User Manual 1740A/1750A Series Waveform/Vector Monitor 070-8470-06 This document supports firmware version 2.2 and above. www.tektronix.com Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176 - FAX 781.665.0780 - TestEquipmentDepot.
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.
General Safety Summary The common terminal is at ground potential. Do not connect the common terminal to elevated voltages. 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.
General Safety Summary 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.
TABLE OF CONTENTS Introduction Product Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 1-2 Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Power Cord Options . . . . . . . . . . . . . . . . . . . . . . . CRT Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5 1-5 1-6 Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table of Contents Display Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . Vector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Waveform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Audio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SCH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Picture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Time Code . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table of Contents Making Measurements Basic Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1 Waveform Graticule . . . . . . . . . . . . . . . . . . . . . . . Horizontal Scale . . . . . . . . . . . . . . . . . . . . . . . . NTSC Vertical Scales . . . . . . . . . . . . . . . . . . . . PAL Vertical Scale . . . . . . . . . . . . . . . . . . . . . . Dual-Standard Vertical Scale . . . . . . . . . . . . . Making Waveform Measurements . . . . . . . . . . . Horizontal Sync Amplitude . . .
Table of Contents Appendices Appendix A Performance Specifications . . . . . . . . . . . . . . . . . . . . . . A-1 Reliability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1 Electrical Specifications . . . . . . . . . . . . . . . . . A-2 Certifications and compliances . . . . . . . . . . . A-13 viii Appendix B Remote Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1 Remote Connector Converter . . . . . . . . . . . . . . . B-4 Appendix C User Service . . . . . .
Table of Contents LIST OF FIGURES Figure 2-1. Figure 2-2. Figure 2-3. Figure 2-4. Figure 2-5. Figure 2-6. Figure 2-7. Figure 2-8. Figure 2-9. Figure 2-10. Figure 2-11. Figure 2-12. Figure 2-13. Figure 2-14. Figure 2-15. Figure 2-16. Figure 2-17. Figure 2-18. Multi-Use Bezel Controls and Buttons. . . . . . . . . 1740A Front Panel. . . . . . . . . . . . . . . . . . . . . . . 1750A Front Panel. . . . . . . . . . . . . . . . . . . . . . . 1740A/ 1750A-- Series Rear Panel. . . . . . . . . . . .
Table of Contents x Figure 4-12. Two-Field SC/H R-- Y display (PAL). . . . . . . . . . . Figure 4-13. Audio displays. . . . . . . . . . . . . . . . . . . . . . . . . . 4-14 4-15 Figure B-1. Rear panel REMOTE connector. . . . . . . . . . . . . Figure B-2. REMOTE adapter. . . . . . . . . . . . . . . . . . . . . . . . Figure B-3. Rear panel RS232 connector. . . . . . . . . . . . . . . . B-1 B-4 B-5 Figure C-1. Graticule light replacement. . . . . . . . . . . . . . . . .
Preface This user manual is one of a set of two manuals that document the Tektronix 1740A/1750A-Series Waveform/Vector monitors. To purchase a service manual, please refer to “Contacting Tektronix” on Page xiv for address and phone number information. User Manual Instrument controls and readouts appear in ALL CAPITALS.
Preface Service Manual Topics covered in the service manual are as follows: Specifications Operating Information Theory of Operation Performance Verification Adjustment Procedures Maintenance Options Electrical Parts List Diagrams Mechanical Parts List xii 1740A/1750A Series Waveform/Vector Monitor User Manual
Preface 1750A Waveform / Vector Monitor.
Introduction
Product Description The 1740A/ 1750A-- Series are combination waveform/vector monitors in half-rack size packages. The 1740A-- Series provides all basic waveform monitor and vectorscope functions; the 1750A-- Series provides the same functions with SCH measurement capabilities added.
Product Description Features H Composite or Component Waveform Monitoring H Composite Vector Display H Menu-Assisted Operation allows expanded feature set. H Assignable cursors for time and voltage. H Picture monitor mode for verifying signal source H Stereo Audio Display H Longitudinal time code display mode for editing applications H SCH and Color Framing Display (1750A-- Series only) H External staircase from a camera control unit can be selected remotely.
Product Description mable and 1 is factory-programmed. The FILTER menu also provides a choice of four filters in addition to flat. Two combination filtering modes can be displayed in OVERLAY or PARADE. Refer to “Using the Menus” on page 3-5 for more menu information. CRT The monitors have a bright, post-accelerated CRT with lighted internal graticule. The parallax-free internal graticule structure contains targets and markings for both the vector and waveform functions.
Product Description 1-4 1740A/1750A Series Waveform/Vector Monitor User Manual
Options White phosphor CRT and power cord options are the only options currently available for the 1740A/ 1750A-- Series. Field upgrade kits listed in this section can also be used with these monitors. Power Cord Options Any of the following power cord options can be ordered for the 1740A/ 1750A-- Series. If no power cord option is specified, instruments are shipped with a North American 125 V power cord and one replacement fuse.
Options CRT Options The standard instrument is shipped with a P31 (green) phosphor CRT installed. If Option 74 is ordered, the instrument is shipped with a P4 (white) phosphor CRT installed. The Option 74 CRT part numbers are given in the service manual, at the end of the Replaceable Electrical Parts List.
Accessories Standard Accessories These accessories are included with the product: 1 Manual, user: 1740A/ 1750A-- Series (070-- 8470-- XX) 1 Cable assembly, power: United States and Japan only (161-- 0216-- XX) 1 Cable assembly, power: all other countries (161-- 0066-- XX) 1 Fuse, cartridge: 3AG, 2A, 250V, fast-blow (159-- 0021-- 00) 4 Light bulbs: graticule scale (150-- 0168-- 00). See page C-1 for replacement instructions. 4 Air filters: fan (378-- 0335-- 00).
Accessories Field Upgrade Kits 1700F00 Plain Cabinet — This plain metal half-rack size cabinet is painted silver-gray. Ventilating holes in top, bottom, and sides of the cabinet allow heat generated within the instrument to dissipate. 1700F02 Carrying Case — This portable cabinet is similar to the 1700F00, but has feet, carrying handle, flipstand, and front cover. 1700F05 Side-by-Side Rack Adapter — The 1700F05 allows the user to mount two half-rack width instruments in a standard 19-- inch rack.
Installation Unpacking 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. Accessories Check that the following accessory items are included: H User Manual H Service Manual Note: The Service Manual is an optional accessory that must be ordered to be received.
Installation cushioning on all sides of the instrument. 3. Seal the carton with shipping tape, industrial stapler, or both. Electrical Installation Power Source These monitors are designed to operate from a single-phase power source having one of its current-carrying conductors at or near earth ground (the neutral conductor). Only the line conductor is fused for over-current protection.
Installation WARNING Mains Frequency and Voltage Range The 1740A/ 1750A-- Series monitors operate at 50 and 60 Hz, over the range of 90-- 250 Volts, without operator adjustment. Remote Connector The rear-panel REMOTE connector is a 25-pin, D-type connector. It provides the input for RGB/YRGB staircase, external horizontal, and remote sync. It also accepts the input signals for external blanking, time code, stereo L and R audio.
Installation Mechanical Installation All qualification testing was performed with a Tektronix 1700F00 cabinet installed. To guarantee compliance with specifications, the instrument should be operated in a cabinet or rackmount adapter. The Tektronix 1700F00, 1700F02, and 1700F05 provide the proper electrical environment for the instrument, supply adequate shielding, minimize handling damage, and reduce dust collection within the instrument.
Installation Rackmounting The 1740A/ 1750A-- Series monitors are half-rack width and three rack units high. They require approximately three inches of rear clearance for power cord and cable connections, and 20 inches in front of a rack for installation and removal of the instrument. The optional 1700F05 rack adapter allows two Tektronix half-rack instruments to be mounted side-by-side in a rack. It is adjustable so that the instrument can be closely aligned with other equipment in the rack.
Instrument Configuration Focus, scale illumination, signal intensity, readout intensity, and trace rotation are set through the CRT menu. Several instrument operating parameters can be set through the CONFIG menu. Instructions for using these menus begin on page 3-18.
Getting Started Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176 - FAX 781.665.0780 - TestEquipmentDepot.
AT A GLANCE Front-Panel Controls The following is an overview of front-panel controls. Figure 2-2 shows the 1740A front panel and Figure 2-3 shows the 1750A front panel. Controls---Switches---LEDs H All front-panel controls are the continuous action type, and all front-panel buttons are push-and-release toggle switches. H Green LEDs light to indicate the current switch selection. POWER H ON/STANDBY turns the instrument on or to standby status. An LED indicates when power is on.
At A Glance H Turn off instrument power. H Depress and hold the CLEAR MENU and WAVEFORM buttons while you turn instrument power on again. Hold both buttons in until the instrument returns to its normal operating state. H If this reset does not unlock the controls, contact your Tektronix field office or call Tektronix at the phone number listed in the front of this manual.
VERT POS HORIZ POS CLEAR MENU 1740A/1750A Series Waveform/Vector Monitor User Manual OVERLAY PARADE A 123 B 123 CH-B3 CH-A3 CH-B2 CH-A2 CH-B1 CH-A1 CH-B INPUT CH-A MULTIPLE EXT REF RESTORE DC REST MAG FIELD ON/ STANDBY POWER CRT GAIN CONFIG PRESET LIN SEL CURSOR FILTER MENU SWEEP LINE TIME CODE PICTURE WAVEFORM WAVEFORM / VECTOR MONITOR AUDIO VECTOR DISPLAY 1740A At A Glance Figure 2-2. 1740A Front Panel.
2-4 VERT POS HORIZ POS CLEAR MENU OVERLAY PARADE A 123 B 123 CH-B3 CH-A3 CH-B2 CH-A2 CH-B1 CH-A1 CH-B INPUT CH-A MULTIPLE EXT REF RESTORE DC REST MAG FIELD ON/ STANDBY POWER CRT GAIN CONFIG PRESET LIN SEL CURSOR FILTER MENU SWEEP LINE TIME CODE PICTURE WAVEFORM WAVEFORM / VECTOR MONITOR SCH AUDIO VECTOR DISPLAY 1750A At A Glance Figure 2-3. 1750A Front Panel.
At A Glance POSITION H VERT POS allows the signal display to be moved vertically. Offsets for channels A2/A3 and B2/B3 are enabled through the CONFIGURE menu. DISPLAY H provides voltage vs. time display of the video signal. H VECTOR H AUDIO H SCH H PICTURE WAVEFORM presents an XY plot of demodulated chrominance phase and amplitude. amplitude and phase is monitored using a calibrated X/Y Lissajous display. provides a vector display of the subcarrier-tohorizontal-sync phase relationship.
At A Glance REF H toggles between external reference (EXT LED on) and internal reference. Internal reference can be configured for component operation, and two external reference inputs can be designated for dual-standard instruments. See the CONFIGURE men on page 3-18. EXT INPUT H Selecting a front-panel input causes the signal that is input to the corresponding rear-panel connector to be displayed on screen. H Without PARADE or OVERLAY selected, only one input selection can be made at a time.
At A Glance OVERLAY OVERLAY provides an overlaid display of all se- lected inputs. MENU Push the desired menu button to enter that menu and enable the associated functions. Push the button again to exit the menu and disable the function. Refer to page 3-5 for more information about using menus. H allows choice of flat or filtered display of the waveform signal. H CURSOR H LIN SEL allows the selection of a single line or group of lines for display.
At A Glance Rear-Panel Connectors The following is an overview of rear-panel connectors. Figure 2-4 shows the 1750A rear panel. Loop-Through Inputs H INPUTs A, A1, A2, A3, B, B1, B2, H EXT REF and B3 are passive loop-through video inputs, compensated for 75 Ω. The front-panel INPUT switch settings determine which channel(s) are displayed. The eight inputs can be configured for composite or component video signals. is a 75 Ω compensated loop-through synchronization input.
At A Glance Fuse H The instrument’s mains fuse should be replaced only with a 250V, 2A, F-type cartridge fuse. A replacement fuse is included with the instrument. AC Power H The AC POWER plug is a standard ac plug receptacle for 120 or 240 Vac power mains. The plug is compatible with any of the power cord options available with the 1740A/1750A-- Series. Fan Filter H Four replacement air filters for the fan are included with the instrument. Refer to page C-1 for replacement and cleaning instructions.
2-10 110 VA MAX 90 --- 250V 50/60 HZ REPLACE FUSE WITH 250V 2A F TYPE 5 9 RS232 6 1 TO AVOID ELECTRICAL SHOCK, THE POWER CORD PROTECTIVE GROUNDING CONDUCTOR MUST BE CONNECTED TO EARTH GROUND. WARNING EXT REF PIX OUT 13 25 B3 A3 REMOTE B2 A2 ! 14 1 B1 A1 75 OHM LOOP--THROUGH COMPENSATED B A DIE IN DIESEM GERAT ENTSTEHENDE ROHTGENSTRAHLUNG IST AUSREICHEND ABGESCHIRMT. BESCHLEUNIGUNGSPANNUNG KLEINER ALS 20KV. At A Glance Figure 2-4. 1740A/1750A ---Series Rear Panel.
Operator’s Checkout Procedure Before proceeding, read At A Glance starting on page 2-1. This procedure is designed for operator familiarization and for checking basic instrument operation (not measurement quantities or specifications). All illustrations are of the 1750A unless otherwise noted. If performing this procedure reveals improper instrument operation, first check the operation of the associated equipment.
Operator’s Checkout Procedure H Connect the generator NTSC output (COMPOSITE for TSG131) to the CH-A input. Connect the CH-A loopthrough to the EXT REF input and connect a 75Ω terminator to the EXT REF loop-through. See Figure 2-5. R-Y B-Y NTSC Y Y NTSC TSG 130 A3 A2 A1 A B3 B2 B1 B EXT REF 1750A Figure 2-5. Equipment hook-up for Operator’s Checkout Procedure. Procedure 1. Initialize the Front-Panel Controls Enter the PRESET menu and select FACTORY.
Operator’s Checkout Procedure Enter the CRT menu. DISPLAY will be outlined. Adjust the bezel controls for optimum focus, graticule scale illumination, and signal intensity. Select READOUT and adjust the right bezel control for desired readout intensity. Select TRACE and adjust the center bezel control for a level trace. Exit the CRT menu. The changes made while in the menu remain in effect. 3. Input Channel Selection Press the EXT and PARADE buttons.
Operator’s Checkout Procedure 10 S/DIV Figure 2-6. Calibrator display. 5. Gain Control There are three calibrated vertical gain settings available (X1, X5, and X10), as well as an independent variable gain control. Enter the GAIN menu and select X5. Note that X5 is outlined and the display is amplified. Select X10. Note that X10 is outlined and the display is amplified again. Select variable gain and use the right bezel control to adjust the gain to the minimum and maximum settings.
Operator’s Checkout Procedure Press the MAG button. The MAG indicator lights and a 1 S/Div sweep is displayed. Use the HORIZ POS control to view the magnified display, then turn off the MAG. (See page 3-4 for a list of sweep rates.) 7. Voltage and Timing Cursors The 1740A/1750A-- Series voltage, timing, and vector cursors can be used to measure any portion of the displayed signal. Enter the CURSOR menu (factory preset selects voltage cursors; VOLT is outlined on screen).
Operator’s Checkout Procedure control to move the cursor away from graticule center, and the center bezel control to move the cursor around the graticule center point. Note that the amplitude and phase of the cursor are displayed on screen. Select MARK and set QUANTITY to 2. Move the marker by rotating the AMPLITUDE knob. Note that the two graticule markers appear as small numbered boxes. Set CONTROL to 1 and use the left bezel control to move marker 1 away from the graticule center.
Operator’s Checkout Procedure 10 S/DIV FLAT LUM CHROM DIFF R-- Y SCH R-- Y F+L F+L+C Figure 2-7. Two-Line LUM filter display of color bar signal. 10 S/DIV FLAT LUM CHROM DIFF R-- Y SCH R-- Y F+L F+L+C Figure 2-8. Two-Line CHROM filter display of color bar signal.
Operator’s Checkout Procedure Select F+L+C (FLAT plus LUM plus CHROM). The display is similar to the F+L display, with the chrominance-filtered signal added on the right. Select DIFF. Select the generator 5-step staircase signal. The differentiated-step filtered display appears similar to Figure 2-9. Select R---Y. This provides a demodulated chrominance-versus-time display. Use the right bezel control to adjust vector phase. See Figure 2-10. Select SCH R---Y (1750A only).
Operator’s Checkout Procedure FLAT LUM CHROM DIFF R-- Y SCH R-- Y F+L F+L+C VECTOR PHASE Figure 2-10. Two-Line R ---Y display of color bar signal. FLAT LUM CHROM DIFF R-- Y SCH R-- Y F+L F+L+C VECTOR PHASE Figure 2-11. Two-Field SC/H R ---Y display (NTSC), showing proper SCH phase.
Operator’s Checkout Procedure FLAT LUM CHROM DIFF R-- Y SCH R-- Y F+L F+L+C VECTOR PHASE Figure 2-12. Two-Field SC/H R ---Y display (PAL), showing proper SCH phase. 9. Line Selection Line select is available in the following display modes: WAVEFORM, VECTOR, SCH (1750A-- Series only), and PICTURE. Enter the LINE SELECT menu and turn the center bezel control until the readout displays ALL 131. In a two line display, line 131 appears on the left, followed by line 132.
Operator’s Checkout Procedure ALL131 - - 145 FIELD ALL 1OF2 1OF4 1OF8 1H 15H LINE SEL Figure 2-13. Line Select display with 15H selected, in 2 FIELD sweep. Select 1 of2. Now only the first field has intensified lines, and a NEXT FIELD selection appears. Select NEXT FIELD and note that the intensified lines now appear only in the second field and the readout is F2 131 F2 145. Select MULTIPLE with WAVEFORM, VECTOR, and SCH (1750A-Series only). Note that the displays appear in the order listed here.
Operator’s Checkout Procedure VECTOR PHASE Figure 2-14. Vectorscope color bar display. Figure 2-15. Picture mode display of color bar signal.
Operator’s Checkout Procedure 12. Audio Display To obtain an audio display, connect the left and right audio signals to the rear-panel REMOTE connector as follows: +Y to pin 8, - Y to pin 9, +X to pin 10, and - X to pin 11. Select AUDIO display mode. An audio signal with no phase error appears as a straight line extending from the audio box in the upper right corner of the graticule to the box in the lower left. A signal with phase error appears as an opening in a lissajous waveform. See Figure 2-16. 13.
Operator’s Checkout Procedure VECTOR PHASE Figure 2-17. NTSC SC/H display with internal reference selected. VECTOR PHASE Figure 2-18. PAL SC/H display. This concludes the Operator’s Checkout Procedure.
Operation Basics
Functional Overview The “Functional Overview” section describes the front- and rear-panel functions in greater detail than the “At A Glance” section. Display Modes The following display types are available: H VECTOR H WAVEFORM H AUDIO H SCH H PICTURE H TIME CODE H MULTIPLE (1750A-- Series only) displays Vector The vector mode presents an XY plot of demodulated chrominance phase and amplitude.
Functional Overview can be activated and positioned for reference or measurement. LINE SELECT is discussed on page 3-14 and CURSORS are discussed on page 3-8. Audio Audio amplitude and phase is monitored using a calibrated X/Y Lissajous display. The operator can verify that the program audio will be properly reproduced on both monaural and stereo receivers. Correct phasing between two audio channels is quickly verified by the direction of the display.
Functional Overview Time Code Longitudinal time code is monitored in a frame-rate display to allow observation of amplitude, synchronization, and phase with respect to reference vertical sync. Synchronization is confirmed by the stationary display and time code phase is determined by horizontal position of the time code sync word on the CRT. Multiple When MULTIPLE is pushed, any combination of front-panel DISPLAY modes can be selected at the same time, with the exception of TIME CODE and PICTURE displays.
Functional Overview Inputs A1, A2, A3, and B1, B2, B3 are designed to be used as three-wire inputs for component signals. A123 / B123 Selecting A123 provides a side-by-side display of the CH-A1, CH-A2, and CH-A3 inputs (B123 displays the CH-B1, CH-B2, and CH-B3 inputs). This is designed for monitoring component signals. Parade Selecting PARADE displays the input channels last selected for PARADE, allowing a custom configuration of inputs.
Using the Menus General menu information here is followed by detailed information about each menu: FILTER, CURSOR, LIN SEL, PRESET, CONFIG, GAIN and CRT. To set instrument operating parameters, see CONFIG and CRT menu information. General Menu Information Push the desired menu button to obtain an on-screen menu readout. Multi-Use Bezel Controls and Buttons Menu selections appear along the right side of the screen. Descriptive labels, when present, appear in ITALIC text.
Using the Menus CRT, PRESET, and CONFIG menus will be exited completely when another menu button is pushed. DISPLAY READOUT TRACE Bezel Buttons TEST ON OFF FOCUS SCALE INTENSITY VERTPOS HORIZPOS CLEAR MENU Left Center Right Bezel Controls Figure 3-1. The CRT menu, showing bezel controls and bezel buttons. Clear Menu Push CLEAR MENU to clear part of the menu display, but leave essential readout elements such as control assignments and measurement readouts.
Using the Menus menu function is still in effect (LED is lighted), push the menu button to bring back the full display, then push it again to exit the menu. Filter Menu (WAVEFORM Mode Only) The FILTER menu is available for WAVEFORM mode only. Note that the instrument must be in WAVEFORM mode to access the R-- Y displays. When the FILTER button is pushed in WAVEFORM mode, an on-screen menu allows the following selections. The bezel buttons are self-cancelling. H FLAT — provides flat (normal) response.
Using the Menus H F + L + C — displays the video signal flat, lumi- nance filtered, and chrominance filtered. The signal is displayed in parade or overlay mode, as selected through the on-screen menu. When PARADE is selected, the flat display is on the left, with the chrominance-filtered display on the right. Cursor Menu Press the CURSOR menu button to enter the cursor menu. Cursors are available for VECTOR, WAVEFORM, and VECT+WFM DISPLAY modes.
Using the Menus AMPL 75.0IRE PHASE 145.0° VEC CURSOR POLAR MARK AMPLITUDE PHASE VECTOR PHASE VERTPOS HORIZPOS CLEAR MENU Left Figure 3-2. Center Right The VECTOR CURSOR menu. Waveform Cursor Control In WAVEFORM display mode, the bezel buttons are used to select timing cursors (TIME), voltage cursors (VOLT), both voltage and timing (V+T), or markers (MARK). The Waveform cursor menu is shown in Figure 3-3.
Using the Menus H When timing cursors are selected (TIME), the left bezel control is used to adjust the horizontal position of the first timing cursor, and the center control adjusts the horizontal position of the second timing cursor. The right bezel control moves both cursors horizontally, in tandem. The readout ∆T shows the time difference (positive or negative) between the two cursor positions, up to four significant digits.
Using the Menus Voltage Cursor 1 ∆V 700 mV WFM CURSOR VOLT TIME MARK Voltage Cursor 2 V+T VEC CURSOR POLAR MARK Timing Cursor 1 Timing Cursor 2 VOLT1 VOLT2 TRACK VERTPOS CONTROL VOLT TIME HORIZPOS CLEAR MENU Figure 3-4. The VECTOR+WFM CURSOR menu with V+T selected. Vector + Waveform (Multiple) If MULTIPLE is pressed and both VECTOR and WAVEFORM displays are selected, menus for all cursor types will be displayed. See Figure 3-4.
Using the Menus There are two vector cursor displays: POLAR and MARK. (The VECTOR PHASE bezel control continues to adjust the phase of the signal.) Polar Cursors can be used to measure the amplitude and phase of the chrominance signal. When POLAR is selected, position the cursor (cross hairs) with the AMPLITUDE and PHASE bezel controls, and view the amplitude and phase readouts at the top of the screen. See Figure 3-2. The cursor zero amplitude point is the center point of the graticule.
Using the Menus If it becomes necessary to compensate for minor shifting of markers due to drift or external magnetic fields (particularly if the instrument is moved after the markers are set), enter the CRT menu and select READOUT. Use the bezel controls to adjust vertical position (VPOS) and horizontal position (HPOS) until the center of the displayed test pattern is at the center of the graticule. With Waveform Display Voltage Cursors can be used to make accurate signal amplitude measurements.
Using the Menus Line Select Menu Pushing the LIN SEL menu button enables the line select mode and provides the line select menu display. The middle bezel control is assigned to select the line number. The following choices can be made using the bezel buttons. 1740A-- Series — ALL or 1of 2 H FIELD H 1H or 15H (one line or 15 lines) H NEXT FIELD — (appears only when 1of 2 FIELD is selected.
Using the Menus When bezel buttons corresponding to NEXT FIELD, ALT 2 FIELD, or ALT 4 FIELD are pushed, a box flashes momentarily around the on-screen label to verify that the selection has been made. Readout The line select readout (in the upper left of the CRT) consists of field followed by line number. When 15H is selected, the readout also displays the range of line numbers. For example, select FIELD 1 and 15H, and rotate the LINE SEL control to line 34.
Using the Menus Preset Menu The 1740A/ 1750A-- Series has 10 presets capable of storing front-panel setups. Nine of the presets are user-programmable and one is factory pre-programmed. The factory programmed setup is as follows: WAVEFORM, CH-A, DC REST ON, 2LINE SWEEP, REF internal, and menus off. Factory-programmed setup: WAVEFORM DISPLAY, CH-A INPUT, DC REST ON, 10 µs SWEEP, REF internal, and menus off. Push the PRESET menu button to access the on-screen menu, illustrated in Figure 3-5.
Using the Menus Recall Use the left bezel control to select (outline) a preset for recall. Push RECALL to recall the stored instrument configuration. Recover Push RECOVER to restore the front-panel setup that was in effect before RECALL was pushed. Store To begin storing a setup, push STORE. Make sure the frontpanel controls are set as desired, and use the left bezel control to select the storage location (shown outlined).
Using the Menus Configure Menu Push the CONFIG button to display the configure menu, shown in Figure 3-6. Turn the left bezel control to select INPUT, VECTOR, FORMAT, STANDARD, OFFSET, CALIBRATE, REMOTE, or REFERENCE (a box appears around the selection). Following are descriptions of each selection. INPUT — Selects AC or DC coupling for rear-panel inputs. H COUPLING H DC RESTORER — Selects the clamp speed. Slow will clamp while displaying any hum.
Using the Menus COUPLING AC DC DCRESTORER SLOW FAST Bezel Buttons CLAMP ST BP INPUT VECTOR FORMAT STANDARD OFFSET CALIBRATE REMOTE REFERENCE A123 COMPOSITE COMPONENT B123 COMPOSITE COMPONENT VERTPOS HORIZPOS CLEAR MENU Left Figure 3-6. Center Right The CONFIGURE menu display with INPUT selected. FORMAT H CONFIG—FORMAT is used to to select the configura- tion of signals used for interconnection of equipment. Available signal formats are: GBR, SMPTE/EBU, BETA, and MII.
Using the Menus Table 3-1. FORMAT 525/60 GBR SMPTE / EBU BETA MII 625/50 GBR SMPTE / EBU BETA MII [1] [2] [3] [3] Valid FORMAT selections. BARS [1] SETUP [2] 75% 100% Y N 75% 100% Y N • • • • • • • • • • • • • • • • • • • • • • • • • 75% or 100% Bars selected through CONFIG—VECTOR menu. Setup Yes or No is selected through the CONFIG—VECTOR menu. The setup selection is only relevant with 525/60 BETA, and is ignored in all other formats. MII is identical to SMPTE/EBU in 625/50.
Using the Menus OFFSET H The VERTICAL POSITION control normally positions all channels together. When OFFSET is enabled, the bezel controls can be used to offset input channels 2 (A or B) and 3 (A or B) with respect to channel 1 (A or B). H While the offsets are enabled, the VERTICAL POSITION control will still position all channels together, with the offset amount remaining constant. When OFFSET is turned off, the input channels will be re-aligned.
Using the Menus Additional choices appear when CAL SIG or GAIN CAL is turned on: CAL SIG ON H In waveform mode, the user can set the calibrator frequency to 100 KHZ or to FSC OSC (FSC OSC = 3.58 MHz for NTSC/4.43 MHz for PAL). Dual-standard monitors also have the option of choosing NTSC FSC (3.58 MHz) or PAL FSC (4.43 MHz). H In vector mode, the user can set the calibrator frequency, for dual-standard instruments only, to NTSC FSC (3.58 MHz) or PAL FSC (4.43 MHz).
Using the Menus REMOTE H The currently operating software version is displayed in the lower right corner of the screen. H Three menu choices are available. REM INPUT configures rear-panel REMOTE connector pin 3 to accept External Horizontal or Staircase input. STAIRCASE configures the staircase input for 3-step (RGB) or 4-step (YRGB) signal. BAUD configures the data transmission rate for the rear-panel RS232 connector for 1200, 4800, or 9600 baud.
Using the Menus Gain Menu H Any one of three calibrated gain ratios can be selected: X1, X5, or X10. Variable gain is also available, independent of the other gain settings. When variable gain is on, the left bezel control adjusts the signal gain. H Audio or Time Code gain is set from the GAIN menu when AUDIO or TIME CODE display is selected. Gain choices are 0 dBu, 4 dBu, 8 dBu, or 12 dBu. Select gain relative to the system under test.
Remote Operation The 25-pin rear-panel REMOTE connector is a subminiature D-type connector. It accepts the input for RGB/YRGB staircase, external horizontal, remote sync external blanking, time code, and Left and Right audio. TTL signal or ground closure to designated pins will enable Staircase, External Horizontal, or Remote Sync displays. When Remote Sync is enabled, the on-screen TIME/DIV. readout is not present.
Making Measurements
Basic Measurements Basic Measurements contains 1740A/1750A-- Series graticule descriptions, followed by specific measurement procedures. This monitor uses an internal graticule, which combines waveform and vector markings. The internal graticule scales are on the same plane as the CRT phosphor, eliminating parallax errors. Graticule illumination can be adjusted through the CRT menu (page 3-24) to provide optimum brightness for viewing or photographing displays.
Basic Measurements NTSC Vertical Scales The NTSC graticule is shown in Figure 4-1. The left side of the graticule is scaled in IRE units and extends from - 50 to +120 IRE in 10 IRE increments. A mV scale has been added to the right side of the NTSC graticule to facilitate component measurements. Black level setup is denoted by a dashed line at 7.5 IRE. There are ± 2 IRE and ± 4 IRE markings at the center of the - 40 IRE line to assist in measuring sync amplitude.
Basic Measurements PAL Vertical Scale The PAL graticule is shown in Figure 4-2. On the left side of the PAL graticule is a voltage scale that extends from 0 to 1.2 V. The graticules are also marked for K-- Factor tolerances and linear-distortion measurements. These measurements will be described later in this section. Component signals can be centered on the .35 V line. K Factor Audio 100% White Level Baseline Sync Tip Figure 4-2. PAL waveform/vector graticule.
Basic Measurements Dual-Standard Vertical Scale The dual-standard graticule combines the NTSC and PAL scales. The NTSC scale is on the left side; the PAL scale is on the right. The divisions represent 10 IRE in amplitude (70 mV for PAL). The instrument gain is automatically adjusted for the particular standard used. On-screen arrows point to the graticule scale (left side or right side) that is calibrated for the present operating mode.
Basic Measurements Making Waveform Measurements Horizontal Sync Amplitude The vertical scale at sync tip (40 IRE NTSC or - 0.3 V PAL) provides ±2 and ±4 IRE (±2 and ±4 mV) for measuring sync amplitude. Align the blanking level of a centered two-line waveform display on the graticule baseline to place the sync pulse directly over this structure. Measure sync amplitude directly from the graticule, or use the voltage cursors.
Basic Measurements To measure the K-- Factor line-time distortion, measure the largest deviation of the bar top (tilt or rounding) within the structure. The solid outer box equals a 4% K-- Factor, while the dashed line inner box equals a 2% K-- Factor. For signals with a bar half-amplitude duration that exceeds 18 s (8 s PAL), measure the bar top in increments by positioning the bar to the left or right of the leading or trailing edge. The first and last 1 s of the bar should be disregarded.
Basic Measurements Vector Graticule The VECTOR display permits measurements of hue in terms of the relative phase of the chrominance signal with respect to the color burst. Relative amplitude of chrominance to burst is expressed in terms of the displacement from center (radial dimension of amplitude). The vector graticule is combined with the waveform graticule.
Basic Measurements R ° ° ° ° ° ° ° ° Figure 4-4. Vector targets --- NTSC values (PAL values in parentheses). PAL For the 1741A and 1751A graticule, each PAL chrominance vector related to the +V burst terminates in targets consisting of two boxes (a small box inside a large box). See Figure 4-4. The large box represents ±10° centered on the exact chrominance phase and ±20% of chrominance amplitude centered around 100% standard amplitude.
Basic Measurements Making Vector Measurements Chroma Bandwidth The horizontal and vertical axes of the vector graticule contain markings for checking chroma bandwidth. A subcarrier frequency sine wave (whose amplitude places it on the outer compass rose) is used as a reference. When the frequency is changed, the diameter of the circle should reduce. At a point equal to 70% of full amplitude (-- 3 dB), there are gaps in the horizontal and vertical axes.
Basic Measurements Making SC/H Phase Measurements (1750A---Series Only) The SC/H display provides a vector display of the subcarrierto-horizontal-sync phase relationship. The burst vector and the phase of the 50% point of the leading edge of sync are displayed. NTSC Dual-Dot Display When REF is set to internal, the 1750A has a dual-dot SC/H display (Figure 4-6). The dots represent the 50% points of horizontal sync. To make a measurement, align the burst vector as shown in Figure 4-6.
Basic Measurements Sync Dot Burst Vector 0° Axis Sync Dot Relative angle indicates degree of SC/H phase. VECTOR PHASE Figure 4-6. NTSC dual-dot SC/H display. Burst Vector 0° Axis Sync Dot VECTOR PHASE Figure 4-7. NTSC single-dot SC/H display.
Basic Measurements PAL The 1751A uses a series of dots around the compass rose with a single dot in a blanked area to denote sync (see Figure 4-8). Place the burst vector at 0°, align the burst vectors with the graticule markings, and read the SC/H phase error as the amount of sync dot offset from the the horizontal axis. The input signal and the the EXT REF signal are properly color framed when the sync dot is within 90° of the burst vector. VECTOR PHASE Figure 4-8. PAL SC/H display.
Basic Measurements FLAT LUM CHROM DIFF R-- Y SCH R-- Y F+L F+L+C Burst Horizontal Sync VECTOR PHASE Figure 4-9. Two-Line SC/H R ---Y display (NTSC), with proper SC/H phase. FLAT LUM CHROM DIFF R-- Y SCH R-- Y F+L F+L+C VECTOR PHASE Figure 4-10. Two-Field SC/H R ---Y display (NTSC), showing proper SC/H phase.
Basic Measurements VECTOR PHASE Figure 4-11. Two-Field SC/H R ---Y display (NTSC), showing approximate 10° phase error. FLAT LUM CHROM DIFF R-- Y SCH R-- Y F+L F+L+C VECTOR PHASE Figure 4-12. Two-Field SC/H R ---Y display (PAL), showing proper SC/H phase.
Basic Measurements Making Audio Measurements An audio signal with no phase error appears as a straight line extending from the audio box in the upper right corner of the graticule to the box in the lower left. A signal with phase error appears as an opening in a Lissajous waveform. Figure 4-13 shows three audio input signals that are equal in amplitude, but have different phase relationships. Audio gain is set from the GAIN menu when AUDIO display is selected.
Basic Measurements Time Code Display Linear Time Code, also known as Longitudinal Time Code (LTC), is an 80-bit signal with information which makes it possible to accurately identify an individual frame of recorded video. LTC is typically recorded on an unused audio track. The 1740A/1750A-- Series monitor provides a voltageversus-time display of the Time Code waveform, which can be used to check for the following problems: H No signal.
Calibration Instrument gain may require readjustment for special monitoring applications. To prevent erroneous measurements, gain should be adjusted only by qualified personnel. Normal instrument calibration, performance verification, and service maintenance are covered in the service manual, which will be published as a separate volume. Adjusting Instrument Gain Instrument gain can be adjusted through the CONFIG—CALIBRATE menu. CONFIG menu is described on page 3-18. Set Vertical Gain 1.
Calibration Set Horizontal Gain 1. To set horizontal gain, push the CONFIG menu button. Select CALIBRATE, then CAL SIG ON and 100 KHZ. Select GAIN CAL ON. a. In 1 LINE SWEEP, adjust the HORIZ CAL control for one-half cycle per major graticule division; in 2 LINE SWEEP, adjust for one full cycle per major division. b. Pushing RESET HCAL will cancel any gain adjustment and reinstate the factory gain setting. Set Vector Gain 1.
Appendices Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176 - FAX 781.665.0780 - TestEquipmentDepot.
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 (1740A/ 1750A/1760-- Series 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 Table A- 1: Waveform Vertical Deflection CATEGORY DESCRIPTION Deflection Factor Req: 1 V full scale (X1): 1 volt input displayed with- in 1% of 140 IRE (1.00 V PAL) X5 Gain: 0.2 volt input displayed within 1% of 140 IRE (1.00 V PAL) X10 Gain: 0.1 volt input displayed within 1% of 140 IRE (1.00 V PAL) RI: Any one of the 8 inputs Variable Gain Range Req: 0.2X to 1.
Appendix A: Performance Specification Table A- 1: Waveform Vertical Deflection (Cont.) CATEGORY Video Input Crosstalk Between Channels Frequency Response (Flat) DESCRIPTION RI: Req: ±2% to 10 MHz (X1 Gain) ±4% to 10 MHz (X5 and X10 Gain), on screen signal (0.2 V or 0.
Appendix A: Performance Specification Table A- 1: Waveform Vertical Deflection (Cont.) CATEGORY DESCRIPTION Transient Response Req: Pulse-to-Bar Ratio 0.99:1 to 1.
Appendix A: Performance Specification Table A- 1: Waveform Vertical Deflection (Cont.) CATEGORY DESCRIPTION Blanking Shift with Presence and Absence of Burst Req: ≤1 IRE (7 mV PAL) RI: Typically 3 mV Table A- 2: External Reference CATEGORY DESCRIPTION Input RI: Composite video or black burst Maximum Operating Input Voltage RI: --1.8 V to +2.2 V, dc + peak ac Absolute Maximum Input Voltage RI: --8.5 V to +8.
Appendix A: Performance Specification Table A- 3: Waveform Horizontal Deflection CATEGORY DESCRIPTION Sweep Req: Synchronization: Sweep triggered by horizon- tal and vertical sync pulses RI: Sweep Length: ≈12 divisions RI: Sweep freeruns without input Req: 1 Line: Sweep Timing Accuracy 2 Line: RI: 5 s/division ±1% 10 s/division ±1% 1 Field: displays one full field, including field rate sync 2 Field: displays two full fields and the field rate sync between them Sweep Linearity Req: 1 line: ±
Appendix A: Performance Specification Table A- 4: Measurement Cursors CATEGORY DESCRIPTION Waveform Accuracy Req: Voltage: 0.5% Timing: 0.5%, for line rate sweeps RI: Vector Accuracy Typically 0.5% for field rate sweeps Req: Gain: ±1.5% Phase: ±1° RI: Measured with respect to the Color Bar signal Table A- 5: RGB/YRGB CATEGORY DESCRIPTION RGB/YRGB Req: Staircase input gain: 0.
Appendix A: Performance Specification Table A- 6: Calibrator CATEGORY DESCRIPTION Waveform Square Wave Req: Amplitude: 1.0 V ±0.5% Req: Frequency: 100 kHz ±0.1% RI: Crystal controlled 10 s square wave Req: Amplitude: 1.
Appendix A: Performance Specification Table A- 7: Vector Mode (Cont.) CATEGORY Subcarrier Regenerator Pull-in Time DESCRIPTION RI: ≤2 seconds Phase Shift with FSC Change Req: NTSC: Phase Shift with Burst Amplitude Change of ±6 dB Req: ≤ 2° Phase Shift With Video Input Channel Change Req: ≤1° Phase Shift With Variable Gain Control +3 dB to --6 dB. Req: ≤0.5° Burst Jitter Clamp Stability PAL: RI: RI: ≤2° (FSC to FSC ±50 Hz) ≤2° (FSC to FSC ±10 Hz) With external reference selected.
Appendix A: Performance Specification Table A- 8: Audio Mode CATEGORY DESCRIPTION Input RI: DC coupled, differential input Input Impedance RI: 20 kΩ Full Scale Selection RI: 0, 4, 8, & 12 dBm full scale. Menu selected Full Scale Accuracy Req: ±0.5 dB Maximum Input Voltage RI: Measured at 1 kHz RI: ±8 V peak RI: Measured to chassis ground Bandwidth (--3 dB) Req: --3 dB ≥200.
Appendix A: Performance Specification Table A- 10: SCH Phase Mode (1750-- Series Only) CATEGORY DESCRIPTION Absolute Accuracy Req: ≤5° RI: Applies over a temperature range of 0 -- 50° C RI: Calibrated at 25° C. ±3 dB input amplitude. Typically ≤5° with ±6 dB input amplitude Relative Accuracy RI: 2° Acquisition Time RI: ≤1 Second Displayed Phase Error Caused by CRT Geometry Variations RI: ±1.
Appendix A: Performance Specification Table A- 12: Power Source CATEGORY DESCRIPTION Mains Voltage Range Req: 90--250 V RI: Continuous range from 90 to 250 Vac Mains Frequency RI: 50 or 60 Hz.
Appendix A: Performance Specification Table A- 14: Physical Characteristics CATEGORY DESCRIPTION Dimensions Req: Height: Width: Depth: Req: Net: Weight Shipping: 5 1/4 inches (133.4 millimeters) 8 1/2 inches (215.9 millimeters) 18 1/8 inches (460.4 millimeters) 8 pounds (3.8 kilograms) 15.7 pounds (7.
Appendix A: Performance Specification Table A- 15: Certifications and compliances (cont.) CATEGORY STANDARDS OR DESCRIPTION Installation (Overvoltage) Category Terminals on this product may have different installation (overvoltage) category designations. The installation categories are: Pollution Degree CAT III Distribution-level mains (usually permanently connected). Equipment at this level is typically in a fixed industrial location. CAT II Local-level mains (wall sockets).
Appendix A: Performance Specification Table A- 15: Certifications and compliances (cont.) CATEGORY STANDARDS OR DESCRIPTION Safety Standards U.S. Nationally Recognized Testing Laboratory Listing UL1244 Standard for electrical and electronic measuring and test equipment. Canadian Certification CAN/CSA C22.2 No. 231 CSA safety requirements for electrical and electronic measuring and test equipment.
Appendix B Remote Connectors Remote Connector The rear-panel REMOTE connector (shown in Figure B-1) is a 25-pin sub miniature D-type with female contacts. Table B-1 shows pin assignments. 13 25 1 REMOTE ! 14 Figure B-1. Rear panel REMOTE connector. Table B-1. Remote Pin Functions and Signal Requirements Pin No. Function 1 RGB/YRGB Staircase Input Signal Requirement +10 V for RGB/ YRGB Miscellaneous Information ≈9 div of sweep.
Appendix B: Remote Connectors Table B-1. Pin No. Remote Pin Functions and Signal Requirements (Cont.) Function Signal Requirement Miscellaneous Information 4 External Blank- Negative-going ing Input signal Enabled by menu selection. 5 Remote Sync Input TTL level square wave triggers a 2-field rate sweep. 30/90 Hz for NTSC 25/100 Hz for PAL 6 Remote Sync Enable Ground (TTL low) Grounding this pin enables the function. 7 Ground 8 +Y Audio Input Max.
Appendix B: Remote Connectors Table B-1. Pin No. Remote Pin Functions and Signal Requirements (Cont.) Function Signal Requirement Miscellaneous Information 19 Preset 3 Ground (TTL low) Grounding pin 19 recalls setup from preset 3. Grounding pins 19 and 25 stores current setup at preset 3. 20 Preset 4 Ground (TTL low) Grounding pin 20 recalls setup from preset 4. Grounding pins 20 and 25 stores current setup at preset 4.
Appendix B: Remote Connectors Remote Connector Converter When the 1740A/ 1750A-- Series is used as a direct replacement for a 1740-- Series or 1750-- Series instrument, construct an adapter or rewire the remote cable according to Figure B-2. 1740A/1750A-- Series Rear-Panel REMOTE Connector 14 Remote Plug 1 RGB INPUT 3 RGB ENABLE 5 6 7 13 14 REMOTE SYNC IN GROUND REMOTE SYNC ENABLE 25 1 8 9 10 13 19 25 Figure B-2. REMOTE adapter for 1740/1750---Series replacement.
Appendix B: Remote Connectors RS232 Connector The serial interface has a driver built in for RS232 serial binary data interchange. The operational mode is full duplex. The data rate is selectable through the Configure menu for either 1200, 4800, or 9600 baud; data type is asynchronous. Figure B-3 shows the pin assignments. PIN NUMBER 5 9 1 RS232 6 1. 2. 3. 4. 5. 6. 7. 8. 9.
Appendix C User Service This section contains instructions for user and preventive maintenance. If the instrument does not function properly, it should be referred to qualified service personnel or returned to Tektronix for service. Packaging directions for shipment are on page 1-9. Cleaning or Replacing the Fan Filter To ensure adequate air flow, it is essential to clean or replace the rear-panel fan filter regularly.
Appendix C: User Service Graticule Light Replacement Replacement Bulbs Replacement bulbs are supplied with this instrument as Standard Accessories. Additional bulbs can be purchased from Tektronix or from local electronics distribution sources. The Tektronix part number and ordering information is given on page 1-7. Required Equipment NOTE For graticule light removal and replacement, tweezers with curved, serrated tips are recommended.
Appendix C: User Service 3. To remove a bulb, position the tweezer tips on the thin, flat portion of the bulb (close to the plastic socket). Carefully pull the bulb straight out. 4. To install a new bulb, hold it with the tweezers as described in step 3, position it in front of the socket, and push the bulb until it snaps in place. 5. Replace the panel below the CRT, and press on both the right and left sides of the panel until it snaps into place. 6.
Appendix C: User Service Cleaning The instrument should be cleaned often enough to prevent dust and dirt from accumulating. Dirt acts as a thermal insulator, preventing effective heat dissipation, and can also provide high-resistance electrical leakage paths between conductors or components in a humid environment. CAUTION Do not allow water to get inside any enclosed assembly or component.
Appendix C: User Service CAUTION A 2% RMA flux content solder is recommended for making repairs in this instrument. Cleaning of rosin residue is not recommended. Most cleaning solvents tend to reactivate the rosin and spread it under components where it may cause corrosion under humid conditions. The rosin residue, if left alone, does not exhibit these corrosive properties. Replacing the CRT Filter A smoke-gray filter is installed over the face of the CRT. The filter part number is given on page 1-7.
Appendix C: User Service C-6 6. Replace the bezel and bezel screws. Tighten screws (8 in lbs). 7. Replace the panel below the CRT, and press on both the right and left sides of the panel until it snaps into place. 8. Replace the five knobs below the CRT and tighten the set screws.
Appendix D Software Version Table D-- 1 details software releases from SNB010100 to present. If a new release occurs after this manual is printed, a revised Table D-- 1 will be shipped with the manual. Table D-1. Software Releases Version Date Serial No. 1.00 SEP 1992 1740A’s B010100 1.01 NOV 1992 1740A’s B010458 Mod No. Comments Original software. M7875 0 1750A’s B010100 Installed in new products, not sent for field upgrade. • Added AUTO unit of measure selection for CURSORS.
Appendix D: Software Version Table D-1. Software Releases (Continued) Version 1.04 Date JAN 1993 Serial No. Mod No. 1740/41A, 1750/51A B010729 M7891 4 Comments Product enhancement to coincide with the release of dual-standard monitors. Not sent for field upgrade. • Remote sync changed to positive edge trigger. 1745/55A B010100 • CONFIG REFERENCE menu now avail. only for dual-standard monitors.
Glossary
Glossary AC Coupled A connection which removes the constant voltage (DC component) on which the signal (AC component) is riding. Usually implemented by passing the signal through a capacitor. APL (Average Picture Level.) The average signal level (with respect to blanking) during active picture time, expressed as a percentage of the difference between the blanking and reference white levels.
Glossary Breezeway The portion of the video signal which lies between the trailing edge of the horizontal sync pulse and the start of burst. Breezeway is part of back porch. Broad Pulses Another name for the vertical synchronizing pulses in the center of the vertical interval. These pulses are long enough to be distinguished from all others, and are the part of the signal actually detected by vertical sync separators.
Glossary Color Difference Signals Signals used by color television systems to convey color information in such a way that the signals go to zero when there is no color in the picture. R-- Y, B-- Y, I, and Q are all color difference signals for the NTSC system; U and V are color difference signals for the PAL system. Component Video Video which exists in the form of three separate signals, all of which are required in order to completely specify the color picture.
Glossary Distortion If a sine wave of a single frequency is put into a system, and harmonic content at multiples of that frequency appears at the output, there is harmonic distortion present in the system. Harmonic distortion is caused by non-- linearities in the system. Equalizer The pulses which occur before and after the broad pulses in the vertical interval. Envelope Detection A demodulation process in which the shape of the RF envelope is sensed. This is the process used by a diode detector.
Glossary Gen Lock The process of locking both sync and burst of one signal to sync and burst of another, making the two signals completely synchronous. Graticule The scale which is used to quantify the information on a waveform monitor or vectorscope display. Graticules may either be screened onto the faceplate of the CRT itself (internal graticule), or onto a piece of glass or plastic which fits in front of the CRT (external graticule). They can also be electronically generated.
Glossary Luminance The signal which represents brightness, or the amount of light in the picture. This is the only signal required for black and white pictures, and for color systems it is obtained as a weighted sum (Y = 0.3R + 0.59G + 0.11B) of the R, G, and B signals. Modulated (NTSC) When referring to television test signals, this term implies that chrominance information is present. (For example, a modulated staircase has subcarrier on each step.
Glossary Quadrature Distortion Distortion resulting from the asymmetry of sidebands used in vestigial sideband television transmission. Quadrature distortion appears when envelope detection is used, but can be eliminated by using a synchronous demodulator. RF Radio Frequency. In television applications, RF generally refers to the television signal after the picture carrier modulation process RGB Red, Green, and Blue. Also referred to as GBR.
Glossary Subcarrier The modulation sidebands of the color subcarrier contain the R-- Y (V) and B-- Y (U) information. For NTSC, subcarrier frequency is 3.579545 MHz. For PAL, subcarrier frequency is 4,433,618.75 Hz. Synchronous Detection A demodulation process in which the original signal is recovered by multiplying the modulated signal with the output of a synchronous oscillator locked to the carrier.
Glossary Vertical Interval The synchronizing information which appears between fields and signals the picture monitor to go back to the top of the screen to begin another vertical scan. Waveform Monitor A specialized oscilloscope that plots voltage versus time to evaluate television signals. Y Abbreviation for luminance. Zero Carrier Reference A pulse in the vertical interval which is produced by the demodulator to provide a reference for evaluating depth of modulation.
Index
Index A Certifications, A-13 A123/B123, 2-6, 3-4 Chroma bandwidth measurements, 3-7, 4-9 Accessories, 1-7 field upgrade kits, 1-8 incoming inspection list, 1-9 Compliances, A-13 Clamp point, 3-18 Cleaning optional, 1-7 air filter (fan filter), C-1 standard (included), 1-7 the CRT, C-4 the instrument, C-4 Air filters, replacement, 1-7 Audio display, 2-5, 3-2 Clear menu, 2-8 Audio measurements, 4-15 Color framing, 3-2 Audio Mode, Specification, A-10 Component signals, 4-3 Auto Configure menu
Index Dimensions, A-13 menu, 3-24 Display modes, 2-5, 3-1 reset, 3-22 Dual-standard graticule, 4-8 X1, X5, X10, 3-24 Graticule illumination, 3-24 E vector, 4-7 waveform, 4-1 Electrical installation, 1-10 Electrical specification, A-2 Graticule lights part number, 1-7 replacement, C-2 Environmental Characteristics, Specification, A-12 External horizontal, 3-23 External Reference, Specification, A-5 External reference, 2-6, 2-8 configure, 3-23 H HAD bar, 4-5 for dual-standard monitors, 3-23 F H
Index M Overlay mode, 2-7, 3-4 Magnifier, 2-5, 3-4 Mains frequency, 1-11 Manual, part numbers, 1-7 P Markers, 3-9 Packaging for shipment, 1-9 Measurement Cursors, Specification, A-7 Parade mode, 2-6, 3-4 Measurements, 4-1 Performance specification, A-3 Physical Characteristics, Specification, A-14 audio, 4-15 chroma bandwidth, 4-9 differential phase and gain, 4-9 horizontal sync amplitude, 4-5 k-factor, 4-5 peak white, 4-5 pulse-to-bar, 4-5 SCH phase, 4-10 vector, 4-9 Mechanical installation, 1-1
Index Sweep rates, 4-1 RS232 connector, 2-9, B-5 selecting, 2-5, 3-4 Sync jitter, 3-2 S Sync tip, 3-18 Scale illumination, 3-24 SCH display, 2-5, 3-2 SCH phase measurements, 4-10 SCH Phase Mode, Specification, A-11 T Television standard (NTSC/PAL), 1-1, 3-20 SCH R-Y, 3-7 Test mode, 3-18 Serial interface, B-5 Time Code, Specification, A-10 Servicing, 1-9 Time code display, 2-5, 3-3, 4-16 Set, instrument gain, 3-22 Setup, graticule, 4-2 Timing cursors, 3-9 Trace rotation, 3-24 Signal intensity
