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Tektronix WFM 601i User Manual

Tektronix WFM 601i User Manual

Serial digital component
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User Manual

WFM 601i
Serial Digital Component Monitor
070-8966-01
Please check for change information
at the rear of this manual.
First Printing: May 1994
Revised: November 1995

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  • Page 1: User Manual

    User Manual WFM 601i Serial Digital Component Monitor 070-8966-01 Please check for change information at the rear of this manual. First Printing: May 1994 Revised: November 1995...
  • Page 2 Information in this publication supersedes that in all previously published material. Specifications and price change privileges reserved. The following are registered trademarks: TEKTRONIX and TEK. For further information, contact: Tektronix, Inc., Corporate Offices, P.O. Box 1000, Wilsonville, OR 97070–1000, U.S.A. Phone: (503) 627–7111; TLX: 192825; TWX: (910) 467–8708; Cable: TEKWSGT.
  • Page 3 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.
  • Page 5 IEC 801-4 Electrical Fast Transient/Burst Immunity High-quality shielded cables must be used to ensure compliance to the above listed standards. This product complies when installed into any of the following Tektronix instrument enclosures: 1700F00 Standard Cabinet 1700F02 Portable Cabinet 1700F05 Rack Adapter...
  • Page 6 MULTIPLE PICTURE BOWTIE VIDEO IN SWEEP MENU LINE FILTER FIELD CURSOR LIN SEL –.1 –.2 PRESET –.3 SERIAL CONFIG COMPONENT ANALOG 2% & 4% K SERIAL A SERIAL B ALARM GAIN CLEAR MENU POWER WFM 601i Serial Digital Component Monitor...

  • Page 7: Table Of Contents

    ..........1–13 Installing the WFM 601i in a Serial Video System ..... . .
  • Page 8 ......... . . C–4 WFM 601i Serial Component Monitor...
  • Page 9 Figure 1-11: Eye pattern display of a termination with poor return loss. 1–16 Figure 1-12: Channel 1 of color bar with level reference on the WFM 601i. 1–19 Figure 1-13: Eye pattern display....... .
  • Page 10 Figure 3-13: Construction of the Diamond GBR display....3–24 Figure 3-14: Typical Bowtie display on the WFM 601i....3–25 Figure B-1: REMOTE connector.
  • Page 11 Table 1–1: Serial Output Jumper Settings (J6 Deserializer board) ..1–6 Table 3–1: Risetime conversions for WFM 601i ....3–8 Table A–1: Waveform Vertical Deflection...
  • Page 12 Contents WFM 601i Serial Component Monitor...

  • Page 13: Safety Summary

    A protective-ground connection by way of the grounding conductor in the power cord is essential for safe operation. WFM 601i Serial Component Monitor...
  • Page 14 Do Not Service Alone Do not perform internal service or adjustment of this product unless another person capable of rendering first aid and resuscitation is present. viii WFM 601i Serial Component Monitor...

  • Page 15: Manual Overview

    Preface This manual is a guide for operators of the WFM 601i monitor. Please complete and mail the “Business Reply Card” at the front of this manual to receive a service manual when it becomes available. Manual Overview provides the material needed to place the instrument in service.
  • Page 16 Preface WFM 601i Serial Component Monitor...

  • Page 17: Getting Started

    Getting Started...

  • Page 19: Product Description

    Product Description The WFM 601i is capable of measuring and monitoring 4:2:2 component serial digital. It displays the video signal in the familiar component analog representation, either paraded or overlaid. An equivalent time sampler is incorporated to show the eye pattern of the serial signal. Data integrity is verified by the EDH (Error Detection and Handling) system, and by a suite of serial digital format checks.

  • Page 20: Accessories

    Replacement Fuse Cartridge: 3AG, 2A, 250V, fast-blow (159–0021–00) Replacement Graticule Light Bulbs (150–0168–00) Replacement Air Filters for Fan (378–0335–00) 75 End-line Terminations: 26 dB to 300 MHz (011–0163–00) Smoke Grey CRT Filter (installed on instrument) (378–0258–00) 1–2 WFM 601i Serial Component Monitor...
  • Page 21 Product Description Optional Accessories The following items can be ordered with the monitor, or purchased through a Tektronix field office or distributor. When ordering, include both the name and number of the option. Viewing Hood (016-0475-00) Front Panel Cover (200-3897-01) Camera, C9 Option 20 —...

  • Page 22: Options

    Power Cord Options Power cord options are the only options currently available. Any of the following power cord options can be ordered for the WFM 601i Serial Component Monitor. If no power cord option is specified, instruments are shipped with a North American 125 V power cord and one replacement fuse.

  • Page 23: Installation

    Installation Packaging At installation time, save the shipping carton and packing materials (including anti-static bag) in case it becomes necessary to ship the instrument to a Tektronix Service Center for service or repair. Repackaging for Shipment If it becomes necessary to ship the instrument to a Tektronix Service Center for service or repair, follow these instructions for repackaging: 1.

  • Page 24: Packaged Accessories

    Deserializer board, can be changed so that the Serial Output is 740 mV. Table 1–1 gives the jumper settings. Looking at the front of the WFM 601i, the Deserializer board is located on the left hand side, near the rear instrument.

  • Page 25: Mechanical Installation

    To guarantee compliance with specifications, the instrument should be operated in a cabinet. The plain cabinet, 1700F00, is shown in Figure 1-1. NOTE. To meet EMI emission specifications, the WFM 601i must be installed in a Tektronix 1700F00, 1700F02, or 1700F05 enclosure. The enclosure front edges must securely contact the instrument’s conductive front bezel on all four sides.

  • Page 26: Figure 1-2: 1700F02 Portable Cabinet

    Installation this cabinet, as is the 1700F05 side-by-side rack mount assembly. All of these cabinets are available from Tektronix. If you need one of these cabinets, contact your nearest Tektronix field office or representative for assistance in ordering. 8.250 0.688 6.875...

  • Page 27: Figure 1-3: Rear View Of The Wfm 601I

    The optional 1700F05 side-by-side rack adapter, shown in Figure 1-4, consists of two attached cabinets. It can be used to mount the WFM601i and another half-rack width instrument, such as an analog component monitor (Tektronix WFM300A or 1760-Series), in a standard 19-inch rack.

  • Page 28: Figure 1-5: Instrument In 1700F05 With Blank Front-Panel (1700F06)

    17.270 Holes Rear View Figure 1-4: The 1700F05 side-by-side rack adapter. The rack adapter is adjustable, so that the WFM 601i can be more closely aligned with other equipment in the rack. See Figure 1-4. 1700F05 1700F06 Figure 1-5: Instrument in 1700F05 with blank front-panel (1700F06).

  • Page 29: Figure 1-6: 1700F05 Cabinet With 1700F07 Utility Drawer

    If only one side of the rack adapter is used, a 1700F06 Blank Panel can be inserted in the unused section. See Figure 1-5. The rack adapter and panel are available through your local Tektronix field office or representative. When only one instrument is mounted in the side-by-side adaptor an accessory drawer (1700F07) can be installed in the blank side of the cabinet.

  • Page 30: Figure 1-7: Custom Installation Considerations

    For Protruding Front Molding: Cut hole in panel the same size as the opening in the monitor cabinet to al- low the front panel molding to cover the hole. Figure 1-7: Custom installation considerations. 1–12 WFM 601i Serial Component Monitor...

  • Page 31: Connecting Power

    Eight front-panel setups can also be stored and recalled through the Remote connector. See Appendix B. RS232 Connector The rear-panel RS232 connector is a 9-pin subminiature D-type connector that provides a serial interface for calibration. The RS232 pin assignments are given in Appendix B. 1–13 WFM 601i Serial Component Monitor...

  • Page 32: Installing The Wfm 601I In A Serial Video System

    Figure 1-8: Monitoring the video bit stream of a serial receiver. The WFM 601i can also be used to check serial digital signals around a routing switcher. It is possible to look at all the inputs to the switcher with the use of a patch panel and the serial monitor.

  • Page 33: Figure 1-9: Monitoring Serial Digital Signals Around A Routing Switcher

    WFM 601i is sufficiently high that, in most cases, the system return loss will be set by that of the destination receiver. In cases where the WFM 601i is placed at the end of a link, a bnc termination must be installed on the other side of the loop-through. This connection might be used to measure a source, for example.

  • Page 34: Figure 1-10: Eye Pattern Display Of A Termination With Good Return Loss

    Installation A terminator can be inspected for return loss problems using the WFM 601i and a serial source with low aberrations, such as the TEKTRONIX TSG 422, Option 1S Digital Component Generator. Connect the generator serial output to one side of the WFM 601i loop-through and place the terminator on the other side.

  • Page 35: Functional Check

    Functional Check The following procedure is provided to aid in obtaining a display on the WFM 601i Serial Component Monitor. It is designed for operator familiarization and as a check of basic instrument operation. Only instrument functions, not measurement quantities or specifications, are checked in this procedure.

  • Page 36: Initial Equipment Connections

    Functional Check Initial Equipment Connections Connect the WFM 601i to an appropriate AC power source. Connect the component serial digital signal to SER A and terminate the other side of the loop-through with a 75 terminator. This procedure does not check at the Monitor Out, but if there is a GBR or Y–P...

  • Page 37: Figure 1-12: Channel 1 Of Color Bar With Level Reference On The Wfm 601I

    COMPONENT ANALOG 2% & 4% K Figure 1-12: Channel 1 of color bar with level reference on the WFM 601i. Press the top front-panel bezel button to select READOUT. One of the knobs now controls the readout intensity. Adjust the control to the desired level.

  • Page 38: Figure 1-13: Eye Pattern Display

    10 EYE mode. Press the CONFIG button to remove the menu from the display. Press the EYE/EQ EYE button and check that the EQ EYE indicator is illuminated. EQ EYE displays the signal after serial receiver equalization. 1–20 WFM 601i Serial Component Monitor...
  • Page 39 Functional Check 4. Parade Display The WFM 601i can display the YP components in the Parade mode. To display the INPUT signals in a paraded display, press the PARADE button. Check that the PARADE indicator lights. Press the CH 2 button and check that both the CH 1 (luminance) signal and the CH 2 (P ) signal are displayed.

  • Page 40: Figure 1-16: Wfm 601I On Screen Rgb Display

    Figure 1-16: WFM 601i on screen RGB display. 6. Check Gain The WFM 601i has an internal calibration signal which can be used to check the vertical and horizontal calibration. To display the calibration signal, press the CONFIG button to enter the configure menu. Select CALIBRATE by turning the knob under the list of configuration categories until CALIBRATE is highlighted.

  • Page 41: Figure 1-17: Wfm601I Calibrator Display

    Push the RESET H CAL and note that the horizontal gain returns to one cycle per division and the RESET H CAL label disappears. Exit the configure menu by pressing the CONFIG button. The calibrator signal is automatically turned off. Rev May 1994 1–23 WFM 601i Serial Component Monitor...

  • Page 42: Figure 1-18: Calibrator Signal, Both Gains Misadjusted

    Return the gain to normal by pressing the GAIN button to exit the gain menu. The next time the gain menu is entered, the settings will be the same (variable X10 gain). Adjust the VERT POS control to place the signal on the baseline. Rev Jun 1994 1–24 WFM 601i Serial Component Monitor...

  • Page 43: Figure 1-19: One Field Display Of Ch 1 (Y) Signal

    LINE/FIELD button twice to return to the 2 LINE (10 s/Div) display. 100% –.1 –.2 –.3 COMPONENT ANALOG 2% & 4% K Figure 1-20: Two field display of CH 1 (Y) signal. Rev Jun 1994 1–25 WFM 601i Serial Component Monitor...

  • Page 44: Figure 1-21: Two Line Magnified Display

    Figure 1-21: Two Line Magnified Display. 10. Flat or Differentiated Filter Selection The WFM 601i offers the selection of an unfiltered display (FLAT), a 1 MHz low-pass filter (LPASS), or a differentiated step (DIFF) filter for the waveform display. The normal display is unfiltered. Press the FILTER button to enter the filter menu.

  • Page 45: Figure 1-22: A Two-Line Differentiated Step Display

    Figure 1-22: A two-line differentiated step display. 11. Line Select The WFM 601i can display one line out of two fields, one line in both fields or up to 15 continuous lines in either or both fields. Display can be 1 line, 2 lines, 1 field, or 2 fields.

  • Page 46: Figure 1-23: Two Field Line Select Display; Line Number 150 Selected

    Line select is available for the WAVEFORM, VECTOR, PICTURE and LIGHTNING displays. When line select is used in the MULTIPLE display mode, the displays appear in the following order: WAVEFORM, VECTOR. Rev Jun 1994 1–28 WFM 601i Serial Component Monitor...

  • Page 47: Figure 1-25: Vector Color Bar Display With Electronic Graticule

    2 LINE (10 s/Div) sweep. 12. Vector Display The WFM 601i vector display uses an electronic graticule. Amplification of the vertical and horizontal axes for both the signal and the graticule are the same, which eliminates errors due to CRT geometry anomalies.

  • Page 48: Figure 1-26: Picture Monitor Display Of The Color Bar Signal

    Measurement Applications Press the VECTOR/LIGHTNING button to select LIGHTNING. Check that the LIGHTNING indicator lights and that the display changes to the LIGHTNING display. See Figure 1-27. Rev Jun 1994 1–30 WFM 601i Serial Component Monitor...

  • Page 49: Figure 1-27: Lightning Display Of Component Color Difference Signals

    Press the CONFIG button to enter the CONFIGURATION menu. In the WFM/VEC submenu, press the bezel button corresponding to LIGHTNING/DIAMOND DISPLAY. Check that DIAMOND is highlighted and the display changes to the DIAMOND display. See Figure 1-28. Figure 1-28: Diamond display. Rev Jun 1994 1–31 WFM 601i Serial Component Monitor...

  • Page 50: Figure 1-29: The Bowtie Display

    (500 kHz) signal with markers. Press the BOWTIE DISPLAY button. Check that the BOWTIE indicator lights and the display changes to the BOWTIE display. See Figure 1-29. Figure 1-29: The Bowtie display. Rev May 1994 1–32 WFM 601i Serial Component Monitor...

  • Page 51: Operating Basics

    Operating Basics...

  • Page 53: At A Glance

    At A Glance The following is an overview of the front–panel controls and rear–panel connectors for the WFM 601i Serial Component Monitor. SERIAL COMPONENT MONITOR DISPLAY VECTOR WAVEFORM LIGHTNING PARADE EQ EYE 100% MULTIPLE PICTURE BOWTIE VIDEO IN SWEEP MENU...
  • Page 54 EYE modes = 0.5 ns/Div One line sweep rate = 200 ns/division Two line sweep rate = 1 µs/division 25X magnification for 1- and 2-field sweep rates. Rev May 1994 2–2 WFM 601i Serial Component Monitor...
  • Page 55 ALARM — Lights when a serial video data or format error occurs, or the serial signal is lost. A GAMUT ERROR readout will appear at the lower left CRT corner when an RGB gamut error is detected by the WFM 601i. This indicator can be turned off in the CONFIGURE\GAMUT menu. Rev May 1994 2–3...

  • Page 56: Rear Panel Connectors

    At A Glance Rear Panel Connectors The following is an overview of rear-panel connectors. Figure 2-2 shows the WFM 601i rear panel. Power Connector This instrument is intended to operate from a single-phase power source with one current-carrying conductor at or near earth-ground (the neutral conductor).
  • Page 57 SERIAL OUT — Reclocked serial output of selected signal input (SER A or SER B). Multi-pin Connectors RS232 — A 9-pin subminiature D-type connector that provides a serial interface for calibration. REMOTE — A 25-pin subminiature D-type connector that provides limited remote control functions. 2–5 WFM 601i Serial Component Monitor...
  • Page 58 At A Glance 2–6 WFM 601i Serial Component Monitor...

  • Page 59: Video Display Modes

    The angle represents chrominance phase and the distance from the center represents chrominance amplitude. Lightning The front-panel LIGHTNING button is used to select either the Lightning display or the Diamond display. To select which one to display, go to the 2–7 WFM 601i Serial Component Monitor...
  • Page 60 When Multiple display is selected, Waveform or Parade can be displayed at the same time as Vector or Lightning (or Diamond). When exiting Multiple display, the instrument will return to the previous display settings. When multiple is re-selected, the previous Multiple display settings will be restored. 2–8 WFM 601i Serial Component Monitor...

  • Page 61: Eye Pattern Display

    10 EYE – In 10-EYE every tenth bit of the scrambled serial signal appears at a fixed location in the display. Events that are correlated with the serial word rate, or horizontal line rate, can be observed in this mode. The horizontal deflection factor is calibrated at 3 ns/div. 2–9 WFM 601i Serial Component Monitor...

  • Page 62: Figure 2-4: 10-Eye Display Screen

    20 mV/div in X5 and 10 mV/div in X10. Variable Gain also works in the EYE pattern modes. When Variable Gain is enabled, a “>” is placed in front of the deflection factor to indicate the uncalibrated condition: e.g. “>100 mV/DIV.” 2–10 WFM 601i Serial Component Monitor...

  • Page 63: Serial Readout Screens

    Both 1H and 15H modes are available. Serial Readout Screens The WFM 601i has two readout screens that display information about the serial signal. The STATUS screen provides basic information about the signal, such as signal presence, line rate, Audio and Anc Data presence, and error rate.

  • Page 64: Figure 2-5: Basic Status Screen

    Figure 2-6 shows how the STATUS screen would look in this case. Only EDH anc data is present. Both full field and active picture CRCs are incoming for error monitoring. 2–12 WFM 601i Serial Component Monitor...

  • Page 65: Figure 2-6: Status Screen With 525 Line, 10-Bit Video

    AP CRC ERR SEC FORMAT STATUS MISSING F1 AP CRC VALUE FOC8 F2 AP CRC VA;UE EA26 CHANGE SINCE RESET 0 DAY ELAPSED TIME 10:12:25 RESET Figure 2-7: Loss of signal condition is indicated. 2–13 WFM 601i Serial Component Monitor...

  • Page 66: Figure 2-8: Basic Format Screen

    ANC PARITY Indicates an error if a parity error has occurred in ancillary data. ANC CHECKSUM Indicates an error if an ancillary data checksum error has occurred ANC PLACEMENT Indicates an error if ancillary data is improperly placed with respect to active video. 2–14 WFM 601i Serial Component Monitor...

  • Page 67: Using The Menus

    BEZEL CONTROLS (Turns Off Menu Read- (Rotates Selection Through out & Disables Further List Of Functions, Function Selection.) Or Makes Control Functionally Assigned.) Figure 2-9: Elements of the WFM601i menu driven selections. Rev May 1994 2–15 WFM 601i Serial Component Monitor...
  • Page 68 In 15H mode the display will consist of 15 lines overlaid. Again the readout will be a range of lines. The NEXT FIELD selection comes up when 1 OF 2 FIELD is selected and allows the operator to toggle between fields 1 and 2. 2–16 WFM 601i Serial Component Monitor...
  • Page 69 RECALL – Sets the front panel to the stored settings previously loaded into that memory location. STORE – Wipes out the currently stored settings, in the selected memory location, and replaces them with the current front–panel settings. 2–17 WFM 601i Serial Component Monitor...

  • Page 70: Figure 2-11: Configure Menu Screen

    350 mV GAMUT EAV-SAV FORMAT PASS STRIP CALIBRATE Figure 2-11: Configure menu screen. In addition to the functions enabled by the CONFIG menu, the software and coprocessor version number are found on the CALIBRATE submenu. 2–18 WFM 601i Serial Component Monitor...
  • Page 71 Alarm light will stay continuously lit. One second after the last selected alarm condition clears, the light will go out. When the alarms are enabled the following conditions will turn on the alarm indicator: Rev May 1994 2–19 WFM 601i Serial Component Monitor...
  • Page 72 GAMUT ERROR readout in the lower left corner of the CRT. FORMAT Selects the format of the picture monitor out signal and the scanning standard expected by the WFM 601i. MONITOR OUT AS – Configures the analog component picture monitor out signal as either Y, Pb, Pr, (YPBPR) or as GBR (GBR).
  • Page 73 HORIZ POS is now the readout intensity control and turning it clockwise increases the readout intensity. Pressing either the CLEAR MENU or the CRT menu button exits the menus. Rev May 1994 2–21 WFM 601i Serial Component Monitor...

  • Page 74: Remote Operation

    The user can store and recall up to eight front-panel setups through the remote. Remote connector pin assignments are described in Appendix B. Using Presets through the The WFM 601i has 10 presets capable of storing front-panel setups. Presets one Remote through eight are accessible through the rear-panel REMOTE connector. A TTL low or ground closure on one of the PRESET pins selects the front-panel setup stored at that preset location.

  • Page 75: Functional Overview

    If the RESET H CAL readout is on, push the adjacent bezel button. c. Pushing RESET H CAL reinstates the gain setting established at the last calibration. d. Check to see that there is one half cycle/division (1-line sweep) or one cycle/division (2-line sweep). 2–23 WFM 601i Serial Component Monitor...
  • Page 76 Functional Overview 2–24 WFM 601i Serial Component Monitor...
  • Page 77 Reference...

  • Page 79: Graticules

    Graticule illumination can be adjusted through the CRT menu to provide optimum brightness for viewing or photographing displays. In addition to the CRT graticules, the WFM 601i displays electronic graticules in the Vector, Lightning, and Diamond display modes. See Page 3–3 for a discussion of the electronic graticules.
  • Page 80 When the sweep is magnified the scale on the baseline equals 1 s per major division and 200 ns per minor division in 2 line sweep, and 500 ns per major division and 100 ns per division for 1 line sweep. 3–2 WFM 601i Serial Component Monitor...

  • Page 81: Electronic Graticules

    2% of the 700 mV, or 14 mV. Lightning Graticule Figure 3-3 shows the graticule that appears when the WFM 601i is operating in the Lightning mode. This graticule matches the format of the display when component signals are applied to the instrument. The graticule targets indicate a tolerance of 14 mV.

  • Page 82: Figure 3-3: Lightning Display Graticule

    Errors in green amplitude affect both diamonds equally, while blue amplitude errors affect only the top diamond and red errors affect only the bottom diamond. See Figure 3-4. Figure 3-4: Graticule for the Diamond display. 3–4 WFM 601i Serial Component Monitor...

  • Page 83: Measurement Applications

    Measurement Applications The WFM 601i is capable of making a broad variety of measurements, ranging from the familiar analog component measurements to methods for evaluating the wideband serial digital channel. This section will describe several representative measurements. Measuring Serial Sources A typical serial transmission system consists of a transmitter (source), the coaxial cable channel, and a receiver.
  • Page 84 10%. At this level they are not likely to degrade system performance. To measure aberrations with the WFM 601i, use the Variable Gain to obtain a 10 division display. Aberrations should not exceed 1 division.

  • Page 85: Figure 3-6: Measuring 20–80% Risetime Using Cursors

    –.3 Figure 3-6: Measuring 20–80% Risetime using cursors. The WFM 601i Eye display has a –3 dB bandwidth of approximately 450 MHz. This is a 20 – 80% risetime of 500 ps. This finite risetime must be considered when determining the actual risetime of the source being measured. The actual...

  • Page 86: Table 3–1: Risetime Conversions For Wfm 601I

    D/A conversion. The WFM 601i incorporates three different jitter high pass filters: 10 Hz, 100 Hz, and 1 kHz. With these filters the Eye pattern display will only show those jitter terms above the selected high pass.
  • Page 87 This is the approach taken by the WFM 601i. Suggested jitter limits are 740 ps p-p, measured with the 1 kHz jitter HPF. If composite D/A conversion will be done, a 740 ps p-p limit with the 10 Hz jitter HPF is suggested.

  • Page 88: Monitoring Transmission Channels

    This is especially useful when “proofing” a newly installed system. Recommended Monitoring The WFM 601i, with its passive loopthrough serial inputs, can either be used as Connections a bridging or terminating input device. Depending on the measurement application, one connection may be more effective than the other.
  • Page 89 Ideally, this restores the wave shape to what it was at the source. In EQ EYE the output of the WFM 601i serial receiver equalizer is displayed. This allows the eye pattern to be viewed after even several hundred meters of coax.

  • Page 90: Measuring Error Rate

    Measurement Applications Measuring Error Rate The WFM 601i features two methods of determining if a serial video system is operating error free. The first uses the CRC check-word system documented by SMPTE RP 165, often referred to as EDH. The second uses a fixed pattern test signal.
  • Page 91 This forms a “single ended” error detection system that does not require EDH. Connect the WFM 601i as shown in Figure 3-7. The source does not need EDH, but it must be a fixed pattern signal (repeating every two fields). Display the SERIAL STATUS screen.

  • Page 92: Advanced Eye Pattern Modes

    Since the WFM 601i gives the AP CRC Values, this can be used to verify proper operation of a video processor given a specified test signal. For example, a manufacturer could specify the expected CRC values for various operating modes with a given test signal.
  • Page 93 Measurement Applications The WFM 601i has two trigger modes for the Eye pattern displays: 10-EYE and OVERLAY. In 10-EYE the Eye pattern display is triggered on parallel word/tv-line boundaries, with 10 eyes shown per sweep. Parallel word and tv-line correlated behavior can be seen in this mode. If a serial system is...

  • Page 94: Using The Diamond Display

    WAVEFORM, PARADE, VECTOR, and LIGHTNING display modes. Using the Diamond Display The WFM 601i features the Tektronix “Diamond” display. The primary use of this display is to check video signals for proper RGB Gamut, and to assist in RGB signal manipulation.

  • Page 95: Figure 3-8: Construction Of The Diamond Display

    +700 mV Legal G and B space reen +700 mV +700 mV reen Legal G and R space +700 mV X-Y plot. Rotated 45 degrees. Origins moved together. Figure 3-8: Construction of the Diamond Display. 3–17 WFM 601i Serial Component Monitor...

  • Page 96: Figure 3-9: Out-Of-Gamut Signals As Displayed By Diamond

    The Lightning display plots luminance against each of the color difference components. It should be used when manipulating signals by varying the luminance and color difference components. Diamond is the best choice when manipulating signals with R, G, and B controls. 3–18 WFM 601i Serial Component Monitor...

  • Page 97: Measurement Theory

    Although the serial bit stream may not be repetitive, the eye display formed by overlaying the bit patterns is repetitive. In the case of the WFM 601i, the eye pattern sampler samples at 7 MHz, with an equivalent time bandwidth of at least 450 MHz.

  • Page 98: Figure 3-10: Vector Display Relationship Of The R–Y (V) And B–Y (U)

    B–Y OR U Figure 3-10: Vector display relationship of the R–Y (V) and B–Y (U). The electronic graticule for the WFM 601i provides vector targets that are of B–Y and R–Y amplitudes. This differs from composite vectorscope targets, which are sectors indicating a polar, magnitude and phase error. These are the errors most often caused by the coding, transmission and decoding of the 3–20...

  • Page 99: Lightning Display

    The information that we can obtain from this display is color difference signal accuracy (horizontal displacement of either half of the display), luminance gain (vertical displacement between the black and white levels), timing delay between either color difference signal and luminance (bending of 3–21 WFM 601i Serial Component Monitor...

  • Page 100: Figure 3-12: Lightning Graticule Showing Interchannel Timing Errors

    P gain. If the color bar signal dots are within the horizontal dimensions of the appropriate graticule targets, the P and P gains are within 2% of the correct amplitude. 3–22 WFM 601i Serial Component Monitor...

  • Page 101: Diamond Display

    Y, P , and P each of the eight primary colors. Diamond Display The WFM 601i converts the Y, P and P components recovered from the serial signal to R, G, and B to form the Diamond display.

  • Page 102: Bowtie Display

    A special test signal is required for this display. The Tektronix TSG-422, Option 1S provides this type of signal and a set of time marks to aid in signal evaluation. The signal is a 500 kHz sinewave on channel 1 (luminance) and 502 kHz sinewave on channels 2 and 3 (color difference signals).

  • Page 103: Figure 3-14: Typical Bowtie Display On The Wfm 601I

    Measurement Theory Figure 3-14: Typical Bowtie display on the WFM 601i. The bowtie test signal and display method provides better resolution and is easier to use than the color bar test signal with the waveform or lightning display to make relative channel timing measurements. Changes in location of the null indicate a difference in the relative timing.
  • Page 104 Measurement Theory 3–26 WFM 601i Serial Component Monitor...
  • Page 105 Appendices...

  • Page 107: Appendix A: Specifications

    1% to 2.75 MHz for the color difference (P 2.5 MHz ) channel. Line sweep from a 4:2:2 digital signal generator. Transient Response Preshoot Overshoot Ringing Pulse-to-bar ratio 0.99:1 to 1.01:1 Field Rate Tilt A–1 WFM 601i Serial Component Monitor...

  • Page 108: Table A–2: Serial Digital Video Interface (Ser A & Ser B)

    150 meters (490 feet) using Belden 8281 coaxial Proper operation with up to 14.5 dB loss at 135 MHz Equalization Range cable. using coaxial cable having loss characteristics. 800 mV launch amplitude. Rev Apr 1994 A–2 WFM 601i Serial Component Monitor...

  • Page 109: Table A–3: Serial Video Output (Follows Ser A/B Channel Selection)

    Parades bits 0-9 in a 10-Eye display. Useful for observing word and line correlated jitter. Deflection Factor Vertical 800 mV 5% with an 800 mV input Horizontal Overlay Mode 1 ns/Div 10-Eye Mode 3 ns/Div Mag On 500 ps/Div A–3 WFM 601i Serial Component Monitor...

  • Page 110: Table A–5: Video Error Detection And Diagnostics

    Absolute Maximum Input –8.5 V to +8.5 V, dc plus peak ac Voltage DC Input Impedance 20 k Return Loss 40 dB to 6 MHz Typically 46 dB to 6 MHz; 40 dB to 10 MHz A–4 WFM 601i Serial Component Monitor...

  • Page 111: Table A–7: Waveform Horizontal Deflection

    Horizontal to Vertical 2 at 500 kHz and 2 MHz Bandwidth Matching Vertical Gain Accuracy Horizontal Gain Accuracy Display to 0.25 box with the color bar black display dot Graticule Registration centered in target. A–5 WFM 601i Serial Component Monitor...

  • Page 112: Table A–10: Lightning And Diamond Mode

    Table A–12: Picture Monitor Outputs Characteristic Performance Requirement Reference Information Signal Format EBU/N10 Active Video Accuracy 700 mV Typically <1% Sync Amplitude Accuracy 300 mV Monitor Output Impedance Nominally 75 ; back porch clamped to 0 V. A–6 WFM 601i Serial Component Monitor...

  • Page 113: Table A–13: Power Source

    Non Operating: 50 g’s 1/2 sine, 11 ms duration 3 shocks per surface (18 total) Transportation Qualified under NSTA Test Procedure 1A, Category II (24 inch drop) Equipment Type Measurement Equipment Class IEC 1010–1, Annex H, Class III A–7 WFM 601i Serial Component Monitor...

  • Page 114: Table A–16: Certification

    Physical Characteristics Characteristic Description Dimensions Height: 5 1/4 inches (133.4 millimeters) Width: 8 1/2 inches (215.9 millimeters) Depth: 18 1/8 inches (460.4 millimeters) Weight Net: 8 pounds (3.8 kilograms) Shipping: 15.7 pounds (7.2 kilograms) approximate A–8 WFM 601i Serial Component Monitor...

  • Page 115: Appendix B: Multipin Connectors

    Appendix B: Multipin Connectors Appendix B: Multipin Connectors REMOTE Connector The rear-panel REMOTE connector is a 25-pin, D-type connector that is the remote control interface. Remote functions, which provide switching and recalling of stored front-panel setups from a remote location, are enabled by ground closures (TTL lows). Functions with “overbars”...
  • Page 116 Appendix B: Multipin Connectors Table B–1: Remote Connector Pin Assignments and Functions (Cont.) Number Function Signal Requirement Miscellaneous Information B–2 WFM601i Serial Component Monitor...

  • Page 117: Rs232 Connector

    Appendix B: Multipin Connectors Table B–1: Remote Connector Pin Assignments and Functions (Cont.) Number Function Signal Requirement Miscellaneous Information RS232 Connector The RS232 connector is a 9-pin D-type connector that is provided as the calibration interface. See Figure B–2. The WFM601i is intended to be calibrated with a Personal Computer (PC).
  • Page 118 Appendix B: Multipin Connectors B–4 WFM601i Serial Component Monitor...

  • Page 119: Appendix C: User Service

    The line fuse for this instrument is located inside the cabinet, under a protective shield. Replacement of this fuse should only be undertaken by a qualified service technician, following the instructions in the WFM 601i Service Manual. Graticule Light Replacement Replacement Bulbs Replacement bulbs are supplied with this instrument as Standard Accessories.

  • Page 120: Figure C-1: Graticule Light Replacement

    Appendix C: User Service NOTE. For graticule light removal and replacement, tweezers with curved, serrated tips are recommended. For example, Miltex PL312,6-100 (equivalent to PL312) or PL317 (longer than PL312). Procedure 1. Remove the five knobs below the CRT. 2. Insert a small, straight-blade screwdriver into the recessed area on either the right or left side of the panel.

  • Page 121: Cleaning

    Clean the light filter and CRT face with a soft, lint-free cloth dampened in denatured alcohol. Abrasive cleaners should not be used. Interior Interior cleaning and maintenance should be performed by qualified service personnel only. Instructions for interior maintenance are provided in the WFM 601i Service manual. WFM601i Serial Component Monitor C–3...

  • Page 122: Replacing The Crt Filter

    Appendix C: User Service Replacing the CRT Filter A smoke-gray filter is installed over the face of the CRT. If the filter becomes damaged, it can be replaced in the following manner: 1. Remove the five knobs below the CRT. 2.
  • Page 123 Glossary...
  • Page 125 R–Y and B–Y to the luminance signal for NTSC systems or U and V to the luminance signal for PAL systems. dB (Decibel) A decibel is a logarithmic unit used to describe signal ratios. For voltages, dB = 20 Log Glossary–1 WFM 601i Serial Component Monitor...
  • Page 126 (Y, P ), that plots the two color difference signals against luminance to create a display similar in appearance to a lightning bolt. Linear Distortion Refers to distortions which are independent of signal amplitude. Glossary–2 WFM 601i Serial Component Monitor...
  • Page 127 Termination In order to accurately send a signal through a transmission line, there must be an impedance at the end which matches the impedance of the source and of the line itself. Amplitude errors and reflections will otherwise Glossary–3 WFM 601i Serial Component Monitor...
  • Page 128 Waveform Monitor A specialized oscilloscope that plots voltage versus time to evaluate television signals. Y Abbreviation for luminance. Glossary–4 WFM 601i Serial Component Monitor...
  • Page 129 Index...
  • Page 131 Index Instrument Calibration Interval, A–1 Rev Aug 1994 Index–1 WFM 601i Serial Component Monitor...
  • Page 132 Index Rev Aug 1994 Index–2 WFM 601i Serial Component Monitor...
  • Page 133 Index Index–3 WFM 601i Serial Component Monitor...

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