

Standby/On Switch Flex Circuit .................................................................... 4-18

USB Assembly........................................................................................ 4-19

Hard Disk Drive....................................................................................... 4-20

CD-RW/DVD Drive Assembly...................................................................... 4-22

CD-RW/DVD and Hard Disk Drive Mounting Frame............................................ 4-24

ATX Assembly ........................................................................................ 4-25

Power PC Board............................ ................................ ........................... 4-28

Power Side Board ........................ ................................ ............................. 4-30

Bridge Board ................. ................................ .................................. ....... 4-30

Fan Assembly ......................................................................................... 4-31

Low-Voltage Power Supply....................... .................................. ................. 4-33

Module Slot Doors................................... ................................ ................. 4-40

Electrical Sampling Modules .............................. ................................ ............... 4-45

Optical Sampling Modules ...... ................................ .................................. ....... 4-48

80A00 and 82A00 Series Modules ............... ................................ ....................... 4-48

Troubleshooting................................................................................................. 4-50

Required Equipment....................................................................................... 4-50

Check for Common Problems............................................................................ 4-50

Isolating Failures to the 80E0X/80C0X Modules or the Mainframe................ ................. 4-53

Isolating to a Board If Power Will Not Come Up................... .................................. . 4-54

Checking the Power Supply Voltages ................................................................... 4-55

PPC and ATX PC Diagnostics................. .................................. ......................... 4-56

BIOS Beep Codes................................. .................................. ....................... 4-57

Firmware Updates ......................................................................................... 4-58

After Repair ................... ................................ ................................ ............. 4-58

Installing the Instrument Model and Serial Number .... . ..... . ..... ..... . ..... . ..... . .... . ..... . ..... . 4-59

Repackaging Instructions ...................................................................................... 4-60

obs..... ................................ ................................ ................. 4-8

Replaceable Parts L ist

Replaceable Parts List............................................................................................ 5-1

ii DSA8300 Digital Serial Analyzer and Modules Service Manual

List of Figures

Figure 2-1: DSA8300 block diagram .......................................................................... 2-2

Figure 4-1: External assemblies ............. ................................ .................................. . 4-6

Figure 4-2: Knob removal........ ................................ .................................. ............. 4-8

Figure 4-3: Internal assemblies ............................................................................... 4-11

Figure 4-4: J1 ﬂex cable connector removal ................................................................ 4-13

Figure 4-5: Display assembly removal........................ ................................ ............... 4-16

Figure 4-6: Display adaptor board removal ................................................................. 4-17

Figure 4-7: Display adaptor board replacement............................ ................................ . 4-18

Figure 4-8: USB assembly removal .......................................................................... 4-19

Figure 4-9: Hard disk drive removal ......................................................................... 4-21

Figure 4-10: CD-RW/DVD assembly removal............... ................................ ............... 4-22

Figure 4-11: CD-RW/DVD drive removal................................................................... 4-23

Figure 4-12: Hard drive and CD-RW/DVD drive mounting frame removal............................. 4-25

Figure 4-13: ATX assembly removal.................................... ................................ ..... 4-27

Figure 4-14: Power PC board removal....................................................................... 4-29

Figure 4-15: Fan assembly removal ................... ................................ ....................... 4-32

Figure 4-16: Acquisition System ............................................................................. 4-35

Figure 4-17: T-10 screws and threaded posts....................... .................................. ....... 4-36

Figure 4-18: Module slot door removal......................................... ............................. 4-41

Figure 4-19: Module ejector handles removal .............................................................. 4-43

Figure 4-20: Spring arm position ..... . ..... . ..... . ..... . ..... . ... . . . .... . . .... . ..... . ..... . ..... . ..... . ..... . 4-44

Figure 4-21: Sample of electrical module hardware removal ............................................. 4-46

Figure 4-22: 80A00 and 82A00 series parts removal (80A01 shown) ................................... 4-49

Figure 4-23: Location of debug pins ...... ................................ .................................. . 4-54

Figure 5-1: External parts ............ ................................ .................................. ......... 5-5

Figure 5-2: Drives... ................................ ................................ ............................. 5-7

Figure 5-3: Front panel and processors ........................................................................ 5-9

Figure 5-4: ATX assembly ......... ................................ ................................ ........... 5-11

Figure 5-5: Power supply...................................................................................... 5-13

Figure 5-6: Acquisition system ... . . . .... . ..... . ..... . ..... . ..... . ..... ..... . ..... . ..... . ..... . ..... . ... . . . ... 5-15

Figure 5-7: Time base delay cables........................................................................... 5-16

Figure 5-8: Electrical front end cables....................................................................... 5-17

Figure 5-9: Optical front end cables............................. .................................. ........... 5-18

Figure 5-10: 80E01, 80E02, 80E03, and 80E04 modules................................... ............... 5-20

Figure 5-11: 80E05 module (Option 10G shown) .......................................................... 5-21

Figure 5-12: 80E06 module ................ .................................. ................................ . 5-22

Figure 5-13: 80E07, 80E08, 80E09, and 80E10 modules................................... ............... 5-23

Figure 5-14: Optical modules................................................................................. 5-24

Figure 5-15: 80A01 module................................................................................... 5-25

DSA8300 Digital Serial Analyzer and Modules Service Manual iii

Table of Contents

Figure 5-16: 82

Figure 5-17: 80A06 module................................................................................... 5-28

A04 module................................................................................... 5-26

iv DSA8300 Digital Serial Analyzer and Modules Service Manual

List of Tables

Table 4-1: Required equipment for Removal and Replacement............................................. 4-5

Table 4 -2: P

Table 4-3: BIOS beep codes................................................................................... 4-57

Table 4-4: Action required for assembly replaced ............................... ........................... 4-58

Table 5-1: Mainframe cable connections ...................................................................... 5-3

Table 5-2: External replaceable parts ......... ................................ ................................. 5-4

Table 5-3: Drives replaceable parts...................... ................................ ....................... 5-6

Table 5 -4

Table 5-5: ATX assembly replaceable parts list............................................................. 5-10

Table 5-6: Power supply replaceable parts list ....................... .................................. ..... 5-12

Table 5-7: Acquisition system replaceable parts list..... . ..... . ... . . ..... . ..... . .... . ..... . ..... . ... . . ..... 5-14

Table 5-8: Time Base delay cables replaceable parts list ................... ............................... 5-16

Table 5-9: Electrical Front End cables replaceable parts list ......... ................................ ..... 5-17

Table

Table 5-11: 80E01, 80E02, 80E03, and 80E04 modules replaceable parts list ................... ....... 5-19

Table 5-12: 80E05 module replaceable parts list ........................................................... 5-21

Table 5-13: 80E06 module replaceable parts list ........................................................... 5-22

Table 5-14: 80E07, 80E08, 80E09, and 80E10 modules replaceable parts list .......................... 5-23

Table 5-15: Optical modules replaceable parts list ......................................................... 5-24

ble 5-16: 80A01 module replaceable parts list ........................................................... 5-25

Table 5-17: 80A04 module replaceable parts list ........................................................... 5-26

Table 5-18: 80A06 module parts list ......................................................................... 5-27

ossible causes of instrument failure............................................................ 4-50

: Front panel and processors replaceable parts list................................................. 5-8

5-10: Optical Front End cables replaceable parts list ............................................... 5-18

Table of Contents

DSA8300 Digital Serial Analyzer and Modules Service Manual v

General Safety Summary

General Safet

To Avoid Fire or Personal

Injury

ySummary

Review the fo this product or any products connected to it.

To avoid pot

Only qualiﬁed personnel should perform service procedures.

While using this product, you may need to access other parts of a larger system. Read the safety sections of the other component manuals for warnings and cautions r

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 grounded through the grounding conductor of the power cord. To avoid electric shock, the grounding conductor must be connected to earth ground. Before making connections to the input or output terminals of the product, ensure that the product is properly grounded.

llowing safety precautions to avoid injury and prevent damage to

ential hazards, use this product only as speciﬁed.

elated to operating the system.

Observe all terminal ratings. To avoid ﬁre or shock hazard, observe all ratings and markings on the product. Consult the product manual for further ratings information before making connections to the product.

The inputs are not rated for connection to mains or Category II, III, or IV circuits.

Do not apply a potential to any terminal, including the common terminal, that exceeds the maximum rating o f that terminal.

Power disconnect. The power switch disconnects the product from the power source. See instructions for the location. Do not block the power switch; it must remain accessible to the user at all times.

Do not operate without covers. Do not operate this product with covers or panels removed.

Do not operate with suspected failures. If you suspect that there is damage to this product, have it inspected by qualiﬁed service personnel.

Avoid exposed circuitry. Do not touch exposed connections and components when power is present.

Use proper fuse. Use only the fuse type and rating speciﬁed for this product.

Wear eye protection. Wear eye protection if exposure to high-intensity rays or

laser radiation exists.

vi DSA8300 Digital Serial Analyzer and Modules Service Manual

General Safety Summary

TermsinThisManual

Symbols and Terms on the

Product

Do not operate i

Do not operate in an explosive atmosphere.

Keep product surfaces clean and dry.

Provide prop

on installing the product so it has proper ventilation.

These terms may appear in this manual:

WAR NI NG .

in injury or loss of life.

CAUTION

damage to this product or other property.

These t

erms may appear on the product:

DANGER indicates an injury hazard immediately accessible as you read the ma

n wet/damp conditions.

er ventilation. Refer to the manual's installation instructions for details

Warning statements identify conditions or practices that could result

. Caution statements identify conditions or practices that could result in

rking.

WARNING indicates an injury hazard not immediately accessible as you

the marking.

read

CAUTION indicates a hazard to property including the product.

The following symbol(s) may appear on the product:

DSA8300 Digital Serial Analyzer and Modules Service Manual vii

Service Safety Summary

Service Safet

y Summary

Only qualiﬁe 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, switch off the instrument power, then disconnect the power cord from the mains power.

Use Care When Servicing With Power On. Dangerous voltages or currents may exist in disconnect test leads before removing protective panels, soldering, or replacing components.

To avoid electric shock, do not touch exposed connections.

d personnel should perform service procedures. Read this Service

this product. Disconnect power, remove battery (if applicable), and

viii DSA8300 Digital Serial Analyzer and Modules Se rvice Manual

Preface

This is the service manual for the DSA8300 Digital Serial Analyzer and the modules that install in the instrument (except for the 80A03 module).

Manual Structure

Manua

l Conventions

NOTE. The 80

servicing information.

Read this p andwhereyoucanﬁnd other information related to servicing this product. Read the Introduction following this preface for safety and other important background information needed before servicing this product.

This manual is divided into sections, whic h 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.

This manual uses certain conventions that you should become familiar with before beginning service.

A03 instruction manual contains its own speciﬁcations and

reface to learn how this manual is structured, what conventions it uses,

emblies and Modules

Ass

Replaceable Parts

Safety

DSA8300 Digital Serial Analyzer and Modules Service Manual ix

Throughout this manual, the term assembly appears. An assembly is composed of electrical and mechanical assemblies, circuit c ards, interconnecting cables, and a user-accessible front panel. References to an assembly are different

an references to a module such as “Sampling modules,” “Phase Reference

th modules,” or “Accessory modules,” which are products installed in the instrument compartments.

This manual refers to any ﬁeld-replaceable assembly or mechanical part by its name or generically as a replaceable part. In general, a replaceable part is any circuit board or assembly, such as a hard disk drive, or a mechanical part, such as I/O port connectors, that is listed in the replaceable parts list.

Symbols and terms related to safety appear in the General Safety Summary and the Service Safety Summary found at the beginning of this manual.

Preface

Related Documentation

The following documents relate to the instruments this service manual supports:

DSA8300 Quick Start User manual. Tektronix part number 071-2897-XX. This document also contains speciﬁcation changes when using the 82A04 Phase Reference module.

DSA8300 Speciﬁ cations and Performance Veriﬁcation manual. Tektronix part number 077-0571-XX.

DSA8300 Online Help. An online document accessed from the instrument Help menu.

DSA8300 Programmer Guide. An online document accessed from the instrument Help menu.

80E01, 80E02, 80E03, 80E04, and 80E06 Electrical Sampling Modules User manual. Tektronix part number 071-0434-XX.

80E07, 80E08, 80E09, and 80E10 Electrical Sampling Remote Modules User manual. Tektronix part number 071-2038-XX.

80C00 Series Optical Sampling Modules User manual. Tektronix part number

071-0435-XX.

80A01 Trigger Prescale Limiting Preampliﬁer Module User manual.

Tektronix part number 071-0873-XX.

80A02 EOS/ESD Protection Module Instructions. Tektronix part number 071-1317-XX.

80A03 TekConnect Probe Interface Module Instructions. Tektronix part number 071-1298-XX.

80A05 Electrical Clock Recove ry Module User manual. Tektronix part number 071-1467-XX.

82A04 Phase Reference Module User manual. Tektronix part number 077-0345-XX.

Rackmount Kit Instructions. Te ktronix part number 071-0696-XX.

TDR Z-Meas Application Online Help. Ships with this product on a separate

disc. Provides information about this TDR Impedance Measuring application that implements the TDR calibration procedures speciﬁed by the IPC TM-650 test method.

Fast NRZ Application Online Help. Ships with this product on a separate disc. Provides information about this application that improves throughput for optical eye-pattern mask testing.

x DSA8300 Digital Serial Analyzer and Modules Service Manual

Operating Information

CAUTION. Keep the bottom of the instrument clear of obstructions to allow proper

cooling.

Windows Safe Mode

If the instrument is turned off before the operating system boots, or if you’ve installed a third-party product with a driver that is not compatible with the instrument start-up, Windows will open in Safe mode. The touch screen will not operate; you must install the standard-accessory keyboard and mouse. Information about ins Tektronix part number 071-2897-00.

talling these accessories is in the DSA8300 Quick Start User Manual,

When you

have removed any barrier to Windows start-up, you can reboot. If the instrument no longer boots to Safe mode, you can remove the keyboard and mouse if desired.

WheretoFindUserInformation

CAUTION. Be sure to read all safety information, warnings, and cautions in the

manuals that relate to the information you use there.

user

Some topics of interest when servicing the product are listed in the following

le. The manuals are available at www.tektronix.com/manuals.

tab

Location of user topics

Manual Topic

DSA8300 Quick Start User Manual, Tektronix part number 071-2897-00

Your sample-module user manual. (Module manual part numbers are provided in the preface o f this manual.)

Environmental requirements (site considerations, operating requirements,

ckmount requirements)

aximum conﬁguration

onnecting peripherals such as monitor,

C printer, keyboard, and mouse

Powering the instrument on and off

System hard drive rebuild

Diagram of rear-panel connectors

Installing sampling modules

Installing probes and other accessories to the sampling modules

DSA8300 Digital Serial Analyzer and Modules Service Manual 1–1

Operating Information

Location of user topics

Manual Topic

DSA8300 Speci Veriﬁcation manual, Tektronix part number

077-0571-00

Product software install instructions, Tektronix p with the product software disc.

ﬁcations and Performance

art number 071-2050-02. Shipped

System diagno

System hard drive rebuild procedure

Software r elease notes

Software installation

Operating system reinstallation

stics procedure

1–2 DSA8300 Digital Serial Analyzer and Modules Service Manual

Theory of Operation

This chapter describes the electrical operation of the instrument and sampling modules.

The instrument contains many digital logic circuits. This manual refers to these circuits with standard logic s ymbols and terms. Unless otherwise stated, all logic functions a the two logic levels is the high (1) state, and the more negative level is the low (0) state. Signal states may also be described as "true", meaning their active state, or "false", meaning their nonactive state. The speciﬁc voltages that constitute a high or low state vary among the electronic devices.

The instrument control system is a dual Wintel/PowerPC based processor board. The platform features XGA resolution ﬂat-panel display, transparent touch screen and user front-panel with direct access to commonly used oscilloscope functions. The inst advanced functions.

re described using the positive-logic convention: the more positive of

rument is also equipped with a mous e and keyboard for access to more

DSA8300 Digital Serial Analyzer and Modules Service Manual 2–1

Theory of Operation

Mainframe Ove

rview

This mainframe overview describes the basic operation o f each functional circuit block as shown in the following ﬁgure:

Figure 2-1: DSA8300 block diagram

2–2 DSA8300 Digital Serial Analyzer and Modules Service Manual

Theory of Operation

Input Signal Path

Asignalenters connector on a sampling module, or a real time probe connected to the sampling module channel.

Acquisition system. The acquisition system conditions the input signals, samples them, converts them to digital signals, and controls the acquisition process under direction of the processor system.

The acquisition system includes the multi-source trigger, acquisition time base, and acquisition mode generation and control circuitry. The acquisition boards are located in the bottom compartment of the instrument and can accommodate four small slot sampling plug-ins, two large slot plug-ins and a trigger/holdoff subsystem. Up to eight vertical channels are accommodated simultaneously. Channels 1, 2, 3, and 4 can be either large or small slots. The presence of an assembly in one or both large slots displaces the small slot functionality in the corresponding small slots. The external trigger and all small slot channels feature a Tekprobe Level 2 probe power connector for a dditional front end signal conditioning functions like high input-impedance real-time probes, if equipped on the sampling module.

Processor system. The processor system contains a dual Wintel/PowerPC

The basic instrument conﬁguration supports up to eight channels labeled Ch 1 through Ch 8, provides two external trigger inputs for direct and prescaled/clock triggering through built-in prescaler and is able to support four optional internal trigger sources associated with the large slot channels.

the instrument through a direct coaxial connection to the input

Display Panel

Front Panel

Color LCD display Active-matrix touch panel.

Display system. The display system sends the text and waveform information to the display panel

Touch panel. The touch panel sends information to the processor. Any changes in their settings are reported to the processor system.

The front panel board reads the front-panel switches and knob sensors. Any changes in their settings are reported to the Windows system. The front panel board also turns the LEDs on. One USB port is also accessible from the front panel.

Front-panel menu switches are also read by the front-panel microcontroller. The microcontroller sends any changes in menu selections to the Windows system. The ON/STBY switch is one of the menu switches. However, it is not read by the front panel board, but passes through the front panel board to the Wintel motherboard.

The CD-RW/DVD drive enables you to load software to customize your instrument for your measurement needs and to save data to a writable CD.

DSA8300 Digital Serial Analyzer and Modules Service Manual 2–3

Theory of Operation

Rear Panel

Low Voltage Power Supply

Fans

The removable h

ard drive contains the product software and operating system software. It also provides capability to store and access waveform data. The GPIB allows for external control of the instrument.

You can make hard copies on the GPIB and RS-232 ports. Other ports are outputs from the ATX board: DVI-I, USB (4), sound, serial, Ethernet, mouse, and keyboard.

The low voltage power supply is a switching power converter with active power factor control. It supplies power to all of the circuitry in the instrument.

The principal POWER switch, located on the rear panel, controls all power to the instrument including the Low Voltage Power Supply. The ON/STBY switch, located on the front panel, also controls all of the power to the instrument except for part of the circuitry in the Low Voltage Power Supply and stand-by power on the motherboard.

The power supply sends a power fail (~PF) warning to the proces sor system if the power is going down.

The fan assembly provides forced air cooling for the instrument.

The fans are controlled by the PPC processor.

Electrical Sampling Modules

80E01, 80E02, 80E03,

80E06, 80E07, and 80E09

Sampling Modules

The electrical sampling m odules (non-TDR capable) are one- and two-channel sampling modules. Their basic features are listed in the following table. (The TDR capable sampling modules are describe later.)

Electrical sampling module features

ature

Number

o independent channels

Bandwidth

Selectable bandwidths

Signal connectors

Remote sampler

E01

122122

50 GHz 12.5 GHz 20 GHz 70 GHz 30 GHz 60 GHz

N.A. N.A. N.A. N.A.

2.4 mm female

N.A. N.A. N.A. N.A. 2 meter

E02

3.5 mm female

E03

3.5 mm female

E06

1.85 mm (V) female

E07

20 GHz, 30 GHz

2.92 mm (K) female

cable

E09

40 GHz, 30 GHz, 60 GHz

1.85 mm (V) female

2 meter cable

2–4 DSA8300 Digital Serial Analyzer and Modules Service Manual

Theory of Operation

80E04, 80E08, and 80E10

TDR/Sampling Modules

For the two-cha

nnel modules, a single strobe delivered from the instrument mainframe to both acquisition channels controls the timing of the strobe assertion to both channels. If channel-to-channel deskew is zero and the channel delays (if equipped) are matched, the sampling coincidence between channels is very close. Acquisition deskew function is carried out either by making separate acquisitions over individual acquisition windows or by adjusting Channel Delay (if equipped).

For the one-channel modules, an individual strobe delivered from the instrument mainframe to the acquisition channel controls the timing of the strobe assertion to the chan

nel. Acquisition deskew function is carried out by moving the strobe timing for the channel to a unique acquisition window or by adjusting Channel Delay (if equipped).

Most electrical channels feature a Tekprobe Level 2 probe power connector for attachment of a real time probe. The control of this probe is a mainframe function.

All module calibration signals are derived from a 2.5 V precision voltage reference internal to the sampling module. Settings derived from this reference are stored in a nonvolatile EEPROM in the sampling module, although the responsibility for the execution of these settings is with the mainframe.

The TDR/Sampling modules are low noise samplers, with each channel capable of generating its own Time Domain Reﬂectometry (TDR) step. The basic features of these modules are listed in the following table.

TDR sampling module features

ture

Fea

ber of

Num independent channels

Number of TDR

annels

Bandwidth

Selectable bandwidths

Signal connectors 3.5 mm female 2.92 mm (K) female 1.85 mm (V) female

Remote sampler N.A. 2 meter cable 2 meter cable

80E

222

0GHz

N.A.

80E

0GHz

20 GHz, 30 G Hz 40 GHz, 30 GHz,

80E

0GHz

50 GHz

For these modules, a single strobe d elivered from the instrument mainframe to both acquisition channels controls the timing of the strobe assertion to both channels. If channel-to-channel deskew is zero and the channel delays (if equipped) are matched, the sampling coincidence between channels is very close. Acquisition deskew function is carried out by making separate acquisitions over acquisition windows or by adjusting Channel Delay (if equipped).

Each electrical channel features a Tekprobe Level 2 probe power connector for attachment of a real time probe. The control of this probe is a mainframe function.

DSA8300 Digital Serial Analyzer and Modules Service Manual 2–5

Theory of Operation

All module cali internal to the sampling module. Settings derived from this reference are stored in a nonvolatile EEPROM in the sampling module, although the responsibility for the execution of these settings is with the mainframe.

When used in the acquisition mode (that is, with the TDR step generator turned off) each channel functions as a normal sampling input. In the TDR mode, a fast rise time step is generated internally for each channel and applied to the input signal path for that channel. The acquisition part of the TDR/sampling module remains functional for monitoring the primary step and its reﬂected components. The sampling module provides two self-contained TDR channels. The polarity of the output step can be selected independently for each channel. This allows differential or common mode testing of two coupled lines as well as independent testing of isolated lines.

Optical Sampling Modules

80CXX and 80CXX-CR optical modules share the same mechanical package and are built with a common circuit board. D ifferent functionality within the m odules (current and future modules) is achieved by installing different O/E modules, ﬁlters and clock recovery boards along with setting the sampler bandwidth as demanded. The key features supported in the module are:

bration signals are derived from a 2.5 V precision voltage reference

A one channel, low noise, adjustable bandwidth sampler allowing multiple bandwidth settings for optimizing noise versus bandwidth demands.

An ampliﬁed or nonampliﬁed O/E converter.

Support for internal RF switches in the signal path with a straight-through path and three hardware-ﬁltered reference receiver paths between the O/E converter and the sampler.

An average optical power meter.

Integral clock recovery option with internal coaxial connection to the mainframe trigge

Communication with the mainframe for identiﬁcation, control and calibration/compensation storage.

The "system response" depends on all of the c omponents in the signal path from the front panel to the sampler. Bandwidth and reference receiver responses are calibrated at the factory with a sub-picosecond optical impulse applied to the front panel connector or with an optical heterodyne system. This ensures that all components are included, but also means that components cannot be replaced without performing calibration.

Compensation performs a DC transfer curve characterization for each bandwidth/reference receiver setting. The curve data is stored in the module EEPROM and used to generate a look-up table in the mainframe. This data corrects for linearity, gain and offset errors in the sampler.

r, front panel clock and data output (not all have data).

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Theory of Operation

Reference rece

ivers can be created in any of the following ways:

Ahardwareﬁlter inserted between the O/E and the sampler and dominates the res ponse.

No ﬁlter is used, but the bandwidth of the sampler is adjusted.

The O/E bandwidth is adjusted and dominates the response.

Information about the available bandwidth and reference receiver selections, and the method used to set the bandwidth for the optical modules is in the Optical Sampling Module section. (See page 2-8.)

The power monitor is a second measure of the photo-diode current that is independent of the sampler signal path. Analog circuitry continuously senses the current ﬂowing into the bias side of the photo diode. The signal is ampliﬁed by a programmable gain ampliﬁer and input to an 8-bit AD converter. The AD

converter and ampliﬁer are controlled through the I

C interface. Compensation performs two functions in the power meter: First, two offset inputs are adjusted in the ampliﬁer so that the signal stays in range for all of the gain settings. Next, offset is measured for all gain s ettings and stored so it can be subtracted from the raw measured current. Because the m easurements are made through independent paths the power monitor is useful in debugging module/mainframe problems.

The main board of the module only provides power and control bits to the clock recovery board. A small fraction of the input signal is split off and applied to the clock recovery components. The type of splitter for each module is shown in the foll

owing table.

Module optical/electrical split

Module Optical Split Electrical Split

C01

C02

C03

C04

C07

C07B

C08

C08B

C08C

C09

C11

C12

The recovered clock is routed in coaxial cable through the rear connector of the module to the Optical Front End board in the mainframe. The Optical Front End board has a switch that selects which modules clock is applied to the trigger. The control signal for that switch comes from the optical module.

DSA8300 Digital Serial Analyzer and Modules Service Manual 2–7

Theory of Operation

80C01 Optical Sampling

Module

The 80C01 modul (1100-1650 nm) signals at 622, 2488, and 9953 Mb/s a s well as general purpose testing up to 20 GHz optical bandwidth. Bandwidth and reference receiver calibration is performed with a sub-picosecond optical impulse and a Fourier transform method.

OC12: The electrical sampler is adjusted to approximately 7.5 GHz (-3 dB) bandwidth and signal is routed through a hardware ﬁlter designed to result in the combined system having an OC12 (STM-4) Reference Receiver response.

OC48: The electrical sampler is adjusted to 7.5 GHz (-3 dB) bandwidth and signal is routed through a hardware ﬁlter designed to result in the combined system having an OC48 (STM-16) Reference Receiver response. These adjustmentsmustbemadeatthefactory.

OC192: The electric al sampler is adjusted to give the desired response, and s ignal is not routed through any ﬁlter (signal is sent through the straight-through path). The sampler bandwidth and response is optimized during the calibration such that the combined system will have an OC192 (STM-64) Reference Receiver response.

12.5 GHz: The sampler bandwidth and response is set during the calibration such that the combined system will have an Optical Bandwidth (-6 dB) >12.5 GHz.

20 GHz: The sampler bandwidth and response is set during the calibration such that the combined system will have an Optical Bandwidth (-6 dB) >20 GHz.

e supports conformance testing of long wavelength

80C02 Optical Sampling

Module

The 80C02 module is optimized for testing of long-wavelength (1100-1650 nm) signals at (9.953 Gb/s) SONET OC-192 / SDH STM-64 standards. With its high optical bandwidth (>30 GHz) it is also well suited to general purpose high-performance optical component testing.

12.5 GHz: The sampler bandwidth and response is set during the calibration such that the combined system will have an Optical Bandwidth (-6 dB) >12.5 GHz.

20 GHz: The sampler bandwidth and response is set during the calibration such that the combined system will have an Optical Bandwidth (-6 dB) >20 GHz.

30 GHz: The sampler bandwidth and response is set during the calibration such that the combined system will have an Optical Bandwidth (-6 dB) >30 GHz.

2–8 DSA8300 Digital Serial Analyzer and Modules Service Manual

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Tektronix DSA8300 Digital Serial Analyzer,Modules Service

Specifications and Main Features

Frequently Asked Questions

User Manual