DSA8300
xx
ZZZ
Digital Serial Analyzer and Modules
Service Manual
*P077057200*
077-0572-00
xx
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
Ta
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
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)
ra
aximum configuration
M
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
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
Fe
Number
f
o
independent
channels
Bandwidth
Selectable
bandwidths
Signal
connectors
Remote
sampler
E01
80
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
80
3.5 mm
female
E03
80
3.5 mm
female
E06
80
1.85 mm
(V)
female
E07
80
20 GHz,
30 GHz
2.92 mm
(K)
female
cable
E09
80
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
ch
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
04
80E
222
222
0GHz
2
N.A.
08
80E
0GHz
3
20 GHz, 30 G Hz 40 GHz, 30 GHz,
10
80E
0GHz
5
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).
2–6 DSA8300 Digital Serial Analyzer and Modules Service Manual
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
2
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
n
n
n
n
n
n
n
n
n
n
n
n
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.
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.
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
Loading...