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1. Relative angle indicates degree of SC H phase Fi a g ut S JM NIS EH gt VECTOR PHASE E Figure 4 6 NTSC dual dot SC H display 100 Se Burst Vector M _ E NTSCEH alc Se VECTOR PHASE H pac Figure 4 7 NTSC single dot SC H display 1740A 1750A Series Waveform Vector Monitor User Manual 4 11 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 vec tors 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 proper ly color framed when the sync dot is within 90 of the burst vector Figure 4 8 PAL SC H display SC H R Y SC H phase can be viewed over a frame of video Select WAVEFORM display and FIELD sweep Enter the FILTER menu and select SC H R Y For NTSC stable SC H is a horizontal line as shown in Figure 4 10 Figure 4 9 shows the same display with a LINE sweep selected A sample SC H phase error is shown in Figure 4 11 The flat lines indicate that SC H phase is stable over the entire frame For PAL SC H is a sine wave resulting from the 25 Hz offse
2. INHOJ3AVM HOlO3AHB ATdILINN 9 AV1dSI0 YOLINOW H0193A WH033AVM VOTZL xtuonyaL d SOd 183A 1740A Front Panel Figure 2 2 2 3 1740A 1750A Series Waveform Vector Monitor User Manual At A Glance 43MOd 149 NIVO SIJNOO 13534d 73 uosuno dari 93301533 ll 1534 Ja 3009 AYNLOld 1 3 AV TH3 O Bl 9379 WNHOdJ3 VM RESER WOSLL aera FINN Pd SOd 183A 1750A Front Panel Figure 2 3 1740A 1750A Series Waveform Vector Monitor User Manual 2 4 At A Glance POSITION 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 WAVEFORM provides voltage vs time display of the video signal W VECTOR presents an XY plot of demodulated chromi nance phase and amplitude W AUDIO amplitude and phase is monitored using a calibrated X Y Lissajous display W SCH provides a vector display of the subcarrier to horizontal sync phase relationship W PICTURE allows the operator to verify the signal source W TIME CODE provides monitoring of longitudinal time code in a frame rate display W MU
3. 4 14 Figure 4 12 Two Field SC H R Y display PAL 4 14 Figure 4 13 Audio displays 4 15 Figure B 1 Rear panel REMOTE connector B 1 Figure B 2 REMOTE B 4 Figure B 3 Rear panel RS232 connector B 5 Figure C 1 Graticule light replacement C 3 x 1740A 1750A Series Waveform Vector Monitor User Manual 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 Topics covered in the user manual are as follows Introduction Getting Started Operation Basics Making Measurements Appendix A provides instrument specifications both electrical and mechanical Appendix B describes remote control interfaces Appendix C covers routine service procedures such as replacing fuses and graticule light bulbs The appendixes are followed by a glossary of specialized terms and an index 1740A 1750A Series Waveform Vector Monitor User Manual xi Preface Service Manual Topics covered in the service manual are as follows Specifications Operating Information Theory of Operation Performance Verification Adjustment Procedures Maintenance Options
4. B 1 Remote Connector Converter B 4 Appendix C User Servit C 1 Cleaning or Replacing the Fan Filter C 1 Fuse Replacement C 1 Graticule Light Replacement C 2 Cleaning C 4 Replacing the CRT Filter C 5 Appendix D Software Version D 1 Glossaty eee VERE ERN NER eae G 1 1 1 1740A 1750A Series Waveform Vector Monitor User Manual Table of Contents LIST OF FIGURES Figure 2 1 Multi Use Bezel Controls and Buttons 2 2 Figure 2 2 1740A Front Panel 2 3 Figure 2 3 1750A Front Panel 2 4 Figure 2 4 1740A 1750A Series Rear Panel 2 10 Figure 2 5 Equipment hook up for Operator s Checkout PFOCEdUre vun ee mace 2 12 Figure 2 6 Calibrator display 2 14 Figure 2 7 Two Line LUM filter display of color bar signal 2 17 Figure 2 8 Two Line CHROM filter display of color bar signal 2 17 Figure 2 9 Two Line DIFF filter display 2 18 Figure 2 10 Two Line R Y display of color bar signal 2 19 Figure 2 11 SC H R Y display 56 2 19 Figure 2 12 SC H R Y display PAL 2 20 Figure 2 13 Line Select display in 2
5. gt 20 0 Video Input Return Loss Req 40 dB to 6 MHz RI Typically 46 dB to 6 MHz 40 dB to 10 MHz Video Input DC Offset lt 11 7 mV PAL Between Channels RI Typically lt 1 mV Video Input Offset Range 2 3 B2 amp B3 can be offset from or CHB1 by 350 mV A 2 1740A 1750A Series Waveform Vector Monitor User Manual Appendix A Performance Specification Table A 1 Waveform Vertical Deflection Cont CATEGORY Video Input Loop Through Isolation Video Input Crosstalk Between Channels Frequency Response Flat Luminance Filter Gain Luminance Filter Response Luminance Filter Chrominance Rejection 1745A amp 1755A only Chrominance Filter Gain Chrominance Filter Bandwidth Chrominance Filter Attenuation at 2X Fsc Differentiated Step Filter Attenuation at 2X Fsc 1740A 1750A Series Waveform Vector Monitor User Manual DESCRIPTION Typically 270dB Typically gt 60 dB Req Req Req Req Req Req x 296 to 10 MHz X1 Gain 4 to 10 MHz X5 and X10 Gain on screen signal 0 2 V or 0 1 V inputs ac or dc coupling 1 1 Reference is FLAT at 50 kHz lt 3 dB attenuation at 1 MHz 40 dB attenuation at Fsc x34 dB 1 1 RI Ref is flat at Fsc 3 58 or 4 43 MHz 1 5 MHz 0 3 MHz RI Centered at Fsc Passband is typically Fsc and 750 kHz gt 25 dB gt 40 A 3 Appendix A Perf
6. Table of Contents Operation Basics Functional Overview 3 1 Display Modes 3 1 Vector ou eb ARA DIG ENG E E 3 1 Waveform 3 1 3 2 vielen 3 2 Piet re oy eirs EDU EX DOE GA Bene 3 2 Time Gode near ee ees 3 3 Multiple coner Ru ea 3 3 Displaying a Signal 3 3 3 3 Using the Menus 3 5 General Menu Information 3 5 Multi Use Bezel Controls and Buttons 3 5 Moving Between Menus 3 5 Clear Menu are ere uet 3 6 Exiting a Menu Function 3 6 Filter Menu ioo er ea ye 3 7 Gursor Menu ias ven ea RADO dan Brad 3 8 Waveform Cursor Control 3 9 Vector Waveform Multiple 3 11 Using the Cursors 3 11 Line Select Menu 3 14 Preset Menu 3 16 Configure Menu 3 18 INPUT oer ect o C eate e e pce 3 18 VECTOR 34 04 viv nr Pain deed 3 18 FORMAT enden 3 19 STANDARD 4 EXER 3 20 OFFSET za een 3 21 CALIBRATE sient can pix 3 21 REMOTE a a ee Dia re 3 23 REFERENCE Dual Standard Only 3 23 Gain Menu sau cs da cade tad m Pe S 3 24 Menu 3 24 1740A 1750A Series Waveform Vector Monitor User M
7. 1740A 1750A Series Waveform Vector Monitor User Manual 2 21 Operator s Checkout Procedure Figure 2 15 Picture mode display of color bar signal 2 22 1740A 1750A Series Waveform Vector Monitor User Manual 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 SCH Display 1750A Only The SCH display mode provides a vector display of the subcarrier to horizontal sync phase relationship SCH measurements appear on page 4 10 For NTSC operation verify that REF is set to internal then select SCH display mode This provides a dual dot display as shown in Figure 2 17 Select EXT REF This provides the single dot display shown in Figure 2 18 For PAL operation the REF selection does not affect the display A sample PAL display is shown in Figure 2 18 Figure 2 16 Audio d
8. 1740A 1750A Series Waveform Vector Monitor User Manual 3 7 Using the Menus 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 Vector Cursor Control In VECTOR display mode a bezel button is used to select po lar cursors POLAR or markers MARK The polar cursor ap pears as crosshairs as shown in Figure 3 2 The left bezel control is used to adjust cursor amplitude and the center con trol adjusts cursor phase The right bezel control adjusts the phase of the vector signal When Vector markers are selected additional readouts ap pear allowing the user to select the quantity of markers that will be present 1 through 8 and which of these markers is currently controlled by the bezel controls The left bezel control adjusts the amplitude of the selected marker and the center bezel control adjusts its phase The right bezel control adjusts the phase of the vector signal 3 8 1740A 1750A Series Waveform Vector Monitor User Manual Using the Menus 00006
9. Gain Menu CRT Menu 3 24 Any one of three calibrated gain ratios can be selected X1 X5 or X10 Variable gain is also available indepen dent of the other gain settings When variable gain is on the left bezel control adjusts the signal gain 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 When variable gain is turned off the instrument returns to the calibrated gain setting Operator adjustments made with variable gain will be restored when variable gain is selected again DISPLAY is used for signal and etched graticule adjust ments When DISPLAY is selected the left bezel control adjusts the signal focus FOCUS the center bezel control adjusts the etched graticule illumination SCALE and the right bezel control adjusts the signal intensity INTENSITY READOUT refers to electronic graticules markers menu and measurement readouts When READOUT is selected a test pattern containing a vertical line and a horizontal line is displayed Use the left bezel control VPOS and the center bezel control HPOS until the lines cross at the center of the etched graticule This will compensate for minor shifting of markers due to drift or external magnetic fields particularly if the instrument is moved after the markers are set The right bezel control adjusts readout intensity INTEN
10. 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 waverorm Mode Only The FILTER menu is available for WAVEFORM mode only Note that the instrument must be in WAVEFORM mode to ac cess 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 FLAT provides flat normal response LUM provides a low pass response to display the uminance portion of the composite video signal CHROM provides bandpass response centered on the chrominance subcarrier frequency and displays frequencies around the subcarrier frequency DIFF is a differentiated step filter linearity steps are translated into impulses for amplitude compari son R Y selects demodulated chrominance versus time display The chrominance is demodulated on the R Y V axis when burst is lined up on the normal axis The VECTOR PHASE control can adjust the demodulator phase to any axis SCH R Y 1750A Series Only demodulates the SCH sync locked oscillator This display is useful for viewing SCH variations versus time F L displays the video signal both flat and luminance filtered The display is in parade or overlay mode as selected through the on screen menu When PARADE is selected the flat display is on the left
11. 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 equip ment If the associated equipment is operating normally refer the 1740A 1750A Series to qualified service personnel for repair or adjustment Required Equipment The following equipment is required to perform this proce dure 1 Television Signal Generator with Composite Color Bars For example TEKTRONIX TSG 130 Series Signal Generator 2 Coaxial Cable 750 5 For example 42 inch RG59U Tektronix Part No 012 0159 00 3 750 Terminators End line 4 For example Tektronix Part No 011 0102 00 Initial Equipment Connections m Connect the 1740A 1750A Series to an appropriate AC power source 1740A 1750A Series Waveform Vector Monitor User Manual 2 11 Operator s Checkout Procedure m Connect the generator NTSC output COMPOSITE for TSG131 to the CH A input Connect the CH A loop through to the EXT REF input and connect 7562 terminator to the EXT REF loop through See Figure 2 5 65000 0000000 0000 0000000 Figure 2 5 Equipment hook up for Operator s Checkout Procedure Procedure 2 12
12. Certain conditions may cause the 1740A 1750A Series instrument front panel controls to become locked Reset as follows 1740A 1750A Series Waveform Vector Monitor User Manual 2 1 At A Glance m Turn off instrument power m 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 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 Multi Use Controls m The center three controls located under the CRT have functions assigned and labeled through the on screen menus and readouts These controls will be referred to as Bezel Controls See Figure 2 1 m Five small buttons along the right side of the CRT enable users to make selections when on screen menus are in use These buttons will be referred to as Bezel Buttons Five Bezel Buttons Three Bezel Controls Figure 2 1 Multi Use Bezel Controls and Buttons 2 2 1740A 1750A Series Waveform Vector Monitor User Manual At A Glance 43MOd 149 NIVO SIJNOO 13534d 73 uosuno dari NNIN 3401S34 1534 Ja 1x38 AV TH3AO 9379
13. European Union Compliance Additional Compliance IEC61010 1 Safety requirements for electrical equipment for measurement control and laboratory use Safety Certification Compliance Tenperature 45to 440 C operating Altitude maxinum 2000 rreters operating Equiprrent Type Test and measuring Safety Class Class 1 as defined in IEC 1010 1 Annex H grounded product Overvoltage Category Overvoltage Category II as defined in IEC 1010 1 Annex Pollution Degree Pollution Degree 2 as defined in IEC 1010 1 Note Rated for indoor use only 1740A 1750A Series Waveform Vector Monitor User Manual A 15 Appendix A Performance Specification A 16 1740A 1750A Series Waveform Vector Monitor User Manual 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 Figure B 1 Rear panel REMOTE connector Table B 1 Remote Pin Functions and Signal Requirements Pin No Signal Requirement Miscellaneous Information 1 RGB YRGB HOV for RGB 9 div Of sweep Staircase Input YRGB Staircase extemal horizontal and RGB YRGB selections are made through the menu 10 div of horiz deflection Grounding this pin enables the function Staircase or extemal horizontal selected by menu 1740A 1750A Series Waveform Vector Monitor User Manual Appendix B Remote Connectors
14. SITY Readout intensity will not go below the calibrated minimum value when menus are displayed TRACE adjusts trace rotation Exiting the menu will return the instrument to normal opera tion with the new settings in effect 1740A 1750A Series Waveform Vector Monitor User Manual Remote Operation The 25 pin rear panel REMOTE connector is a subminiature D type connector It accepts the input for RGB YRGB stair case external horizontal remote sync external blanking time code and Left and Right audio TTL signal or ground clo sure to designated pins will enable Staircase External Hori zontal or Remote Sync displays When Remote Sync is enabled the on screen TIME DIV read out is not present When Remote Sync or External Horizon tal is enabled with timing cursors UNCAL is displayed in place of a quantitative readout The REMOTE connector is configured for Staircase RGB or YRGB or External Horizontal input through the CONFIGURE menu shown on page 3 18 The user can store and recall up to eight front panel setups through the remote Remote connector pin assignments and an operational description begin on page B 1 Using Presets through the Remote The 1740A 1750A Series has 10 presets capable of storing front panel setups Presets one 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 l
15. Table B 1 Remote Pin Functions and Signal Requirements Cont Pin No Miscellaneous Information Extemal Blank Negative going Enabled by rrenu selection ing Input signal 30 90 Hz for NTSC 25 100 Hz for PAL Remote Sync Ground TTL low Grounding this pin enables the Enable function fe We een Y Audio Input Max Inout 8V Measured to Chassis Ground peak Y Audio Input Max Input 8V Measured to Chassis Ground peak 10 4X Audio Input Max Input 8V Measured to Chassis Ground peak X Audio Input Max Input 8V Measured to Chassis Ground peak 12 Tine Code 10 HOV peak Longitudinal Time Code differen Input tial 13 Tirre Code 10 HOV peak Longitudinal Time Code differen Input tial afen sene wem 17 Preset 1 Ground TTL low Grounding pin 17 recalls front panel setup from preset 1 Grounding pins 17 and 25 stores current front panel setup at preset 1 18 Preset 2 Ground TTL low Grounding pin 18 recalls front panel setup from preset 2 Grounding pins 18 and 25 stores current front panel setup at preset 2 B 2 1740A 1750A Series Waveform Vector Monitor User Manual N 0 Table B 1 Appendix B Remote Connectors Remote Pin Functions and Signal Requirements Cont Pin No Miscellaneous Information 19 21 24 Preset 3 Preset 4 Preset 5 Ground TTL low Ground TTL low Ground TTL low reas Jen rear auras peas Grounding p
16. Test equipment used to verify Performance Requirements must be calibrated and working within the limits specified in the Service Manual Equipment Re quired List Reference Information Information that ampli fies a performance requirement or is of special impor tance is indicated by There is no need to check these items to a specific tolerance Reliability Mean Time Between Failure MTBF The demonstrated MTBF goal is 40637 hours MTBF at 25 C ambient which will be monitored from field failure reports Mean Time to Repair MTTR The projected MTTR is 1 hour 1740A 1750A Series Waveform Vector Monitor User Manual A 1 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 196 of 140 IRE 1 00 V PAL X5 Gain 0 2 volt input displayed within 196 of 140 IRE 1 00 V PAL X10 Gain 0 1 volt input displayed within 1 of 140 IRE 1 00 V PAL one of the 8 inputs Variable Gain Range Req 0 2X to 1 4X Overscan Req lt 1 variation in baseline of chroma when positioned anywhere between sync tip and 100 white X5 or X10 with any variable gain setting Video Maximum Operating 1 8 V to 42 2 V all inputs A B3 Input Voltage dc peak ac Absolute Video Input Voltage 8 5 V to 8 5 V dc peak ac Video Input DC Impedance
17. one line or 15 lines NEXT FIELD appears only when 1of 2 FIELD is selected Push the bezel button corresponding to NEXT FIELD to sequence through the fields desig nated by the FIELD selection A box flashes mo mentarily around the on screen label to verify that the selection has been made 1750A Series 3 14 FIELD ALL or 10f2 or 1of 4 or 10f8 1H or 15H one line or 15 lines NEXT FIELD appears only when 1 of 2 10f4 or 1of 8 FIELD is selected Push the bezel button corresponding to NEXT FIELD to sequence through the fields designated by the FIELD selection ALT 2 FIELD appears only when 1 of 4 FIELD is selected Push the bezel button corresponding to ALT 2 FIELD to toggle between the current field and the second next field for example FIELD1 and FIELD3 ALT 4 FIELD appears only when 10f sFIELD is selected Push the bezel button corresponding to ALT 4 FIELD to toggle between the current field and the fourth next field for example FIELD1 and FIELDS 1740A 1750A Series Waveform Vector Monitor User Manual 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 e
18. used to refer to that standard PAL Phase Alternate Line Refers to one of the television systems used in Europe and many other parts of the world The phase of one of the color difference signals alternates from line to line to help cancel out phase errors Quadrature AM A process which allows two different signals to modulate a single carrier frequency The two signals of interest Amplitude Modulate carrier signals which are the same frequency but differ in phase by 90 degrees hence the Quadrature notation The two resultant signals can be added together and both signals recovered at the other end if they are also demodulated 90 degrees apart 1740A 1750A Series Waveform Vector Monitor User Manual 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 synchro nous demodulator RF Radio Frequency In television applications RF gener ally refers to the television signal after the picture carrier modulation process RGB Red Green and Blue Also referred to as GBR The three primary colors used in color television s additive color reproduction system These are the three color signals generated by the camera and used by the picture monitor to produce a picture R Y One of the color difference signals is obtained by subtracting luminance Y from the r
19. 1750A Series Only The SC H display provides a vector display of the subcarrier to 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 The location of the horizontal sync dot is the SC H phase of the signal With the dual dots SC H phase range is limited to 180 because the SC H phase of a single signal referenced to itself can only vary 90 At 180 the video signal again has a field subcarrier phase sequence making it SC H phased Single Dot Display When REF is set to EXT the 1750A has a single dot display Figure 4 7 This relative mode allows the comparison of two signals the selected INPUT and EXT REF The phase shift between the two subcarriers can extend from 0 to 360 A dot near 0 relative to burst indicates the input is perfect ly SC H phased with the EXT REF input and that the color frames are properly matched A phase reading of 180 indi cates that the INPUT and EXT REF color frames are not proper ly matched 4 10 1740A 1750A Series Waveform Vector Monitor User Manual Basic Measurements TNS ai u le de T SERI Was P eric Bai 9 I 1 ETE 100
20. 25 55 Hz with 0 020 inch dis placement Req Req Req Military Specification Mil T 28800D Paragraph 1 2 2 Class 3 Non Operating 50 g 1 2 sine 11 ms duration 3 shocks per surface 18 total Qualified under NSTA Test Procedure 1A Category II 24 inch drop Will operate at 9596 relative humidity for up to five days Do not operate with visible moisture on the circuit boards 1740A 1750A Series Waveform Vector Monitor User Manual Appendix A Performance Specification Table A 14 Physical Characteristics CATEGORY DESCRIPTION Dimensions Req 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 Req Net 8 pounds 3 8 kilograms Shipping 15 7 pounds 7 2 kilograms approximate Certifications and Compliances Table A 15 Certifications and compliances CATEGORY STANDARDS OR DESCRIPTION EC Declaration of Conformity 1 Meets intent of Directive 89 336 EEC for Electromagnetic Corrpatibility Corrpliance wes demonstrated to the following specifications as listed in the Official J oumal of the European Union EN 50081 1 Errissions EN 55022 Class B Radiated and Conducted Enissions EN 50082 1 Irrrrunity IEC 801 2 Electrostatic Discharge Irrrrunity IEC 801 3 RF Electromagnetic Field Irrrrunity IEC 801 4 Electrical Fast Transient Burst Irrrrunity 1 High quality shielded cables must be used to ensure compliance to
21. FIELD sweep 2 21 Figure 2 14 Vectorscope color bar display 2 22 Figure 2 15 Picture mode display of color bar signal 2 22 Figure 2 16 Audio display with phase error 2 23 Figure 2 17 NTSC SC H display 2 24 Figure 2 18 PAL SC H display 2 24 Figure 3 1 The CRT menu 3 6 Figure 3 2 The VECTOR CURSOR menu 3 8 Figure 3 3 The WAVEFORM CURSOR menu 3 10 Figure 3 4 The VECTOR WFM CURSOR menu 3 10 Figure 3 5 The PRESET menu display 3 16 Figure 3 6 The CONFIGURE menu display 3 19 Figure 4 1 NTSC waveform vector graticule 4 2 Figure 4 2 PAL waveform vector graticule 4 3 Figure 4 3 Dual Standard waveform vector graticule 4 4 Figure 4 4 Vector targets 4 8 Figure 4 5 Differential Gain and Phase Measurements 4 9 Figure 4 6 NTSC dual dot SC H display 4 11 Figure 4 7 NTSC single dot SC H display 4 11 Figure 4 8 PAL SC H display 4 12 Figure 4 9 Two Line SC H R Y display NTSC 4 13 1740A 1750A Series Waveform Vector Monitor User Manual ix Table of Contents Figure 4 10 Two Field SC H R Y display NTSC 4 13 Figure 4 11 Two Field SC H R Y display NTSC showing approximate 10 phase error
22. Figure 2 11 NTSC signals can be viewed in either line or field sweeps For PAL applications view the signal in two field sweep see Figure 2 12 Use the right bezel control to adjust vector phase Exit the FILTER menu Enter the menu again and note that the filter selections are unchanged Select FLAT Exit the menu Te el DIV Oy SES Ts IE 55 SER Croc 80 Breese pem L 60 fas 1r 7 XT 2 E 35V 40 a SF 20 Er E e spes L bs H SE ESV H A AE Seng ga 20 y TN wS 4 e 35 ra NTS CEH Figure 2 9 Two Line DIFF filter display of 5 step staircase signal 2 18 1740A 1750A Series Waveform Vector Monitor User Manual Operator s Checkout Procedure Figure 2 11 Two Field SC H R Y display NTSC showing proper SCH phase 1740A 1750A Series Waveform Vector Monitor User Manual 2 19 Operator s Checkout Procedure BM 554 B gt 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 PIC TURE Ent
23. The flat display is now on the left followed by the luminance filtered display 1740A 1750A Series Waveform Vector Monitor User Manual Operator s Checkout Procedure amp ho Figure 2 7 Two Line LUM filter display of color bar signal Tek zn en OuS DIV BES Qu hal 100 ey Mas 7V L EE CHROM 40 8 j Fab Tug m _ 35 SCHR Y F L MEME 21115 720 7 40 3 99 U 58 zE y c NTSCEH gt 17 FA PAL Figure 2 8 Two Line CHROM filter display of color bar signal 1740A 1750A Series Waveform Vector Monitor User Manual 2 17 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 ver sus time display Use the right bezel control to adjust vector phase See Figure 2 10 Select SCH R Y 1750A only This provides a demodulated SC H sync locked oscillator display useful for viewing SC H variations versus time A sample NTSC display is shown in
24. V dc peak ac Voltage Absolute Maximum Input 8 5 V to 8 5 V dc peak ac Voltage DC Input Impedance gt 20 0 Return Loss Req 40 dB to 6 MHz Typically 46 dB to 6 MHz 40 dB to 10 MHz 1740A 1750A Series Waveform Vector Monitor User Manual A 5 Appendix A Performance Specification Table A 3 Waveform Horizontal Deflection CATEGORY Sweep Sweep Timing Accuracy Sweep Linearity Magnified Sweep Accuracy Magnified Sweep Linearity Horizontal Position Range External Horizontal Input Remote Sync DESCRIPTION Req Req Req Req Req Req Req Synchronization Sweep triggered by horizon tal and vertical sync pulses Ri Sweep Length 12 divisions RI Sweep freeruns without input lLine 5 us division 1 2 Line 10 us 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 1 line 1 2 line 1 1 Line 0 2 us division 1 2 Line 1 0 us division 1 1 line 1 2 line 1 Any portion of the synchronized sweep can be positioned on screen in all sweep modes 2 divisions volt 2 Menu is selected and enabled by RE MOTE connector ground closure Input Amplitude TTL level RI Frequency 25 Hz to 100 Hz positive edge triggered sweep Enabling Signal TTL low or ground closure A 6 1740A 1750A Series Waveform Vect
25. channel 1 A or B While the offsets are enabled the VERTICAL POSI TION 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 The selected offset amount will be recalled the next time OFFSET is enabled m When A2A3 OFFSET is on the center and right bezel controls are assigned to CH A2 and CH A3 offsets On screen labels appear just above each control Turning these controls will offset the CH A2 and CH signals with respect to CH A1 When B2B3 offset is on the same two controls are assigned to CH B2 and CH B3 m When both A2A3 and B2B3 offsets are on the user assigns the controls to either A or B offsets The CONTROL selection only appears when both A and B OFFSETS are selected m An offset will remain in effect until the user turns the offset OFF Exiting the CONFIG menu will not affect the OFFSET ON OFF setting CALIBRATE These choices are offered when CALIBRATE is selected W CAL SIG Turns the 1 V internal calibrator signal on off W GAIN CAL Turns on the gain calibration adjust ment on off 1740A 1750A Series Waveform Vector Monitor User Manual 3 21 Using the Menus Additional choices appear when CAL SIG or GAIN CAL is turned on CAL SIG ON n 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 stan
26. cleaning and maintenance should be performed by qualified service personnel only Instructions for interior maintenance are provided in the service manual 1740A 1750A Series Waveform Vector Monitor User Manual Appendix C User Service A 296 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 If the filter becomes damaged it can be replaced in the following manner 1 2 Remove the five knobs below the CRT Insert a small straight blade screwdriver into the re cessed area on either the right or left side of the panel Pry gently until the panel snaps out of the front panel frame See Figure C 1 for panel and recess location Remove the two Torx screws that fasten the bezel to the instrument Grasping the bottom of the bezel pull out and upward to remove the bezel from the instrument There are two hinges at the top of the bezel that hold it in place once the bezel is at an approximate 45 angle with the front panel they will disengage Remove the damaged filter and snap the new filter into place on the b
27. field production applications Calibrator Vertical and horizontal instrument gain can be set using the calibrator signal The 1 Volt calibrator signal is available in 100 kHz and Fsc color subcarrier rates More Information m Standard and optional accessories are listed in the Accessories section which follows this product descrip tion Instrument options are listed on page 1 5 m complete listing of instrument specifications begins on Appendix page A 1 1740A 1750A Series Waveform Vector Monitor User Manual 1 3 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 speci fied instruments are shipped with a North American 125 V power cord and one replacement fuse Unless otherwise specified power cords for use in North America are UL listed and CSA certified Cords for use in areas other than North America are approved by at least one test house acceptable in the country to which the product is shipped Option A1 Power Universal Europe 220 V 16 A Locking Power Cord Option A2 Power United Kingdom 240 V 15 A Power Cord Option Power
28. individually displayed or selected in various combinations m Remote interface and serial RS232 interface Description of Features Menu A notable feature of these monitors is the menu assisted operation An expanded feature set is possible through the use of menus and multi use controls and buttons When the operator selects a menu item such as VOLTAGE TIMING CURSORS VARIABLE GAIN or LINE SELECT an on screen label shows the current function of the controls Many instrument configurations that required moving inter nal jumpers or wire straps in the 1740 1750 Series monitors are made through an on screen menu in the 1740A 1750A Series The operator can also recall up to 10 front panel setups through the RECALL menu 9 recalls are user program 1740A 1750A Series Waveform Vector Monitor User Manual 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 A white phosphorus CRT is option al refer to page 1 6 for details The bright CRT allows use in high ambient light conditions such as those encountered in
29. is divided up into two fields Each field contains one half of the lines required to produce the entire picture Adjacent lines in the picture are in alternate fields Frequency Modulation FM is the process by which the frequency of a carrier signal is varied in proportion to the signal of interest In both the NTSC and PAL television systems audio information is transmitted using FM Frame A frame sometimes called a picture contains all the information required for a complete picture For inter laced scan systems there are two fields in a frame Front Porch The portion of the video signal between the end of active picture time and the leading edge of horizontal sync Gamma NTSC Since picture monitors have a non lin ear relationship between the input voltage and brightness the signal must be correspondingly predistorted Gamma correc tion is always done at the source camera in television systems the and B signals are converted to R y G y and B y Values of about 2 2 are typically used for gamma Gamma PAL Since picture monitors have a non linear relationship between the input voltage and brightness the signal must be correspondingly predistorted Gamma correc tion is always done at the source camera in television systems the and B signals are converted to R y G y and Values for gamma range from 2 2 to 2 8 1740A 1750A Series Waveform Vector Monitor User Manual Glossary Gen Lock
30. m 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 m The remote input is enabled by a TTL low or switch to ground See page B 1 REFERENCE Dual Standard Only m NTSC external reference and PAL external refer ence can be set to EXT A A1 A2 A3 B B1 B2 or B3 When The front panel REF EXT is selected LED lights the instrument uses the rear panel EXT REF input Dual standard monitors can be configured for two external references one for NTSC and one for PAL Any of the input channels can be designated as a second external reference by selecting that input channel as the NTSC EXT REF or PAL EXT REF through this menu If NTSC and PAL external references are configured the same the monitor automatically operates in the same television standard as the EXT REF input When NTSC and PAL external references are configured differently the monitor s operating standard is determined by the standard of the dis played video instead of the EXT REF input Once the operating standard is determined the monitor immediately switches to the appropriate input for reference timing 1740A 1750A Series Waveform Vector Monitor User Manual 3 23 Using the Menus
31. rotation x02 0 236 inch 6 mm from center 1740A 1750A Series Waveform Vector Monitor User Manual A 9 Appendix A Performance Specification Table A 8 Audio Mode CATEGORY Input Input Impedance Full Scale Selection Full Scale Accuracy Maximum Input Voltage Bandwidth 3 dB X amp Y Input Phase Matching Table A 9 Time Code CATEGORY Input Input Impedance Input Amplitude Maximum Input Voltage Bandwidth 3 dB A 10 DESCRIPTION Req RI DC coupled differential input 20kQ 0 4 8 amp 12 dBm full scale Menu se lected 0 5 dB Measured at 1 kHz 8 peak Measured to chassis ground Reg 3 dB 2200 0 kHz Req x1 RI Measured at 20 kHz DESCRIPTION RI Longitudinal Time Code DC coupled differential input 20 0 4 8 amp 12 dBm full scale Menu selectable for 140 IRE 1 0 V deflection 10V to 10 V peak gt 200 0 kHz 1740A 1750A Series Waveform Vector Monitor User Manual Appendix A Performance Specification Table A 10 SCH Phase Mode 1750 Only CATEGORY DESCRIPTION Absolute Accuracy Req lt 5 Applies over a temperature range of 0 50 C RI Calibrated at 25 C 3 dB input amplitude Typically x 5 with 6 dB input amplitude Relative Accuracy 2 Acquisition Time lt 1 Second Displayed Phase Error Caused 1 25 by CRT Geometr
32. 0 Left Center Right Figure 3 2 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 m When voltage cursors are selected VOLT the left bezel control is used to adjust the vertical position of the first voltage cursor and the center bezel control adjusts the second voltage cursor The right bezel control is used to move the vertical position of both cursors vertically in tandem The readout AV shows the voltage difference positive or negative between the two cursor positions up to four signifi cant digits 1740A 1750A Series Waveform Vector Monitor User Manual 3 9 Using the Menus 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 AT shows the time difference positive or negative between the two cursor positions up to four significant digits m When markers are selected MARK the left bezel control is used to adjust the horizontal position of the first marker line the center bezel control adjusts the second marker and right bezel control adjusts the third mark
33. 0A Series Waveform Vector Monitor User Manual iii General Safety Summary iy 1740A 1750A Series Waveform Vector Monitor User Manual TABLE OF CONTENTS Introduction Product Description 1 1 Features veer ae tos Relea tae 1 2 dead aw eas 1 5 Power Cord Options 1 5 CRT Options renim percer pel ge thaws 1 6 Accessories ess lise y ER A Y Ya 1 7 Standard Accessories 1 7 Optional Accessories 1 7 Field Upgrade Kits 1 8 Installation crosan Ep IR 1 9 Repackaging for Shipment 1 9 Electrical Installation 1 10 Mains Frequency and Voltage Range 1 11 Remote Connector 1 11 RS232 Connector 1 11 Mechanical Installation 1 12 Cabinets 1 12 Custom Installation 1 12 Rackmounting 1 13 Instrument Configuration 1 15 AbA Glance eost era era 2 1 Front Panel Controls 2 1 Rear Panel Connectors 2 8 Operator s Checkout Procedure 2 12 Required 2 12 Initial Equipment Connections 2 12 Procedure 2 3 2 ua uke ats 2 13 1740A 1750A Series Waveform Vector Monitor User Manual
34. 0A Series internal calibrator can be used to check instrument calibration Select CH A input and set the generator for NTSC Color Bars output Enter the configuration menu and select CALIBRATE Turn on the calibrator signal and note that the amplitude is 140 IRE 1 0 V PAL with one cycle per division See Figure 2 6 Select VECTOR display mode Note that the calibrator signal overlays the compass rose Return to WAVEFORM display mode Exit the configuration menu Note that the calibrator signal is automatically turned off For more information on using the calibrator signal see page 3 21 and page 4 17 1740A 1750A Series Waveform Vector Monitor User Manual 2 13 Operator s Checkout Procedure Tek _ EX pu 10pS DIV 108 E np pam m En gt n 80 4 1 1 1 SS 60 YL 2 35V I b 40 75 100 B 20 2 EA EE 200 IT Icy m x G 40 m _jV NTSCEH HPAL Figure 2 6 Calibrator display 2 14 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 ampl
35. 1 Initialize the Front Panel Controls Enter the PRESET menu and select FACTORY Press the bezel button corresponding to RECALL The front panel controls are now set to the factory preset described on page 3 16 and the PRESET menu is automatically exited Notice that the instrument is in the WAVEFORM display mode with the CH A INPUT displayed in two line sweep 2 Adjust the Display Use the VERT POS and HORIZ POS controls to center the display 1740A 1750A Series Waveform Vector Monitor User Manual Operator s Checkout Procedure Enter the CRT menu DISPLAY will be outlined Adjust the bezel controls for optimum focus graticule scale illumina tion 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 Check that CH A 1 CH A2 and CH A3 inputs are selected The CH A signal should appear on the left side of the CRT Move the generator signal and EXT REF cable to 1 The display should move to the right Repeat this step until the signal is connected to CH A3 and the display is at the far right hand side of the screen Change the input selections to CH B CH B1 CH B2 and CH B3 Repeat the process of moving the generator signal 4 Check Gain The 1740A 175
36. 1740A 1750A Series Waveform Vector Monitor User Manual 1 7 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 1700200 but has feet carrying handle flips tand 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 1700F06 Blank Panel If only one section of a 1700F05 is used the 1700F06 Blank Panel can be inserted in the unused section to improve appearance and air flow 1700F07 Utility Drawer When only one side of a 1700505 is used this utility drawer can be installed in the unused section to provide storage The drawer opens and closes freely unless latched for transport Ordering These 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 Field Upgrade Kits Installation Cabinet installation instructions begin on page 1 12 Dimensional drawings are also shipped with each cabinet For more information contact a Tektronix field office or distributor 1 8 1740A 1750A Series Waveform Vector Monitor User Manual Installation Unpacking Save the shipping carto
37. 40A 1750A Series Waveform Vector Monitor User Manual 4 1 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 compo nent 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 This scale is designed for use with two line or two field sweep rates The graticules are also marked for K Factor tolerances and linear distortion measurements These measurements will be described later in this section K Factor Audio X 100 White 75 White o Level Level len Besen 8 2 7 40 pem 20 8 ort Baseline N A i Setup i No 2 AMA Sync Tip 40 MID 2 3 Figure 4 1 NTSC waveform vector graticule 4 2 1740A 1750A Series Waveform Vector Monitor User Manual 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 toler ances and linear distortion measurements These measure ments will be described later in t
38. AL GROUND DCR DCE READY RTS REQUEST TO SEND CTS CLEAR TO SEND NOT CONNECTED 1 2 3 4 5 6 7 8 9 Figure B 3 Rear panel RS232 connector NOTE The function of the RS232 connector may not be supported at the time of this printing The RS232 interface is used during an upgrade of the instru ment software Contact Tektronix for information on availability of software upgrades and RS232 remote control commands 1740A 1750A Series Waveform Vector Monitor User Manual B 5 Appendix B Remote Connectors B 6 1740A 1750A Series Waveform Vector Monitor User Manual 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 The interval between filter cleaning or replacement is determined by the operating environment To remove the filter take out the two screws that fasten the housing to the rear panel Remove the filter and wash it in a mild detergent and water solution Place cleaned and dried filter or new filter in the housing and replace housing over the fan Replace and tighten the two screws 8 in 165 The filter part number is shown
39. AL system obtained by subtracting luminance Y from the blue camera signal B Chrominance Chrominance refers to the color informa tion in a television picture Chrominance can be further broken down into two properties of color hue and satura tion Chrominance Signal The high frequency portion of the video signal which is obtained by quadrature amplitude modulation of a 3 58 MHz NTSC or 4 43 MHz PAL subcarrier with R Y and B Y information Color Black See Black Burst 1740A 1750A Series Waveform Vector Monitor User Manual 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 I and 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 For example R G and B or Y R Y and B Y Composite Video A single video signal containing all of the necessary information to reproduce a color picture Created by adding quadrature amplitude modulated R Y and B Y to the luminance signal for NTSC systems or U and V to the luminance signal for PAL systems CW Continuous Wave Refers to a separate subcarrier sine wave used for synchronization of chrominance information dB Decibel A d
40. Australia 240 10 Power Cord Option A4 Power North America 250V 10 A Power Cord Option A5 Power Swiss 240 V 6 A Power Cord 1740A 1750A Series Waveform Vector Monitor User Manual 1 5 Options CRT Options The standard instrument is shipped with a P31 green phosphor CRT installed If Option 74 is ordered the instru ment 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 1 6 1740A 1750A Series Waveform Vector Monitor User Manual Accessories Standard Accessories These accessories are included with the product 1 Manual user 1740A 1750A Series 070 8470 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 2A 250V fast blow 159 0021 00 4 Lightbulbs graticule scale 150 0168 00 See page C 1 for replacement instructions 4 Airfilters fan 378 0335 00 See page C 1 for replacement instructions This accessory is installed on the product 1 CRT filter smoke gray 378 0258 00 Optional Accessories 1 Manual service 1740A 1750A 1760 Series 070 8469 Note To receive a service manual please complete and mail the Business Reply Card included with this manual Camera C9 Option 20 Viewing Hood 016 0475 00 Front Panel Cover 200 3897 01
41. CRT C 4 the instrument C 4 Clear menu 2 8 Color framing 3 2 Component signals 4 3 Configure menu 3 18 calibrate 3 21 reference 3 23 remote 3 23 standard NTSC PAL 3 20 vector 3 18 Connectors rear panel 2 8 Controls front panel 2 1 Coupling AC DC 3 18 CRT filter part number 1 7 filter replacement C 5 menu 3 24 options 1 6 CRT Display Specification A 11 Cursor menu 3 8 D DC restorer 2 5 slow or fast 3 18 Differential gain measurements 4 9 Differential phase measurements 4 9 Differentiated step filter 3 7 1740A 1750A Series Waveform Vector Monitor User Manual 1 1 Index Dimensions A 13 Display modes 2 5 3 1 Dual standard graticule 4 8 E Electrical installation 1 10 Electrical specification A 2 Environmental Characteristics Specifica tion A 12 External horizontal 3 23 External Reference Specification A 5 External reference 2 6 2 8 configure 3 23 for dual standard monitors 3 23 F Factory preset 3 16 Fan filter cleaning or replacing C 1 part number 1 7 Field sweeps 2 5 Field upgrade kits 1 8 Filter air see fan filter 1 7 Filtering 3 7 Focus 3 24 Front panel illustration 2 3 Front panel controls 2 1 ir cover optional accessory Fuse part number 1 7 replacing C 1 G Gain adjustment 4 17 menu 3 24 reset 3 22 X1 X5 X10 3 24 Graticule illumination 3 24 vector 4 7 waveform 4 1 Graticule lights part number 1 7 r
42. D Software Version Table D 1 Software Releases Continued 1 04 JAN 1993 1740 41A M78914 Product enhancement to coincide with 1750 51A the release of dual standard monitors B010729 Not sent for field upgrade 1745 55A e Remote sync changed to positive B010100 edge trigger CONFIG REFERENCE menu now avail only for dual standard monitors A123 B123 Follow selection deleted replaced with A123 B123 Composite Component selections in CONFIG IN PUT menu Dual standard monitors When NTSC amp PAL ext ref s are set the same and EXT REF is selected the ext ref channel is used to determine the video standard When NTSC amp PAL ext ref s differ the dis played video channel determines the video standard APR 1993 B011760 M79283 Added Vector cursors and markers and modified the operation of the A123 B123 INPUT buttons OCT 1993 New features On screen field sweep in dication Configure menu selection for RGB Parade display Audio amp Time Code unit of measure changed to dBu On screen pointer to left or right side grati cule for dual standard Limited the 1 of 4 and 1 of 8 line select menu entries to instruments with SC H function only D 2 1740A 1750A Series Waveform Vector Monitor User Manual Glossary Glossary AC Coupled A connection which removes the constant voltage DC component on which the signal AC compo nent is riding Usually implemented by passing the signal through a capacitor AP
43. DE mode the LINE FIELD button becomes a two way switch toggling be tween line and field The sweep rate is displayed in the upper right corner of the CRT for field rate sweeps 1F or 2F is displayed The MAG button is used with LINE FIELD to provide horizontal magnification of each rate as follows m One line magnified 200 ns division m Two line magnified 1 us division m One field or two field magnified approximately X20 magnification 3 4 1740A 1750A Series Waveform Vector Monitor User Manual 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 Ac tual selections appear in STANDARD text with the present selection outlined Use the five buttons along the right side of the CRT referred to as bezel buttons to change the selec tions The center three controls under the CRT are referred to as Left Center and Right bezel controls Control functions vary with menu choice a readout just above each active con trol shows its present function These controls are used as variable analog controls to
44. Electrical Parts List Diagrams Mechanical Parts List xii 1740A 1750A Series Waveform Vector Monitor User Manual Preface 1750A Waveform Vector Monitor 1740A 1750A Series Waveform Vector Monitor User Manual xiii Preface Contacting Tektronix Product Support Service Support For other information To write us Website xiv For questions about using Tektronix measurement products call toll free in North America 1 800 TEK WIDE 1 800 835 9433 ext 2400 6 00 a m 5 00 p m Pacific time Or contact us by e mail tm app supp Gtek com For product support outside of North America contact your local Tektronix distributor or sales office Tektronix offers extended warranty and calibration programs as options on many products Contact your local Tektronix distributor or sales office For a listing of worldwide service centers visit our web site In North America 1 800 TEK WIDE 1 800 835 9433 An operator will direct your call Tektronix Inc P O Box 1000 Wilsonville OR 97070 1000 USA Tektronix com 1740A 1750A Series Waveform Vector Monitor User Manual 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 func tions the 1750A Series provides the same functions with SCH measurement capabilities added The following products are availabl
45. L Average Picture Level The average signal level with respect to blanking during active picture time ex pressed as a percentage of the difference between the blank ing and reference white levels Back Porch The portion of the video signal which lies between the trailing edge of the horizontal sync pulse and the start of the active picture time Burst is located on back porch Bandwidth The range of frequencies over which signal amplitude remains constant within some limit as it is passed through a system Baseband Refers to the composite video signal as it exists before modulating the picture carrier Composite video distributed throughout a studio and used for recording is at baseband Black Burst NTSC Also called color black black burst is a composite video signal consisting of all horizontal and vertical synchronization information burst and usually setup Typically used as the house reference synchronization signal in television facilities Black Burst PAL Also called color black black burst is a composite video signal consisting of all horizontal and vertical synchronization information and burst Typical ly used as the house reference synchronization signal in television facilities Blanking Level Refers to the 0 IRE level for NTSC systems 0 3 volt level with respect to sync tip for PAL systems which exists before and after horizontal sync and during the vertical interval 1740A 1750A Series Wavefor
46. LTIPLE allows simultaneous selection of multiple DISPLAY modes SWEEP Sweep buttons are used to select the waveform sweep rate W LINE FIELD sequences through four sweep rate selections one line two line one field and two field m MAG turns on the sweep magnifier See page 3 4 DC REST RESTORE turns DC Restorer on or off The DC Restorer speed and clamp point are selected through the CONFIGURE menu shown on page 3 18 1740A 1750A Series Waveform Vector Monitor User Manual 2 5 At A Glance REF EXT 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 INPUT Selecting a front panel input causes the signal that is input to the corresponding rear panel connector to be displayed on screen Without PARADE or OVERLAY selected only one input selection can be made at a time Each input channel button including A123 B123 toggles between A and B and is cancelled when another input button is pressed With PARADE or OVERLAY selected multiple input selections can be made input buttons select A B both or off and do not cancel each other A123 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 Selecting A1230r B123 turns off all other
47. NTSC PAL 1 1 3 20 Standard accessories 1 7 Standby mode 1 10 2 1 Stereo audio measurements 4 15 Store presets 3 17 Subcarrier to horizontal phase 3 2 Sweep rates 4 1 Selecting 2 5 3 4 Sync jitter 3 2 Sync tip 3 18 T Television standard NTSC PAL 1 1 3 20 Test mode 3 18 Time Code Specification A 10 Time code display 2 5 3 3 4 16 Timing cursors 3 9 Trace rotation 3 24 U Utility drawer optional accessory 1 8 V Vector display 2 5 3 1 Vector graticule 4 7 Vector markers 3 8 Vector Mode Specification A 8 Vertical Deflection Specification A 2 Vertical position control 2 5 Viewing hood optional accessory 1 7 Voltage cursors 3 9 W Waveform cursors 3 9 Waveform display 2 5 3 1 Waveform graticule 4 1 Waveform Horizontal Deflection Specifica tion A 6 Waveform markers 3 9 Waveform Vertical Deflection Specifica tion A 3 1 4 1740A 1750A Series Waveform Vector Monitor User Manual Weight A 14 White phosphor 1 6 1740A 1750A Series Waveform Vector Monitor User Manual Index 1 5 Index 6 1740A 1750A Series Waveform Vector Monitor User Manual
48. TNING or DIAMOND The present selection will be dis played when the front panel LIGHTNING button is pressed 1740A 1750A Series Waveform Vector Monitor User Manual 3 19 Using the Menus 3 20 Table 3 1 Valid FORMAT selections FORMAT BARS 21 525 60 75 100 625 50 75 100 GBR SMPTE EBU BETA 1 75 or 100 Bars selected through CONFIG VECTOR menu 2 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 3 is identical to SMPTE EBU 625 50 STANDARD m CONFIG STANDARPD allows the user to set the cursor unit of measure to MV IRE or AUTO When AUTO is selected cursor units are automatically changed to IRE when operating in the NTSC standard and MV when operating in the PAL standard m Fordual standard instruments a menu selection of NTSC PAL or AUTO standard is also available When AUTO is selected the operating standard is changes automatically to match the standard of the displayed input signal A circled A precedes NTSC or PAL on the readout 1740A 1750A Series Waveform Vector Monitor User Manual Using the Menus OFFSET m 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
49. 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 informa tion on a waveform monitor or vectorscope display Grati cules 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 Horizontal Blanking Horizontal blanking is the entire time between the end of the active picture time of one line and the beginning of active picture time of the next line It extends from the start of front porch to the end of back porch Horizontal Sync Horizontal sync is the 40 IRE pulse in NTSC systems 300 mV pulse for PAL systems occurring at the beginning of each line This pulse signals the picture monitor to go back to the left side of the screen and trace another horizontal line of picture information Hue Hue is the property of color which allows us to distin guish between colors such as red yellow purple etc Hum Hum refers to the undesirable coupling of the 60 Hz power sine wave for NTSC systems 50 Hz power sine wave in PAL systems into other electrical signals ITS PAL Insertion Test Signal A test signal which is inserted in one line of the vertical interval to facilitate in service testing IRE NTSC A unit equal to 1 140 of the peak to peak ampl
50. User Manual Tektronix P4 1740A 1750A Series Waveform Vector Monitor 070 8470 05 This document supports firmware version 2 2 and above ce 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 Tektronix Inc Box 1000 Wilsonville OR 97070 1000 TEKTRONIX and TEK are registered trademarks of Tektronix Inc WARRANTY Tektronix warrants that the products that it manufactures and sells will be free from defects in materials and workmanship for a period of three 3 years from the date of shipment If a product proves defective during this warranty period Tektronix at its option either will repair the defective product without charge for parts and labor or will provide a replacement in exchange for the defective product In order to obtain service under this warranty Customer must notify Tektronix of the defect before the expiration of the warranty period and make suitable arrangements for the performance of service Customer shall be responsible for packaging and shipping the defective product to the service center designated by Tektronix with shipping charges prepaid Tektronix shall pay for the return of the product to Customer if the shipment is to a location within the country in which the Tektronix se
51. ack side of the bezel Position the ridged side of the filter towards the CRT to eliminate unwanted visual effects on the CRT face 1740A 1750A Series Waveform Vector Monitor User Manual C 5 Appendix C User Service 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 C 6 1740A 1750A Series Waveform Vector Monitor User Manual 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 1 00 SEP 1992 1740 5 Original software B010100 1 01 zontal is enabled with timing cursors UNCAL is displayed in place of a quantitative readout NOV 1992 1740As Installed in new products not sent for B010458 field upgrade 1750 5 Added AUTO unit of measure selec B010100 tion for CURSORS Added flashing on screen indicator for Gain RESET Line Select NEXT FIELD ALT 2 FIELD and ALT 4 FIELD and all Preset buttons Added SCH R Y filter to 1750A Se ries filter selections When Remote Sync is enabled the on screen TIME DIV is not present When Remote Sync or External Hori 1740A 1750A Series Waveform Vector Monitor User Manual D 1 Appendix
52. ain 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 grati cule 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 To adjust vector gain select VECTOR display mode and push the CONFIG menu button Select CALI BRATE then CAL SIG ON and GAIN CAL ON a Adjust VECT CAL so that the calibration signal circle falls on the compass rose outer ring b Pushing RESET VEC CAL will cancel any gain adjustment and reinstate the factory gain setting 4 18 1740A 1750A Series Waveform Vector Monitor User Manual ONE Appendices 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 The Performance Requirement tolerances listed in the Electrical Specification are doubled over the temperature range of 0 C to 50 C unless otherwise specified
53. also accepts the input signals for external blanking time code stereo L and R audio TTL signal or ground closure to designated pins will enable Staircase External Horizontal or Remote Sync displays Eight front panel setups can also be stored and recalled through the REMOTE connector REMOTE connector pin assignments begin on page B 1 RS232 Connector The rear panel RS232 connector is a 9 pin subminiature D type connector that provides a serial interface for remote control The RS232 pin assignments are given on page B 1 The RS232 interface is not supported at the time of this printing Operational Changes No operational modifications are made to these monitors through internal jumper settings Input coupling DC RE STORER clamp time RGB YRGB selections and other similar configurations are changed through the on screen menu Instrument configuration is described on page 3 18 1740A 1750A Series Waveform Vector Monitor User Manual 1 11 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 Cabinets Do not lift a cabinetized instrument w
54. and VOLTAGE cursors 1740A 1750A Series Waveform Vector Monitor User Manual 3 1 Functional Overview can be activated and positioned for reference or measure ment 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 SCH SCH provides a vector display of the subcarrier to horizontal sync phase relationship The burst vector and the phase of the 50 point of the leading edge of sync are displayed Subcarrier to horizontal phase and color framing are dis played graphically in the polar SCH display Sync jitter over the field is displayed as a moving sync vector dot Correct color framing can be verified by the position of the single sync vector dot relative to the color subcarrier vector when the monitor is externally referenced The SCH phase of the reference signal is separately sensed to allow reliable color framing comparison Using this method of determining relative color framing eliminates the require ment for a precise horizontal timing match between the reference and measured signals An external color field identification input is also required Picture The PICTURE mode allows the operator to verify t
55. anual Table of Contents Remote Operation 3 25 Using Presets through the Remote 3 25 Making Measurements Basic Measurements 4 1 Waveform Graticule 4 1 Horizontal Scale 4 1 NTSC Vertical Scales 4 2 PAL Vertical Scale 4 3 Dual Standard Vertical Scale 4 4 Making Waveform Measurements 4 5 Horizontal Sync Amplitude 4 5 Peak White e 4 5 K Factor Measurements 4 5 Vector Graticule 4 7 Making Vector Measurements 4 9 Chroma Bandwidth 4 9 Differential Phase and Gain 4 9 Making SC H Phase Measurements 4 10 NTSC ulnis sve teas 4 10 PAL PC 4 12 n fantasies eee 4 12 Making Audio Measurements 4 15 Time Code Display 4 16 Calibration uiia o a e ee Ea ee s 4 17 Adjusting Instrument Gain 4 17 1740A 1750A Series Waveform Vector Monitor User Manual vil Table of Contents viii Appendices Appendix A Performance Specifications A 1 1 Electrical Specifications A 2 Certifications and compliances A 13 Appendix B Remote Connectors
56. cardboard piece around the bagged instrument to protect components c Pack dunnage or urethane foam between the instru ment and the carton If using Styrofoam kernels overfill the box and compress by closing the lid There should be three inches of tightly packed cushioning on all sides of the instrument 3 Seal the carton with shipping tape industrial stapler or both Electrical Installation 1 10 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 Systems that have both current carrying conductors live with respect to ground such as phase to phase on multiphase systems are not recommended as power sources A protective ground connection by way of the grounding conductor in the power cord is essential for safe operation NOTE When power is supplied line voltage will be present in the instrument even if the POWER switch is set to STANDBY 1740A 1750A Series Waveform Vector Monitor User Manual Installation 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 connec tor It provides the input for RGB YRGB staircase external horizontal and remote sync It
57. conductive pollution occurs Products in this category are generally encapsulated herrretically sealed or located in clean roorrs Pollution Degree 2 Norrrally only dry nonconductive pollution occurs Occasionally a terrporary conductivity that is caused by condensation must be expected This location is a typical office horre environment condensation occurs only when the product is out of service Pollution Degree 3 Conductive pollution or dry nonconductive pollution that becorres conductive due to condensation These are sheltered locations where neither temperature nor hurridity is controlled The area is protected fromdirect sunshine rain or direct wind Pollution Degree 4 Pollution that generates persistent conductivity through conductive dust rain or snow Typical outdoor locations 1740A 1750A Series Waveform Vector Monitor User Manual Appendix A Performance Specification Table A 15 Certifications and compliances cont CATEGORY STANDARDS OR DESCRIPTION Safety Standards U S Nationally UL1244 Recognized Testing Standard for electrical and electronic measuring and test Laboratory Listing equipment Canad an Certification CANYCSA C22 2 No 231 CSA safety requirements for electrical and electronic measuring and test equipment Low Voltage Directive 73 23 EEC amended by 93 69 EEC EN 61010 1 Safety requirerrents for electrical equipment for rreasurerrert control and laboratory use
58. connec tions and components when power is present Do Not Operate With Suspected Failures If you suspect there is damage to this product have it inspected by qualified service personnel Do Not Operate in Wet Damp Conditions Do Not Operate in an Explosive Atmosphere Keep Product Surfaces Clean and Dry Provide Proper Ventilation Refer to the manual s installa tion instructions for details on installing the product so it has proper ventilation 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 1740A 1750A Series Waveform Vector Monitor User Manual 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 These symbols may appear on the product A A EH CAUTION WARNING Double Protective Refer to High Volt Insu Ground Earth Manual age lated Terminal 99 Not suitable for connection to the public tele communica tions network 1740A 175
59. d 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 us SWEEP REF internal and menus off Push the PRESET menu button to access the on screen menu illustrated in Figure 3 5 Turn the left bezel control to select the PRESET location to be acted on presets 1 9 are available through the menu Next use the bezel button corresponding to the desired action RECALL STORE RENAME or RECOV ER When a bezel button is pushed a box flashes momen tarily around the on screen label to verify that the selection has been made Bezel Buttons Tex 20 ESET9 0000 8 7 Left Center Right Figure 3 5 The PRESET menu display 3 16 1740A 1750A Series Waveform Vector Monitor User Manual Using the Menus Recall Use the left bezel control to select outline a preset for re call Push RECALL to recall the stored instrument configura tion 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 front panel controls are set as desired and use the left bezel con trol to select the storage location shown outlined Push STORE IT to store the current front panel settings at th
60. dard monitors also have the option of choosing NTSC FSC 3 58 MHz or PAL FSC 4 43 MHz 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 m both waveform and vector modes selecting NTSC FSC or PAL FSC temporarily switches the instrument to the appropriate video standard The standard is restored when changing the selection or when exiting the CALIBRATE menu GAIN CAL ON In waveform mode the left bezel control adjusts instrument vertical gain V CAL and the center bezel control adjusts instrument horizontal gain H CAL Once gain has been adjusted two reset options appear on screen If either of these resets is se lected a box flashes momentarily around the on screen label to acknowledge that reset has occurred RESET VCAL cancels any vertical gain adjustments and RESET VCALcancels any vertical gain adjust ments the instrument returns to the factory cali brated gain settings m In vector mode the center bezel control adjusts the vector signal gain Once gain has been adjusted RESET VCAL appears on screen Selecting RESET VCAL cancels any vector gain adjustments and returns the instrument to the factory calibrated gain settings 3 22 1740A 1750A Series Waveform Vector Monitor User Manual Using the Menus REMOTE m currently operating software version is dis played in the lower right corner of the screen
61. e 1740A 1750A NTSC 1741A 1751A PAL 1745A 1755A NTSC PAL dual standard Applications Typical applications for these monitors include video signal monitoring in camera control units VTR bridges production switcher consoles mobile vans and field production systems The 1740A Series is well suited for portable applications where a small lightweight monitor is needed and SCH capability is not required It is appropriate for many VTR bridge applications providing remote control and 90 100 Hz sweeps for D 2 servo observation The 1750A Series is useful in the composite edit suite providing all 1740A Series features plus the Tektronix polar SCH display to match color subcarrier to horizontal sync timing and color framing among edit sources 1740A 1750A Series Waveform Vector Monitor User Manual 1 1 Product Description Features m Composite or Component Waveform Monitoring m Composite Vector Display m Menu Assisted Operation allows expanded feature set W Assignable cursors for time and voltage m Picture monitor mode for verifying signal source m Stereo Audio Display m Longitudinal time code display mode for editing applica tions m SCH and Color Framing Display 1750A Series only m External staircase from a camera control unit can be selected remotely Internal video filters provide specialized measurements with dual or triple filter modes available in PARADE or OVERLAY m Eight video inputs can be
62. e outlined PRESET location Push the bezel button corre sponding to RETURN if storing is not desired This will can cel and exit the STORE operation Rename Selecting RENAME will provide an on screen display assign ing the center and right bezel controls to LOCATION and LET TER Turn the center control to select the letter that will be changed move the box to the desired location within the preset name Turn the right control until the selected letter changes to the desired new letter Push RETURN if renaming is not desired All changes to the name will be cancelled When the change has been made satisfactorily select AC CEPT to store the new name 1740A 1750A Series Waveform Vector Monitor User Manual 3 17 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 selec tion Following are descriptions of each selection INPUT COUPLING Selects AC or DC coupling for rear panel inputs DC RESTORER Selects the clamp speed Slow will clamp while displaying any hum CLAMP Selects the point of the video signal that is clamped to 0 Can be set for ST sync tip or BP back porch A123 and B123 When COMPOSITE is se lected the instrument s internal reference is the input channel currently selected for disp
63. e 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 Use the center control to move the marker around the graticule center point Change CONTROL to 2 Use the bezel controls as for marker 1 Select X5 gain and note that the markers do not move These markers can be used to highlight desired features of the vector graticule Return to WAVEFORM display mode Exit the CURSOR menu then enter the menu again Note that MARK is still selected and marker positions are un changed Exit the menu For more information about using the cursors see page 3 8 8 Filter Selection The 1740A 1750A Series offers several filter selections for the waveform display Ensure that the instrument is operating in waveform mode Enter the FILTER menu FLAT is selected by the factory preset Select LUM filter This provides a low pass filtered display of the luminance portion of the signal See Figure 2 7 Select CHROM This provides a bandpass filtered display of the chrominance portion of the signal See Figure 2 8 Select F L FLAT plus LUM The flat display is superimposed on the luminance filtered display overlay is selected by the factory preset Press the appropriate bezel button not the front panel PARADE button to select parade
64. ecibel is a logarithmic unit used to describe signal ratios For voltages dB 20 Log o V gt DC Coupled A connection configured so that both the signal AC component and the constant voltage on which it is riding DC component are passed through DC Restorer A circuit used in picture monitors and waveform monitors to clamp one point of the waveform to a fixed DC level Demodulator In general this term refers to any device which recovers the original signal after it has modulated a high frequency carrier In television it may refer to 1 An instrument such as a TEKTRONIX 1450 which takes video in its transmitted form modulated onto the picture carrier and converts it to baseband 2 The circuits which recover R Y and B Y for NTSC systems or U and V for PAL systems from the composite signal 1740A 1750A Series Waveform Vector Monitor User Manual G 3 Glossary Distortion If a sine wave of a single frequency is put into a system and harmonic content at multiples of that frequen cy appears at the output there is harmonic distortion present in the system Harmonic distortion is caused by non lineari ties 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 Field In interlaced scan systems the information for one picture
65. ed camera signal Saturation The property of color which relates to the amount of white light in the color Highly saturated colors are vivid while less saturated colors have more white mixed in and therefore appear pastel For example red is highly saturated while pink is the same hue but much less satura ted In signal terms saturation is determined by the ratio between luminance level and chrominance amplitude It should be noted that a vectorscope does not display saturation the length of the vectors represents chrominance amplitude In order to verify that the saturation of the colors in a color bar signal is correct you must check luminance amplitudes with a waveform monitor in addition to observing the vectors SCH The timing relationship between the horizontal sync pulses and the zero crossings of the reference subcarrier burst Setup In NTSC systems video black is typically 7 5 IRE above the blanking level This 7 5 IRE level is referred to as the black setup level or simply as setup 1740A 1750A Series Waveform Vector Monitor User Manual G 7 Glossary Subcarrier The modulation sidebands of the color subcar rier contain R Y V and 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 o
66. elative 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 grati cule The NTSC and PAL vector graticules contain burst and vec tor targets the dual standard graticules contain burst and vector targets for both NTSC and PAL standards The vector targets can be used with either 75 or 100 amplitude color bar signals The selection is made through the CONFIG VEC TOR menu described on page 3 18 NTSC 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 4 4 The dimen sions of the large boxes represent 10 centered on the ex act chrominance phase and 20 of chrominance amplitude centered around standard amplitude The dimen sions of the smaller boxes represent 2 5 and 2 5 IRE 1740A 1750A Series Waveform Vector Monitor User Manual 4 7 Basic Measurements 20 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 ampl
67. eplacement C 2 H HAD bar 4 5 Horizontal Deflection Specification A 6 Input channels 2 6 3 3 Input connectors 2 8 Input coupling 3 18 Installation 1 9 electrical 1 10 mechanical 1 12 remote connector 1 11 Intensity adjustment 1 15 3 24 K K factor measurements 4 5 L Light bulbs part number 1 7 Line select menu 3 14 Line Field selection 2 5 Lissajous waveform 4 15 Luminance filter 3 7 I 2 1740A 1750A Series Waveform Vector Monitor User Manual M Magnifier 2 5 3 4 Mains frequency 1 11 Manual part numbers 1 7 Markers 3 9 Measurement Cursors Specification A 7 Measurements 4 1 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 12 Menu clear menu 2 8 3 6 configure 2 7 3 18 CRT 2 7 3 24 cursor 2 7 3 8 filter 2 7 3 7 gain 2 7 3 24 line select 2 7 3 14 multiple menu displays 3 5 preset 2 7 3 16 using the menus 3 5 Multiple display 2 5 3 3 Multi use controls 2 2 O Offsets enable 3 21 Operating standard 1 1 3 20 Operating voltage 1 11 Optional accessories 1 7 Options 1 5 Ordering accessories 1 8 Index Overlay mode 2 7 3 4 P Packaging for shipment 1 9 Parade mode 2 6 3 4 Performance specification A 3 Physical Characteristics Specification A 14 Picture display 2 5 3 2 Pi
68. er m When both voltage and timing cursors are selected V T a control assignment appears on the screen The bezel button is used to assign the control to voltage or timing cursors The bezel controls work the same as for the individual timing and voltage cursor modes Both voltage and timing readouts are present VOLT2 TRACK B Left Center Right Figure 3 3 The WAVEFORM CURSOR menu 3 10 1740A 1750A Series Waveform Vector Monitor User Manual Using the Menus Voltage Cursor 1 WFM CURSOR VOLT TIME Voltage Cursor 2 CONTROL Timing Cursor 1 TIME Timing Cursor 2 Figure 3 4 The VECTOR WFM CURSOR menu with V T selected Vector Waveform Multiple If MULTIPLE is pressed and both VECTOR and WAVEFORM dis plays are selected menus for all cursor types will be dis played See Figure 3 4 All cursor functions are available in this mode the top three bezel buttons are self cancelling Bezel control assignments are the same as for the individual modes Using the Cursors With Vector Display Vector cursors are available when a composite vector display is selected To use vector cursors operate in VECTOR or VEC TOR WAVEFORM mode and press the CURSOR MENU button 1740A 1750A Series Waveform Vector Monitor User Manual 3 11 Using the Menus 3 12 There are t
69. er 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 Select 2 FIELD sweep and note the intensified line in each field Select 15H and note that 15 lines are now intensified in each field intensified portion appears wider The readout is now ALL 131 145 See Figure 2 13 2 20 1740A 1750A Series Waveform Vector Monitor User Manual Operator s Checkout Procedure 1H Figure 2 13 Line Select display with 15H selected in 2 FIELD sweep Select 1 of 2 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 1750 Series only Note that the displays appear in the order listed here Exit the line select menu Enter the menu again and note that the user settings are saved Exit the menu 10 Vectorscope Display Select VECTOR display mode Adjust the right bezel control to place the burst vector on the 180 graticule line The display should appear similar to Figure 2 14 11 Picture Monitor Display Select PICTURE display mode A picture monitor display of the selected input signal appears This can be used to visual ly identify the signal source See Figure 2 15
70. evel 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 Peak White With the blanking signal level on the graticule baseline the amplitude of the 100 white reference of a color bar should be on the 100 IRE 1 V graticule line With a 2 LINE sweep rate use the HORIZ POS control to place the white reference directly over the amplitude scale at graticule center The vertical markings there correspond to 2 IRE division 10 mV division for PAL Measure peak white directly from the graticule or use the voltage cursors K Factor Measurements The boxed area in the upper left corner of the graticule is scaled for 2 and 4 K Factor ratings for precise tilt mea surements This structure is designed to work with an 8 us half amplitude duration HAD bar The bar tilt measure ment structure can also be used to measure pulse to bar ratio Calibrated X5 GAIN can be used while making these measure ments it increases resolution to 0 4 and 0 8 To use the NTSC vertical scale to make line time distortion and pulse to bar ratio measurements position the signal blanking level to the graticule baseline Next position the center of the composite test signal bar to the center of the 2T bar measurement box and check to see if insertion gain is unity If it is not adjust the VARIABLE GAIN enabled fr
71. f these markers Markers are designed to be used for reference points there is no quantitative readout Markers are posi tioned with respect to the graticule and are not moved or re sized with the signal When CLEAR MENU is pressed all of the marker readout ex cept the boxes will be removed The readout will be restored when CURSOR menu is selected again When CURSOR menu is exited and re entered the selected cursor quantity and position will be retained One use of markers is to position them on the vector target boxes Adjust the signal source until the color bar signal appears in the marker boxes 1740A 1750A Series Waveform Vector Monitor User Manual Using the Menus If it becomes necessary to compensate for minor shifting of markers due to drift or external magnetic fields particularly 1f 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 ampli tude measurements With VOLT selected use the left bezel control to position the VOLT1 cursor at the upper excursion of signal to be measured and the center bezel control to posi tion the VOLT2 cursor at the lower excursion The on screen readout gives the voltage difference between the two levels W
72. he signal source In PICTURE mode with LINE SELECT on a bright up marker identifies the selected line in the picture 3 2 1740A 1750A Series Waveform Vector Monitor User Manual 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 Synchroniza tion 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 With MULTIPLE selected the SCH AUDIO switch sequences through SCH AUDIO and both If waveform or vector is also selected the switch will also sequence to OFF At least one mode must be on at all times When exiting MULTIPLE the instrument will return to the previous non MULTIPLE display settings When entering MULTIPLE again the previous MULTIPLE display settings will be restored Displaying a Signal Inputs There are eight rear panel loop through inputs which may eliminate the need for an external routing switcher The in puts can be displayed singly or in combination Without PARADE or OVERLAY selected only one input selec tion can be made at a time Each input channel button in cluding A123 B123 toggles between A and B and i
73. hen GAIN is changed the voltage cursors maintain their relationship with the signal For example if the VOLT2 cursor were set to the signal sync tip in X1 GAIN it would also be at sync tip in X5 gain X10 gain or with VAR gain on Timing Cursors can be used to make accurate time measure ments When TIME is selected position the TIME1 cursor at the left excursion of the signal to be measured and the TIME2 cursor on the right The on screen readout gives the time difference between the two points When MAG is selected the timing cursors maintain their rela tionship with the signal For example if the VOLT1 cursor were set to the rising edge of sync it would also be set there with MAG selected Markers When MARK is selected use the bezel controls to vertically position the markers where desired with respect to the graticule markings These markers are designed to be used for reference points there is no amplitude readout The markers are not affected by GAIN changes if a marker were set to 100 IRE in X1 GAIN it would still be set to 100 IRE with the MAG on 1740A 1750A Series Waveform Vector Monitor User Manual 3 13 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 FIELD ALL or 10f 2 1H or 15H
74. his section Component signals can be centered on the 35 V line Audi K Factor udio 100 White Level Baseline Sync Tip 3V Figure 4 2 PAL waveform vector graticule 1740A 1750A Series Waveform Vector Monitor User Manual 4 3 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 Audio K Factor ______ eh a A mee Lo E N 100 White a f Level 75 White Level h 2 ie 40 fe jan PME ER EC 0 ze Setup EN N A 7 A Z Sync Tip SX amp Tire Ons 7 x Nee 7 40 r 24 H ERES NTSCEH SSS a NTSC Scale PAL Scale Figure 4 3 Dual Standard waveform vector graticule 4 4 1740A 1750A Series Waveform Vector Monitor User Manual 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 l
75. i tude centered around 100 standard amplitude The dimen sions of the inner target show 3 and 5 of chrominance amplitude the vectors associated with the V burst terminate in the smaller targets Dual Standard The 1745 and 1755 graticule is a composite of the PAL and NTSC graticules There are two inner targets within the larger target the PAL target and the NTSC target The NTSC target is inside the PAL target 1740A 1750A Series Waveform Vector Monitor User Manual Basic Measurements Making Vector Measurements Chroma Bandwidth The horizontal and vertical axes of the vector graticule contain markings for checking chroma bandwidth A subcar rier frequency sine wave whose amplitude places it on the outer compass rose is used as a reference When the fre quency 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 This calibration aid makes it possible to check the 3 dB points of the demodula tor output amplifiers Differential Phase and Gain Differential gain dG and differential phase d measure ments use the graticule markings located at the outer edge of the B Y or U axis See Figure 4 5 109 do 24 lt 10 dG 20 dG Figure 4 5 Differential Gain and Phase Measurements 1740A 1750A Series Waveform Vector Monitor User Manual 4 9 Basic Measurements Making SC H Phase Measurements
76. iature D type connector which uses TTL signal or ground closures to provide remote control of many front panel functions For more information see page 3 25 and page B 1 W RS232is a 9 pin subminiature D type connector that provides a serial interface for remote control The RS232 interface is not supported at the time of this writing Fuse Theinstrument s mains fuse should be replaced only with a 250V 2A F type cartridge fuse A replace ment fuse is included with the instrument AC Power m 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 Four replacement air filters for the fan are included with the instrument Refer to page C 1 for replace ment and cleaning instructions 1740A 1750A Series Waveform Vector Monitor User Manual 2 9 At A Glance N i 7 68654 YL ALOWAY Sz 9 6 OOOOO er S aNnou9 HLYVA OL Q3193NNOO 39 LSNW HOLINANOI SNIGNNOYSD AN LOALOYd 93095 H3MOd MOOHS 1991819573 GIOAV OL ONINHVM MAOZ SIY H3NI3PI ONANNYdSONNSINNATHOS 38 25398 GNSHOIYSNY ZH 09 0S 09 06 XVIN OLL 1740A 1750A Series Rear Panel Figure 2 4 1740A 1750A Series Waveform Vector Monitor User Manual 2 10 Operator s Checkout Procedure
77. ies Waveform Vector Monitor User Manual 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 1740A 1750A Series Waveform Vector Monitor User Manual G 9 Glossary G 10 1740A 1750A Series Waveform Vector Monitor User Manual i ee Index A A123 B123 2 6 3 4 Accessories 1 7 field upgrade kits 1 8 incoming inspection list 1 9 optional 1 7 standard included 1 7 Air filters replacement 1 7 Audio display 2 5 3 2 Audio measurements 4 15 Audio Mode Specification A 10 Auto cursor units 3 20 television standard 3 20 B Back porch 3 18 Bezel buttons 2 2 Bezel controls 2 2 Blank panel optional accessory 1 8 BNC inputs 2 8 C Cabinets optional accessories installation 1 12 part numbers 1 8 Calibrator Specification A 8 Calibrator signal frequency 3 22 Camera optional accessory 1 7 Carrying case optional accessory 1 8 Index Certifications A 13 Compliances A 13 Chroma bandwidth measurements 3 7 Clamp point 3 18 Cleaning air filter fan filter C 1 the
78. ified again Select variable gain and use the right bezel control to adjust the gain to the minimum and maximum settings Exit the GAIN menu then enter it again Note that the vari able and X10 gain settings are restored Exit the GAIN menu Adjust the VERT POS control to place the signal on baseline 6 Select Timing Reference The factory preset selects a two line sweep Note that pressing the LINE BUTTON button will cycle through four selections one line two line one field and two field sweeps Return to the two line sweep 1740A 1750A Series Waveform Vector Monitor User Manual Operator s Checkout Procedure Press the MAG button The MAG indicator lights and a 1 uS 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 The voltage cursors appear as two dashed horizontal lines cursor 1 has single dashes and cursor 2 has double dashes Use the left and center bezel controls to adjust the cursors individually or the right control to move both cursors by the same amount TRACK The voltage difference between the cursors is displayed as AV Align a voltage cursor with a signal refer ence point a
79. in 19 recalls setup frompreset 3 Grounding pins 19 and 25 stores current setup at preset 3 Grounding pin 20 recalls setup frompreset 4 Grounding pins 20 and 25 stores current setup at preset 4 Grounding pin 21 recalls setup frompreset 5 Grounding pins 21 and 25 stores current setup at preset 5 Grounding this pin along with one of the Preset pins stores the cur rent front pane setup at the se lected Preset location 1740A 1750A Series Waveform Vector Monitor User Manual B 3 Appendix B Remote Connectors Remote Connector Converter When the 1740A 1750A Series is used as a direct replace ment for 1740 Series or 1750 5 instrument construct an adapter or rewire the remote cable according to Figure B 2 1740A 1750A Series Rear Panel REMOTE Connector Remote Plug 1 RGB INPUT 3 RGB ENABLE REMOTE SYNC IN 5 6 GROUND REMOTE SYNC ENABLE Figure B 2 REMOTE adapter for 1740 1750 Series replacement B 4 1740A 1750A Series Waveform Vector Monitor User Manual 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 du plex The data rate is selectable through the Configure menu for either 1200 4800 or 9600 baud data type is asynchro nous Figure B 3 shows the pin assignments PIN DATA NUMBER CONNECTION DCD RXD RECEIVED DATA TXD TRANSMITTED DATA DTR DTE READY SIGN
80. input channels When PARADE or OVERLAY 1s selected A123 and B123 can be dis played together and in combination with other inputs PARADE PARADE displays up to four input channels side by side with any additional inputs overlaid Selecting PARADE displays the input channel s last selected 1740A 1750A Series Waveform Vector Monitor User Manual MENU At A Glance for PARADE allowing a custom configuration of inputs In PARADE mode the LINE FIELD button offers only two choices one line and one field OVERLAY OVERLAY provides an overlaid display of all se lected inputs 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 FILTER allows choice of flat or filtered display of the waveform signal CURSOR enables timing cursors voltage cursors and markers for the waveform display Polar cursors and markers are available for the vector display LIN SEL allows the selection of a single line or group of lines for display PRESET allows the user to store and recall up to 9 front panel setups One additional recall is factory pre programmed Presets one through eight can also be accessed remotely CONFIG allows the user to configure several operat ing parameters such as input coupling dc restorer speed and internal reference designation GAIN provides selection
81. is set from the GAIN menu when AUDIO display is selected Gain choices are 0 dBu 4 dBu 8 dBu or 12 dBu Select gain relative to the system under test a Correct Phase b Phase Error of 180 c Phase Error of approximately 30 Figure 4 13 Audio displays 1740A 1750A Series Waveform Vector Monitor User Manual 4 15 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 re corded video LTC is typically recorded on an unused audio track The 1740A 1750A Series monitor provides a voltage versus time display of the Time Code waveform which can be used to check for the following problems m Nosignal m Sync word in the wrong position improper Time Code to Video sync Low amplitude or noisy time code signal To display the Time Code signal on the monitor connect the video signal containing LTC to the rear panel REMOTE connector as follows pin 12 input pin 13 input and pin 14 ground Push the front panel TIME CODE button The display should be a stable square wave Sync Word The trigger point is FIELD 1 of the applied video wave form either internal or external reference When synchro nized to video the display is stable The sync word should appear on the right If it is missing drifting or in another position there is a problem wi
82. isplay with phase error 1740A 1750A Series Waveform Vector Monitor User Manual 2 23 Operator s Checkout Procedure 20 es c uie s bu amp Tey Sing PE Nos 8 Pd re en oL VECTOR PHASE Figure 2 18 PAL SC H display This concludes the Operator s Checkout Procedure 2 24 1740A 1750A Series Waveform Vector Monitor User Manual 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 VECTOR WAVEFORM AUDIO W SCH 1750A Series only PICTURE TIME CODE m MULTIPLE displays Vector The vector mode presents an XY plot of demodulated chromi nance phase and amplitude The angle represents chromi nance phase and the distance from the center represents chrominance amplitude A bezel control is assigned to adjust VECTOR PHASE Waveform The waveform monitor portion of the instrument provides a voltage versus time display of the video signal The selected input can be displayed in one or two line or one or two field sweeps In LINE SELECT mode identified lines of any field can be selected and displayed Multiple inputs can be displayed at the same time or multiple filters can be applied to one input for signal analysis TIME
83. ithout instal ling the mounting screws There is nothing to hold the instrument in the cabinet if it is tipped forward The 1700F00 is a plain cabinet designed for permanent installations and the 1700F02 is a portable cabinet with handle feet flipstand and front cover Ordering information is given on page 1 8 Custom Installation For applications such as consoles the instrument can be mounted with front molding flush or protruding from the console In both cases allow approximately three inches of rear clearance for BNC and power cord connections To mount the instrument safely attach it to a shelf strong enough to hold its weight using the four 0 156 inch diameter holes in the bottom of the 1700F00 cabinet Refer to the data sheet included with the cabinet for hole locations 1 12 1740A 1750A Series Waveform Vector Monitor User Manual 1740A 1750A Series Waveform Vector Monitor User Manual 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 connec tions 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 If only one section of the rack adapter is u
84. itude of the video signal which is typically 1 volt The IRE point is at blanking level with sync tip at 40 IRE and white extending to 100 IRE IRE stands for Institute of Radio Engineers the organization which defined the unit Linear Distortion Refers to distortions which are inde pendent of signal amplitude 1740A 1750A Series Waveform Vector Monitor User Manual G 5 Glossary Luminance The signal which represents brightness or the amount of light in the picture This is the only signal re quired 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 Modulated PAL When referring to television test signals this term implies that chrominance information is present For example a modulated ramp has subcarrier on each step Modulation A process which allows signal information to be moved to other frequencies in order to facilitate transmis sion or frequency domain multiplexing See AM and FM for details Non Linear Distortion Refers to distortions which are amplitude dependent NTSC National Television System Committee The orga nization which developed the television standard currently in use in the United States Canada and Japan Now generally
85. lay For COMPONENT the internal reference is A1 when A123 is selected and B1 when B123 is selected sync is present only on the first channel VECTOR 3 18 BARS The instrument can be configured to accept 75 or 100 amplitude color bar signals Dual Standard instruments allow color bar signal ampli tudes to be set for NTSC and for PAL operation SETUP NTSC operation only Configures the instrument to accept signals with or without setup PAL PAL operation only When V is chosen the phase reference of the V lines is inverted then shown as an overlay on the V lines to provide a comparison display V shows V and V on alternate lines TEST Used by service personnel refer to the service manual 1740A 1750A Series Waveform Vector Monitor User Manual Using the Menus Bezel Buttons Figure 3 6 The CONFIGURE menu display with INPUT selected e e Left Center Right FORMAT CONFIG FORMAT is used to to select the configura tion of signals used for interconnection of equip ment Available signal formats are GBR SMPTE EBU BETA and MII When viewed as a waveform parade display GBR signals can be displayed in either GBR sequence or RGB sequence as selected through the GBR PARADE GBR RGB menu Table 3 1 shows valid format selections CONFIG FORMAT is also used to select LIGH
86. m Vector Monitor User Manual G 1 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 synchroniz ing 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 Bruch Blanking PAL A 4 field burst blanking se quence employed in PAL signals to ensure that burst phase is the same at the end of each vertical interval Burst NTSC A small reference packet of the subcarrier sine wave typically 8 or 9 cycles which is sent on every line of video Since the carrier is suppressed this phase and frequency reference is required for synchronous demodula tion of the color information in the receiver Burst PAL A small reference packet of the subcarrier sine wave sent during the horizontal blanking interval on every line of video Since the carrier is suppressed this phase and frequency reference is required for synchronous demodulation of the color difference signals in the receiver B Y NTSC One of the color difference signals used in the NTSC system obtained by subtracting luminance from the blue camera signal This is the signal which drives the horizontal axis of a vectorscope B Y PAL One of the color difference signals used in the P
87. n 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 User Manual and Service Manual Note Please complete and mail the Business Reply Card found in the user manual to receive a service manual when it becomes available W Power Cord m Replacement Fuse Cartridge 1 m Replacement Graticule Light Bulbs 4 Replacement Air Filters for Fan 4 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 Attach a tag to the instrument showing the owner complete address and phone number of someone at your firm who can be contacted the instrument serial number and a description of the required service 2 Package the instrument in the original packaging materi als If the original packaging materials are not available follow these directions 1740A 1750A Series Waveform Vector Monitor User Manual 1 9 Installation a Obtain 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 275 pounds b Surround the instrument with a protective bag anti static preferred For instruments which are not in a cabinet wrap a
88. nd press MAG The cursor is still at the same point on the signal use the HORIZ POS control if needed to view the cursor Select timing cursors TIME The timing cursors appear as two vertical dashed lines cursor 1 has single dashes and cursor 2 has double dashes The time difference between them is displayed as AT Select voltage and timing cursors together V T Note that when CONTROL is set to TIME the three bezel controls adjust timing cursors when set to VOLT they adjust voltage cursors Select markers MARK The markers appear as three dashed lines marker 1 has long single dashes marker 2 has double dashes and marker 3 has short dashes Use the three bezel controls to position the markers to a reference point on the etched graticule such as peak white baseline and sync tip Select X5 gain and notice that the markers do not move These markers can be used to highlight desired features of the waveform graticule Turn off the GAIN menu then press the CURSOR button Select VECTOR display mode The vector cursor menu is displayed POLAR has been selected by the factory preset The polar cursor appears as cross hairs Use the left bezel 1740A 1750A Series Waveform Vector Monitor User Manual 2 15 Operator s Checkout Procedure 2 16 control to move the cursor away from graticule center and the center bezel control to move the cursor around the grati cule center point Note that the amplitude and phase of the cursor ar
89. ocation When STORE pin 25 is grounded along with one of the pre set pins the current front panel setup is stored at the selected preset location 1740A 1750A Series Waveform Vector Monitor User Manual 3 25 Remote Operation 3 26 1740A 1750A Series Waveform Vector Monitor User Manual 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 wa veform and vector markings The internal graticule scales are on the same plane as the CRT phosphor eliminating par allax errors Graticule illumination can be adjusted through the CRT menu page 3 24 to provide optimum brightness for viewing or photographing displays Waveform Graticule There are three versions of the waveform graticule illus trated in Figure 4 1 Figure 4 2 and Figure 4 3 m NTSC composite video graticule 1740A and 1750A only m composite graticule 1741A and 1751A only m Dual standard graticule 1745A and 1755A only Horizontal Scale The 0 IRE 0 3V graticule line is divided into 12 major divi sions Each division represents a unit of time determined by the SWEEP and MAG settings Line sweep rates are as fol lows SWEEP TIME DIV MAG ON 1 LINE SWEEP 5uS DIV X 200nS Div 2 LINE SWEEP 10uS DiV 1 uS Div In 2 FIELD SWEEP with MAG ON the entire vertical interval can be viewed 17
90. of X1 X5 X10 and variable gain CRT menu allows adjustment of CRT focus signal intensity and trace rotation 1740A 1750A Series Waveform Vector Monitor User Manual 2 7 At A Glance CLEAR MENU turns off the selection portions of the menu readout When CLEAR MENU has been used to clear a menu readout push the menu button once to reinstate the readout and once again to exit the menu Rear Panel Connectors The following is an overview of rear panel connectors Figure 2 4 shows the 1750A rear panel Loop Through Inputs INPUTS A A1 A2 A3 B B1 B2 and B3 are passive loop through video inputs compensated for 75 The front panel INPUT switch settings determine which channel s are displayed The eight inputs can be configured for composite or component video signals EXT REF is 75 compensated loop through syn chronization input Internal or external reference is selected through the front panel REF EXT switch the LED lights to show when external is selected The instrument will operate from external references of composite video or black burst Outputs PIX OUT is a 75 compensated output of the video signal selected by the front panel INPUT switches This signal has bright up in LINE SELECT mode and is used to drive a picture monitor PIX OUT strobe is not present below line 11 1740A 1750A Series Waveform Vector Monitor User Manual At A Glance Multi Pin Connectors W REMOTE is a 25 pin submin
91. om the GAIN MENU for exactly 100 IRE 700 mV PAL of signal amplitude from baseline to the middle of the white bar 1740A 1750A Series Waveform Vector Monitor User Manual 4 5 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 2 K Factor For signals with a bar half amplitude duration that exceeds 18 us 8 us 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 us of the bar should be disregarded Pulse to bar K Factor measurements are made by normaliz ing bar amplitude 100 IRE or 1 V and adjusting the HORIZ POS control to position the pulse on the line time distortion structure Use the VAR GAIN see CONFIG GAIN menu page 3 24 to adjust signal amplitude Make sure that the center of the bar is at 100 IRE 1 Volt PAL when blanking level is at 0 IRE use VARIABLE GAIN to adjust gain if necessary Use the HORIZ POS control to place the 2T pulse over the center of the boxed measurement area and measure its amplitude When the top of the pulse falls within the dashed lines the K Factor equals 2 or less 1740A 1750A Series Waveform Vector Monitor User Manual Basic Measurements Vector Graticule The VECTOR display permits measurements of hue in terms of the r
92. on page 1 7 Fuse Replacement Remove the fuse cap from the rear panel and replace the fuse cartridge with a 250V 2A F type fuse as specified on the rear panel 1740A 1750A Series Waveform Vector Monitor User Manual C 1 Appendix C User Service Graticule Light Replacement C 2 Replacement Bulbs Replacement bulbs are supplied with this instru ment 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 recom mended For example Miltex PL312 6 100 equivalent to PL312 or PL317 longer than PL312 Needle nosed pliers are not recommended Procedure 1 2 Remove the five knobs below the CRT Insert a small straight blade screwdriver into the re cessed area on either the right or left side of the panel Pry gently until the panel snaps out of the front panel frame See Figure C 1 for panel and recess location 1740A 1750A Series Waveform Vector Monitor User Manual 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 de scribed in step 3 position it in front of the socke
93. or Monitor User Manual Appendix A Performance Specification Table A 4 Measurement Cursors CATEGORY DESCRIPTION Req Voltage 0 5 Timing 0 5 for line rate sweeps Waveform Accuracy RI Typically 0 5 for field rate sweeps Vector Accuracy 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 8 V division 10 RGB Sweep Length 1 Field 30 of normal 1 Line 30 of normal YRGB Sweep Length 1 Field 25 of normal 1 Line 25 of normal Ri Maximum staircase operating signal DC signal plus peak ac not to exceed 12 V to 12 V Line or field rate sweep Peak to peak ac signal not to exceed 12 V Sweep Repetition Rate Field or line rate of displayed video or external sync signal as selected by the front panel sweep selection 1740A 1750A Series Waveform Vector Monitor User Manual A 7 Appendix A Performance Specification Table A 6 Calibrator CATEGORY Waveform Square Wave Waveform Sine Wave Vector Circle Table A 7 Vector Mode CATEGORY Input Requirements Nominal Subcarrier Frequency Fsc Chrominance Processing Band width 3 dB PAL V Display Phase Accuracy Error Display Gain Accuracy Error Quadrature Phasing Error Subcarrier Regenerator Pull in Range A 8 DESCRIPTION Req Req Req Amplitude 1 0 V 0 5 Frequenc
94. ormance Specification Table A 1 Waveform Vertical Deflection Cont CATEGORY Transient Response Pix Out Gain Pix Out Frequency Response Pix Out Differential Gain Pix Out Differential Phase Pix Out Output Impedance Pix Out Return Loss Pix Out Line Select Strobe DC Restorer 60 Hz 50 Hz Attenuation DC Restorer Offset Error Fast Settling Time Blanking Shift with 10 to 90 APL Change A 4 DESCRIPTION Req Req Req Req Req Req Req Req Req Pulse to Bar Ratio 0 99 1 to 1 01 1 Preshoot x 1 RI Overshoot x 1 Ringing lt 1 Field Rate Tilt lt 1 Line Rate Tilt lt 1 RI Differential Gain x 196 1 3 3 to 6 MHz RI lt 1 xl 750 gt 30 dB to 6 MHz dc offset is added to output in line se lect to bright up the selected line or lines Slow Mode x 1096 Fast Mode 95 Back porch or sync tip clamp point is selected through menu lt 1 IRE 7 mV PAL Typically 3 mV Ri x6 video lines lt 1 IRE 7 mV PAL 1740A 1750A Series Waveform Vector Monitor User Manual Appendix A Performance Specification Table A 1 Waveform Vertical Deflection Cont CATEGORY DESCRIPTION Blanking Shift with Presence and Absence of Burst Req x1IRE 7 mV PAL RI Typically 3 mV Table 2 External Reference CATEGORY DESCRIPTION Input RI Composite video or black burst Maximum Operating Input 1 8 V to 2 2
95. rvice center is located Customer shall be responsible for paying all shipping charges duties taxes and any other charges for products returned to any other locations This warranty shall not apply to any defect failure or damage caused by improper use or improper or inadequate maintenance and care Tektronix shall not be obligated to furnish service under this warranty a to repair damage resulting from attempts by personnel other than Tektronix representatives to install repair or service the product b to repair damage resulting from improper use or connection to incompatible equipment c to repair any damage or malfunction caused by the use of non Tektronix supplies or d to service a product that has been modified or integrated with other products when the effect of such modification or integration increases the time or difficulty of servicing the product THIS WARRANTY IS GIVEN BY TEKTRONIX IN LIEU OF ANY OTHER WARRANTIES EXPRESS OR IMPLIED TEKTRONIX AND ITS VENDORS DISCLAIM ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE TEKTRONIX RESPONSIBILITY TO REPAIR OR REPLACE DEFECTIVE PRODUCTS IS THE SOLE AND EXCLUSIVE REMEDY PROVIDED TO THE CUSTOMER FOR BREACH OF THIS WARRANTY TEKTRONIX AND ITS VENDORS WILL NOT BE LIABLE FOR ANY INDIRECT SPECIAL INCIDENTAL OR CONSEQUENTIAL DAMAGES IRRESPECTIVE OF WHETHER TEKTRONIX OR THE VENDOR HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES General Safety Summar
96. s cancelled when another input button is pressed With PARADE or OVERLAY selected the input channels can be displayed in combination Pushing an input channel button sequences through the labeled channels both then off Push ing another input button does not cancel the current selec tion but adds to it To return to single input operation push the PARADE OVERLAY button until it is off LED is no longer lighted 1740A 1750A Series Waveform Vector Monitor User Manual 3 3 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 In PARADE mode the LINE FIELD button offers only two choices one line and one field Up to four channels can be displayed side by side additional channels are overlaid Overlay OVERLAY superimposes the selected input signals The LINE FIELD button remains a four way toggle providing one line two line one field and two field displays Sweep Sweep buttons are used to select the waveform sweep rate LINE FIELD toggles through four sweep rate selections one line two line one field and two field In PARA
97. scillator locked to the carrier 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 result Video is a 75 Q system so a 75 Q terminator must be put at the end of the signal path Time Code Longitudinal LTC LTC is an 80 bit signal with information which makes it possible to accurately identify an individual frame The LTC signal is typically recorded on an audio channel Time Code Vertical VITC VITC is a signal in the vertical interval of video which makes it possible to accu rately identify an individual field U The B Y signal after a weighting factor of 0 493 has been applied The weighting is necessary to reduce peak modula tion in the composite signal Unmodulated When used to describe television test signals this term refers to pulses and pedestals which do not have high frequency chrominance information added to them V The R Y signal after a weighting factor of 0 877 has been applied The weighting is necessary to reduce peak modula tion in the composite signal Vectorscope A specialized oscilloscope which demodu lates the video signal and presents a display of R Y versus B Y in NTSC systems or V versus U in PAL systems The angle and magnitude of the displayed vectors are respectively related to hue and saturation 1740A 1750A Ser
98. sed a 1700F06 blank panel or 1700F07 utility drawer can be inserted in the unused section Order ing information is given on page 1 8 Installation 1 14 1740A 1750A Series Waveform Vector Monitor User Manual 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 1740A 1750A Series Waveform Vector Monitor User Manual 1 15 Instrument Configuration 1 16 1740A 1750A Series Waveform Vector Monitor User Manual Getting Started 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 Allfront panel controls are the continuous action type and all front panel buttons are push and re lease toggle switches Wm Green LEDs light to indicate the current switch selection POWER ON STANDBY turns the instrument on or to standby status An LED indicates when power is on If an appropriate power source is supplied to this instrument line voltage will be present even when in STANDBY mode Do not operate the instrument without a cabinet or rack adapter such as those described on page 1 8 serious injury could result Instrument Reset
99. set values such as phase ampli tude and intensity The left control is also used to select categories within the CONFIG menu Figure 3 1 shows the bezel controls and buttons Moving Between Menus Selecting a second menu removes the present menu display but the functions typically remain active with the menu LED remaining lighted to show this state To reinstate a menu display push that menu button again 1740A 1750A Series Waveform Vector Monitor User Manual 3 5 Using the Menus Figure 3 1 CRT PRESET and CONFIG menus will be exited completely when another menu button is pushed E Bezel Buttons 00000 Left Center Right Bezel Controls 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 The menu LED remains lighted to show this state Push the menu button to bring back the full display CRT PRESET and CONFIG menus will be exited completely when CLEAR MENU is pushed Exiting a Menu Function To exit a menu function while its display is present push that menu button The menu button is functioning as an on off toggle switch If the menu display is not present but the 1740A 1750A Series Waveform Vector Monitor User Manual
100. t Figure 4 12 1740A 1750A Series Waveform Vector Monitor User Manual Basic Measurements Tek 5 gt es lt 100 HH eYE 7V ET Ui 9 D 4 P Burst pe 2 9 Sea Jra Z Horizontal Sync nTscEH rege N p Lem ne eu e uc a vin wan n En En ER 7 pes DIFF 6 SS lt amp rey Sing XL Ne HL e 1 VECTOR PHASE Figure 4 10 Two Field SC H R Y display NTSC showing proper SC H phase 1740A 1750A Series Waveform Vector Monitor User Manual 4 13 Basic Measurements 40 EE T NTSCEH Figure 4 11 Two Field SC H R Y display NTSC showing approximate 10 phase error 4 14 1740A 1750A Series Waveform Vector Monitor User Manual 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
101. t 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 Replace the five knobs below the CRT and tighten the set screws Recess Remove this N N N N N shaded portion Remove these five knobs Figure C 1 Graticule light replacement 1740A 1750A Series Waveform Vector Monitor User Manual C 3 Appendix C User Service Cleaning C 4 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 Do not allow water to get inside any enclosed assembly or component Do not clean any plastic materials with benzene toluene xylene acetone or similar compounds because they may damage the plastic Exterior Clean the dust from the outside of the instrument with a soft clean cloth or small brush A brush is especially useful for removing dust from around the selector buttons knobs and connectors Hardened dirt can be removed using a soft cloth dampened with a mild detergent and water solution Abra sive cleaners should not be used CRT 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
102. th the Time Code to Video synchronization Amplitude Time code gain is set from the GAIN MENU when 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 If the waveform monitor display amplitude is much less than would be expected for the given input a problem may exist with the Time Code level 1740A 1750A Series Waveform Vector Monitor User Manual Calibration Instrument gain may require readjustment for special moni toring 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 CALI BRATE menu CONFIG menu is described on page 3 18 Set Vertical Gain 1 adjust vertical gain select WAVEFORM display mode and push the CONFIG menu button Select CALIBRATE then CAL SIG ON and GAIN CAL ON a Turn the VERT CAL control until the calibra tor signal or applied reference signal amplitude is 140 0 IRE 1000 mV for PAL as read on the graticule b Pushing RESET VCAL will cancel any gain adjustment and reinstate the factory gain setting 1740A 1750A Series Waveform Vector Monitor User Manual 4 17 Calibration Set Horizontal Gain 1 To set horizontal g
103. the above listed standards This product complies when installed into any of the following Tektronix instrument enclosures 1700F00 Standard Cabinet 1700FC2 Portable Cabinet 1700F05 Rack Adaptor AS NZS 3548 Information Technology Equipnrent 1995 FCC Conpliance Emissions comply with FCC Code of Federal Regulations 47 Part 15 Subpart B Class Limits 1740A 1750A Series Waveform Vector Monitor User Manual A 13 Appendix A Performance Specification Table A 15 Certifications and compliances cont CATEGORY Installation Overvoltage Category Pollution Degree A 14 STANDARDS OR DESCRIPTION Terrrinals on this product may have different installation overvoltage category designations The installation categories ae CAT 111 Distribution level mains usually permanently connected Equipment at this level is typically in a fixed industrial location CAT Il Local level mains wall sockets Equipment at this level includes appliances portable tools and similar products Equipment is usually cord connected CATI Secondary signal level or battery operated circuits of electronic equipment A measure of the contaminates that could occur in the environment around and within a product Typically the intemal environment inside a product is considered to be the sarre as the extemal Products should be used only in the environment for which they are rated Pollution Degree 1 No pollution or only dry non
104. wo 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 Us ing the amplitude control to move the cursor out from the center increases the amplitude Adjusting the cursor phase will rotate the cursor around the center point with the zero phase point being the B Y U axis The amplitude readout can be set for mv or IRE values through the CONFIG menu described on page 3 18 When the gain or position of the signal is changed the polar cursors maintain their relationship with the signal When CLEAR MENU is pressed the POLAR MARK choice on the right side of the screen will be removed but the bezel controls will still be active and cursor measurements can still be made When another menu is selected the bezel controls may be reassigned to the new menu but will return to cursor control when the new menu is deselected Markers can be used to highlight graticule points When MARK is selected two additional menu readouts appear These allow selection of from one to eight markers and as sign the AMPLITUDE and PHASE bezel controls to one o
105. x out signal for picture monitor 2 8 Polar cursors 3 8 Position controls 2 5 Power cord 1 5 Power Source Specification A 12 Power source 1 10 Preset menu 3 16 R R Y filter 3 7 Rack adapter installation 1 13 optional accessory 1 8 Readout intensity 1 15 3 24 Rear panel connectors 2 8 Recall preset 3 17 Reference internal external 3 23 Reliability A 1 Remote connector configuration 3 23 description 2 9 B 1 pin assignments B 1 wiring converter B 4 Remote sync B 2 Rename presets 3 17 Reset locked instrument controls 2 1 Reset gain 3 22 RGB YRGB Specification A 7 RGB YRGB staircase input 3 23 1740A 1750A Series Waveform Vector Monitor User Manual I 3 Index RS232 connector 2 9 B 5 S Scale illumination 3 24 SCH display 2 5 3 2 SCH phase measurements 4 10 SCH Phase Mode Specification A 11 SCH R Y 3 7 Serial interface B 5 Servicing 1 9 Set instrument gain 3 22 Setup graticule 4 2 Signal intensity 1 15 3 24 Software version 3 23 Specification Audio Mode A 10 Calibrator A 8 Certifications and compliances A 13 CRT Display A 11 Electrical A 2 Environmental Characteristics A 12 External Reference A 5 Measurement Cursors A 7 Physical Characteristics A 13 Power Source A 12 RGB YRGB A 7 SCH Phase Mode A 11 Time Code A 10 Vector Mode A 8 Waveform Horizontal Deflection A 6 Waveform Vertical Deflection A 2 Staircase 3 23 B 1 Standard
106. xam ple select FIELD 1 and 15H and rotate the LINE SEL control to line 34 This provides a readout of field 1 lines 34 through 48 34 F1 48 Line Select Functions All of the other menus are functional during line select op eration The line select menu display disappears when anoth er menu is selected but the selected line and field are displayed until the line select menu is exited The field and line readout remains in the upper left of the screen and the line select LED remains lighted to indicate this state Line select can also be used with MULTIPLE displays of WAVE FORM VECTOR and SCH Selected displays appear on the screen in the following order WAVEFORM VECTOR SCH The readout indicates the line number of the highest priority display For example with waveform and vector displays both selected a readout of F1 20 would indicate that field 1 line 20 is displayed in waveform mode and field 1 line 21 is displayed in vector mode In a waveform display the selected line is displayed first in a two line sweep and brightened in a field sweep When line select is enabled the rear panel PIX MON output highlights the selected line on the picture monitor display 1740A 1750A Series Waveform Vector Monitor User Manual 3 15 Using the Menus Preset Menu The 1740A 1750A Series has 10 presets capable of storing front panel setups Nine of the presets are user program mable and one is factory pre programme
107. y 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 Connect and Disconnect Properly Do not connect or disconnect probes or test leads while they are connected to a voltage source Ground the Product This product is grounded through the grounding conductor of the power cord To avoid electric shock the grounding conductor must be connected to earth ground Before making connections to the input or output terminals of the product ensure that the product is properly grounded Observe All Terminal Ratings To avoid fire or shock hazard observe all ratings and mark ings on the product Consult the product manual for further ratings information before making connections to the prod uct 1740A 1750A Series Waveform Vector Monitor User Manual i 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 speci fied for this product Avoid Exposed Circuitry Do not touch exposed
108. y 100 kHz 0 1 Ri Crystal controlled 10 us square wave Amplitude 1 0 Vp p 1 RI Circle that approximates the graticule compass rose DESCRIPTION Req Req Req Req Req Req 1V p p 6 RI Instrument freeruns with no input External Reference Black burst or com posite video NTSC 3 579545 MHz PAL 4 43361875 MHz 1 MHz 200 kHz Ri Axis is inverted at 1 2 video line rate lt 1 25 lt 2 5 with 75 amplitude color bars lt 0 5 Bursts set to targets NTSC PAL 50 Hz 10 Hz 1740A 1750A Series Waveform Vector Monitor User Manual Table A 7 Vector Mode Cont CATEGORY Subcarrier Regenerator Pull in Time Phase Shift with Fsc Change Phase Shift with Burst Amplitude Change of 6 dB Phase Shift With Video Input Channel Change Phase Shift With Variable Gain Control 3 dB to 6 dB Burst Jitter Clamp Stability Phase Control Range Phase Control Quantization Position Control Range Differential Phase Differential Gain Appendix A Performance Specification DESCRIPTION Req Req Req Req Req Req Req Req x2 seconds NTSC x2 Fsc to Fsc 50 Hz PAL x2 Fsc to 10 Hz x2 lt RI With external reference selected Typically lt 0 5 lt 0 5 Ri x0 5 rms lt 1 64 inch 0 4 mm Center spot movement with rotation of the phase control RI 360 continuous
109. y Variations Input Timing RI Stable display with Video to External Reference timing Color Frame Range RI 70 Color frame correctly identified when applied external refer ence signal is x 70 of 0 SCH Table A 11 CRT Display PAL Values in Parentheses CATEGORY DESCRIPTION CRT Viewing Area 80X 100 mm Horizontal 12 5 divisions Vertical 170 IRE 1 19 V Accelerating Potential Nominally 13 75 kV Trace Rotation Range Req lt and 1 from horizontal Total adjustment range is typically 8 Graticule Ri Internal with variable illumination 1740A 1750A Series Waveform Vector Monitor User Manual A 11 Appendix A Performance Specification Table A 12 Power Source CATEGORY Mains Voltage Range Mains Frequency Power Consumption DESCRIPTION Req 90 250 V RI Continuous range from 90 to 250 Vac RI 50 or 60 Hz 110 VA 67 watts maximum 102 VA 60 watts typical Table A 13 Environmental Characteristics CATEGORY Operating Temperature Storage Temperature Operating Altitude Storage Altitude Vibration Mechanical Shock Transportation Humidity A 12 DESCRIPTION Reg 0 t0 50 C 32 to 122 F Reg 40 to 75 C 40 to 158 F Req To 15 000 feet 4572 meters Req To 50 000 feet 15 240 meters Req 5 minutes at 5 15 Hz with 0 060 inch dis placement 5 minutes at 15 25 Hz with 0 040 inch dis placement 5 minutes at

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