Tektronix WFM700 Service Manual

Service Manual

WFM700 Series Waveform Monitors

071-0915-04

This document applies to firmware version 1.3.0 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

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

Tektronix, Inc., P.O. Box 500, Beaverton, OR 97077

TEKTRONIX and TEK are registered trademarks of Tektronix, Inc.

Warranty 2

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 new or reconditioned to like new performance. All replaced parts, modules and products become the property of Tektronix.

In order to obtain service under this warranty, Customer 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 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 re turned 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 c onnection to incompatible equipment; c) to repair any damage or malfunc tion caused by the use of non-Tektronix supplies; or d) to service a product that ha s 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 WITH RESPECT TO THE PRODUCT IN LIEU OF ANY OTHER WARRANTIES, EXPRESS OR IMPLIED. TEKTRONIX AND ITS VENDORS DISCLAIM ANY IMPLIED WARRANTIES OF MERCHANT ABILITY 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 WARRANTY. TEKTRONIX AND ITS VENDORS WILL NOT BE LIABLE FOR ANY INDIRECT, SPECIAL, INCIDENT AL, OR CONSEQUENTIAL DAMAGES IRRESPECTIVE OF WHETHER TEKTRONIX OR THE VENDOR HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES.

General Safety Summary vii...................................

Service Safety Summary ix....................................

Preface xi...................................................

Manual Content xi.................................................

Manual Conventions xi..............................................

Related User Documents xii..........................................

Related Reference Documents xiii......................................

Contacting Tektronix xiv.............................................

Theory of Operation

Operating Conditions 1--1.............................................

Overview 1--1.......................................................

Individual Module Descriptions 1--2.....................................

Diagrams 1--7.......................................................

Performance Verification

Prerequisites 2--1....................................................

Test Equipment Required 2--2..........................................

Performance Verification Conditions 2--4.................................

Self Tests 2--4.......................................................

Functional Tests 2--6.................................................

Performance Tests 2--9................................................

WFM700 Audio (Option DG) Performance Verification Procedure 2--50.........

WFM700/WFM7M Input Module Test Record 2--57.................

WFM700/WFM7A Input Module Test Record 2--63..................

WFM700/WFM7HD Input Module Test Record 2--67................

WFM700 Audio Module (Option DG) Test Record 2--71..............

Adjustment Procedures

Adjustments 3--1..............................................

Manual Adjustment Procedures 3--3.....................................

Instrument Driven Procedures 3--11......................................

WFM700 Series Waveform Monitors S ervice Manual

Table of Contents

Maintenance

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

Firmware Upgrades 4--1..............................................

Preventing ESD 4--2.................................................

Inspection and Cleaning 4--3...........................................

Removal and Installation Procedures 4--7.........................

Cabinet 4--8........................................................

Chassis Cover 4--9...................................................

Plug-In Modules 4--11.................................................

Power Supply 4--18...................................................

Front End Assembly 4--19..............................................

Fans 4--22...........................................................

Fan Assembly 4--23...................................................

Main Circuit Board 4--25...............................................

Troubleshooting 4--27...........................................

Check for Problems 4--27..............................................

Diagnostics 4--30.....................................................

LED Fault Codes 4--32................................................

Troubleshooting Trees 4--33............................................

Repackaging Instructions 4--41...................................

Replaceable Parts

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

Parts Ordering Information 5--1.........................................

Module Servicing 5--2................................................

Using the Replaceable Parts List 5--2....................................

WFM700 Series Waveform Monitors S ervice Manual

List of Figures

Table of Contents

Figure 1--1: WFM700 signal flow block diagram 1--8................

Figure 1--2: Control flow block diagram 1--9.......................

Figure 2--1: Signal data paths performance verification screen one 2--12.

Figure 2--2: Signal data p ath s performance verification screen two 2--12.

Figure 2--3: Serial video output level performance verification

screen 2--17................................................

Figure 2--4: SD PIX MON output level performance screen 2--18.......

Figure 2--5: HD pix G/Y video output level performance screen 2--20...

Figure 2--6: HD pix B/Pb and R/Pr video output level performance

screen 2--21................................................

Figure 2--7: SD pix video output level performance screen 2--22........

Figure 2--8: HD GBR frequency response performance screen 2--26.....

Figure 2--9: SD GBR frequency response performance screen 2--28.....

Figure 2--10: Eye vertical scale reference level screen 2--30............

Figure 2--11: Eye vertical scale performance screen 2--31..............

Figure2--12:Eyetimebasejitterperformancescreen 2--35............

Figure 2--13: Eye clock recovery bandwidth performance screen 2--37..

Figure 2--14: Eye clock recovery bandwidth performance screen 2--42..

Figure 2--15: Jitter gain check performance screen 2--45..............

Figure 2--16: Eye pattern display signal bandwidth performance

screen 2--47................................................

Figure 3--1: Adjustment locations on the video module 3--3...........

Figure 3--2: Serial out amplitude adjustment screen 3--5.............

Figure 3--3: SD PIX monitor adjustment screen 3--6.................

Figure 3--4: SD PIX G/Y output adjustment screen 3--8..............

Figure 3--5: SD PIX B/Pb and R/Pr output adjustment screen 3--8.....

Figure 3--6: HD PIX G/Y output adjustment screen 3--10.............

Figure 3--7: HD PIX B/Pb and PIX R/Pr output adjustment screen 3--10

Figure 3--8: Calibration routines menu 3--11........................

Figure 3--9: Eye vertical scale reference amplitude screen 3--13........

Figure 3--10: Eye vertical scale adjustment screen 3--14...............

Figure 3--11: SD Jitter gain adjustment screen 3--16..................

Figure 3--12: HD Jitter gain adjustment screen 3--18.................

WFM700 Series Waveform Monitors S ervice Manual

iii

Table of Contents

Figure 3--13: Eye loop BW one UI adjustment screen 3--18............

Figure 3--14: Jitter HPF adjustment screen 3--23....................

Figure 4--1: Cabinet attaching screws 4--8.........................

Figure 4--2: WFM700 chassis cover, showing screws to loosen

and remove 4--10............................................

Figure 4--3: Plug-in module retaining screws 4--11...................

Figure 4--4: Grounding clip between two video modules 4--12..........

Figure 4--5: Removing a plug-in module 4--13.......................

Figure 4--6: WFM700 rear panel showing slot numbers 4--15..........

Figure 4--7: Inserting a module into the chassis 4-- 16.................

Figure 4--8: Installing the grounding clip between two video

modules 4--17...............................................

Figure 4--9: Front panel assembly 4--20............................

Figure 4--10: Keyboard access 4--21...............................

Figure 4--11: Fan assembly mounting 4--24.........................

Figure 4--12: Main circuit board securing screws 4--25................

Figure 4--13: Primary troubleshooting procedure 4--34...............

Figure 4--14: LED fault troubleshooting tree 1 4--35..................

Figure 4--15: LED fault troubleshooting tree 2 4--36..................

Figure 4--16: Blank screen troubleshooting tree 4--37.................

Figure 4--17: Front panel buttons and touch panel troubleshooting

tree 4--38..................................................

Figure 4--18: Diagnostics errors troubleshooting tree 4--39............

Figure 4--19: Audio (Option DG) diagnostics errors troubleshooting

tree 4--40..................................................

Figure 5--1: WFM700 replaceable circuit boards and cables 5--8......

Figure 5--2: WFM700 power supply assembly and rear panel

(B010999 and below) 5--10....................................

Figure 5--3: WFM700 replaceable chassis parts 5--13.................

Figure 5--4: WFM700 Audio board option DG 5--15..................

WFM700 Series Waveform Monitors S ervice Manual

List of Tables

Table of Contents

Table 2--1: T est equipment for performance verification 2--2.........

Table 3--1: Test equipment for adjustment procedures 3--2...........

Table 4--1: External inspection check list 4--4......................

Table 4--2: Internal inspection check list 4--5......................

Table 4--3: Tools required for module removal 4--7.................

Table 4--4: Failure symptoms and possible causes 4--27...............

Table 4--5: LED fault codes 4--32.................................

WFM700 Series Waveform Monitors S ervice Manual

Table of Contents

WFM700 Series Waveform Monitors S ervice 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.

To Avoid Fire or

Personal Injury

Use Proper Power Cord. Use only the power cord specified for this product and

certified for the country of use.

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.

Observe All Terminal Ratings. T o avoid fire or shock hazard, observe all ratings and markings on the product. Consult the product manual for further ratings information before making connections to the product.

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

Replace Batteries Properly. Replace batteries only with the proper type and rating specified.

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.

WFM700 Series Waveform Monitors S ervice Manual

vii

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:

CAUTION

Refer to Manual

WARNING

High Voltage

Protective Ground

(Earth) Terminal

viii

WFM700 Series Waveform Monitors S ervice 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, 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 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.

WFM700 Series Waveform Monitors S ervice Manual

Service Safety Summary

WFM700 Series Waveform Monitors S ervice Manual

Preface

Manual Content

Manual Conventions

This is the service manual for the WFM700HD, WFM700A, and WFM700M multi-format, multi-standard waveform monitors.

Read this preface to learn how this manual is structured, what conventions it uses, and where you can find other i nformation related to servicing this product.

This manual contains only information related to servicing the WFM700 instrument. For information related to installing and operating the instrument or for a list of instrument specifications, refer to the appropriate user document as described in Related User Documents on the following page.

Be sure to read the introductions to all procedures. These introductions provide important information needed to do the service correctly, safely, and efficiently.

Module

Plug-in Module

Replaceable Parts

Safety

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

The term module refers to a collection of items that are replaceable as a unit. A module may contain electrical and mechanical assemblies, circuit boards, and interconnecting cables.

The term Plug-in Module refers to the units that plug into the Main board.

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 that is listed in t he Replaceable Parts section.

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

Be sure to read both the General Safety Summary and Service Safety Summary before performing any service to this instrument.

WFM700 Series Waveform Monitors S ervice Manual

Preface

Contacting Tektronix

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 www.tektronix.com/support

1-800-833-9200, select option 3*

6:00 a.m. -- 5:00 p.m. Pacific Standard 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.

xiv

WFM700 Series Waveform Monitors S ervice Manual

Theory of Operation

This chapter contains a module-level description of the WFM700 instrument. Two block diagrams are provided to aid the descriptions. Figure 1--1 on page 1--8 shows the signal flow of the instrument and Figure 1-- 2 on page 1 --9 shows the control flow.

Operating Conditions

The electrical specifications of the instrument are listed in the WFM700 Series Technical Reference document and apply over an ambient temperature range of

+0 _Cto+40_C. The rated accuracies are valid when the instrument is calibrated in an ambient temperature range of +20 _Cto+30_C.

Overview

The WFM700 accepts either SD (Standard Definition) or HD (High Definition) serial video data at the input connectors of an installed Input Module (in either slots 1 or 2 of the WFM700 mainframe). The applied video signal i s sent to SD and HD equalizers (to compensate for signal degradation due to cable loss) and to the eye sampler. The compensated serial video signal is converted to parallel video and a clock signal is recovered. The parallel signal is further processed to extract the embedded audio signal, detect the video format, and generate an RGB Analog video signal. The embedded audio is encoded into AES signals that are sent to the optional Audio module by way of the audio bus.

The parallel video signal is sent to the Real-time Display module on a digital bus, 10 bits for SD video and 20 bits for HD video. The RGB video is sent to the Reference module on the analog bus for component video output at the P IX G/Y, PIX B/Pb, and PIX R/Pr connectors and the VGA PIX MON connector.

The Real-Time Display module accepts the parallel video signal from the selected Input Module. The video signal is processed to display the information in various forms on the raster display. The output from the Real-Time Display module is sent to the Main Interface board via LVDS pairs. There the video signal is added with text and graticule information from the VGA controller. The combined video signal is sent to the LCD and the EXT VGA output connector.

Timing is accomplished by using the clock and TRS (timing reference signal) from the video input signal. A clock and and TRS (from an analog video signal) can be input via the External Reference module using the AUX IN connector.

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1- 1

Theory of Operation

Communication between modules and the CPU is accomplished via the Main Interface board using two main control busses (PCI and Serial) and two RS232 connections. The Input Modules and Real-Time Display module use the PCI bus. The Reference Module uses the Serial bus. The Front Panel uses RS232 to communicate with the CPU which interprets the information and sends the commands to the appropriate modules. The CPU also communicates with the Environmental Controller (on the Main Interface board) via an RS232 connection.

Power for the WFM700 is provided by the power supply module. The power supply module accepts line input voltages within the range of 100 VAC to 240 VAC. Anytime line input voltage is supplied to the power supply module, a +5 V housekeeping supply is activated, providing power to the front panel ON/STBY switch and to the Environmental Controller (EC) on the Main Interface board. Pressing the ON/STBY button activates the main power supply (within the Power Supply module), providing power to the entire instrument and modules.

Once the power supply stabilizes, the CPU module polls all slots (via the PCI bus and Serial Control bus) to determine the installed modules.

Individual Module Descriptions

The following descriptions provide more detail about the individual functions of each instrument board or module.

Front Panel Processor

LCD and Backlight

The Front Panel Processor board sends all front panel actions (including the touch screen) to the CP U board via the RS232 Bus.

The LCD panel displays the video output from the Main Interface board via the VGA Mux. The Backlight board supplies the high voltage necessary to drive the backlight for the LCD panel.

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WFM700 Series Waveform Monitors S ervice Manual

Theory of Operation

Input Module

The Input module is comprised of two circuit boards, a Mezzanine board and an Input board.

The Mezzanine board provides two terminating serial inputs, each supporting either SD (SMPTE 259M) or HD (SMPTE 292M) SDI signals. A mux selects between the two inputs and sends the signal to an eye pattern sampler block and a serial receiver block (equalizing the signal). The eye pattern sampler block implements a 3 GHz equivalent-time sampler to allow viewing the input eye pattern. The equalized SD or HD signal and the eye pattern data samples are sent to the Input board.

On the Input board, an SD or HD serial-to-parallel block provides clock recovery and serial-to-parallel conversion of the selected input. An FPGA block multiplexes between the eye sampler output and serial receiver block output (depending on instrument mode), implements any needed waveform conditioning (such as ancillary data extraction), and outputs the parallel signal (20 bits for HD mode, 10 bits for SD mode) to the Real-Time Display (RTD) board. The FPGA block also extracts up to eight channels of audio signal which is put on the audio bus for future use.

A DAC block creates a picture monitor signal which is output through the VGA PIX MON connector and the component video connectors (PIX G/Y, PIX B/Pb, PIX R/Pr) on the Reference Module.

External Connectors

H INPUT A. Digital input for signal to be monitored. For WFM700HD, this

can only accept 1.485 Gb/s and 1.4835 Gb/s High Definition serial video. For the WFM700A and WFM700M, this input can accept HD and 270 Mb/s Standard Definition video. This is a 75 8 terminating input.

H INPUT B. Digital input for signal to be monitored. For WFM700HD, this

H SD PIX MON. This output is a copy of the PIX G/Y, B/Pb, R/Pr pix mon

output, but in reclocked SD serial digital format. It is operational only for SD input formats.

H SERIAL OUT. Provides an equalized and buffered version of the selected

signal input (Video Input A or B).

H JITTER OUT. (WFM700M only) Provides a 75 8 output signal from the

jitter demodulator. This signal is only valid when the instrument is in Jitter mode. Any signal present on this output at other times is not a calibrated jitter signal.

WFM700 Series Waveform Monitors S ervice Manual

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Theory of Operation

Reference Module

The External Reference module provides synchronization for the WFM700 instrument, allowing you to sync the display to an analog video input. The Reference Module accepts PAL and NTSC signals with bi-level sync (SD) or tri-level sync (HD) input, so that timing of the SDI input signals can be compared to the analog sync reference. The External Reference module automatically detects the input standard. The Reference Board timing signals are available to both the Input Module and Real-Time-Display Module.

The sync signal from the External Reference module is embedded in a data stream of 27 MHz (for SD video), and 74.25 MHz or 74.1758 MHz (for HD video). This data stream is called the TR S signal, and contains H, V, and F information. The External Reference module acts as a data hub or router for TRS (timing reference signal) signals to and from the input modules (slots 0 or 1) and the Real-Time Display module.

External Connectors

H REF IN LOOP-THROUGH. Compensated for 75 8 impedance; requires

proper termination at one end of the loop-through connector or at the receiver in a monitored system. Provides for connection of an external synchronization signal such as black burst or composite video.

H AUX IN. Future capability.

H VGA PIX MON. A copy of the PIX G/Y, B/Pb, R/Pr pix mon outputs. This

allows using an inexpensive VGA monitor for non-critical HD applications. Most computer monitors will not lock to 50 Hz vertical rates or to Standard Definition line rates, so this may not work in all applications.

H PIX G/Y, B /Pb, R/Pr. Provides three 75 8 component signal outputs to drive

a component picture monitor. You can set the output format to YPbPr or RGB.

H AUX OUT 1 / AUX OUT 2. Future capability.

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WFM700 Series Waveform Monitors S ervice Manual

Theory of Operation

Main Interface Board

The Main Interface board provides signal paths and communication paths between all modules.

H PCI Bus and Serial Control Bus are used for control and data transfer. Both

go to all slots. The PCI Bus is typically used for modules requiring high-speed performance and communication between modules without the use of the CPU board. The Serial Control Bus is used for modules requiring less control and speed.

H The Timing Bus is used to distribute the TRS signal to the Input Modules

and the RTD board.

H The Audio Bus routes the digital audio signal (extracted from the video

serial input) to the module slots for use by future modules.

H The Video Bus routes the parallel video signal (with clock and sync signals)

to the RTD slot from the two Input slots.

The Main Interface board provides power distribution, contains thermal sensors, and contains the Environmental Controller (EC). The EC monitors the front panel ON/STBY switch to control the main power supply (in the Power Supply module) and monitors all low voltage power sensors for inaccurate voltage levels.

The VGA Controller routes the video signal to both the LCD and the EXT VGA output. This output can be used to drive an external monitor to produce the same display as seen on the LCD.

External Connectors

H EXT VGA. Provides an exact copy of the LCD screen to drive an external

monitor.

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Theory of Operation

CPU Board

Real Time Display (RTD)

Board

The CPU board receives commands from the Front Panel (buttons, knobs, and touch screen) via RS232 connections, then transmits instructions to the other modules via the PCI bus and Serial bus. The CPU also defines the operation of the video channels (but is not in the video signal path). All text and graticule information for the LCD panel is generated by the CPU board and sent to the LCD via the VGA Mux on the Main Interface board.

External Connectors

H REMOTE. 9 pin subminiature D-type connector used as a Ground Closure

interface for remote control.

H USB. This connector is not used and was removed for CPU board versions

671-4528-04 (SN B019999 and below) and 671-5751-03 (SN B024089 and above).

H ETHERNET. (10/100 Base T). 10/100 Mbit/sec Ethernet interface. Used for

downloading firmware upgrades.

Real Time Display board receives the parallel digital video signal from the Input module and processes the video data to display the information in various forms on the raster display. The different forms of display consist of sweeps (overlay or parade), x y (vectors, lighting, diamond, ect.), and picture monitor. The RTD board handles either standard definition (SD) or high definition (HD) data. Only one channel is processed at a time.

The RTD is divided into two logical sections. The first section, the DSP engine, performs signal processing and routing operations to create standard waveform monitor displays. The second section, the rasterizer engine, performs attack and decay operations to simulate an analog CRT phosphor screen. The rasterizer also has the ability to partition multiple displays into separate windows.

The RTD accepts a 10 or 20-bit data stream (SD or HD) from either of two input slots. A polyphase interpolator increases the data rate and fills gaps in the data. The higher data rate allows the rasterizer to plot more pixels per second to improve the display quality. The Measurement Processing block produces various waveform displays such as Parade, Vector, and Diamond and also performs gain, offsetting, and filtering operations. It outputs pairs of numbers used by the Rasterizer and its companion memory to build a display map. Memory values are incremented or decremented depending on these number pairs, varying pixel display brightness according to frequency of occurrence, similar to a phosphor screen. A Picture Mode Processing block allows a raster picture display of the input signal, suitably adjusted to the 640x480 VGA display format. The Rasterizer output is applied to the color LCD display after it is combined with any text and graticules from the VGA controller.

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Theory of Operation

Audio Module (Option DG)

The Audio board receives serial audio data in AES/EBU format from the selected Input module, or from the AES I/O connectors if they are configured as inputs. When configured as outputs, the AES I/O connectors supply AES/EBU serial audio de-embedded from the selected video input. The selection of extracted embedded audio groups takes place within the Input module.

AES/EBU signals from the selected source are processed to extract channel status, validity, and parity bits. The audio data is examined for clip and mute conditions, and word length (active bits) and peak values are determined. Audio data is up-sampled to 192 kb/sec for further processing.

DSP processors compute audio level according to the configured level meter ballistic. The CPU periodically polls the Audio Module to get the current audio levels, and then draws the corresponding bars via the VGA controller. Other data concerning audio (clip, mute, channel status etc) is communicated in a similar fashion from the Audio Module to the CPU for display, data logging, or alarm activation.

A DSP processor creates a Lissajous image that is periodically transferred directly to the VGA controller via the PCI bus.

External Connectors

H AES 1-2 I/O / AES 3-4 I/O / AES 5-6 I/O / AES 7-8 I/O. Four AES/EBU

format, AES-3id compatible inputs or outputs. As outputs, they supply serial audio de-embedded from the selected video input. As inputs, they can be selected for complete processing and display in place of embedded audio.

Power Supply Module

Diagrams

The power supply module accepts line input voltages within the range of 100 VAC t o 240 VAC. Anytime line input voltage is supplied to the power supply module, a +5 V housekeeping supply is activated, providing power to the front panel ON/STBY switch and to the Environmental Controller (EC) on the Main Interface board. The EC continuously polls the front panel ON/STBY switch. Pressing the front panel ON/STBY button instructs the EC to activate a relay in the power supply module, activating the Main Power supply. The Main Power supply provides +5 V, +3.3 V, +12 V and --12 V to the circuits and other modules via the Main Interface board. The EC monitors all power supply voltages and shuts down the Main Power supply if a problem is detected.

Figure 1--1 on page 1-- 8 is a block diagram of the signal flow of the instrument. Figure 1--2 on page 1--9 is a block diagram of the control flow.

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1- 7

Theory of Operation

HD/SD

Serial In

AES

I/O

Ref In Loop

Through

VGA PIX Mon

PIX G/Y

PIX B/Pb

PIX R/Pr

Mezzanine

Board

I/O

Buffers

I/O

Buffers

Sampler

Eye

CPU

Board

Second

Input slot

Sync

Stripper

PLL Osc

FPGA for

Full-Speed Data

Massaging

HD SDClk

Serial to Parallel

Conversion

Generation

Input Module

Reference Module

TRS

DAC

HD/SD

Input

Board

Audio

Analog Bus

Main Interface Board

VGA

Controller

20 Bits at 75 MHz

plus clock and sync

Aux Out 1 Aux Out 2

Selector

Measurement

Processing

Picture Mode

Processing

Polyphase

Interpolator

Power Supply

Module

Figure 1- 1: WFM700 signal flow block diagram

1- 8

Audio Bus

RTD Module

Rasterizer

Fast Static

Memory

Timing Bus

Front panel controls

and touch screen

VGA MUX

output

WFM700 Series Waveform Monitors S ervice Manual

VGA

LCD

Panel

Theory of Operation

CPU Board

Input Module

Mezzanine Board HD/SD Input Board

RAM

Control

I/O

Buffers

PLD

PCI

Interface

Second Input slot

DSP 0

Bars, Control

Hardware Processing

AES Receivers, Rate Converters,

FPGA

FPGA for Full-Speed

Data Massaging

Audio Module

DSP 1

Bars, Lissajous

PCI

Interface

Serial Bus

Multiplexer

Main Interface Board

PCI Bus

Audio Bus

Serial Control Bus

Control

TRS Generation and control

Measurement

Processing

Logic Devices

Polyphase

Interpolator

Housekeeping Supply

Power Relay

Rasterizer

Recursive and

Pix Processing

Main Power

Supply

Figure 1- 2: Control flow block diagram

Reference Module

Fast Static

Memory

SDRAM

Power Supply Module

RTD Module

PCI

Interface

RS232

On-Off

RS232

Front panel controls

and touch screen

Environmental

Controller “EC”

VGA

Controller

VGA MUX

LCD

Panel

WFM700 Series Waveform Monitors S ervice Manual

1- 9

Theory of Operation

1- 10

WFM700 Series Waveform Monitors S ervice Manual

+ 164 hidden pages

Tektronix WFM700 Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Warranty 2

Table of Contents

List of Figures

List of Tables

General Safety Summary

Service Safety Summary

Preface

Manual Content

Manual Conventions

Related User Documents

Related Reference Documents

Contacting Tektronix

Theory of Operation

Operating Conditions

Overview

Individual Module Descriptions

Diagrams