User Manual WFM 90 & WFM 91 Handheld Waveform, Vector, Picture, & Audio Monitor 070-8968-05 This document supports firmware version 1.00 and above.
Copyright Tektronix, Inc. All rights reserved. Tektronix products are covered by U.S. and foreign patents, issued and pending. Information in this publication supercedes that in all previously published material. Specifications and price change privileges reserved. Printed in the U.S.A. Tektronix, Inc., P.O. Box 1000, Wilsonville, OR 97070–1000 TEKTRONIX and TEK are registered trademarks of Tektronix, Inc.
WARRANTY 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.
Table of Contents Table of Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . General Safety Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . i vii ix Getting Started Product Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Key Features . . .
Table of Contents Installation Instrument Packaging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Unpacking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Packaging for Shipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . Travel Case . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Electrical Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Power Source . . . . . . . . . . . . . . . . . . . . .
Table of Contents Readout Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–8 Required Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Initial Equipment Connections . . . . . . . . . . . . . . . . . . . . . . Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–11 2–12 2–12 Tutorial Reference Using the Menus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . General Menu Information . . . .
Table of Contents Standard Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . Peak White . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . DC Restorer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Vector Graticule . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Chrominance Vector Targets . . . . . . . . . . . . . . . . . . . . . . . . Differential Phase and Gain Measurement Box . . . . . . . . . .
Table of Contents List of Illustrations Figure 1–1: Packing the Option 33 travel case . . . . . . . . . . . 1–11 Figure 1–2: Installed polarity of alkaline batteries . . . . . . . 1–13 Figure 1–3: Removing the NiCad battery pack . . . . . . . . . . 1–14 Figure 1–4: Installing the viewing hood . . . . . . . . . . . . . . . . . 1–15 Figure 1–5: Installing the desk stand . . . . . . . . . . . . . . . . . . . 1–16 Figure 2–1: WFM 90 keypad . . . . . . . . . . . . . . . . . . . . . . . . .
Table of Contents vi WFM 90 & WFM 91 User 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 Observe All Terminal Ratings. To avoid fire or shock hazard, observe all ratings and markings on the product.
General Safety Summary Safety Terms and Symbols 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.
Preface This manual is a guide for operators of the WFM 90 and WFM 91 Waveform, Vector, Picture, and Audio Monitor, and contains instructions for practical use. Throughout this manual, instrument controls and display readouts appear in ALL CAPITALS.
Preface The WFM 90 Handheld Waveform, Vector, Picture, and Audio Monitor x WFM 90 & WFM 91 User Manual
Getting Started: Product Description The Tektronix WFM 90 and WFM 91 is a handheld, self-contained, rasterizing television waveform/vector/picture/audio monitor. The instrument has a built-in LCD color display device and is powered by batteries or by an AC adapter producing 12 VDC. Applications The WFM 90 and WFM 91 can be used in traditional in-house applications of television production, post-production, and signal transmission.
Getting Started: Product Description Description of Features Rasterized Color LCD Display The WFM 90 and WFM 91 uses a proprietary rasterizer which displays analog waveforms or vectors on the color 4-inch diagonal, backlit thin-film transistor (TFT) LCD raster display, simultaneously with the appropriate measurement graticules. A viewing-angle control for the display permits optimal signal viewing from different positions.
Getting Started: Product Description NOTE. Only the NiCad battery pack recharges in the instrument. Alkaline batteries are not recharged. The message LOW BAT is displayed in the on-screen readout when the batteries get critically low on power. Menu-Assisted Monitoring Operation The menus use a combination of on-screen readout and multi-use buttons, in conjunction with the Arrow Buttons, to control most of the monitoring functions. Menus are entered by pressing one of the MENU, CONFIG, or LINE SEL buttons.
Getting Started: Product Description modes. The signal filters are Flat (no filter) and Luminance (low-pass filtered). The Line Select mode enables the selection of a single line of video for display. Vector Display Mode The Vector display mode presents an XY plot of the demodulated chrominance phase and amplitude portion of the video signal. The vector angle represents chrominance phase, and the distance from the center represents chrominance amplitude.
Getting Started: Product Description Vector, or Audio displays. The WIP window can be positioned to any one of the four corners of the display. The Arrow Buttons retain their default function for the display mode in the WIP window. Line Select Mode The Line Select mode enables the user to select any line of video for viewing in either the Waveform or Vector display modes. The desired line can be selected from either all video fields or from alternating fields.
Getting Started: Product Description More Information Instrument options and accessories, as well as ordering information, are listed beginning on page 1–7. Battery operation is discussed beginning on page 1–12. A tutorial covering basic instrument operation starts on page 2–11. Detailed menu descriptions begin on page 3–1. A complete listing of instrument performance specifications is located in Appendix A.
Options and Accessories This section lists the options which can be ordered as well as the standard and optional accessories for the WFM 90 and WFM 91. Ordering information is given at the end of the accessories list. Options The options listed below can be ordered with the WFM 90 and WFM 91. Listed with the power adapter options are the Tektronix part numbers to be used when ordering replacements.
Getting Started: Options and Accessories Accessories Standard accessories are shipped with every instrument while optional accessories must be ordered. Listed below are the standard and optional accessories for the WFM 90 and WFM 91 along with the Tektronix part number to be used when ordering.
Installation This section gives instructions for the mechanical and electrical installation of the WFM 90 and WFM 91. Included are directions for the packaging of the instrument for shipment. Instrument Packaging Unpacking Save the shipping carton and packing materials in case it becomes necessary to ship the instrument to a Tektronix Service Center for service or repair.
Getting Started: Installation 2. Package the instrument in the original packaging materials. If the original packaging materials are not available, follow these directions: a. Obtain a carton of corrugated cardboard having inside dimensions six or more inches greater than the dimensions of the instrument. Use a shipping carton that has a test strength of at least 250 pounds. b. Place the instrument in its carrying pouch or surround the instrument with a protective bag. c.
Getting Started: Installation 1 2 3 4 ÎÎÎÎÎÎ ÎÎÎÎÎÎ ÎÎÎÎÎÎ ÎÎÎÎÎÎ ÎÎÎÎÎÎÎÎÎÎÎÎÎÎ ÎÎÎÎÎÎ ÎÎÎÎÎÎÎÎÎÎÎÎÎÎ ÎÎÎÎÎÎ ÎÎÎÎÎÎ ÎÎÎÎÎÎÎÎ ÎÎÎÎÎÎÎÎ ÎÎÎÎÎÎÎÎ 5 6 Figure 1–1: Packing the Option 33 travel case 1 The pouch in the cover of the travel case holds signal cables and the user manual(s) for the instrument(s). 2 This compartment holds the WFM 90 or WFM 91 instrument, with the viewing hood slipping around the instrument. 3 This compartment holds the spare batteries for the WFM 90 or WFM 91.
Getting Started: Installation Electrical Installation Power Source The WFM 90 and WFM 91 are designed to operate from either six C-cell batteries, alkaline or rechargeable NiCad, or from an AC adapter wall unit producing 12 VDC. CAUTION. DC Power Source To avoid possible damage to the instrument circuitry when using a DC power source other than the supplied AC adapter, ensure that the DC source is a negative-ground 11 – 18 V system with a negative center lead.
Getting Started: Installation Battery Installation and Removal Replacing Alkaline Batteries. The WFM 90 and WFM 91 battery compartment is located under the back panel of the instrument. The battery compartment is opened by turning the screw head at the top of the panel 1/4 turn. A label on the bottom of the battery compartment illustrates the correct battery polarity. The polarity of the alkaline batteries must be correct for the instrument to operate.
Getting Started: Installation Replacing NiCad Batteries. The optional NiCad battery pack has a connector which fits on the jumper in the battery compartment. Be sure the battery connector tab snaps onto the jumper housing to prevent a loss of battery power. To remove the NiCad battery pack, grasp the batteries close to the wire leads. Use your thumb to press in on the top portion of the battery connector tab, and then pull gently upwards. Figure 1–3 shows how to remove the NiCad battery pack.
Getting Started: Installation Operational Jumpers The only operational modifications made to this monitor are done through the menu system. There are no internal jumper settings for modifying the operational configuration of the instrument. Mechanical Installation The WFM 90 and WFM 91 are offered with a viewing hood and desk stand as optional accessories that enhance its on-site use. The installation of these accessories is described below.
Getting Started: Installation Desk Stand The optional desk stand provides the user with a stable means to hold the instrument upright on a flat surface. The prongs of the stand are inserted into the holes in the back of the instrument as illustrated in Figure 1–5.
Operation Basics: Functional Overview This section describes the WFM 90 and WFM 91 controls and connectors. Descriptions of special operating modes begin on page 2–6. A tutorial which guides you through a procedure exercising the different functions of the instrument begins on page 2–11. Menu operation is detailed in Using the Menus, starting on page 3–1. Keypad Controls The keypad (front panel) is illustrated in Figure 2–1. Power Switch ON. The ON button toggles the instrument power on and off.
Operation Basics: Functional Overview Figure 2–1: WFM 90 keypad 2–2 WFM 90 & WFM 91 User Manual
Operation Basics: Functional Overview Menu Control Menu operation and selections are detailed in Using the Menus starting on page 3–1. MENU. Pressing the MENU button toggles the Operating menu on and off. The Operating menu contains monitoring selections which are specifically related to the currently selected display mode. Operating menu selections include signal gain and filtering, audio reference levels, and safe action and title outlines. CONFIG.
Operation Basics: Functional Overview Instrument Reset Extraordinary conditions may cause the WFM 90 and WFM 91 controls to become locked or to respond erratically. To reset the instrument, first press the ON button to turn off the power, then press the ON button again while holding down the WIP and LINE SEL buttons. The instrument should return to normal operation with the keypad controls and menu selections assigned to the factory-set defaults.
Operation Basics: Functional Overview Audio Input and Output Connectors AUDIO IN. A standard three-pin XLR connector for a single channel of audio input.
Operation Basics: Functional Overview Audio Out. A standard stereo mini-headphone jack for the output of the audio input signal. The mono input signal is heard on both stereo channels. The audio volume is fixed for each reference level. The larger the displayed signal, the louder the volume. DC Power Input Connector DC IN 11 – 18 V. A 2 mm plug which accepts a 12 VDC power input using a negative center lead. CAUTION.
Operation Basics: Functional Overview Variable Gain Mode The Variable Gain mode allows the user to vary signal gain for the Waveform and Vector displays between 45% and 155%. The mode is enabled through a menu selection in the Configuration menu. The variable gain adjustment tracks between the Waveform and Vector display modes, and can be adjusted from the Waveform-inPicture display mode. When the Variable Gain mode is enabled, the message GAIN UNCAL is displayed in the on-screen readout.
Operation Basics: Functional Overview CAUTION. Instrument Adjustment Do not attempt to adjust the instrument without using the instructions listed in the service manual, or your instrument may not meet the published specifications. On-Screen Readout The WFM 90 and WFM 91 use on-screen messages to alert the user to certain monitoring conditions. Figure 2–3 shows the readout messages and their locations. 1 4 GAIN UNCAL SYNC MISSING 100 2 3 EXT REF 10uS/DIV VX.
Operation Basics: Functional Overview 2 The EXT REF message appears in the Waveform and Vector display modes when the video signal is locking to an external video reference signal. 3 The sweep rate is only displayed in the Waveform display mode. There is no sweep rate readout when 2 Field sweep is selected. 4 The MISSING SYNC message appears in all video display modes when the signal reference has been lost.
Operation Basics: Functional Overview 2–10 WFM 90 & WFM 91 User Manual
Tutorial The following tutorial guides you through a procedure which exercises the different functions of the WFM 90 and WFM 91. The procedure is designed for operator familiarization and for checking basic instrument operation (not measurement quantities or specifications). The tutorial is written with the assumption that you have read the Functional Overview section which starts on page 2–1.
Operation Basics: Tutorial Initial Equipment Connections H Connect power to the WFM 90 or WFM 91 by plugging in the AC power adapter or by installing batteries. H Connect a 75% color bar signal (with setup for NTSC) of the correct standard for your instrument from the television signal generator to the VIDEO IN connector. Verify that the VIDEO IN input switch is set to the 75 W position.
Operation Basics: Tutorial 3. Using the waveform monitor Press the MENU button to enter the Operating menu. The current selection for each monitoring function is highlighted. Pressing the Bezel Button below each function will toggle the highlight bar through the different menu selections. X1/X5 Gain. Press the left Bezel Button and notice that X5 is highlighted and that the waveform is vertically amplified. Use the Y and B buttons to view the entire signal.
Operation Basics: Tutorial Signal Reference. Press the Bezel Button below the menu selection labeled REF. Notice that EXT is highlighted and that EXT REF appears in the on-screen readout. Remove the cable from the EXT REF input and notice that the waveform free-runs and that the message MISSING SYNC appears in the on-screen readout. Return the reference selection to INT. Line Selection. Press the LINE SEL button to enter the Line Select mode.
Operation Basics: Tutorial Use the right two Bezel Buttons to adjust the signal gain to any desired level. Select VAR GAIN OFF and notice that the waveform gain is restored to 100%. Select VAR GAIN ON again and notice that the waveform gain returns to your adjusted setting. Leave the variable gain on and the Configuration menu open, and proceed to the next step. 4. Using the vectorscope Press the VECT button to enter the Vector display mode.
Operation Basics: Tutorial Alternate Phase. This menu selection appears in the WFM 91 only. Select ALT PH ON from the menu and notice that the vector waveform now has a mirrored image. Adjust the vector phase with the Arrow Buttons and notice that the mirrored vectors can be overlaid. Select ALT PH OFF from the menu and return the burst vector back to the 180° graticule line. 5. Using the picture monitor Press the PIX button to enter the Picture display mode.
Operation Basics: Tutorial Return to the Picture display mode and press the right two Bezel Buttons to adjust the picture color to a desired setting. Select PRESETS from the Configuration menu category list and select DEFAULT to reset the picture hue and color back to their proper settings. Select the Picture display mode. Safe Action. This menu selection appears in the WFM 90 only. Press the MENU button to enter the Operating menu.
Operation Basics: Tutorial Location. Press the right Bezel Button a few times and notice that the location of the WIP window rotates around the four corners of the Picture display. Display Mode. The left three Bezel Buttons allow you to change which display mode is shown in the WIP window. 7. Using the audio monitor Connect the output of the audio generator to the AUDIO IN connector on the WFM 90 or WFM 91. Set the generator for a 0 dB tone output. Press the AUDIO button to select the Audio display mode.
Operation Basics: Tutorial Select the Waveform display mode to be displayed in the WIP menu. Use the Y button to position the waveform above the 100 IRE graticule line. Notice that the portion of the signal exceeding the 100 IRE graticule line is highlighted. 9. Using the presets Enter the Configuration menu, select the PRESETS category and then select STORE. Now select DEFAULT from the menu and notice that the instrument returned to the Waveform display mode which is the factory-set default mode.
Operation Basics: Tutorial 2–20 WFM 90 & WFM 91 User Manual
Reference: Using the Menus This section begins with general information on menu operation. Descriptions of each menu selection begin on the following pages: Operating menus page 3–2 Configuration menu page 3–4 Line Select menu page 3–8 General Menu Information Entering and Exiting Menus Pressing the MENU button opens the Operational menu for the currently selected display mode. Pressing the CONFIG button opens the Configuration menu, which is the same for all display modes.
Reference: Using the Menus H When menu selections are made, changes to the display occur immediately. H When the Configuration menu is open, the Y and B buttons are reassigned from their default function to selecting the menu category. The A and " buttons retain their default function for the currently selected display mode. Operating Menus The following pages describe the Operating menus for the different display modes.
Reference: Using the Menus Audio Display Mode Operating Menu REFERENCE dBu. Cycles the Audio reference level through MIC, –10, 0, 4, and 8. The reference levels are measured in dBu, while the MIC level is for testing microphones. HEADROOM. Toggles the headroom reference level between –3 dB and +10 dB. The +10 dB setting is used for viewing signal levels greater than 3 dB over the reference level. Picture Display Mode Operating Menu ACTION. Toggles the Safe Action area markers ON and OFF.
Reference: Using the Menus AUDIO. Selects the Audio display mode to be shown in the WIP window. LOCATION. Cycles the position of the WIP window around the four corners of the Picture display. Configuration Menu The Configuration menu is opened by pressing the CONFIG button. A list of menu categories is displayed above the left Bezel Button, while menu selections within the selected category appear over the right three Bezel Buttons.
Reference: Using the Menus Configuration Menu INPUT Category DC REST. Toggles the DC restorer speed between SLOW and FAST. REF. Toggles the video signal reference between INT (internal) and EXT (external reference input signal). When external reference is selected, EXT REF appears in the on-screen readout of the Waveform and Vector displays. When the WFM 90 or WFM 91 loses its signal reference, MISSING SYNC is displayed in the on-screen readout. Configuration Menu VAR GAIN Category VAR GAIN.
Reference: Using the Menus ALT PH. This menu selection appears on the WFM 91 only. Pressing this Bezel Button toggles the PAL +V mode ON and OFF. When the mode is ON, the phase reference of the –V lines is inverted, and then shown as an overlay on the +V lines to provide a comparison display. Configuration Menu PICTURE Category HUE. This menu selection appears on the WFM 90 only. When HUE is selected, the right two Bezel Buttons adjust the hue of the Picture display.
Reference: Using the Menus Configuration Menu ALARMS Category ALARM. Pressing this Bezel Button toggles the Alarm mode ON and OFF for the Waveform and Vector display modes. Configuration Menu PRESETS Category STORE. Stores the current keypad and menu settings in memory for future recall. RECALL. Resets the keypad and menu settings to match the ones that were last stored in memory. DEFAULT. Resets the front panel and menu settings to their factory-set defaults.
Reference: Using the Menus Line Select Menu The Line Select menu is displayed when the Line Select mode is turned on. The number of the selected line and/or field is displayed in the menu bar over the two right Bezel Buttons. FIELDS. Toggles which video fields are displayed between ALL and 1 OF 2. When 1 OF 2 is selected, the menu selection ALT FIELD appears. ALT FIELD. Toggles the display of the selected line between alternating video fields. This menu selection only appears when 1 OF 2 is selected.
Making Measurements This section contains descriptions of the different graticules provided with the WFM 90 and WFM 91 and methods for using them to perform basics signal measurements. This monitor uses a proprietary rasterizer to display the graticules. The internal graticule scales are on the same plane as the CRT phosphor, eliminating parallax errors.
Reference: Making Measurements Vertical Scales The NTSC graticule is scaled in IRE units and extends from –40 to +120 IRE, in 10 IRE increments. Black level setup is denoted by a dashed line at 7.5 IRE. The PAL (CCIR) graticule is scaled in volts and extends from 0 to 1.2 V, in 0.1 V increments. 100 100% White level 80 60 40 20 7.5 IRE Setup 0 Baseline –20 –40 Sync tip Figure 3–1: NTSC waveform graticule 1.2 1.0 100% White level 0.8 0.6 0.4 Baseline 0.
Reference: Making Measurements Making Waveform Measurements Standard Measurements Standard amplitude and timing measurements of the signal are made by positioning the waveform on the graticule. The magnification controls aid in measuring small portions of the waveform. Peak White With the signal blanking level on the graticule baseline, the amplitude of the 100% white reference of a color bar should be on the 100 IRE (1.0 V PAL) graticule line.
Reference: Making Measurements Red Chrominance gain and phase target boxes R-Y 90_ Magenta Color reference R Q MG Yellow – 3 dB Point YL Burst 180_ Differential gain and phase measurement box B-Y 0_ B Blue G CY 100% and 75% Burst targets –I Green Cyan Figure 3–3: NTSC vector graticule Red Magenta –V Chrominance gain and phase target boxes R +V Chrominance gain and phase target boxes Yellow V 90_ MG – 3 dB Point YL 180_ B Differential gain and phase measurement box Blue G 100%
Reference: Making Measurements Chrominance Vector Targets The chrominance vectors terminate in a system of graticule targets consisting of two boxes (a small box inside a large box). A sample target is shown in Figure 3–5. The dimensions of the large boxes represent 10° centered on the exact chrominance phase, and 20% of chrominance amplitude centered around standard amplitude. The dimensions of the smaller boxes represent 2.5° and 2.5 IRE ( 3° and 5% PAL) of chrominance amplitude.
Reference: Making Measurements Differential Phase and Gain Measurement Box Differential gain (dG) and differential phase (dϕ) measurements use the graticule markings located at the outer edge of the B-Y or U axis 180° line. See Figure 3–6. 10o dφ 2°dφ Figure 3–6: Differential gain and phase measurement box Making Vector Measurements Chroma Bandwidth The horizontal and vertical axes of the vector graticule contain markings for checking chroma bandwidth.
Reference: Making Measurements Audio Graticule The audio graticule does not utilize a horizontal scale since the signal free-runs at a two-field sweep rate. The vertical scales are comprised of the audio reference level and the selected headroom setting mirrored around the baseline. The audio graticule is illustrated in Figure 3–7 with –3 dB headroom selected, and in Figure 3–8 with +10 dB headroom selected.
Reference: Making Measurements Making Audio Measurements Basic audio system measurements such as signal amplitude and frequency response can be made using the audio graticule. Signal Amplitude Signal amplitude is checked by setting the WFM 90 and WFM 91 reference level through the Operating menu to match your system requirements. The amplitude of the signal display should reach the reference level graticule line during normal operation.
Appendix A: Performance Specification The specification tables use the following abbreviations: Performance Requirement (Req). All performance requirements in the specification tables are identified with Req, and can be assured by completing the Performance Check Procedure located in the service manual. Allow a warm-up time of 20 minutes. Performance requirements in the electrical specifications are valid over an ambient temperature range of +20° C to +30° C.
Appendix A: Performance Specification Electrical Specifications A-1. Vertical deflection system CATEGORY Frequency Response DESCRIPTION REF: Specifications apply for full screen height video input signal, with VARIABLE GAIN off. REQ: Flat Filter 1 V Full Scale: 50 kHz to 6 MHz within 2% of response at 50 kHz. REQ: Flat Filter X5 Gain: 50 kHz to 6 MHz within 5% of response at 50 kHz. REF: Low Pass Filter: w40 dB attenuation at 3.58 MHz NTSC, 4.43 MHz PAL.
Appendix A: Performance Specification A-1. Vertical deflection system (Continued) CATEGORY DESCRIPTION Transi REF: Specifications apply for full screen height video input signal, with VARIABLE GAIN off, 1 V Full Scale or X5 Gain selected, and FLAT filter selected. ent Response REF: Pulse-to-Bar Ratio: X1: 0.99:1 to 1.01:1. X5: 0.98:1 to 1.02:1. REF: Preshoot: v1%. REF: Overshoot: X1: v2%. X5: v4%. REF: Ringing: X1: v2%. X5: v4%. REF: Field Rate Tilt: v1%. REF: Line Rate Tilt: v1%.
Appendix A: Performance Specification A-2. DC restoration CATEGORY DC Restorer Clamp Time Frequency Response at 60 Hz (50 Hz PAL) DESCRIPTION REF: Back Porch. REQ: Attenuation of 60 Hz (50 Hz PAL) on Input Signal: Slow Mode: v20%. Fast Mode: w90%. REF: Blanking Level Shift with 10% to 90% APL Change: APL changes from 50% to either 10% or 90% will cause blanking level shift of 1 IRE unit (7.14 mV PAL) or less. REF: Blanking Level Shift Due to Presence or Absence of Burst: 1 IRE unit (7.
Appendix A: Performance Specification A-4. Horizontal deflection system CATEGORY DESCRIPTION Sweep REQ: Sweep will occur in all Horizontal mode settings with or without synchronization. REF: Sweep Length: Two Line and Two Field sweep length is nominally 12 divisions. 1LINE Sweep Repetition Rate REQ: Equal to line-rate of applied video or exter- 2LINE Sweep Repetition Rate REQ: Equal to half line-rate of applied video or nal sync. external sync.
Appendix A: Performance Specification A-5. Vector mode CATEGORY Chrominance Processing Nominal Subcarrier Frequency (FSC) Chrominance Processing Chrominance Bandwidth DESCRIPTION REF: NTSC: 3.579545 MHz. PAL: 4.43361875 MHz. REQ: Upper –3 dB Point: FSC +500 kHz, "100 kHz. Lower –3 dB Point: FSC – 500 kHz, "100 kHz. Chrominance Processing +V Mode (Applicable to PAL operation only) REF: +V-type display as selected by front- Display Vector Phase Accuracy REF: "1.25°.
Appendix A: Performance Specification A-5. Vector mode (Continued) CATEGORY DESCRIPTION Subcarrier Regenerator Phase Shift with Subcarrier Frequency Change REQ: NTSC: "2° from FSC to (FSC + 50 Hz), or FSC to (FSC – 50 Hz). PAL: "2° from FSC to (FSC + 10 Hz), or FSC to (FSC – 10 Hz). Subcarrier Regenerator REQ: "2° from nominal burst amplitude to Phase Shift with Burst Ampli"6 dB. tude Change REF: Internal or External burst reference.
Appendix A: Performance Specification A-6. Synchronization CATEGORY DESCRIPTION Input Requirements REQ: Internal Reference: Composite video or black burst with sync amplitudes 40 IRE (300 mV PAL) "6 dB. REQ: External Reference: Sync amplitude be- tween 143 mV and 4 V will synchronize sweeps. External Reference Input REQ: DC Input Impedance (Unterminated): w15 kW. REF: Return Loss (75 W): w40 dB from 50 kHz to 6 MHz. (With 75 W termination on, instrument power on.
Appendix A: Performance Specification A-8. Environmental characteristics CATEGORY DESCRIPTION Operating Altitude REQ: To 15,000 feet (4572 meters). REF: IEC 1010-1 compliance to 2000 me- ters. Operating Temperature REQ: 0° to +50° C. REF: IEC 1010-1 compliance to +40° C. Equipment Type REQ: Measurement. Installation Category REQ: Installation Category I (as defined in IEC 1010-1, Annex J). REF: Rated for indoor use only. Pollution Degree REQ: Pollution Degree 2 (as defined in IEC 1010-1).
Appendix A: Performance Specification A-9. Power source CATEGORY Battery DESCRIPTION REF: 6 C-sized cell batteries, or Tektronix NiCad battery pack (Tektronix Part No. 146-0107-00). Battery Charge Time REF: Fast Charge: 550 mA. REF: Slow Charge: 150 mA. Power Consumption External Power A–10 REF: Picture Mode: 5.5 Watts Waveform Mode 7.2 Watts Vector Mode 7.2 Watts REQ: DC Source of 11 – 18 Volts.
Appendix A: Performance Specification Table A–1: Certifications and compliances Category Standards or description EC Declaration of Conformity – EMC Meets intent of Directive 89/336/EEC for Electromagnetic Compatibility.
Appendix A: Performance Specification A–12 WFM 90 & WFM 91 User Manual
Appendix B: User Service This section contains instructions for user and preventive maintenance. If the instrument is not functioning properly, it should be referred to qualified service personnel or returned to Tektronix for service. Packaging directions for shipment are on page 1–9. Fuse Replacement The WFM 90 and WFM 91 do not have any user replaceable fuses. Battery Replacement Instructions for installing or replacing the batteries along with battery operation tips are listed starting on page 1–12.
Appendix B: User Service Display Screen The protective screen over the LCD display is susceptible to smudging from dirt and grease. It can be cleaned by spraying a glass-type cleaner onto a lint-free cloth and gently rubbing the display. Only dampen the cloth to prevent moisture from getting behind the protective screen of the display. Interior Interior cleaning and maintenance should be performed by qualified service personnel only.
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