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Tektronix Camcorder 1780-R User's Manual

Contents

1. 3 20 Table 3 5 Initial Settings eeeeeeees 3 37 Table 3 6 Configure Menu Selections page 1 3 53 Table 3 7 Configure Menu Selections page2 3 54 Table 3 8 Configure Menu Selections page 3 3 55 Table 3 9 Measure Menu Description 3 57 Table 4 1 DIFF PHASE Front Panel Configuration 4 4 Table 4 2 DIFF GAIN Front Panel Configuration 4 9 Table 4 3 DP amp DG Front Panel Configuration 4 14 Table 4 4 ICPM Front Panel Configuration 4 17 Table 4 5 K Factor Front Panel Configuration 4 22 Table 4 6 Chroma Luma Front Panel Configuration 4 25 Table 4 7 Short Time Distortion Mode Front Panel Configuration 222222 2 2 2 P ka PEE arb un 4 30 Table 4 8 R Y Sweep Mode Front Panel Configuration 4 31 Table 4 9 Bowtie Mode Front Panel Configuration 4 35 Table 4 10 Fsc Time Marks Front Panel Configuration 4 36 Table 5 1 Input Output eere 5 1 1780R Series Operator s Manual Table of Contents Table 5 2 Waveform Monitor Vertical System 5 2 Table 5 3 Waveform Monitor Probe Input 5 7 Table 5 4 Waveform Monitor Horizontal Deflection Syste uu nere dene le d eene Y o e Nee NoD VN 5 7 Table 5 5 Waveform Monitor DG and DP Display 5 11 Table 5 6 Synchronization leere 5 13 Table 5 7 Vectorscope Vector Display 5 15
2. 1780R Series Operator s Manual 3 23 Operating Instructions 15 0 LsiDIV ASSIGN KNOB i OFFSET OFFSET MENU Figure 3 12 Offsets Menu Screen To obtain Offset menu touch OFFSET MENU until ON is outlined Touch lt OFFSET gt until VAR is outlined and touch CHB2 or CHB3 to assign large knob function to desired offset Large knob assignment will be circled Using the large knob adjust offset of the selected display with respect to the other display or displays DC Level Measurements The 1780R Series has the capability of indicating the DC levels of the B1 B2 and B3 channels with a high degree of accuracy This is useful when adjusting the DC levels of RGB signals coming from a CCU for example The following procedure details the DC measurement technique for Parade mode 1780R Series Operator s Manual Operating Instructions DC Level Measurement Procedure 1 1780R Series Operator s Manual Enter the Parade mode Press the CONFIGURE button and then use the vectorscope touch screen to select lt GND gt under the COUPLING area Press the CH B1 CH B2 CH B3 switch to go to Three Line Ensure that the button under the WFM CRT is selected Adjust the VERT POS control to set the CH B1 far left trace to a convenient reference line on the graticule Setting the WAVE FORM GAIN to X5 provides increased resolution Touch OFFSET until ON is outlined Touch OFFSET
3. Large Knob And Associated Switches Timing Cursors Push the TIME switch to enable the timing cursors and obtain a menu on the vectorscope CRT Use this menu to choose cursors that track together or are positioned separately and to choose between locate and measure When SEPARATE is selected by touching the lt SEPARATE TRACK area of the screen the large knob moves Cursor One or Cursor Two depending on which cursor is selected outlined When TRACK is selected the large knob moves both cursors at the same time The two cursors appear as bright up portions of the waveform display when LOCATE is selected or as bright up dots when MEASURE is selected The readout indicates the time difference between Cursor One and Cursor Two in five nanosecond intervals If magnification or variable sweep is selected the cursor interval is magnified correspondingly Time difference between Cursor One and Cursor Two can be determined even though they may not both be on screen at the same time To change the large knob assignment from one cursor to another touch the quadrant labeled lt CURSOR 1 CURSOR 2 gt The current assignment is outlined by a box Cursors appear to wrap around in One Line and Two Line sweeps because the total cursor range 160 us extends beyond the One or Two Line sweep length A beep sounds at both ends of the range Time difference between Cursor One and Cursor Two can be determined even tho
4. 3 42 1780R Series Operator s Manual Operating Instructions Waveform Calibration Procedure 1 Apply a video signal to a 1780R Series input channel and select that channel for display 2 Push the front panel CONFIGURE button and touch lt FIXED CAL AMPL gt until 1000 1 0 volt is outlined 3 Push the front panel CALIBRATE button If Password operation is enabled enter the password now The Waveform Calibration menu will be displayed as shown in Figure 3 20 4 lt READOUT INTENSITY gt will be circled and a test readout will be displayed Use the large knob to adjust the readout to the desired intensity It is necessary to adjust readout intensity in this manner the front panel INTENSITY control is used to adjust signal intensity only Perform Step 5 for SN below B020245 only 5 Touch HORIZ POS KNOB CAL to calibrate the Horizontal Position knob A menu will be displayed on the waveform CRT Center the Horizontal Position control by turning the knob and releasing allowing the spring not necessarily the signal display to return to midpoint of its range Then touch the area labeled CENTER HORIZONTAL POSITION KNOB THEN PRESS HERE This tells the microprocessor that the knob is now at the midpoint or zero point of its range This zero point is referred to as the Dead Zone and its tolerance can be varied by touching INCREASE or DECREASE The value changes in single step increments from the smallest pos
5. 4 17 ICPM Measurement Procedure 00055 4 18 1780R Series Operator s Manual Table of Contents K Factor Measurement 0 00 eee e eee Enter K Factor Mode 000 e cece eee Making K Factor Measurements 00 Chroma Luma Inequalities Measurement Enter Chroma Luma Mode ssss Exit Chroma Luma Mode 0 000000 eee Cursors in Chroma Luma 0000 e eee Making Chroma Luma Measurements Using Cursors Chroma Luma Measurements with Lissajous Display Short Time Distortion Measurement 04 Enter Short Time Distortion Mode Exit Short Time Distortion Measurement Mode Short Time Distortion Measurement Procedure R Y Sweep Measurement 00 0 0 0 0000 Enter R Y Sweep Mode 0000 0 Exit R Y Sweep Measurement Mode R Y Sweep Mode Information Using R Y Sweep Mode 00000 Bowtie Measurement 0 00 cee Enter Bowtie Measurement Mode Bowtie Measurement Procedure 0005 Fsc Time Marks Measurement 0 0000 c eee aee Enter Fgc Time Marks Measurement Mode Exit Fgc Time Marks Measurement Mode Making SCH Phase Measurements Voltage Cursors in Fsc Time Marks Mode
6. Verifying Burst Position 0 0 eee eee Other Measurements 0 00 c cece eee een eee Specifications Options and Accessories OPUONS sd as EUR eek Re Mabe t eae waa pes Welt IACCESSOTIES estate talk Rt eI ES PRESA DES E Standard Accessories 0 0 cece eee eee eens Optional Accessories 0 0 00 cece eee eee Index 1780R Series Operator s Manual Table of Contents List of Figures Figure 1 1 Location of the four screws that secure the instrument to rack mounting cabinet or portable case 1 5 Figure 1 2 Dimensions used for rack mounting the 1780R Series Video Measurement Set 1 6 Figure 1 3 Dimensions of the adjustable rear rack mounting bracket eeeeeeees 1 7 Figure 1 4 Installing rear rack mounting brackets for rack applications of depths from 18 to 24 inches 1 8 Figure 2 1 Left side of front panel 2 4 Figure 2 2 Right side of front panel 2 10 Figure 2 3 Rear Panel Connectors esee 2 17 Figure 3 1 Line Select Menu Screen with lt 2 OF 4 gt Fields selected i ese io RR Rh EXER EX RO EE 8 3 4 Figure 3 2 Line Select Menu Screen with 1 OF 8 gt Fields selected 5 3o 5 iewP UNE er VEU EV ae Murer EUR OE E 3 5 Figure 3 3 1780R Vector Graticule 3 7 Figure 3 4 1781R Vector Graticule 3 8 Figure 3 5 Rear panel X Y Connector Pin
7. until VAR is outlined and touch CH B2 to assign large knob function to that channel Use the large knob to align CH B2 with CH Bl Touch CH B3 and use the large knob to align CH B3 with CH BI Turn off the OFFSET MENU and change the lt COUPLING gt from GND to DC Press the CONFIGURE button to return to the normal operating mode The DC levels of all three signals can now be read directly from the graticule For NTSC graticules one IRE 7 142857 mV Operating Instructions Overlay Operation NOTE Switch function is further described in Section 2 Select the Overlay mode of operation by pushing the PARADE OVERLAY button shown in Figure 3 11 until the Overlay LED lights Two pushes may be required depending on the previous condition The instrument is forced to One Line operation Two and Three Line modes are locked out a beep sounds if the switch is pushed The LINE FIELD switch is still operational Overlaid Displays The CH A PROBE switch will select from the following input channel combinations for overlaid display CH A and CH B1 CH A and PROBE CH B1 and PROBE Subtract modes A B1 B1 B2 B1 B3 switch are unavailable in Overlay mode The CH B1 CH B2 CH B3 switch provides an overlaid display of any two or all three of these inputs Offset Menu When only B input channels are displayed an offset readout appears in the upper right corner of the waveform CRT
8. Accelerating Potential Norrinally 20 kV Orthogonality T1 Trace Rotation Range 2 1 fromhorizortal Typical adjustrrent range is zg Vectorscope Viewing Area 80X 100 nm Accelerating Potential Noninally 13 75 kV Orthogonality X1 1780R Series Operator s Manual 5 19 Specifications Table 5 11 Power Requirements Performance Supplemental Characteristics Requirements Information Mains Voltage Ranges 110 VAC 90 132V Selected by rear panel switch 220 VAC 200 250 V Mains Frequency Range 48 66Hz Crest Factor Power Consun pation 120 Watts rrexirrum Table 5 12 Physical Characteristics Characteristics Supplemental Information Dirrensions Height 5 1 4 inches 133 4 rrr Width 19 inches 483 nn Length 18 inches 460 nn Net Weight Approximately 28 Ibs approximately 12 7 kg Shipping Weight Approximately 45 Ibs approximately 20 1 kg 5 20 1780R Series Operator s Manual Specifications Table 5 13 Environmental Summary Characteristics Supplemental Information Terrperature Operating O C to 450 C Non Operating 55 Cto 475 C Altitude Operating To 2 kmmaxinum Vibration Operating 0 015 inch 0 38 nm peak to peak 10 55 Hz 75 minutes total Shock Non Operating 30 g acceleration 3 tines each rrajor axis 11 ms halfsine Bench Handling 4 inch drop to table top on each of the four bottomcomers Terman o e a O O Procedure 1A B 1 Drop Test Qualified u
9. BARS PHASE DISPLAY VECT GRAT WEM GRAT ABS UNITS PROBE X10 Xl SETUP Vectorscope can be calibrated to 75 or 100 color bars 360 Phase reads fromO to 360 180 Phase reads from H80 to 179 95 Select intemal or extemal graticule illurrination Select intemal or extemal graticule illurrination NTSC only Choose millivolts or IRE units to express calibrator and voltage cursor amplitudes Intemal probe gain is X1 or X10 With 10X probe 1 V signal at probe tip 1 V on screen Works like probe input on 1480 With X1 probe 1 V signal at probe tip 1 V on screen With X10 probe 5 V signal at probe tip 0 5 V on screen For use with TTL etc NTSC only Select 2Y ES when there is 7 5 setup on the incorring signal 1780R Series Operator s Manual Operating Instructions PRESET MEASURE CONFIGURE CALIBRATE Left CRT display sac o i VECTREADOUT EXT OFF PEE EIEEE EEE TAANE TATT Pee eene enn nnn nn SLOW SWP WEM READOUT BAUD RATE KNOB ASSIGN TIMEOUT jo VERSION oF o tf Figure 3 26 Configure Menu Screen page 3 Table 3 8 Configure Menu Selections page 3 CW SYNC SLOW SWP TRIG BAUD RATE VECT READOUT WFM READOUT BEEP KNOB ASSIGN TIMEOUT VERSION When CW subcarrier is used for vectorscope reference wimsync source can be INT or EXT Select positive or negative transition of the input signal to trigger slo
10. 240 cB to 10 MHz Chroma Typically within 30 nv 1V p to p corrrron node signal Filters Lurrinance lt 3 dB down at 1 MHz 240 dB down at 3 58 or 4 43 MHz Low Pass 214 dB down at 500 kHz Typically 3 dB at 300 kHz Chrorrinance 3 58 MHz 1 of flat at 3 58 MHz 3 dB points Lower 2 83 t0 15 MHz Upper 4 33 0 15 MHz 4 43 MHz 1 of flat at 4 43 MHz 3 dB points Lower 3 68 0 15 MHz Upper 5 18 t0 15 MHz 1780R Series Operator s Manual 5 5 Specifications Table 5 2 Waveform Monitor Vertical System Cont Characteristics Diff Steps Differentiated Steps Attenuation Linear VVaveform Distortion Pulse Preshoot Overshoot amp Ringing Pulse and Bar 25 Us Bar Tilt Field Square Wave Tilt ZT Sin Pulse to Bar Ratio Performance Requirements 240 dB at 3 58 MHz 4 43 MHz PAL lt 1 of applied pulse amplitude lt 1 of applied pulse amplitude lt 1 of applied bar arrplitude lt 1 of applied square wave amplitude 1L1 1 Non Linear V aveform Distortion Supplemental Information 5 step 20 IRE staircase within 2 of flat display Vertical Gain increase approximately 5X to compare staircase risers Typically lt 0 5 0n T Pulse lt LO onT 2 Pulse Typically lt O0 5 0n T Pulse lt LO onT 2 Pulse Typically lt 0 5 Differential Gain Aux Video Out 0 25 at 10 9096 APL Waveform Modes Pix Mon Out 0 25 at 10
11. 9096 APL Differential Phase Aux Video Out lt 0 25 at 10 90 APL Pix Mon Out lt 0 25 at 10 90 APL 1780R Series Operator s Manual Specifications Table 5 3 Waveform Monitor Probe Input Supplemental Characteristics Information Input Resistance iMO Input RC Product 20 Us 20 pF Gain With gain adjusted for equivalent 1 V p to p dis play Frequency Response swosme wm remonter Im Tilt Less than 5 on 50 Hz square Fast DC restorer elirrinates Probe Calibrator Period Output Voltage Irrpedance Out LO V 0 5 0 995 V to 1 005 V low frequency tilt on a composite video signal Supplemental Characteristics Information Sweep Rates amp Tirring Accuracy over center 10 divi Accuracy sions 1 Line 5 Us Div 2 2 Line 10 Us Div 2 3 Line 15 Us Div t2 1780R Series Operator s Manual 5 7 Specifications Table 5 4 Waveform Monitor Horizontal Deflection System Cont Performance Supplemental Characteristics Requirements Information 1 Field Sweep Displays 1 full field indud ing vertical intervel 2 Field Sweep Displays 2 full fields and the vertical interval between them First sweep left side of CRT is selectable be tween odd or even fields 3 Field Sweep Displays 3 full fields and the 2 vertical intervals between them First sweep is select able between even or odd fields and th
12. Front panel and menu settings are automatically adjusted to accommodate the selected measurement To exit a measurement mode push the front panel MEASURE button In the case of DIFF PHASE and DIFF GAIN measurements touch GO TO DIFF GAIN and GO TO DIFF PHASE areas of the screen to alternate between those two measurements Table 3 9 Measure Menu Description DIFF PHASE DIFF GAIN DP amp DG NOISE ICPM K FACTOR CHROMA LUMA SHORT TIME DISTORTION R Y SWEEP BOWTIE FSC TIME MARKS Beep Differential Phase Differential Gain Simultaneous Differential Phase Differential Gain Signal to Noise ratio Incidental Carrier Phase Modulation Ka measurerrent Chrorrinance to Lurrinance Gain amp Delay Short Tirre Distortion Demodulator output Instrurrert set to B1 B2 and B1 B3 in Parade node NTSC only Bright up dots on waveformat subcarrier frequency Although most front panel buttons remain operational in Measure ment modes some are locked If an attempt is made to change a locked setting a beep sounds Store and Recall Modified Setups Enter the Measure menu select a measurement and modify the front panel setup as desired Push the PRESET button Following Preset menu instructions store the modified measurement information at any preset location 1780R Series Operator s Manual Operating Instructions After both Preset and Measure menus have been exited push the PRESET button and touch the
13. Set the time separation to the bar time usually 10 ms or 25 ms minus 2 ms Put the time cursors in the TRACK mode and move the two cursors together until they are centered on the bar 1780R Series Operator s Manual Operating Instructions Remote Operation REMOTE Connector The rear panel REMOTE connector is a subminiature 15 pin D type receptacle with female contacts All the active Remote control lines are enabled by remote ground closures or TTL levels 0 V to 0 8 V Pin assignments for the REMOTE connector are shown in Figure 3 8 and Table 3 2 The REMOTE connector appears in the 1780R Series Service Manual Section 11 UART and A D Schematic Diagram RGB STAIRCASE INPUT GROUND RGB STAIRCASE ENABLE REMOTE SYNC INPUT NC STORE REMOTE SYNC ENABLE PRESET8 PRESET 2 PRESET5 PRESET3 PRESET 6 PRESET 1 PRESET 7 PRESET4 NC No Connection Figure 3 8 REMOTE Connector Pin Assignments Remote Operation 1 Connect the mating male plug supplied with the instrument to a remote box cable 2 Remote lines named Presets 1 through 8 correspond to the front panel Preset menu Presets through 8 These remote lines allow configurations already stored at Presets 1 through 8 to be recalled and new configurations to be stored at those preset locations 1780R Series Operator s Manual 3415 Operating Instructions a To recall a preset force the corresponding remote line low b To stor
14. Table 5 8 Vectorscope XY Display 5 18 Table 5 9 Vectorscope SCH Phase Display 5 18 Table 5 10 CRTs and High Voltage Supplies 5 19 Table 5 11 Power Requirements 5 20 Table 5 12 Physical Characteristics 5 20 Table 5 13 Certifications eee 5 21 Table 5 14 Environmental Summary 5 21 1780R Series Operator s Manual ix Table of Contents x 1780R Series Operator s Manual EE aa General Safety Summary Review the following safety precautions to avoid injury and prevent damage to this product or any products connected to it To avoid potential hazards use this product only as specified Only qualified personnel should perform service procedures To Avoid Fire or Personal Injury Use Proper Power Cord Use only the power cord specified for this product and certified for the country of use Use Proper Voltage Setting Before applying power ensure that the line selector is in the proper position for the power source being used 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
15. With a Field rate sweep selected the location and relative magnitude of the field rate SCH Phase errors are viewed If no SCH Phase errors are present the display will be flat for NTSC For PAL the display consists of a perfect 25 Hz sine wave with SCH Phase errors seen as deviations from the sine wave 4 32 1780R Series Operator s Manual Measurements Bowtie Measurement Use the following information to perform bowtie measurements Enter Bowtie Measurement Mode Push the MEASURE button to enable the Measurement menu shown in Figure 4 1 Touch lt BOWTIE gt on the screen BOWTIE is displayed on the left CRT The CH B1 B2 and CH B1 B3 signals are displayed on the right CRT The instrument is now configured as specified in Table 4 9 and Figure 4 10 The large knob has no function in Bowtie mode Bowtie Measurement Procedure 1 To check for timing and relative amplitude errors in a three wire signal path route a Bowtie test signal from a generator through the signal path to the 1780R Series CH B1 CH B2 and CH B3 Inputs 2 Push the MEASURE button then touch lt BOWTIE gt on screen 3 Check for a sharp null in the center of each half of the two line signal display The timing marker details in the waveform are an electronic graticule for calibration of the timing offsets The center taller pulse is the 0 time error mark Each mark away from center indicates 20 ns of relative timing error The left half co
16. mV for the CCIR graticule and IRE units and percent modulation for NTSC A mV scale has been added to the NTSC graticule to facilitate component measurements The graticules are also marked for K factor tolerances and linear distortion measurements Line time distortion NTSC Line time distortion is measured using the graticule box labeled L D 2 5 Any test signal that contains an 18 us 100 IRE bar can be used To make a measurement select a one line sweep and use the two arrows on the 50 IRE line to position the bar horizontally Make sure that the blanking level of the waveform is on the baseline and that the bar top passes through 100 IRE at its midpoint It may be necessary to use the variable gain control to normalize the gain The box excludes the first and last us 1780R Series Operator s Manual 3 13 Operating Instructions 3 14 of the bar Use the 2 and 5 graticule marks to quantify the peak to peak deviation of the bar top tilt or rounding within the structure The vertical gain can be increased to measure small errors When the X5 setting is selected the graticule marks correspond to 0 4 and 1 Line time distortion measurements can also be made using the voltage cursors in the RELATIVE mode Define the amplitude difference between blanking level and the bar center as 100 Now move both of the cursors to measure the peak to peak tilt This number is the line time distortion Remember to ignore the fir
17. sheltered locations where neither terrperature 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 UL1244 RecognizedTesting Standard for electrical and electronic measuring and test Laboratory Listing equiprrent Canadian Certification CAN CSA C22 2 No 231 CSA safety requirerrents for electrical and electronic measuring and test equipment European Union Low Voltage Directive 73 23 EEC amended by 9369 EEC Compliance EN 61010 1 Safety requirements for electrical equipment for rreasurerrert control and laboratory use Additional IEC61010 1 Compliance Safety requirerrents for electrical equipment for rreasurerrert control and laboratory use Safety Certification Corrpliance Terrperature operating 45 to 440 C 1780R Series Operator s Manual Specifications Table 5 14 Certifications and compliances Cont Altitude maxinum operating Equiprrert Type Safety Class Overvoltage Category Pollution Degree 2000 rreters Test and rreasuring Class 1 as defined in IEC 1010 1 Annex H grounded product Overvoltage Category II as defined in IEC 1010 1 Annex Pollution Degree 2 as defined in IEC 1010 1 Note Rated for indoor use only 1780R Series Operator s Manual Options and Accessories sU CR
18. 6 1 Vector 1780R Series Operator s Manual Index NTSC 3 6 PAL 3 7 Waveform NTSC 3 12 PAL 3 12 XY graticule scale 3 9 H Hold for function switches 2 1 Horizontal gain adjustment waveform 3 45 Horizontal position control 2 5 Horizontal position control calibra tion 3 43 How to Adjust calibrator amplitude zero set 3 45 Adjust external horizontal gain waveform 3 45 Adjust horizontal gain waveform 3 45 Adjust readout intensity vector 3 46 Adjust readout intensity waveform 3 43 Adjust scale illumination 3 6 Adjust trace rotation vector 3 46 Adjust trace rotation waveform 3 43 Calibrate the horizontal position control 3 43 Change the password 3 35 Enable disable the password 3 34 Enter exit a menu 4 1 Recall initial settings 3 37 Recall preset settings 3 36 Recover a saved instrument configuration 3 37 1780R Series Operator s Manual Store a new preset 3 15 3 39 Use the password 3 35 Zero set voltage cursors 3 45 Incidental Carrier Phase Modula tion ICPM 4 17 System B G or I 3 53 Zero carrier 4 18 Incorrect password 3 35 Input channel connectors 2 16 Input channel switches 2 15 Inputs AC DC coupled 3 53 Intensity control 2 3 Internal reference 2 12 3 55 K K Factor measurement 4 20 L Large knob precision measure ment control 2 5 2 7 3 6 Associated switches buttons 2 5 2 7 3 6 Line select 3 3 Phase sh
19. AC On FIELD TRIG F1 9600 SLOW SWEEP TRIG X1 FRONT INPUT Hz BP VECTOR PAL 1781R only IRE 1780R mW 1781R The Preset menu LED will stay on until the menu is exited INIT is displayed in the upper right portion of the CRT Exit Initial Settings Use one of these two methods to exit the Preset menu 1 Exit by pushing the front panel PRESET menu button and the instrument returns to its previous settings 2 Exit by changing any right side front panel control and the instrument continues to operate at the Initial settings allowing modifications by the operator Recover lt RECOVER gt only appears on the CRT after 1 2 3 Preset menu is entered Initial or Preset setting is recalled Preset menu is exited by modifying the recalled Initial or Preset setting Preset menu is re entered by pushing front panel PRESET menu button Push PRESET button to enter Preset menu Touch lt INIT gt or any of the 12 presets 1780R Series Operator s Manual Operating Instructions As soon as any right side front panel control setting is changed the instrument settings as configured before that change are saved and the Preset menu is exited To recover saved configuration push the PRESET button again and then touch lt RECOVER gt If the Preset menu is exited by pushing the PRESET button instrument configuration will not be saved Store Presets can be used to store instrument front p
20. Amplitude Staircase Operating Signal Max AC signal volts Sweep Length RGB YRGB Sweep Repetition Rate Performance Requirements A 410 V input will result in a horizontal display of 9 divisions 1 4 major divisions DC Signal levels plus peak AC not to exceed 12 to 412 volts 12 V peak to peak Field or line rate of displayed video or extemal sync signal as selected by frontpanel HOR IZONTAL controls Supplemental Information Ground to HO V HOV corresponds to left side of the CRT Field or line rate sweeps 2 Fiad 27 33 0f nor mal 1 Line 27 33 of nonrel 2 Line 27 33 of nonrel 2 Field 20 25 of nor rral 1Line 20 25 of nonrel 2 Line 20 25 of nonrel Requires 1H or 1Fld sweep selection External Horizontal Input Used for ICPM rreasure rrerts Sensitivity Input Inqpedance 5 10 Direct coupled O 5 V Sawtooth input of up to 5 V is nominally a 10 division horizontal sweep 10KQ 1780R Series Operator s Manual Specifications Table 5 5 Waveform Monitor DG and DP Display Supplemental Characteristics Information Differential Gain Deflection Factor 5 dG deflects the trace 50 IRE VWaveformmgain X1 Var NTSC or 500 mV PAL 5 gain off Vector gain ad justed to place chrorra at compass rose Residual dG 10 90 APL mme fen Resolution Accuracy 0 1 10 of reading Range Differential Phase Defle
21. Assignments 3 11 Figure 3 6 1780R Waveform Graticule 3 12 Figure 3 7 1781R Waveform Graticule 3 13 Figure 3 8 REMOTE Connector Pin Assignments 3 15 Figure 3 9 Serial Interface Connector Pin Assignments 3 18 Figure 3 10 Serial Interface Connector Wiring Converter 3 19 Figure 3 11 Portion of the 1780R Series Front Panel 3 21 Figure 3 12 Offsets Menu Screen LL 3 24 Figure 3 13 WFM CAL Readout with ABS selected 3 28 Figure 3 14 WFM CAL Readout with REL selected 3 28 vi 1780R Series Operator s Manual Table of Contents Figure 3 15 Left Side of Front Panel showing Menu Buttons and Touch Screen llle 3 31 Figure 3 16 Touch Screen 4 X 4 Matrix 3 33 Figure 3 17 Password Menu Screen sse 3 34 Figure 3 18 Preset Menu Screen eeeeeeese 3 36 Figure 3 19 Name Menu Screen eese 3 41 Figure 3 20 Waveform Calibration Menu Display 3 44 Figure 3 21 Vectorscope Calibration Menu Display for 1780R NTSC software versions 1 11 amp Up with CAL OSG OFF 51 5 ey ye RE RI CRDI amp 3 47 Figure 3 22 Vectorscope Calibration Menu Display for 1780R NTSC software versions 1 11 amp Up with CAL OSC ON eeeeeeee een nnn 3 48 Figure 3 23 Vectorscope Calibration Menu Display for 1781R PAL all software versions and for 1780R NTSC software versions 1 10 a
22. In Phase Shift it stores the currently displayed phase as a reference and resets the readout to 0 00 In Voltage Cursor mode with RELATIVE selected it stores the currently displayed voltage as a reference and resets the readout to 100 0 dB In Line Select mode it is used to access the vertical interval line 19 14 KNOB The Precision Measurement control large knob operates with selected functions to provide continuous adjustment 15 These switches operate with selected functions to provide single step adjustment The readout increments are the same as those for the Precision Measurement Control 1780R Series Operator s Manual 27 Connectors Controls Indicators Menu Access Switches NOTE Detailed menu information is located in Section 3 16 PRESET This switch provides access to the Preset menu screen which allows the user to store recall and name up to 12 complete instrument setups 17 MEASURE This switch provides access to the Measurement menu screen Selections made by touching the screen are DIFF PHASE DIFF GAIN DP amp DG NOISE ICPM K FACTOR CHROMA LUMA SHORT TIME DISTORTION RY SWEEP BOWTIE and FSC TIME MARKS Measure menu selections including user modified instrument configuration can be stored and recalled through the Preset menu When a preset containing a measurement mode is recalled the instrument will automatically reenter that measurement mode 18 CONFIGURE This swi
23. Sweep Mode Front Panel Configuration VECTORSCOPE Vector or SCH Selected by operator Other choices locked WAVEFORM Wavefomrmdisplay enabled other choices locked INPUT Status does not change REFERENCE Status does not change FILTER Locked WFM SWEEPS Two Field is selected Other choices may be made by operator GAINS Gain control settings selected by operator are saved and reinstated each tirre the R Y Sweep nod is enabled WAVEFORM POSITION Horizontal and Vertical Position control settings selected by operator are saved and reinstated each tine the R Y Sweep mode is enabled VOLTAGE amp TIMING Both Voltage and Tirring cursors are available CURSORS Exit R Y Sweep Measurement Mode To exit the R Y Sweep mode push the MEASURE button again All instrument settings return to their previous state R Y Sweep Mode Information The 1780R Series R Y Sweep mode provides a voltage versus time display on the waveform monitor CRT of the vectorscope R Y demodulator output 1780R Series Operator s Manual 4 31 Measurements Using R Y Sweep Mode 1 Setthe burst to 180 on the vector graticule The R Y compo nent of the input signal is viewed on the waveform CRT 2 Setthe front panel VECT SCH INPUT selection to SCH and the SCH Phase component is added to the R Y display The SCH Phase display is proportional to the amplitude of the R Y display and has a rise time of approximately 70 horizontal lines 3
24. To obtain the Offset menu touch OFFSET MENU until ON is outlined Touch OFFSET until VAR is outlined and touch CH B2 or CH B3 to assign large knob function to desired offset If only two input channels are selected the menu will only provide one offset Using the large knob adjust offset of the selected display with respect to the other two displays 3 26 1780R Series Operator s Manual Operating Instructions WFM CAL NOTE Switch function is further described in Section 2 Enter WFIM CAL Mode Select the WFM CAL mode of operation by pushing the WFM WFM CAL button shown in Figure 3 11 until the WFM CAL LED lights Two pushes may be required depending on the previous condition The WFM CAL display appears on the right CRT Sample readouts are shown in Figures 3 13 and 3 14 General WFIVL CAL Information The WFM CAL mode provides an accurate measurement tool which can be used to measure such things as burst amplitude sync tip to white bar amplitude and color bar amplitude The WFM CAL signal consists of a video signal superimposed on a calibrator signal The video signal is displayed twice with one display offset from the other by the voltage level of the calibrator When operating in the VAR mode the large knob will vary the Calibrator amplitude allowing accurate amplitude measurement over a continuous range when operating in lt FIX gt it will not Fixed Calibrator
25. amplitude is selected on page 1 of the Configure menu 1780R Series Operator s Manual 3 27 Operating Instructions Right CRT display 10 0 usiDIV E we a z 1000 mV setate rites Satire ee ener A f NEAN ABS REL selection present in software i 1781R versions 1 11 and up PAL Figure 3 13 WM CAL Readout with ABS selected Right CRT display 10 0 usiDIV ABS FIX De i0 pw ABS REL selection present in software versions 1 11 and up Figure 3 14 WM CAL Readout with REL selected 3 28 1780R Series Operator s Manual Operating Instructions When operating in the VAR mode software versions 1 11 amp Up provide a choice of absolute or relative readouts When ABS is selected the readout appears in IRE or mV For an IRE readout IRE must be selected on page 2 of the Configure menu When REL is selected the readout is given in both dB and percentage values relative to a reference that is selected by pushing the REF SET button Software versions below 1 11 provide a relative readout only Making Measurements Using VAR and ABS This mode provides accurate amplitude measurements in IRE or mV values An example of the readout is shown in Figure 3 13 calibrator signal not shown 1 Enter the WFM CAL mode Use the touch screen to select VAR and ABS Select Two Line sweep and Flat filter Apply a color bar signal to the 1780R Series 2 To measure th
26. appropriate preset The stored measurement mode including the user modifications will be recalled Both Preset and Measure LEDs will be on Making Measurements Detailed instructions for each measurement are given in Section 4 3 58 1780R Series Operator s Manual Measurements Measurements Measurement Information SELECT MEASUREMENT PRESET MEASURE CONFIGURE K FACTOR CHROMA TIME xd DISTORTION i Available for CALIBRATE TIME 1780R MARKS NTSC ONLY Figure 4 1 Measure Menu Access NOTE The measurements described in this section are accessed through the Measurement menu shown in Figure 4 1 Push the front panel MEASURE button to enable the Measurement menu To access a desired measurement mode touch the corresponding area on the Measurement menu screen To exit a measurement mode push the front panel MEASURE button again In the case of DIFF GAIN and DIFF PHASE 1780R Series Operator s Manual 4 1 Measurements measurements touch the GO TO DIFF PHASE and GO TO DIFF GAIN areas of the screen to alternate between those two measurement modes To perform additional measurements push the MEASURE button and touch the next desired measurement Differential Phase Measurement Enter DIFF PHASE Mode Push the MEASURE button to enable the Measurement menu shown in Figure 4 1 Touch DIFF PHASE gt on the screen The DIFF PHASE
27. cases except touch screen selection A Click Occurs When A touch screen selection is made Click cannot be disabled Touch Screen Both CRTs are equipped with 4 x 4 four vertical and four horizontal divisions LED matrix touch screens to provide menu access to additional instrument functions Selections are made by touching the desired function on the CRT screen Instructional labels such as SELECT MEASUREMENT are shown on the CRT screen in italics Touching the CRT screen is indicated in this manual by the use of the word touch as opposed to push for front panel switches A click indicates that a touch screen selection has been made If two or more choices are available the current selection will be outlined on the screen If a menu choice is not displayed nothing will happen when the screen is touched A circle around a menu choice indicates the current assignment of the large knob 2 2 1780R Series Operator s Manual Connectors Controls Indicators Front Panel Controls NOTE Locations for the following controls are shown in Figure 2 1 Power 1 POWER The Power push button switch turns the instrument on or to standby status and displays a colored spot inside the switch when power is on CHT Controls The five CRT controls Focus Scale Intens VPOS and HPOS are used to adjust both CRTs Assignment of these controls from one CRT to the other is controlled by two i
28. 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 Contacting Tektronix Pr
29. 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 CAUTION WARNING Double Protective Ground Refer to Manual High Voltage Insulated Earth Tenvinal 1780R Series Operator s Manual Getting Started xmv a ess SF Getting Started Documentation Overview This operator s manual is one of a set of two manuals that document the Tektronix 1780R Series Video Measurement Set To purchase a service manual please refer to the Contacting Tektronix page located near the front of this manual for address and phone number information The topics covered in the two manuals are as follows Operator s Manual Section 1 Document Overview Product Overview Installation Section 2 Connectors Controls Indicators including front and rear panel illustrations Section 3 Operating Instructions including menus Section 4 Measurements Section 5 Specifications Section 6 Options and Accessories Service Manual Installation Theory of Operation Performance Check and Adjustment Procedure Maintenance Options Replaceable Electrical
30. designations The installation categories are CAT IIl Distribution level mains usually perrranently connected Equipment at this level is typically in a fixed industrial location CAT Il Local level mains wall sockets Equipment at this level indudes appliances portable tools and similar products Equipment is usually cord connected CAT Secondary signal level or battery operated circuits of electronic equiprrent Pollution Degree A rreasure 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 1780R Series Operator s Manual Specifications Table 5 14 Certifications and compliances Cont Safety Standards U S Nationally Pollution Degree 1 No pollution or only dry nonconductive pollution occurs Products in this category are generally encapsulated herrretically sealed or located in dean rooms Pollution Degree 2 Normally only dry nonconductive pollution occurs Occasionally a terrporary conductivity that is caused by condensation must be expected This location is a typical office horre erwronrrent Tenporary condensation occurs only when the product is out of service Pollution Degree 3 Conductive pollution or dry nonconductive pollution that becomes conductive due to condensation These are
31. shown in Figure 2 2 22 VECT SCH Push and release this switch to toggle between Vector and SCH phase display for the vectorscope CRT Push and hold to access SCH phase and Vector together 23 XY PIX Push and release this switch to toggle between XY and Picture Monitor display for the vectorscope CRT Push and hold to add XY to the current VECT SCH selection Push and release to exit held mode 24 PARADE OVERLAY Push and release this switch to toggle between Parade and Overlay modes Possible configurations are shown in Table 2 1 Table 2 1 Possible Parade and Overlay Configurations Display Possible Inputs Automatic Selections Parade No access beep sounds If ONE LINE is selected in Overlay or Waveformmrrode instrument reverts to ONE LINE TWO LINE or THREE LINE when Parade is selected TWO LINE CHA and Probe or If CH B1 CH B2 and CH B3 are CH B1 ard Probe or selected the instrument will revert to CHA and CH B1 or THREE LINE rrode CH B1 CH B2 and CH B1 CH B3 Bow tie THREE LINE CH B1 and CH B2 and If any corrbination of two input CHB3 channels is selected the instrument Wil revert to TWO LINE node 1780R Series Operator s Manual 2 11 Connectors Controls Indicators Table 2 1 Possible Parade and Overlay Configurations Cont Display Possible Inputs Automatic Selections Overlay CH B1 and CH B2 or If TWO LINE or THREE LINE opera CH B1 ard CH B3 or tion is selected instr
32. shown in Figure 2 3 1 aAa Ww PV 10 1 CH A CH A accepts composite or component video signals CH B1 CH B1 accepts composite or component video signals CH B2 CH B2 accepts composite or component video signals CH B3 CH B3 accepts composite or component video signals XY INPUT XY is a 15 pin D type connector used as a high impedance input for the 600 Q balanced audio XY operation is described in Section 3 The connector pinout is shown in Figure 3 5 on page 3 11 EXT CW REF CW connector accepts input for continuous subcarrier signal Provides an external phase reference signal LINE STRB OUT LINE STRB OUT is a TTL output that provides a negative going pulse for the selected line s when Line Select is used When Line Select is off the output level is low AUX OUT AUX OUT provides a 75 2 video signal output before filtering AUX OUT can be used with the AUX IN to use custom filters PIX MON OUT PIX MON OUT connector provides a 75 Q output to drive a picture monitor The signal is output before filtering and has a bright up pulse added when Line Select is used AUX IN AUX IN provides a 75 Q input for video signals to the waveform monitor Signal is inserted after the internal filters EXT REF External Reference connector accepts either composite sync or black burst 1780R Series Operator s Manual Connectors Controls Indicators n Suis INIT Xnv NOWXId XNY ZIMO
33. the distance from the graticule circle to the graticule center 1780R Series Operator s Manual 3 9 Operating Instructions 3 10 XY INPUT Connector The rear panel XY INPUT connector is a 15 pin sub miniature D type connector that provides input to the Horizontal and Vertical X and Y Amplifiers They are balanced differential DC coupled high impedance gt 20 KQ un terminated inputs provided for audio applications If AC coupling is desired external capacitors are required These inputs are factory calibrated for 0 dBm in 600 2 but can be adjusted for any 600 2 system between 0 and 12 dBm See Figure 3 5 0 dBm is equal to 1 mW or 2 19 V peak to peak in 600 Q 12 dBm is equal to 15 8 mW or 8 72 V peak to peak in 600 Q To calibrate the 1780R Series for a system other than 0 dBm perform step 38 of the Adjustment Procedure in the 1780R Series Service Manual using a 1 kHz sine wave of the appropriate amplitude Inputs can be driven single ended by driving either the or X and Y inputs with the opposite polarity inputs grounded In addition a single ended high gain mode can be used for other primarily non audio applications It can be accessed by installing plug jumpers on J108 and J205 on the Vectorscope board see Table 3 1 and inputting the signal on the X and Y inputs with the X and Y inputs grounded Table 3 1 Plug Jumpers for Vectorscope Board Jumper Number Name Plug Position Purpose J 1
34. the product is properly grounded Observe All Terminal Ratings To avoid fire or shock hazard observe all ratings and markings on the product Consult the product manual for further ratings information before making connections to the product Do not apply a potential to any terminal including the common terminal that exceeds the maximum rating of that terminal Do Not Operate Without Covers Do not operate this product with covers or panels removed Use Proper Fuse Use only the fuse type and rating specified for this product Avoid Exposed Circuitry Do not touch exposed connections and components when power is present Wear Eye Protection Wear eye protection if exposure to high intensity rays or laser radiation exists Do Not Operate With Suspected Failures If you suspect there is damage to this product have it inspected by qualified service personnel 1780R Series Operator s Manual xi General Safety Summary xii Do Not Operate in Wet Damp Conditions Do Not Operate in an Explosive Atmosphere Keep Product Surfaces Clean and Dry Provide Proper Ventilation Refer to the manual s installation instructions for details on installing the product so it has proper ventilation Safety Terms and Symbols Terms in This Manual These terms may appear in this manual WARNING Warning statements identify conditions or practices that could result in injury or loss of life CAUTION Caution statements identify
35. the same way as with the 1720 Differential gain dG and differen tial phase d measurements can be made using the graticule markings located at the outer edge of the B Y axis NTSC or U axis PAL Differential gain appears as an elongation of the chrominance dot Measure the horizontal distance from end to end Minor graticule divisions represent 5 error and major divisions represent 10 Differential Phase appears as a vectorial offset of the chrominance dot Measure angular difference using the Differential Phase graticule markings along the edge of the compass rose Measuring from the 0 mark on the B Y or U axis each minor division represents 2 of error the major divisions represent 10 and the dashed lines half way in between represent 5 of Differential Phase error XY Measurements The 1780R Series vectorscope graticule contains markings for measuring stereo audio phase and amplitude The dashed diagonal line is the measurement axis for errors less than 90 and is terminated in amplitude targets that correspond to the length of the X and Y axes These target boxes in the upper right and lower left of the display correspond to amplitude errors of 1 2 and 1 dB The upper half of the Y axis has markings in 10 increments for measuring the separation of the Lissajous Both X and Y axes have 3 dB markings making it easy to check the bandpass of the amplifiers The 3 dB points are minor breaks in the line about 3096 of
36. 08 X Input Gain Rerroved T X gain is normel Installed X gain is in High Gain position J205 Y Input Gain Rerroved T Y gain is normal Installed Y gain is in High Gain position T Factory installed position 1780R Series Operator s Manual Operating Instructions Pin Number Function 1 X Input 2 No Connection 3 X Input 4 No Connection 5 Y Input 6 No Connection 7 4Y Input 8 No Connection 9 X Input 10 Ground 11 X High Gain Input 12 Ground 13 Y Input 14 No Connection 15 Y High Gain Input Figure 3 5 Rear panel X Y Connector Pin Assignments 1780R Series Operator s Manual 3 11 Operating Instructions Using The Waveform Graticule Basic Waveform Graticule Markings The two basic 1780R Series internal waveform graticules are the NTSC and PAL graticules The NTSC graticule is shown in Figure 3 6 and the PAL graticule is shown in Figure 3 7 External graticules short time distortion for NTSC and CCIR K factor for PAL are also available in full scale and in a 3 reduced photo version jin meere IERI pea av Figure 3 6 1780R Waveform Graticule 3 12 1780R Series Operator s Manual Operating Instructions Figure 3 7 1781R Waveform Graticule Graticule horizontal scales are divided into 12 7 divisions along the horizontal line at blanking level The vertical graduations are scaled according to measuring units and ranges unique to each system
37. 2 of 4 Field reference is selected the FIELD area in the lower right corner of the screen will toggle between Fields 1 and 3 or Fields 2 and 4 when 1 of 4 is chosen it will allow selection of Field 1 2 3 or 4 and when 1 of 8 present in software versions 1 11 and up is chosen it will allow selection of Field 1 2 3 4 5 6 7 or 8 The selected field or field pair is boxed When lt ALL gt Fields is selected the FIELD area is no longer present in the lower right corner of the screen and all fields are overlaid To enable the Line Select menu first push the LINE SELECT front panel button then touch LSEL MENU on the vectorscope CRT until ON is outlined To exit the menu push the same area again until OFF is outlined Line Select menu choices are shown in Figures 3 1 and 3 2 Touch desired area to toggle between choices Current selection is outlined by a box Touch VECT 1H 15H or WEM 1H 15H gt to display the selected line 1H or display the selected line plus the next 14 overlaid 15 H 1780R Series Operator s Manual 3 3 Operating Instructions 1 OF B selection LINESEL present in software versions 1 11 amp Up WFM LSEL Figure 3 1 Line Select Menu Screen with lt 2 OF 4 gt Fields selected The waveform and vectorscope CRTs can be used to display the same selected line or different lines To display different lines enable the Line Select menu then touch lt WFM VECT g
38. 3 52 Toggling between pages 3 52 Index 1 Index Coupling AC DC GND 3 53 CRT controls 2 1 2 3 Cursors Time 2 5 3 1 Set interval 3 45 Voltage 2 6 3 2 Units mV IRE 3 54 Zero set 3 45 CW connector 2 16 CW reference 2 12 3 55 D DC level measurements 3 24 DC restorer slow fast off 3 53 Dead zone 3 43 Differential gain measurement 3 9 4 7 Differential phase and gain mea surement 4 12 Differential phase measurement 3 9 4 2 Differentiated step filter 2 14 Disable the beep 2 2 Disable the password 3 34 E Enable the password 3 34 Extender board kit for Oscillator and Z Axis circuit boards 6 2 External horizontal Connector 2 18 Gain 3 45 Input 3 42 External reference 2 12 2 16 3 55 Index 2 F Fsc time marks measurement 4 36 Fan filter standard accessory 6 1 Field trigger F1 F2 3 53 Filter 2 14 Air 6 1 AUX 2 14 Chrominance 2 14 Differentiated step 2 14 Flat 2 14 Low pass 2 14 Luminance 2 14 Flat filter 2 14 Focus control 2 3 Front panel controls 2 3 Knob assignment timeout ON OFF 3 55 Fuse replacement 6 1 G Gain External horizontal waveform 3 42 Horizontal waveform 3 45 Vector 3 46 Vertical waveform 3 45 Gain control vector 2 14 Gain control waveform 2 14 Ghost cancelling 3 3 Graticules 3 6 Diff gain and diff phase graticule scales 3 9 Part numbers 6 1 Replacement lamps
39. ASE Menu Selections 42 DIFF PHASE Measurement Information 4 5 Single Trace DIFF PHASE Measurement Procedure 4 5 Double Trace DIFF PHASE Measurement Procedure 4 6 Using Line Select in DIFF PHASE 4 6 Differential Gain Measurement 00 000000 4 7 Enter DIFF GAIN Mode 0 00000 a ee 4 7 Exit DIFF GAIN Mode 0 0 00000 aee 4 7 DIFF GAIN Menu Selections 0005 4 7 DIFF GAIN Measurement Information 4 10 Single Trace DIFF GAIN Measurement Procedure 4 10 Double Trace DIFF GAIN Measurement Procedure 4 11 Using Line Select in DIFF GAIN 4 11 Simultaneous Diff Phase amp Diff Gain Measurements 4 12 Enter DP amp DG Mode 0 0 cee ee 4 12 Exit DP amp DG Mode 0 0 cece 4 12 DP amp DG Menu Selections 00000005 4 12 DP amp DG Measurement Information 4 14 DIFF PHASE amp DIFF GAIN Measurement Procedure 4 15 Noise Measurement eese 4 16 Enter Noise Measurement Mode lees 4 16 Exit Noise Measurement Mode 0055 4 16 Noise Measurement Procedure 000055 4 16 ICPM Measurement lee 4 17 Enter ICPM Measurement Mode 4 17 Exit ICPM Measurement Mode 4 4 17 ICPM Measurement Information
40. Accessories 6 1 Adjustments Calibrator amplitude zero set 3 45 External horizontal gain waveform 3 46 Gain vector 3 46 3 49 Horizontal gain waveform 3 45 Horizontal position control cal ibration 3 43 Readout intensity vector 3 46 3 51 Readout intensity waveform 3 43 Scale illumination 2 3 3 6 Trace rotation waveform 3 43 Vertical gain waveform 3 45 Voltage cursors zero set 3 45 Air filter fan 6 1 Audio feedback 2 2 Audio input XY INPUT connec tor 3 10 AUX filter 2 14 AUX IN connector 2 16 AUX OUT connector 2 16 Auxiliary input 2 14 2 16 B Baud rates 3 20 3 55 Beep 2 2 3 55 3 57 Bowtie measurement 4 33 1780R Series Operator s Manual C Cabinet portable optional acces sory 6 2 CAL OUT probe 2 9 Calibrate menu 2 8 3 42 Password access 3 43 3 46 3 49 Selecting vectorscope waveform calibration 3 42 Vectorscope calibration proce dure 3 46 Waveform calibration procedure 3 43 Calibrator amplitude Fixed 3 30 3 53 Variable 3 29 Zero set 3 45 Calibrator signal vector on off 3 46 3 51 Calibrator signal waveform on off 3 42 Chroma to Luma inequalities 4 23 Lissajous display 3 9 4 27 Chrominance filter 2 14 Clamp sync tip back porch 3 53 Color bar amplitude 75 100 3 54 Color framing 3 22 Communication serial remote RS232D RS422A 3 18 Companion switches 2 1 2 9 Configure menu 2 8
41. Accuracy Resolution 1780R Series Operator s Manual Specifications Table 5 2 Waveform Monitor Vertical System Cont Performance Supplemental Characteristics Requirements Information Cal Amplitude Accuracy LOOVLO 2 NTSC O714Vt05 Resolution 1nW at LOOV PAL 0 700 V 0 5 DC Restorer Clarrp Point Back porch or Sync Tip Mains HumAtten Attenuation 10 Slow Clarrp lt 0 9 cB Fast Clarrp 226 B Shift caused by pres NTSC 1 IRE ence or absence of PAL 7 nw burst LunyChroma Gain Ratio NTSC 11 1 Adjust to rrinirrize lurri 50 kHz 3 58 MHz nance to chrominance gain error at 1 V Full Scale PAL 1 1 1 50 kHz 4 43 MHz typically 0 5 Noise Measurerrerts Accuracy To 56 cB within 1 dB Relative to 700 rrVgws To 60 cB within 2 dB VAR GAIN adjusted to NANUM Offset Accuracy To 56 cB within 0 5 cB To 60 cB within 1 cB 1780R Series Operator s Manual Specifications Table 5 2 Waveform Monitor Vertical System Cont Supplemental Characteristics Information Vertical Overscan Baseline Distortion lt 7 MW variation in baseline of 1V p to p PAL or NTSC chroma when positioned any Modulated Sin composite where between sync tip and video signal 12 5T NTSC 100 white 10T PAL LO or X5 Variable Gain off Typically lt 0 5 DC Channel Matching feed B1 B3 T isum se Eam saan marmay 46 cB to 6 MHz and 3 58 or 4 43 MHz 234dB 234dB
42. Configure menus are shown on the left CRT with the vectorscope display blanked The Calibrate menu is available for both vectorscope and waveform selected by pushing the button under the desired CRT The green LED in the button lights when a menu is enabled To exit a menu push the same menu button again Menus will also be exited when another menu button is pushed with the exception that both the Preset and the Measure menu can be active at the same time Touch Screen Both CRTs are equipped with touch screens Four vertical and four horizontal divisions create 16 quadrants shown in Figure 3 16 Touching a quadrant enables the function or toggles between choices displayed in that quadrant Current selections functions are outlined by a box Current large knob assignment is circled 3 32 1780R Series Operator s Manual Operating Instructions docere Quadrant Outline 4 N Quadrant Center Point Figure 3 16 Touch Screen 4 X 4 Matrix The touch screens are light sensitive so it is not necessary to apply pressure If it is necessary to adjust quadrant center points refer to the 1780R Series Service Manual 1780R Series Operator s Manual 3 33 Operating Instructions Password Menu PRESET Vasyeskveskeresax rere ick wee ey rase a QS Vati ec Sie ie d Mecelaiomi RS O aet Be area ENTER PASSWORD TO ACCESS MENU Figure 3 17 Password Menu Screen Enable Disable the Password To enable passwo
43. ECTORSCOPE Vector display initially enabled other choices locked out Chrorre to Lurra Lissajous display selected by touching lt VECTOR CN area of screen WAVEFORM Waveformdisplay enabled other choices locked out INPUT Status does not change AI differential modes locked out if a differential mode wes enabled input is forced to CH A REFERENCE Status does not change FILTER Flat filter autorratically selected Other choices locked out WFM SWEEPS Sweep settings typically X10 or X20 Mag selected by operator are saved and re instated each tine the Chrona Lurra rrode is enabled GAINS Vectorscope and Vavefomngain settings selected by operator are saved and reinstated each tine the Chrona Luna noce is enabled WAVEFORM POSITION Horizontal and Vertical Position control settings selected by operator are saved and reinstated each tine the Chroma Luna noce is enabled VOLTAGE amp TIMING Voltage cursors are autorratically enabled Cursors can be CURSORS used to extract stored norrograph cata 3 Set Left Lobe Amplitude a Position Cursor 1 on the point of the left lobe that is furthest from the baseline Leave Cursor 2 on the baseline b Touch lt ENTER gt 4 Set Right Lobe Amplitude a Position Cursor 1 on the point of the right lobe that is furthest from the baseline If no right lobe is present indicating no delay error set Cursor 1 to the baseline Leave Cursor 2 on the baseline b Touch ENTE
44. EE EE Gs Options and Accessories Options The Power Cord options are the only currently available options for purchase with the 1780R Series Part numbers are listed below Accessories Standard Accessories The following accessories are shipped with the 1780R Series 1 O70 6890 XX 1780R Series Operator s Manual 3 150 1136 00 Graticule Lamp Incandescent 1 Replacerrert Cartridge Fuse 2 A Slow 250V 1 Graticule 511 1979 Visual 102 1780R ONLY 1 Graticule 511 1979 Photographic 1780R ONLY 1 Graticule K Factor Visual 1781R ONLY 331 0524 00 Graticule K Factor Photographic 1781R ONLY 378 0337 00 Filter Air AE 8 Cabinet VWaparound 1780R Series Operator s Manual 6 1 Options and Accessories One of the following cables is shipped with each instrument Qty Tek Part Number Description 1 161 0216 OO Cable Power 1 161 0066 0O9 Cable Power Option A1 220 V Euro 1 161 0066 10 Cable Power Option A2 240 V UK 1 161 0066 11 Cable Power Option A3 240 V Aust Optional Accessories The following is a list of the most common accessory items for the 1780R Series Description Tek Part Number 1780R Series Service Manual O70 8030 XX Extender Kit for Oscillator amp Z Axis Circuit Boards O16 1011 OO Viewing Hood 016 0475 00 Portable Cabinet 1780FC2 Rack Mourt Shelf 1780F05 6 2 1780R Series Operator s Manual Index A Absolute units mV IRE 3 54
45. H 1X3 a8 i ino Aw G3IOTIIHS ATIN3DDI3fIS N338 SVH LNAANULSNI SIHL NIH LIA O31 VANS NOISSIW3 AVUX aNnON9 HIN V3 OL 3153NNO2 38 ISMN ONNOY 3ALD31014 QUOD H3MOd Jay NO bis y2OHS 12212313 GIOAY OL ne iaveano 30N3H3ISLN3 LVH3D W3S310 NI dd Nolinv gt A1S31 8 SV3W 30 T3NNOSHAd m ITAYA IONA YNOd ANANI VS zH v9 8v es Gh AT 35n AYOL YHON xvwsivmoz 310W3H Qaisn Q31V N3d4WO2 H5bfhONH I 2001 Q5 SL 39V110A INN 18H52 za HD T ASIL AOIZ Figure 2 3 Rear Panel Connectors 2 17 1780R Series Operator s Manual Connectors Controls Indicators 12 EXT HORIZ The EXT HORIZ input connector allows external control of waveform monitor sweeps A positive going signal deflects the sweep from left to right A 0 V to 5 V signal is required for full scale deflection ICPM 13 SERIAL PORT This 9 pin D type connector provides a serial remote control interface compatible with both RS232 and RS422 standards Serial Port communications are described in Section 3 The connector pinout is shown in Figure 3 9 on page 3 18 14 REMOTE This 15 pin D type connector provides a ground closure remote control interface and signal inputs for Remote Sync and RGB YRGB Remote operation is described in Section 3 The connector pinout is shown in Figure 3 8 on page 3 15 2 18 1780R Series Operator s Manual hy Saas Operating Instructions SEE ESS Operating Instructions
46. Operator s Manual Tektronix P4 1780R Series Video Measurement Set 070 6890 08 This document supports firmware version 1 10 to 1 16 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 P O 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 service
47. Phase readout now gives the total amount of differential phase To measure the differential phase of each step in the signal repeat the process bringing each individual step together Using Line Select in DIFF PHASE 1 Push the front panel LINE SELECT button to enable Line Select mode Both the waveform monitor and vectorscope will be in Line Select and display the same line 1780R Series Operator s Manual Measurements 2 Line Select readout is provided on the waveform CRT Make sure the Line number is circled If it is not touch the screen in that area 3 Touch MENU to outline ON for Line Select menu display on the vectorscope CRT Make Line select menu choices as desired 4 Use large knob or lt gt buttons to change selected line Differential Gain Measurement Enter DIFF GAIN Mode Push the MEASURE button to enable the Measurement menu as shown in Figure 4 1 Touch DIFF GAIN on the screen The DIFF GAIN menu is displayed on the left CRT and the demodulator sweep is displayed on the right CRT as shown in Figure 4 3 The instrument is now configured as specified in Table 4 2 Exit DIFF GAIN Mode To exit DIFF GAIN mode push the MEASURE button again All instrument settings return to previous state To move from DIFF GAIN mode to DIFF PHASE touch the GO TO DIFF PHASE area of the screen Horizontal positions vertical positions and gain settings defined while in DIFF GAIN mode wil
48. R 5 Set Modulated Sine squared Pulse H A D 1780R Series Operator s Manual 4 25 Measurements If OTHER was selected on Step 1 this step allows the 1780R Se ries instrument to determine the pulse width and adjust the readout accordingly a Voltage cursors are automatically set to 5096 of the amplitude entered in step 2 b Timing cursors are enabled and appear as bright up dots on the display Large knob now controls timing cursor position c Adjust Timing Cursor 1 to the point where the pulse signal intersects the approximate 50 amplitude level identified by the Voltage Cursor d Adjust Timing Cursor 2 to the point where the opposite side of the pulse signal intersects the Voltage Cursor See Figure 4 8 CURSOR 1 PULSE TOP CURSOR 2 BASELINE TOUCH ENTER Cursor 1 setting eee a Cursor 2 setting 125T CURSOR 1 25 T TER Figure 4 8 Setting Timing Cursors to Pulse Width 4 26 1780R Series Operator s Manual Measurements Chroma Luma Measurements with Lissajous Display The Lissajous display is an X Y plot of the sine squared luminance pulse versus the sine squared envelope of the demodulated chrominance This display is useful when signals have previously been transcoded into a component format so that R Y and B Y may be unequally delayed with respect to luminance While still in the Chroma Luma measurement mode touch lt VECT C Y gt to outline lt VECT gt Set large knob func
49. Table 1 1 Rack Mounting Hardware Included Qty Description Part Number 2 Bracket Extension 2 5 X 8 06 X 0 06 Steel 407 3752 00 2 Nut Bar 3 10 32 X 3 0 X 0 375 X 0 125 Alurrinum 381 0251 00 12 Screw Machine 10 32 X 0 625 Steel 212 0577 00 4 Washer Flat 0 208 ID X 0 625 OD X 0 062 Steel 210 1061 00 A front clearance of at least 18 inches is required for removing the instrument from the rack BNC connectors on the rear panel extend approximately 0 6 inches making it necessary to have inch or more of rear clearance to have enough room to cable the instrument See Figure 1 2 for rack mounting dimensions 1780R Series Operator s Manual 1 5 Getting Started i 17 55 1875 9 ADJUSTABLE BRACKET e 19 6235 Figure 1 2 Dimensions used for rack mounting the 1780R Series Video Measurement Set 1 6 1780R Series Operator s Manual Getting Started RIGHT QOQOCOCOCXOQDOQOOQQUOGO OOQDOOOCQQOGOGOQCQ Figure 1 3 Dimensions of the adjustable rear rack mounting bracket To install the instrument in the rack First remove the four securing screws and take the instrument out of the rack mounting cabinet All 1780R Series instruments are shipped in the rack mounting cabinet to provide extra shipping protection Once the instrument is out of the cabinet mount the front of the cabinet in the rack using four 10 32 TORX screws Cabinet front slots are spaced
50. Vector calibration procedures or for more detailed procedures refer to the 780R Se ries Service Manual New settings are stored when the Calibrate menu is exited The Calibrate menu can be exited by pushing the CALIBRATE button again or by pushing another menu button To toggle the display between vectorscope and waveform calibra tion push the buttons under the CRTs When waveform is selected the waveform calibrator is displayed on the right CRT with waveform menu selections on the left CRT vectorscope display blanked When vectorscope is selected the arrangement is reversed Waveform Calibration Information The internal calibrator signal is selected by touching the lt CAL SIGNAL area of the screen until ON is outlined It automatically reverts to OFF when the Calibrate menu is exited and must be reselected if desired when the menu is reentered CAL signal is not available in CAL AMPL ZERO SET gt HORIZ POSITION KNOB CAL present in instruments with SN below B020245 VOLT CURSORS ZERO SET and CAL AMPL ZERO SET provide menu displays on the waveform CRT The current selection is indicated by a box on the vectorscope CRT and the large knob function is circled on the waveform CRT HORIZ CAL EXT HORIZ CAL VERT CAL READOUT INTENSITY and TRACE ROTATION are circled when selected to indicate large knob assignment An external 1 0 volt reference signal is required to calibrate the EXTERNAL HORIZONTAL INPUT
51. YNC input locks waveformrronitor vector scope also requires CVV signal SCH Modes 286 rV 300 mV PAL Sync Corrposite Video or Black and Burst t3 cB Burst Direct Sync Frequencies rruch below 15 75 kHz will not pemita nomal TV display Horiz Freq Range Sync itter Comp sync or lt 12 rs with respect to input video sync Variable APL lt 20 ns with the addition of 10 90 36 cB white noise lt 90 ns lt 250 ns jitter 1 V compos ite video with 26 dB white noise Noise Irrrrunity 1780R Series Operator s Manual 5 13 Specifications Table 5 6 Synchronization Cont Characteristics AFC Sync Horiz Freq Range Lock In Tire Sync itter Comp sync or video Variable APL 10 90 J itter with respect to white noise Noise Irrrrunity J itter from missing line Performance Requirements 15 75 kHz 200 Hz lt 1 second Supplemental Information lt 10 ns with the addition of 36 dB white noise lt 12 ns Doubles with each 6 dB increase in white noise lt 90 rs jiter 1 V composite video with 26 dB white noise lt 15 ns per missing sync sync pulses pulse Maxinnumof 10 consecutive line sync pulses Slow Sweep Triggering Signal APL change from lt 10 90 Front panel selectable for either or level change Sersitivity O 4 V to 2 0 V peak to peak composite video with APL change Rate 20 2 Hz Free runs at rates less than 0 2 Hz
52. a cabinet either the rack mount cabinet or the portable case 1780F02 The 1780F02 case has a handle and front and back covers The front and back covers provide protection for the instrument during transportation and storage NOTE Cabinet drawings are provided for installation information only and are not to scale All dimensions are in inches The rack mounting cabinet is a standard accessory all instruments are factory shipped in this cabinet Rack mounting hardware is included and listed in Table 1 1 The portable case 1780F02 is available from Tektronix as an Optional Accessory It as does the rack mounting cabinet provides the proper electrical environment for the instrument supplies adequate shielding minimizes handling damage and reduces dust collection within the instrument Rack Mounting 14 The 1780R Series rack mounting cabinet is designed for permanent mounting The instrument slides in and out of the cabinet with relative ease The instrument is secured in the cabinet with four 6 32 TORX drive screws See Figure 1 1 1780R Series Operator s Manual Getting Started 6 32 MOUNTING SCREWS Figure 1 1 Location of the four screws that secure the instrument to rack mounting cabinet or portable case WARNING Do not attempt to carry a cabinetized instrument without installing the rear panel mounting screws There is nothing to hold the instrument in the cabinet if it is tipped forward
53. able 4 10 Fac Time Marks Front Panel Configuration VECTORSCOPE SCH display autorratically enabled other choices may be selected by operator WAVEFORM Wavefomrmdisplay enabled other choices may be selected by operator INPUT Status does not change REFERENCE Status does not change FILTER Status does not change WFM SWEEPS Sweep and Mag settings selected by operator are saved and reinstated each tine the Fsc tine marks rrode is enabled GAINS Gain settings selected by operator are saved and reinstated each tine the Fec tine marks rrode is enabled WAVEFORM POSITION Horizontal and Vertical Position control settings selected by Operator are saved and reinstated each tine the Fec tine rrarks mode is enabled TIMING CURSORS Tirring Cursors are nct available Exit Foc Time Marks Measurement Mode To exit Fsc Time Marks mode push the MEASURE button again All instrument settings return to their previous state Phase set while in Time Marks mode is stored and reinstated each time this mode is selected 4 36 1780R Series Operator s Manual Measurements Making SCH Phase Measurements The 1780R Series offers two methods of measuring SCH phase errors The polar SCH display and this Fsc Time Marks voltage vs time method The Fsc time marks display is more direct than the polar display and affords the operator more manual control but may provide a less precise measurement To ensure an accurate measurement both metho
54. and Mechanical Parts Lists with accessory part numbers Schematic Diagrams and Circuit Board Illustrations 1780R Series Operator s Manual 141 Getting Started Documentation Conventions Within this manual front panel push button names are shown all in capitals such as the PRESET menu button Touch screen words are represented in brackets such as DEFAULT CRT instructional labels such as SELECT MEASUREMENT are represented in italics in the manual and on the instrument CRT In menu operation most selections are made by actually touching the desired area on the CRT screen This is indicated in the manual instructions by the use of the word touch as opposed to push for front panel push buttons Who Should Use This Operator s Manual This operator s manual contains information necessary for daily use and is appropriate for use by anyone who operates the 1780R Series Video Measurement Set The service manual is intended for use by qualified service personnel only 1780F Series Product Overview 1 2 The 1780R Series Video Measurement Set is a wide bandwidth multi input waveform vector SCH measurement package The advantages of separate waveform and vector instruments are provided in a single package Specific measurements take advantage of the 1780R Series shared waveform monitor and vectorscope internal processing Separate waveform and vectorscope CRTs allow simultaneous monitoring of several v
55. and wide enough to accommodate standard racks Next mount the adjustable brackets to the rear rack section See Figure 1 3 for bracket dimensions Then mount the adjustable brackets to the rack mount cabinet using four 10 32 TORX screws four number 10 flat washers and the nut bars See Figure 1 4 for more assembly detail Finally re install the four 6 32 screws that secure the instrument to the rack mounting cabinet See Figure 1 1 1780R Series Operator s Manual 17 Getting Started 1 8 I e l 2 4 ADJUSTABLE BRACKET j CABINET MOUNTING SLOTS ADJUSTABLE REWS i BRACKET SOREN IM 18 gt i WASHERS l RIGHT g REAR MOUNTING SLOTS FRONT MOUNTING 4 SLOTS NUT j BAR Figure 1 4 Installing rear rack mounting brackets for rack applications of depths from 18 to 24 inches NOTE For ease of installation place the nut bars to the outside of the adjustable brackets and drive the screws from the center into the nut bars For applications where it is necessary to rack mount the instrument but have it removable with the instrument case order the 1780F05 Rack Mount Shelf 1780R Series Operator s Manual Getting Started Options The 1780R Series is shipped with a standard U S plug or can be ordered with one of the following options Option A1 220 V European plug Option A2 240 V United Kingdom plug Option A3 240 V Australian plug These are th
56. anel configurations and user modified measurement setups Store a new setup m Configure items to be stored Wm Push PRESET button to enter Preset menu m Touch STORE If password is enabled enter the password now m WHICH PRESET is added to the display STORE lt RECOVER gt lt NAME gt and INIT are omitted m Touch desired preset name Example PRESET 9 will now be outlined on touch screen CAUTION When PRESS HERE TO STORE is touched the A N previous configuration stored under that preset Preset 9 in this example will be written over If this is not desired push the PRESET menu button now to exit the menu without making changes W To store the new setup and return to the Preset menu touch PRESS HERE TO STORE m To exit the Preset menu without storing the new setup push the PRESET menu button 1780R Series Operator s Manual 3 39 Operating Instructions Name Renaming a PRESET Push the PRESET button to enter Preset menu Touch Name If password is enabled enter the password now lt RENAME WHICH is added to the display lt STORE gt lt RECOVER gt lt NAME gt and INIT are omitted Touch the preset to be renamed Example PRESET 1 The Name menu screen shown in Figure 3 19 is displayed Push the buttons marked lt gt under large knob to select the digit to be changed The selected character is now outlined on the screen Rotate the
57. assword 000000002 eee 3 35 Use the Password 0 0 0 ccc ccc cece 3 35 Incorrect Password 00 ccc ccc cee eens 3 35 Preset Menu s sacs tae da ER E EE nec ae IE 3 36 Recalls9 cs td rU como no een Ad asi 3 36 RECOVER cuis hs rure SG ep UI UE UE E 3 38 DIOIGS erstes ohne te deo E ER eue Sor tos 3 39 Nate ceres rss DEG Edel PE EA UE 3 40 Calibrate Menu leeeeeeeee eee nee 3 42 General Calibration Menu Information 3 42 Waveform Calibration Information 3 42 Waveform Calibration Procedure 000 3 43 Vectorscope Calibration Information 3 46 Vectorscope Calibration Procedure 3 46 Vectorscope Calibration Procedure su 3 49 Configure Men nsss ite rne eane e a es 3 52 Changing Configurations 000005 3 52 1780R Series Operator s Manual iii Table of Contents Measure Menu lese RR n 3 56 Using the Measure Menu 0004 3 56 Beep ei wh estar cute iride ae A ed ae oe eec 3 57 Store and Recall Modified Setups suus 3 57 Making Measurements 0 0000005 3 58 Measurements Measurement Information 0 0 0 0 0 0c eee ee eee 4 1 Differential Phase Measurement 000005 42 Enter DIFF PHASE Mode 0000005 42 Exit DIFF PHASE Mode 000005 42 DIFF PH
58. ation menu then push the button under the left CRT a Apply a color bar signal with 7 596 Setup for NTSC to a 1780R Series input channel and select that channel for display A 100 or 75 color bar signal can be used depending on the vectorscope readout derived from the Configure menu setting b Push the front panel PHASE button and adjust the large knob to properly align the phase of the burst and vectors on the graticule Push the PHASE button again to exit this mode For 1780R NTSC Touch GAIN 1 CAL Check that the color bar vectors are in the graticule boxes Set the generator to 096 Setup touch GAIN 2 CAL NO SETUP and check that the color bar vectors are in the graticule boxes Return the generator to 7 596 Setup if desired For 1781R PAL Touch GAIN CAL Check that the color bar vectors are in the graticule boxes d Exit Calibrate menu Vectorscope Calibration Procedure for Software Versions 1 10 amp Below Perform Steps 1 through 6 for both 1780R and 1781R NTSC and PAL 1 Push the front panel CALIBRATE button to enter the Calibration menu If Password operation is enabled enter the password now Waveform calibration will be displayed 2 Push the button under the left CRT LED will light to select Vectorscope calibration shown in Figure 3 23 1780R Series Operator s Manual 3 49 Operating Instructions uonesgye gt ado s20222A pue uL 0gaAe M u am q 2 660 0 SLu248
59. ay informing the user of denied access and exits the Name Store or Calibrate menu screen These menu screens can also be exited by pushing the PRESET or CALIBRATE button again or by disabling the Password according to the preceding instructions NOTE If the operator has reduced the Readout Intensity via the Calibrate menu then attempts to exit and re enter that menu the Password menu may not be visible and instrument functions may appear to be locked up Temporarily returning the instrument to non password operation will allow re entry of the Calibrate menu 1780R Series Operator s Manual 3 35 Operating Instructions Preset Menu PRESET PRESET i PRESET2 PRESET3 PRESET4 PRESET 10 PRESET 11 PRESET 12 RECOVER Figure 3 18 Preset Menu Screen Recall Recall Preset Settings Push PRESET button to enter Preset menu shown in Figure 3 18 Recall desired preset by touching the preset name Example lt PRESET 9 Instrument is reset to configuration stored under that preset menu screen disappears and selected preset name is displayed in the upper right of the vectorscope CRT While the Preset LED is still on pushing it will cancel the recall The LED is turned off by any front panel activity 3 36 1780R Series Operator s Manual Operating Instructions If a Measure menu selection for example user modified R Y SWEEP setup has been stored at a Preset location recalling it w
60. binary data interchange Figure 3 9 shows the rear panel SERIAL connector pin assignments Ground RS232D Receive NC RS422A Transmit 1 R 232D Transmit RS422A Transmit 2 RS422A Receive 1 RS422A Receive 2 RS232D Signal Ground Figure 3 9 Serial Interface Connector Pin Assignments Building a Wiring Converter Wiring converters can be built to connect the 1780R Series 9 pin SERIAL port with another 9 pin connector or with a 25 pin connector The 25 pin converter uses a 9 pin male connector Tektronix P N 131 1007 00 and a 25 pin female connector Tektronix P N 131 0971 00 as illustrated in Figure 3 10 3 18 1780R Series Operator s Manual Operating Instructions 9 Pin Male Connector 25 Pin Female Connector RS232D Receive Figure 3 10 Serial Interface Connector Wiring Converter Serial Remote Information 1780R Series instrument configurations can be stored at and retrieved from a remote location To accomplish this the 1780R Se ries is connected to a host computer through a serial port that supports RS 232 or RS 422 standards All front panel controls operate in their usual manner during remote operation so remote selections may be changed with the front panel controls Front panel LED indicators light to show the current selection Commands to the 1780R Series and its responses are listed in Tables 3 3 and 3 4 1780R Series Operator s Manual 3 19 Operating Instructions Table 3 3 Serial Rem
61. bration Information READOUT INTENSITY TRACE ROTATION and GAIN CAL GAIN 1 CAL GAIN 2 CAL for NTSC software versions 1 11 amp Up will be circled when selected to indicate large knob assignment The oscillator signal is selected by touching the CAL OSC gt area of the screen until ON is outlined It automatically reverts to OFF when the Calibration menu is exited and must be reselected if desired when the menu is reentered Vectorscope Calibration Procedure for Software Versions 1 11 amp Up 1 Push the front panel CALIBRATE button to enter the Calibration menu If Password operation is enabled enter the password now Waveform calibration will be displayed 2 Push the button under the left CRT LED will light to select Vectorscope calibration shown in Figures 3 21 3 22 and 3 23 3 READOUT INTENSITY gt will be circled and a test readout will be displayed Use the large knob to adjust Readout intensity Only Readout intensity is adjusted through the menu signal intensity is adjusted with the front panel INTENSITY control 4 Touch TRACE ROTATIONS to obtain a test axis then use the large knob to adjust trace rotation 5 To adjust Vectorscope Gain touch CAL OSC gt until ON is outlined While the cal oscillator is on the V axis switcher is enabled and 75 bars are selected with 7 5 setup for NTSC a For 1780R NTSC touch GAIN 1 CAL and use the large knob to make the circle match t
62. capture the display right CRT only touch NOISE REDUCTION so that ON is outlined then touch FREEZE FREEZE will be outlined The captured display remains on the screen even if the input signal is removed The display is lost when the DIFF PHASE menu is exited by any method including touching GO TO DIFF GAIN pushing any of the four front panel menu buttons pushing the front panel LINE SELECT button to enter Line Select mode changing the selected line if already in Line Select mode or turning instrument power off To exit Freeze mode touch FREEZE again DIFF PHASE Measurement Information The 1780R Series provides two methods of making differential phase measurements single and double trace The single trace method of differential phase measurement resembles the single trace differential phase mode on the 520A Se ries This method requires the operator to normalize the gains but those settings will be stored and recalled at next entry to DIFF PHASE mode The amount of distortion is read from the graticule scale The double trace method of differential phase measurement resembles the double trace differential phase in the R520A Series This method requires the operator to null the space between the ends and individual steps of the two traces This provides greater accuracy than the single trace method and gives an on screen readout of the distortion measurement Single Trace DIFF PHASE Measurement Proced
63. ce method is available for simultaneous differen tial phase and gain measurements A two line display is used to display the two measurements simultaneously on one CRT waveform monitor with single trace diff phase on the left portion of the CRT and single trace diff gain on the right portion of the CRT The single trace method of differential phase and gain measurement resembles differential phase on the TEKTRONIX R520A Series This method requires the operator to normalize the gains but those 4 14 1780R Series Operator s Manual Measurements settings will be stored and recalled at next entry to DP amp DG mode The amount of distortion is read from the graticule scale DIFF PHASE amp DIFF GAIN Measurement Procedure 1 Apply a staircase signal or a ramp signal with subcarrier to the 1780R Series Touch lt DP amp DG gt Use the vectorscope variable gain control to set the amplitude of the chroma to be measured to the edge of the compass rose Use the large knob to set the phase of the chroma to be measured to the nine o clock position on the vectorscope display Use the Waveform Vertical Position control to place the beginning of the trace on a convenient graticule reference line Using the two line display differential phase and gain are displayed simultaneously on the left and right portions of the waveform monitor CRT If necessary adjust the vectorscope Variable Gain to vertically align the two displa
64. ction Factor 5 dP deflects the trace 50IRE Waveformggin X1 Var NTSC or 500 mV PAL 5 gain off Vector gain ad justed to place chrorra at compass rose Residual dP 10 90 APL Calibrated dP CRT readout Resolution Accuracy 0 1 over any 10 0 1 over full 360 Ext Ref 0 2 burst lock Range 1780R Series Operator s Manual 5 11 Specifications Table 5 5 Waveform Monitor DG and DP Display Cont Characteristics Recursive Filter Noise Reduction Cross Lurrinance Rejection Unit Sarrple Resporse 5 12 Performance Requirements Supplemental Information 115 cB signal to noise reduction with filter se lected Assurres white noise source 30 cB with filter selected O cB in dual dP dG mode Settles to within 1 GB in lt 50 lines with a step in APL Settles to within 1 dB in lt 50 frarres in line select 500 kHz 1100 kHz base band 1780R Series Operator s Manual Specifications Table 5 6 Synchronization Supplemental Characteristics Information Sync Input Intemal Ref Sync 0 2 to 2 0 V peak to peak Composite video applied to Separator conposite video Inputs A B1 B2 or B3 or probe Int Sync 0 5 to 2 0 V peak to peak Separator composite video Black Burst signal of 0 2 to Extemal Black Burst 14 cB to 46 cB 5 tines arrplitude applied to EXT SYNC input Composite Sync 0 2 to 8 0 V peak to peak Corrposite sync applied to EXT S
65. ctors Controls Indicators tion or variable sweep is selected the cursor interval is magnified correspondingly To change the large knob assignment from one cursor to another touch the quadrant labeled CURSOR 1 CURSOR 2 The current assignment is outlined by a box Timing cursors are not valid in Field mode For software versions 1 13 and up installed in instruments SN B020100 and up Refer to 11 LINE SELECT for information on Timing Cursors in Line Select mode NOTE Detailed Timing and Voltage Cursor information is located in Section 3 10 VOLTAGE CURSORS This switch enables the voltage cursors 11 The Voltage Cursor menu on the vectorscope CRT provides a choice of cursors that track together or are positioned separately and a choice between absolute and relative readout Cursor One appears as a dashed horizontal line and Cursor Two as a series of two short dashes on the waveform monitor display If vertical gain is employed the cursor interval is magnified accordingly To change the large knob assignment from one cursor to another touch the quadrant labeled CURSOR 1 CURSOR 2 gt Current assignment is outlined by a box LINE SELECT This switch enables the line select function which is available for both waveform and vectorscope For waveform display the selected line is displayed first in a multiple line display and brightened in a field display Alpha numeric readout indicates the selected li
66. dicated by the LED A Held mode will be exited when its companion switch is pushed and then the HELD switch is momentarily pushed again The switch setting will revert to the last selection before the Held mode was entered Pushing first one companion switch and then another will cause the display to alternate between the first switch selection and the second switch selection NOTE Some switches may be locked out by menu selections Companion Switch Example VECT SCH and XY PIX are used to select vectorscope CRT displays Push and release the VECT SCH switch to select Vector It will require one or two pushes Now push and release the XY PIX switch to select XY Push the VECT SCH switch Note that it is restored to Vector Push the XY PIX switch Note that it is restored to X Y Push the XY PIX switch a second time Now it toggles to PIX Push the VECT SCH switch twice Now it toggles to SCH 1780R Series Operator s Manual 2 9 Connectors Controls Indicators EH PARADE E BH OVERLAY iH WFM CAL cd GAIN 83 MAGNIFIER HoN gt ON 000 Figure 2 2 Right side of front panel 210 1780R Series Operator s Manual Connectors Controls Indicators NOTE The following switch groups are companion switches VECT SCH amp XY PIX PARADE OVERLAY amp WAVEFORM WFM CAL Refer to the preceding instructions entitled Companion Switch Example Locations of the switches are
67. dicates the voltage difference between the two cursors The mV IRE selection is made through page 2 of the Configure menu The Configure menu instructions appear later in this section REFERENCE SET has no effect in Absolute mode When RELATIVE is selected the readout is shown in percent and dB relative to the value when REFERENCE SET was last pushed REFERENCE SET resets the relative value to 100 096 0 dB If vertical gain is employed the cursor interval is magnified correspondingly Voltage difference between Cursor One and Cursor Two can be determined even though they may not both be on screen at the same time 3 2 1780R Series Operator s Manual Operating Instructions For software versions 1 13 and up installed in instruments SN B020100 and up Voltage cursors are automatically enabled when in Line Select with Timing Cursors Line Select This switch enables the line select function which is available for both waveform and vectorscope For waveform display the selected line is displayed first in a multiple line display and brightened in a field display Alpha numeric readout indicates the selected line and field on both CRTs In software versions 1 11 and up a 1 of 8 Field reference is provided for use with ghost cancelling signals In NTSC the 8 Field reference is built from two groups of 4 Fields Touching ALT FIELD will toggle between the two groups as a starting point for the 8 Field reference When
68. ds can be used 1 Adjust the waveform monitor controls for a high resolution display of sync 2 Adjust the large knob until one of the bright up dots is at the 5096 point of the leading edge of sync on the waveform display 3 Push the front panel REFERENCE SET button The phase readout is now 0 00 4 Adjust the large knob until the dots are on the zero crossing or 50 point of burst on the waveform display 5 The vectorscope CRT readout now gives SCH phase error in degrees Voltage Cursors in Fasc Time Marks Mode While in Time Marks mode push the front panel VOLTAGE CURSOR button A voltage cursor menu appears on the right side of the vectorscope CRT Touch ABSOLUTE RELATIVE or SEPARATE TRACK to toggle between those voltage cursor functions Refer to the section on Voltage Cursors in Section 3 of this manual for more details Verifying Burst Position The Fsc time marks display can be used to verify that burst is located 19 subcarrier cycles from the 5046 point of the leading edge of sync Position one of the dots on the 50 point of sync and count the number of dots between that dot and the dot on the zero crossing of the first full cycle of burst 1780R Series Operator s Manual 4 37 Measurements Other Measurements The 1780R Series instruments are capable of other measurements not described in this manual such as Group Delay and Chrominance Non Linear Phase and Gain These measurements and ot
69. e Horizontal positions vertical positions and gain settings defined while in Chroma Luma mode will be stored and reinstated when this mode is selected again Cursors in Chroma Luma Ensure that lt C Y gt is selected The cursors may be used to extract nomograph data from the 1780R Series instrument Five cursor settings must be entered by the operator using the waveform monitor CRT Readout in the upper right corner of CRT guides operator through the five settings which are described in the following procedure Making Chroma Luma Measurements Using Cursors 1 Select Pulse Width a Touch lt 12 5T gt lt 25T gt or OTHER for NTSC Touch lt 10 gt lt 20 gt or lt OTHER gt for PAL Chroma Luma gain error readings are not affected by pulse width 2 Set Pulse Amplitude a Adjust Horizontal Position and Magnification to place the modulated sine squared pulse on screen b Set Cursor 1 to the pulse top Set Cursor 2 to the baseline Touch ENTER 1780R Series Operator s Manual 4 23 Measurements Right CRT display CURSOR 1 PULSE TOP CURSOR 2 BASELINE TOUCH ENTER 10 0 us DIV CURSOR 1 25 T OTHER 1780R NTSC Selection 10 20 1781R PAL Selections THER Left CRT display RESTART Figure 4 7 Initial Chroma Luma Inequalities Measurement Screen 4 24 1780R Series Operator s Manual Measurements Table 4 6 Chroma Luma Front Panel Configuration V
70. e a front panel configuration at a preset location apply a low first to the Store line pin 11 and then to the desired preset Alternately the Store line and desired preset line may be forced low simultaneously Table 3 2 Remote Pin Functions m e nem 1 RGB Staircase Input iMQO input impedance to ground Requires 10 V staircase signal 2 RGB Enable Low RGB Enable Routes the signal on pin 1 to the Horizontal arrplifier where it is added to the rans fromthe Rarrp Generator In RGB rroce the Rarrp Generator reduces the ranp to 1 3 or 1 4 size selected by A2 585 4 Rerrote Sync Enable Low Rerrote Sync Enable INT EXT Reference tumed off and instrurrent sync provided by the signal on pin 10 Uu Low with Pin 11 High Recall Preset 2 Low with Pin 11 Low Store currert F P settings at Preset 2 location Low with Pin 11 High Recall Preset 3 Low with Pin 11 Low Store currert F P settings at Preset 3 location 7 Preset 1 Low with Pin 11 High Recall Preset 1 Low with Pin 11 Low Store currert F P settings at Preset 1 location 8 Preset4 Low with Pin 11 High Recall Preset 4 Low with Pin 11 Low Store currert F P settings at Preset 4 location 3 16 1780R Series Operator s Manual Operating Instructions Table 3 2 Remote Pin Functions Cont m wee nnm Ground 9 10 Remote Sync Input 5KQ input impedance to ground Polarity set by jumper A2 192 Factory
71. e only options currently available for the 1780R Series Part numbers are listed in Section 6 Standard Accessories The following accessories are shipped with the 1780R Series Part numbers are listed in Section 6 1 1780R Series Operator s Manual Cable Power Standard Opt Al A2 or A3 Filter Air 1 Graticule 511 1979 Visual 1780R ONLY 1 Graticule 511 1979 Photographic 1780R ONLY 1 Graticule K Factor Visual 1781R ONLY 1 Graticule K Factor Photographic 1781R ONLY 3 Graticule Lamp Incandescent 1 Replacement Cartridge Fuse 2 A Slow Blow 1780R Series Operator s Manual 1 9 Getting Started Optional Accessories The following is a list of the most common accessory items for the 1780R Series Part numbers if applicable are listed in Section 6 1780R Series Service Manual Viewing Hood Portable Cabinet Extender Kit for Oscillator and Z Axis Circuit Boards 1 10 1780R Series Operator s Manual END a eee Connectors Controls Indicators END EEE Connectors Controls Indicators This section provides an overview of control and connector functions To locate more detailed information please refer to the manual index or table of contents Switches Push and release the front panel switches to toggle between selections Push and hold to access outlined selections Companion Switches Some switch functions are paired or grouped so that two or three switches determine one display These ar
72. e referred to in this manual as companion switches Pushing the same companion switch twice in succession will change its selection as indicated by the LED Pushing first one companion switch and then another will cause the display to alternate between the first switch selection and the second switch selection Held functions will be forced to the top function of the switch For example VECT and SCH together reverts to VECT Controls All front panel controls are continuous except the Horizontal Position control which has stops It also has a spring return which returns it to the center position The further from center the control is turned the faster the display moves This is useful in MAG operation The five CRT controls Focus Scale Intens VPOS and HPOS are used to adjust both CRTs Refer to CRT Controls for details LEDs Green LEDs indicate front panel switch selections Some LEDs are located next to the function label and some are located in the switch itself Red LEDs indicate an uncalibrated gain condition 1780R Series Operator s Manual 2 1 Connectors Controls Indicators Audio Feedback Beep A Beep Sounds When The limit of a front panel control range has been reached An attempt is made to change a locked setting An attempt is made to access an invalid condition such as a Parade display in 1 line mode Disable the Beep Selecting Beep Off in the Configure menu will disable the beep for all
73. e signal amplitude sync tip to white bar locate the sync tip on the topmost of the two displays Use the large knob to vertically align the bottom of that sync tip with the white bar of the bottom display The CAL readout now displays sync tip to white bar amplitude X5 Gain can be used if desired 3 To measure burst amplitude locate the burst on the top display Use the large knob to vertically align the bottom of that burst with the top of the lower display s burst packet The CAL readout now displays burst amplitude 4 Any feature of the waveform can be measured in the same manner use the large knob to align the bottom of the desired feature with the top of the second appearance of that same feature This provides a readout of the voltage offset between the two displays Making Measurements Using VAR and REL This mode provides relative measurements in dB and percent An example of the readout is shown in Figure 3 14 calibrator signal not shown 1 Enter the WFM CAL mode Use the touch screen to select VAR and REL Select Two Line sweep and Flat filter Apply a color bar signal to the 1780R Series 1780R Series Operator s Manual 3 29 Operating Instructions Use the large knob to align a horizontal reference point usually the sync tip of one display with the white bar of the second display Push the REF SET button and obtain a CAL readout of 0 00 dB and 100 046 Relative burst amplitude is measured
74. ections PAL z available for SYSTEM M 1781R PAL BG ONLY Figure 3 24 Configure Menu Screen page 1 Table 3 6 Configure Menu Selections page 1 SYNC COUPLING FIELD TRIG FIXED CAL AMPL DC REST CLAMP PAL SYSTEM B G 1780R Series Operator s Manual Direct or Auto Frequency Controlled wimsync AC DC coupling or ground reference sets all four inputs The probe input is always AC coupled When GND is selected the words INPUTS GROUNDED are displayed on the CRT For two field sweep only selects whether field one or field two will be displayed on the left of the CRT Selects one of three fixed calibration arrplitucdes 700 mV 714 rV or 1000 rV Wim DC restorer darrps slow fast or off Waveformis darrped to sync tip or back porch tire PAL V and V lines overlaid appears as though only M were displayed sirrilar to NTSC display M The V lines are derrodulated 180 away fromthe AV lines Instrument operates in PAL systerrs B G or I ICPM rreasurerreris are nost affected O carrier reference level varies between systems Operating Instructions Left CRT display PRESET VECTGRAT i WEM GRAT MEASURE PHASE DISPLAY PROBE CONFIGURE CALIBRATE 50V DC MAX BAR f ABSUNITS 100 mv Cine i available for 1780R NTSC ONLY Figure 3 25 Configure Menu Screen page 2 Table 3 7 Configure Menu Selections page 2
75. enable the Measurement menu shown in Figure 4 1 Touch lt ICPM gt on the screen The instrument is now configured as specified in Table 4 4 Table 4 4 ICPM Front Panel Configuration VECTORSCOPE Selected by operator WAVEFORM Waveformmdisplay enabled other choices locked out INPUT Selected by operator REFERENCE Locked FILTER Low pass WFM SWEEPS Locked MAGNIFIER Autorratically set to X25 other choices may be selected by operator GAINS Calibrated gains WAVEFORM POSITION Horizontal and Vertical Position control settings selected by operator are saved and reinstated each tine the ICPM rode is enabled Exit ICPM Measurement Mode To exit ICPM mode push the MEASURE button again All instrument settings return to their previous state ICPM Measurement Information ICPM is measured by observing an XY display of quadrature output of a 1450 demodulator versus the video signal itself 1780R Series Operator s Manual 4 17 Measurements 4 18 The 1780R Series ICPM measurement method is similar to the Tektronix 1480 Series method Refer to the 1450 manual for details on configuring the demodulator for this measurement The external low pass filters Tektronix P N 015 0352 00 can be used to improve the display ICPM Measurement Procedure 1 Connect the Quadrature Out of the 1450 or TV1350 Demodulator to the 1780R Series EXT HORIZ Input and the Video Out to the selected 1780R Series input channel Push t
76. erential gain measurements The DP amp DG menu is displayed on the left CRT and the demodu lated sweep is displayed on the right CRT See Figure 4 4 The instrument is now configured as specified in Table 4 3 Exit DP amp DG Mode To exit DP amp DG mode push the MEASURE button again All instrument settings return to previous state Horizontal positions vertical positions and gain settings defined while in DP amp DG mode will be stored when exiting and reinstated when this mode is selected again DP amp DG Menu Selections Noise Reduction Touch NOISE REDUCTIONS to toggle between ON and OFF When noise reduction is off the demodulator output 500 KHz BW is directly displayed When noise reduction is on noise reduction of about 10 12 dB is accomplished without any reduction in bandwidth Freeze To capture the display right CRT only touch NOISE REDUCTION so that ON is outlined then touch FREEZE FREEZE will be outlined The captured display remains on the screen even if the input signal is removed The display is lost when the DP amp DG menu is exited by any method including pushing any of the four front panel menu buttons pushing the front panel LINE SELECT button to enter Line Select mode changing the selected line if already in Line Select mode or turning instrument power off To exit Freeze mode touch FREEZE again 1780R Series Operator s Manual Measurements R
77. es Controls xo en ELE EEDS 5 MuR te ae ah es Audio Feedback Beep A Beep Sounds When Disable the Beep A Click Occurs When Touch Screen crror eren terperi ank Front Panel Controls 1780R Series Operator s Manual Dr xi Ne ee ssl N See eee eee Ww N EL 1 4 2 1 2 1 2 1 2 1 2 2 2 2 2 2 2 2 2 3 Table of Contents DOWD oof eet aoa fase dam nd ane Rud ee dus CRY Controls 4 5 f REIR a RA CRUISER Precision Measurement Large Knob Menu Access Switches 0 0 00 eee eee eee Proben oops on RAs eerie Rana Mane aes ES Display Mode ere er Rer RR es R O RAR Seen em A Re nae Ras Wfm Horizontal llle Magnifier esee AD E ae dase nh RR tU a AES Gane UK ERO PERCORSO EC RSD Ics CeCe See OE One oe S ae n Uie e c ENTE Input zoe rr ca hare RU cR nta RAN aa Recta Rear Panel Connectors 0 0 Operating Instructions Large Knob And Associated Switches LL uuu Timing Cursors e peer RE ee Voltage Cursors eese E E E een Line Select ncs S vs re RULES Phase Shift oce eee DE E REM Eo SWICCheS 44 oer Ree Ue ase t xs Graticuless coe tees Mead eL tele ee eL Scale Illumination for Vector and Waveform Graticules Using The Vector Graticule 0004 Using The Waveform Graticule 0 Remote Operation oses t
78. es cien ra e eee REMOTE Connector scssi csa irana e e eee Remote Operation esses eese Serial Communications Interface 000005 Serial Interface Connector 0 0 Building a Wiring Converter 000 Serial Remote Information 0 0 00 0 0 eee SCH Display eR RA Soe ae eee Sh eS SCH Phase Measurement Procedure ii 1780R Series Operator s Manual Table of Contents Parade Operation ge bee ge 3 23 Two Line or Field Parade 0 0 0 ccc eee eee 3 23 Three Line Display eset Rees 3 23 Offset Menu akea a 0 0 ccc eect AR 3 23 DC Level Measurements 0 0 00 cee eee aes 3 24 DC Level Measurement Procedure s 3 25 Overlay Operation s ss scs egt Remb ees 3 26 Overlaid Displays 2 esas 3 26 Offset Men i ue ee RU ete LA IS UR De Re 3 26 WEBNISE CAM ee S edo S otio i ied a Gren UR TAPER UE UR Te 3 27 Enter WFM CAL Mode eeseeeeeee 3 27 General WFM CAL Information 3 27 Menu Information 20 0 0 0c ccc cece teenies 3 31 Menu Documentation Overview sss 3 31 Menu ACCESS oar E CLADE SCR U E P RELAIS AU UR RS 3 32 TOUCHE S CEGGHP 65 5 4 Ar A RR Acari Rasch astern Hie UR T S 3 32 Password Menu 0 0c cc ccc cee eee eens 3 34 Enable Disable the Password 0 00000 3 34 Define the Password 0 0 ccc eee eee nee 3 34 Change the P
79. f a differential mode wes enabled input is forced to CH A REFERENCE Status does not change FILTER Locked out VFM SWEEPS Set to One Line when DIFF PHASE is selected If lt SINGLE gt rode is selected any of the other sweeps can be selected using frontpane controls If lt DOUBLE gt is selected the instrument is set to One Line The Field Two Line and Three Line Sweeps are locked out GAINS Vectorscope and V aveformgains can be adjusted while in DIFF PHASE rrock the new settings will be saved when the Measurerrent menu is exited and reinstated when DIFF PHASE rrocde is again enabled WAVEFORM POSITION The Horizontal and Vertical Position controls can be VOLT TIME CURSOR adjusted while in DIFF PHASE mocs the new settings will be saved when the Measurement menu is exited and reinstated when DIFF PHASE node is again enabled The Vertical Position Control range is limited in order to keep the signal on screen Nct available in DIFF PHASE rrode Noise Reduction Touch NOISE REDUCTIONS to toggle between ON and OFF When noise reduction is off the demodulator output 500 KHz BW is directly displayed When noise reduction is on noise reduction of about 10 12 dB is accomplished without any reduction in bandwidth Noise reduction can be used in both lt SINGLE gt and DOUBLE modes 1780R Series Operator s Manual Measurements NOTE Freeze only available with Noise Reduction ON Freeze To
80. he MEASURE button to enable the Measurement menu For in service ICPM measurements LINE SELECT can be used to select the desired line zero reference pulse then modulated staircase signal For software versions 1 13 and up LINE SELECT can be used to select two lines for an overlaid display Push the front panel LINE SELECT button then touch the circle in the lower left portion of the vectorscope CRT to assign large knob function Select the line and field where the zero reference pulse is located To select the second line touch the circle in the lower left portion of the waveform touch screen and select the line and field where the modulated staircase signal is located Touch the ICPM error readout area of the waveform CRT to return the large knob assignment to the graticule then proceed to step 3 Turn intensity to maximum to locate the position of the trace off screen Use the 1780R Series Horizontal Position control to center the signal horizontally and the Vertical Position control to set the zero carrier reference point to the center of the electronic graticule plus mark See Figure 4 5 Turn down intensity for normal viewing If no ICPM is present on the carrier the display between blanking and zero carrier will line up on the vertical axis If ICPM is present the display will tilt Use the precision control large knob to adjust the electronic graticule until it just touches the portion of the signal with the greatest err
81. he compass rose Touch GAIN 2 CAL and again use the large knob to make the circle match the compass rose Touch GAIN 1 CAL 3 46 1780R Series Operator s Manual Operating Instructions anias ON Ww ALISN3LNI inoavay NOILVIOM ani3s T2 L NIVO Aejdsip 1H2 1uBiu uoneJqi e ado 540228A PUB u1J0JaAEM uaamjeag o Dbo3 0 SLu24epun suoj ng gsnd S3Aun2 S3XO8 Ni SHOI53A 35 V1d OL NIV5 1snfrav dNLIS HLIM SY 8 40100 333 WSL A dddV uon ejes nueu JYNDIHNOD WNI eui s3 eja1 saeq 96001 10 965 3nopeay Aejdsip 1H2 391 Display for 1780R NTSC lon 1 11 amp Up with CAL OSC Off Vectorscope Cal versions Figure 3 21 software 3 47 1780R Series Operator s Manual Operating Instructions dni3s ON ALISNALNI inoovayg NOILVLOU an13s Aeidsip 182 1414 uaaM3aq ejDbo 0 SLu24opun SUONNG qsnd uonesgye gt ado s10128A pue uJoJaAeM 1V9 Z NIVO 1SnfQV N3HL 3124D NO 32V31 135 OL NIVD 15h rav Aejdsip 182 437 Display for 1780R NTSC Vectorscope Cal software versions 1 11 amp Up with CAL OSC On lon Figure 3 22 1780R Series Operator s Manual Operating Instructions For 1781R PAL touch GAIN CAL and use the large knob to make the circle match the compass rose b Touch CAL OSC gt until OFF is outlined 6 To check the Vectorscope Gain adjustment push the front panel CALIBRATE button to enter the Calibr
82. hers are covered in the book Television Measurements available through Tektronix Customer Support 4 38 1780R Series Operator s Manual Specifications Exe Specifications Table 5 1 Input Output Supplemental Characteristics Information Vertical Ranges Volts Full Scale LO Accuracy 1 0 V 0 007 V P to P Amplitude for Full Graticule LO volt 140 IRE Var lt 0 5 1 to 2 1 5 1 0 67 V to 2 0 V input signal can be nace full scale Input Gain Ratios AtoB 1 1 0 002 0 998 1 002 AUX VIDEO IN to A 1 5 dB 0 3 cB Input Input A to AUX VIDEO 1 1 0 005 0 995 1 005 OUT Input A to PIX MON 1 140 02 0 98 1 02 OUT Vertical Magnifier X5 Accuracy 0 2 V X0 007 V P to P Amplitude for O 2 volt 28 IRE Full Graticule Maxinum Input Signal AC Couple All Inputs 2 0V p to p 10 90 APL Aux Video Out and Pix Mon terminated 1 0 V p to p 10 90 APL DC Couple All Inputs 1 5 V DC peak AC 1780R Series Operator s Manual 5 1 Specifications Table 5 1 Input Output Cont Max volts fromLoop Through common terminal to chassis Performance Requirements 2V mrs at mains frequency Supplemental Information Rejection ratio of corrmron to chassis in floating ground mode 234 dB at mains frequency Max DC Output Voltage Aux Video Out 0 5 V into 750 Pix Mon Out tO 5v into 750 Line strobe no input signal Rerrote Cont
83. hift Adjust the large knob to properly align the burst and vectors on the graticule Push the front panel CALIBRATE button to enter the Calibration menu then push the button under the left CRT Touch GAIN CAL The large knob will now adjust vectorscope gain Use the large knob to set the color bar vectors to fall on the boxes Exit Calibrate menu 1780R Series Operator s Manual 3 51 Operating Instructions Configure Menu Changing Configurations Push the CONFIGURE button to enter the Configure menu All front panel controls remain operational during Configure menu operation The Configure menu is a three page menu shown in Figures 3 24 3 25 and 3 26 Page one of the menu is displayed first touch PAGE to toggle through pages Instrument configuration choices are displayed on the touch screen menu with selected settings outlined To change a setting touch the desired feature on the screen Example Touch BARS area to toggle between 75 and 100 color bars To store changes exit the Configure menu by pushing the front pan el CONFIGURE button or by pushing another menu button 3 52 1780R Series Operator s Manual Operating Instructions PRESET MEASURE CONFIGURE CALIBRATE Left CRT display FIXED CAL AMPL rae f i oo 714 1000 NTSC choices m 300 Zo 1000 PAL choices arent EE EEE HN E EL TE FIELD TRIG DC RESTORER FAST OFF Sel
84. ideo parameters Four video inputs may be individually displayed or selected in various combinations on the waveform monitor Vector presentations may be individually displayed overlaid for comparison or compared to an external reference A fifth video signal may be selected for individual display via the high impedance front panel probe input Internal video filters provide specialized measurements with dual or triple filter modes available for simultaneous display 1780R Series Operator s Manual Getting Started A selection of internal and external graticules and electronic cursors permit measurements specific to many studio and transmission system applications An external horizontal input facilitates ICPM measurements External staircase from a camera control unit may be selected remotely Slow sweep is standard on the 1780R Series New Capabilities A precision phase control with on screen digital phase readout allows precision phase angle measurements Differential display resolution is within 05 with an absolute accuracy of 0 1 around the full 360 vector range The Tektronix double trace differential phase measurement technique has been enhanced with a digital recursive vertical filter to permit accurate on screen readouts in the presence of noise The Fsc Time Marks feature NTSC ONLY allows the operator to verify the accuracy of SCH Phase measurements Voltage cursors or Timing cursors can be set to any
85. ift 2 7 3 5 Reference set 2 7 3 1 3 5 Time cursors 2 5 3 1 3 45 Voltage cursors 2 6 3 2 3 45 3 54 LINE FIELD switch 2 12 Line select 3 3 In diff gain 4 10 In diff phase 4 6 Timing cursors in 2 5 Line select 2 6 Line time distortion 3 13 Index Low pass filter 2 14 Luminance filter 2 14 Magnifier 2 12 Measurement menu Bowtie 4 33 Chrominance to luminance inequalities 4 23 Diff phase and diff gain 4 12 Differential gain 4 7 Differential phase 4 2 Fsc time marks 4 36 General measurement informa tion 2 8 3 56 4 1 Incidental Carrier Phase Modula tion ICPM 2 7 3 5 4 17 K Factor 4 20 Noise 4 16 R Y sweep 4 31 Short Time Distortion 4 28 Menu access 2 8 3 32 Menus Calibrate 2 8 3 42 Configure 2 8 3 52 Toggling between pages 3 52 General menu information 3 31 Measure 2 8 3 31 3 56 4 1 Preset 2 8 3 31 3 36 N Noise measurement 4 16 Noise reduction 4 4 4 7 4 12 Index 4 O OFF lt switch 2 13 Offsets overlay mode 3 26 Offsets parade mode 3 23 ON gt switch 2 12 ONE TWO THREE switch 2 12 Options 6 1 Oscillator 3 46 3 51 Overlaid 4 18 Overlay mode 2 11 3 26 P Parade mode 2 11 3 23 PARADE OVERLAY switch 2 11 Password 3 34 Change 3 35 Define 3 34 Enable disable 3 34 Incorrect 3 35 Phase display 180 360 3 54 Phase shift 2 5 3 5 Picture monitor output Bright u
86. ight CRT display DOUBLE REDUCTION FREEZE Figure 4 4 DP amp DG Measurement 1780R Series Operator s Manual 4 13 Measurements Table 4 3 DP amp DG Front Panel Configuration VECTORSCOPE Vector display enabled other choices locked out WAVEFORM Derrodulated sweep displayed all front panel choices locked out There is no LED to indicate demodulated sweep INPUT Status does not change AI differential modes locked out if a differential mode wes enabled input is forced to CH A REFERENCE Status does not change FILTER Locked out WFM SWEEPS Set to Two Line when DP amp DG is selected Field One Line and Two Line Sweeps are locked out GAINS Vectorscope and V aveformgains can be adjusted while in DP amp DG mods the new settings will be stored and recalled at next entry to DP amp DG rrode WAVEFORM POSITION The Horizontal and Vertical Position controls can be VOLT TIME CURSOR adjusted while in DP amp DG mode the new settings will be stored and recalled at next entry to DP amp DG mode The Vertical Position control range is lirrited to keep the signal on screen The Vertical Position control range is lirrited in order to keep the signal on screen Not available in DP amp DG rrode DP amp DG Measurement Information Single Trace DP amp DG While the 1780R Series provides two methods of making differential phase and differential gain measurements only the single tra
87. igure 3 3 The polar display permits measurements of hue in terms of the relative phase of the chrominance signal with respect to the color burst Relative amplitude of chrominance to burst is expressed in terms of the displacement from center radial dimension of amplitude towards the color point which corresponds to 75 or 100 amplitude for the color being measured 36 1780R Series Operator s Manual Operating Instructions Figure 3 3 1780R Vector Graticule The graticule includes four burst amplitude marks 7596 with setup 75 with no setup 100 with setup and 100 with no setup On the NTSC graticule each chrominance vector terminates in a system of graticule targets in the form of two boxes a small box inside a large box The dimensions of the large boxes represent 10 centered on the exact chrominance phase and 20 of chrominance amplitude centered around 100 of standard amplitude The dimensions of the smaller boxes represent 2 5 and 2 5 IRE The PAL Vector graticule is shown in Figure 3 4 On the PAL graticule each chrominance vector related to the V burst terminates in targets that are in the shape of two boxes a small box inside a large box The dimensions of the large box represent 10 centered on the exact chrominance phase and 20 of chrominance 1780R Series Operator s Manual 37 Operating Instructions amplitude centered around 10046 standard amplitude The dimen sions of the smaller in
88. ill cause the instrument to reenter the stored measurement mode R Y SWEEP in this example turning on both Preset and Measure LEDs Exit Preset Menu Use one of these two methods to exit the Preset menu 1 Exit by pushing the front panel PRESET menu button and the instrument returns to its previous settings 2 Exit by changing any right side front panel control and the instrument continues to operate at the selected preset settings allowing modifications by the operator When the preset has been exited in this manner the word lt RECOVER gt will be displayed at the bottom of the menu screen the next time the Preset menu is selected as shown in Figure 3 18 Touch RECOVER to return to previous instrument settings Presets 1 through 8 can also be accessed by ground closures through the rear panel REMOTE connector Recall Initial Settings Push PRESET button to enter Preset menu Touch INIT Instrument will be reset to the settings shown in Table 3 5 Table 3 5 Initial Settings Control Setting Setting LEFT DISPLAY Vector REFERENCE Int RIGHT DISPLAY Vim CW SYNC Ext FOCUS SCALE INTENS Mid range FILTER FLAT VECT WFM H amp V POS Approximate Center WFM SWEEPS 2H screen MAG Off INPUT CHA 75 GANS Calibrated Slow READOUTS On DIR GRATICULE Int FIX 1780R Series Operator s Manual Operating Instructions Table 3 5 Initial Settings Cont mum emm eme COUPLING
89. in the same manner as absolute see step 3 of the preceding procedure The CAL readout will display the burst amplitude in dB and of the total signal amplitude The relative amplitude of any portion of the signal can be measured in the same manner use the large knob to align the bottom of the desired feature with the top of the second appearance of that same feature The relative readouts are provided in dB and percent 96 of total signal amplitude Using HX The 1780R Series large knob has no effect in the lt FIX gt mode This mode is used to compare the amplitude of the incoming video signal to several internally calibrated amplitudes 1 Enter the WFM CAL mode Use the touch screen to select lt FIX gt Select 2 Line and Flat filter Apply a color bar signal to the 1780R Series For NTSC if an IRE readout is desired be sure that IRE is selected on page 1 of the Configure menu Select the calibrator signal amplitude on page 1 of the Calibrate menu Adjust the amplitude of the incoming video signal until the CAL readout reflects the exact amplitude selected in step 3 a When using the calibrator setting of 1000 mV 140 0 IRE the CAL readout should equal that value when the sync tip of one display is aligned with the white bar of the second display b When using the calibrator setting of 714 mV 100 0 IRE for NTSC or 700 mV for PAL the CAL readout should 1780R Series Operator s Manual Operating Instr
90. inus CH B2 and CH B1 minus CH B3 together Bowtie Instrument will be forced to 2 Line Parade operation 40 CH B1 CH B2 CH B3 In WFM mode push and release this switch to select the rear panel Channel B1 Channel B2 or Channel B3 input for display on both CRTs In Parade mode all three are forced on In Overlay it selects any two or all three input channels on Refer to Table 2 4 for an outline of possible switch settings Table 2 4 Possible CH B1 CH B2 CH B3 Switch Settings ONE LINE or FIELD Possible Switch Settings Toggles between 2 channels and all 3 channels on Waveform TWO LINE or FIELD Toggles to select any one channel Parade THREE LINE or FIELD CH B1 CH B2 and CH B3 on together Waveform THREE LINE or FIELD Push amp Hold Toggles to select any one channel 41 CH A PROBE This switch selects the rear panel Channel A input or the front panel Probe input for display on both CRTs Upon entering the Probe mode the following message appears PROBE 50V DC MAX 1780R Series Operator s Manual 2 15 Connectors Controls Indicators Rear Panel Connectors Connectors CH A CH B1 CH B2 CH B3 EXT REF and CW are high impedance bridging loop through inputs CH A CH B1 CH B2 and CH B3 have either a grounded or floating shield depending on the position of the grounding screw which is located between the BNC connectors 2 16 The following connector locations are
91. ird field polarity is the sarre as that of the first field Sweep Linearity 1 Line 5 Us Div 1 2 Line 10 Us Div 1 3 Line 15 Us Div 1 1 Field Sweep 0 5 Division 2 Field Sweep 0 5 Division 3Field Sweep 0 5 Division Slow Sweep 5 of full screen over the length of the sweep 5 3 1780R Series Operator s Manual Specifications Table 5 4 Waveform Monitor Horizontal Deflection System Cont Supplemental Characteristics Information Magnified Sweep Accuracy X5 1 Us Div Applies to the center 10 X20 0 25 Us Div divisions of the magnified X25 0 2 Us Div dray X50 0 1 Us Div X100 50 ns Div Magnified Sweep Linearity camo Emaan eoe divisions of ified TIS eS X20 0 25 Us Div divisions of the magnified X25 0 2 Us Div 1 minor division 299 Sey X50 0 1 Us Div 1 minor division 299 X100 50 ns Div 1 minor division 299 Variable Sweep Range gt 20 Expands sweep around center of sweep Slow Sweep Duration 4 to 12 seconds Front panel variable control Timing Cursor Accuracy Within 5 ns any delay within one line 64 Us Line Select Range Full Field Waveformnrronitor and select Field Selection SRD on A aa es A Even or Odd and All Fields nurreric identification 1780R Series Operator s Manual Specifications Table 5 4 Waveform Monitor Horizontal Deflection System Cont Characteristics RGB YRGB Staircase Input
92. l be stored when exiting and reinstated when this mode is selected again DIFF GAIN Menu Selections Noise Reduction Touch NOISE REDUCTIONS to toggle between ON and OFF When noise reduction is off the demodulator output 500 KHz BW is directly displayed When noise reduction is on noise reduction of about 10 12 dB is accomplished without any reduction in bandwidth 1780R Series Operator s Manual 47 Measurements Right CRT display Left CRT display WFM X1 GAIN 1 10 IRE NTSC 1 100 mV PAL REDUCTION FREEZE Figure 4 3 Differential Gain Measurement 4 8 1780R Series Operator s Manual Measurements Table 4 2 DIFF GAIN Front Panel Configuration VECTORSCOPE Vector display enabled other choices locked out WAVEFORM Derrodulated sweep displayed all front panel choices locked out There is no LED to indicate demodulated sweep INPUT Status does not change AI differential modes locked out if a differential mode wes enabled input is forced to CH A REFERENCE Status does not change FILTER WFM SWEEPS GAINS WAVEFORM POSITION VOLTAGE amp TIMING CURSORS Locked out Set to One Line when DIFF GAIN is selected If lt SINGLE gt trode is selected any of the other sweeps can be selected using front panel controls If DOUBLE gt is selected the instrurrent is set to One Line The Field Two Line and Three Line Sweeps are locked
93. large knob until the desired character is displayed The selections include A through Z 0 through 9 several punctuation marks international characters and a space Use the buttons to move to the next character to be changed Select up to 8 digits in this manner To return to the Preset menu without renaming the preset touch CANCEL To exit the menu without renaming the preset push the front panel PRESET button To store the new preset name and return to the Preset menu touch ACCEPT Up to 12 presets may be named When all desired presets have been renamed push the front panel PRESET button to exit the menu 1780R Series Operator s Manual Operating Instructions Character being changed is outlined KNOB LETTER lt gt BUTTONS LOCATION Current selection from available RESET 1 characters is outlined ABCDEFGHIJKLMNOPQRSTUVW k z0123456789 lt gt amp A INTERNATIONAL CHARACTERS ACCEPT CANCEL Figure 3 19 Name Menu Screen 1780R Series Operator s Manual 3 41 Operating Instructions Calibrate Menu General Calibration Menu Information The Calibrate menu is available for both vector and waveform and uses both CRTs Pushing the front panel CALIBRATE button provides access to the menu Several calibration features such as Readout Intensity can be selected using the touch screen menu The settings can then be modified refer to the following Waveform and
94. lluminated switches one under the left CRT and one under the right CRT When lt TIMEOUT gt ON is selected Configure menu described in Section 3 vectorscope assignment of CRT controls will revert to waveform assignment after 30 seconds of no knob activity The settings of the five CRT controls are saved and restored when toggling between waveform and vector assignments 2 Left switch This switch assigns the Focus Scale Intensity and Position controls to operate with the left vectorscope CRT 3 Right switch This switch assigns the Focus Scale Intensity and Position controls to operate with the right waveform monitor CRT 4 SCALE The Scale control adjusts the level of graticule illumination A beep indicates the limits of the control range 5 FOCUS The Focus control adjusts the beam for optimum definition A beep indicates the limits of the control range 6 INTENS The Intensity control adjusts display brightness A beep indicates the limits of the control range 1780R Series Operator s Manual 2 3 Connectors Controls Indicators Figure 2 1 Left side of front panel 1780R Series Operator s Manual Connectors Controls Indicators 7 VERT POS Use the Vertical Position control to move the display up and down A beep indicates the limits of the control range Positioning range is greater for waveform monitor than for vectorscope 8 HORIZ POS Use the Horizontal Position control to mo
95. m 3 43 V VAR MAX switch 2 14 VAR SLOW switch 2 13 VAR X5 switch 2 13 Variable gain 2 13 VECT SCH switch 2 11 Vector display PAL V 3 53 Vector graticule scale 3 6 Version 3 55 Vertical gain adjustment waveform 3 45 Vertical position control 2 5 Viewing hood optional accessory 6 2 Voltage cursors 2 6 3 2 Units mV IRE 3 54 Zero set 3 45 W Waveform graticule scale 3 12 WFM WFM CAL switch 2 12 WFM 4CAL mode 2 12 3 27 Index X X Y input 2 16 XY PIX switch 2 11 XY graticule scale 3 9 Index 6 Z Zero carrier ICPM 4 18 Zero set Calibrator amplitude 3 45 Phase shift reference set 2 7 Voltage cursors 3 45 1780R Series Operator s Manual
96. ment Procedure 1 Apply a staircase signal or a ramp signal with subcarrier to the 1780R Series Touch lt DOUBLE gt 3 Use the vectorscope variable gain control to set the amplitude of the chroma to be measured to the compass rose Locate the point of largest deviation between the two traces waveform CRT and use the large knob to bring the traces together at this point Push the REFERENCE SET front panel button Diff gain readout should be 0 0 Locate the point of largest deviation between the two traces and use the large knob to bring the traces together at this point Diff gain readout waveform CRT now gives the total amount of differential gain To measure the differential phase of each step in the signal repeat the process bringing each individual step together Using Line Select in DIFF GAIN 1 Push the front panel LINE SELECT button to enable Line Select mode Both the waveform monitor and vectorscope will be in Line Select and display the same line Line Select readout is provided on the waveform CRT Touch MENU to outline ON for Line Select menu display on the vectorscope CRT 1780R Series Operator s Manual 4 11 Measurements Simultaneous Diff Phase amp Diff Gain Measurements 4 12 Enter DP amp DG Mode Push the MEASURE button to enable the Measurement menu shown in Figure 4 1 Touch DP amp DG on the screen to enable simultaneous differential phase and diff
97. menu is displayed on the left CRT with demodulator output displayed on the right CRT as shown in Figure 4 2 The instrument is now configured as specified in Table 4 1 Large knob function is phase shift and PHASE SHIFT LED lights Exit DIFF PHASE Mode To exit DIFF PHASE mode push the MEASURE button again All instrument settings return to previous state To move from DIFF PHASE mode to DIFF GAIN touch the GO TO DIFF GAIN area of the screen Horizontal positions Vertical positions and gain settings defined while in DIFF PHASE mode will be stored when exiting and reinstated when this mode is selected again DIFF PHASE Menu Selections NOTE While operating in Line Select mode noise reduction operates only with full field test signals 4 2 1780R Series Operator s Manual Measurements Right CRT display Left CRT display SET VECTOR TO ORCE i SINGLE ra A Cancre 1 10 1RE NTSC 1 100 mV BAL vei uu ducere ae Lids cbe eR ccm REDUCTION re ee PE eS ey DIFF GAIN C QOREEPE Figure 4 2 Differential Phase Measurement 1780R Series Operator s Manual 4 3 Measurements Table 4 1 DIFF PHASE Front Panel Configuration VECTORSCOPE Vector display enabled other choices locked out WAVEFORM R Y sweep displayed all front panel choices locked out There is no LED to indicate R Y sweep INPUT Status does not change AI differential modes locked out i
98. mp Below 3 50 Figure 3 24 Configure Menu Screen page1 3 53 Figure 3 25 Configure Menu Screen page2 3 54 Figure 3 26 Configure Menu Screen page3 3 55 Figure 3 27 Measure Menu Screen s 3 56 Figure 4 1 Measure Menu Access lees 4 1 Figure 4 2 Differential Phase Measurement 4 3 Figure 4 3 Differential Gain Measurement 4 8 Figure 4 4 DP amp DG Measurement 4 13 Figure 4 5 Making ICPM Measurements 4 19 Figure 4 6 K Factor Electronic Graticule 421 Figure 4 7 Initial Chroma Luma Inequalities Measurement Screen ccc cece cece eeceeees 4 24 Figure 4 8 Setting Timing Cursors to Pulse Width 4 26 Figure 4 9 Short Time Distortion Electronic Graticule 4 29 Figure 4 10 Bowtie Measurement Screen 4 34 1780R Series Operator s Manual vii Table of Contents List of Tables viii Table 2 1 Possible Parade and Overlay Configurations 2 11 Table 2 2 Waveform Magnification 2 13 Table 2 3 Multiple Filter Displays 2 14 Table 2 4 Possible CH B1 CH B2 CH B3 Switch Settings 2 15 Table 3 1 Plug Jumpers for Vectorscope Board 3 10 Table 3 2 Remote Pin Functions esee 3 16 Table 3 3 Serial Remote Commands to the 1780R Series 3 20 Table 3 4 1780R Series Responses
99. mpares CH B1 with CH B2 and the right half compares CH B1 with CH B3 4 A broad null indicates unequal amplitudes between signals 1780R Series Operator s Manual 4 33 Measurements Right CRT display 2 0 usi DIV O time error marks CH B1 CH B2 CH B1 CH B3 Left CRT display Leasai inmhe a ea eha n a a keea a a ELE Figure 4 10 Bowtie Measurement Screen 4 34 1780R Series Operator s Manual Measurements Table 4 9 Bowtie Mode Front Panel Configuration VECTORSCOPE Selected by operator WAVEFORM Parade selected other choices locked INPUT B1 B2 amp B1 B3 selected other choices locked REFERENCE Status does not change FILTER Status does not change WFM SWEEPS Two Line selected other choices locked GAINS Gain setting selected by operator are saved and reinstated each tine the Bowtie rreasurerrert mode is enabled WAVEFORM POSITION Horizontal and Vertical Position control settings selected by operator are saved and reinstated each tine the Bowtie rreasurerrert mode is enabled TIMING CURSORS Tirring cursors are available 1780R Series Operator s Manual 4 35 Measurements Fac Time Marks Measurement Enter Fsc Time Marks Measurement Mode Push the MEASURE button to enable the Measurement menu shown in Figure 4 1 Touch FSC TIME MARKS on the screen The large knob function is assigned to phase shift The instrument is now configured as specified in Table 4 10 T
100. nder NSTA Test Procedure 1A B 2 Hurridity 90 to 95 Noncondensing Equiprrent Type Test and measurement Safety Class Class as defined in IEC 1010 1 Annex H grounded o ne ___e IIM Overvoltage Category Overvoltage Category II as defined in IEC 1010 1 Annex J Pollution Degree Pollution Degree 2 as defined in IEC 1010 1 Note rated for indoor use only 1780R Series Operator s Manual 5 21 Specifications Table 5 14 Certifications and compliances EC Declaration of Confomity EMC FCC Corrpliance Installation Overvoltage Category Meets intent of Directive 89 336 EEC for Electromagnetic Corrpatibility Corrpliance wes denonstrated to the following specifications as listed in the Official J oumal of the European Contmunities EN 50081 1 Enissions EN 55022 Class B Radiated and Conducted Errissions EN 50082 1 Intrunity IEC 801 2Electrostatic Discharge Irrrrunity IEC 801 3RF Electromagnetic Field Intrunity IEC 801 4 Electrical Fast Transient Burst Intrunity 1 High quality shielded cables must be used to ensure con piiance to the above listed standards This product complies when installed into any of the following Tektronix instrument enclosures 1700FOO Standard Cabinet 1700FC2 Portable Cabinet 1700F05 Rack Adapter Errissions corrply with FCC Code of Federal Regulations 47 Part 15 Subpart B Class A Lirrits Terminals on this product may have different installation Overvoltage category
101. ne and field on both CRTs Additional line select information can be found in Section 3 Full measurement functions are available in Line Select mode Large knob assignment is indicated by a circle and is selected by touching the line number area on the desired CRT screen 1780R Series Operator s Manual Connectors Controls Indicators Different lines can be displayed on the waveform and vector scope CRTs when that function is selected via the Line Select menu by touching lt WFM VECT gt until NO is outlined For software versions 1 13 and up installed in instruments SN B020100 and up For ease in viewing the Timing Cursors while in Line Select mode the Timing Cursor dots are positioned on the Voltage Cursors Upon entering Line Select mode with Timing Cursors on the Voltage Cursors are automatically enabled For software versions 1 13 and up A dual Line Select mode is available for making ICPM measurements when in Line Select It is described in Section 4 under CPM Measurement 12 PHASE SHIFT This switch enables the precision phase shift measurements Phase readout appears in the upper left corner of the vectorscope CRT This readout changes as the phase is shifted For SCH operation the phase ranges from 180 to 180 For Vector the configure menu offers a choice of two phase displays 180 to 180 or 0 to 360 13 REFERENCE SET This switch is used in Phase Shift Voltage Cursor and Line Select modes
102. ner target represent 3 and 5 of chromi nance amplitude Note that the chrominance vectors associated with the V burst are terminated in the smaller targets only Figure 3 4 1781R Vector Graticule On the NTSC graticule the small marks at intervals along the I and Q axes denote the amplitudes of the chrominance components On the PAL graticule the small marks at intervals along the U and V axes denote the amplitudes of the U and V chrominance components The horizontal and vertical axes of the vector graticule contain markings for checking Vector mode bandwidth A subcarrier frequency sine wave whose amplitude places it on the outer compass rose is used as a reference When the frequency is changed the diameter of the circle should reduce At a point equal to 70 of full 3 8 1780R Series Operator s Manual Operating Instructions 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 demodulator output amplifiers Differential Gain and Phase Measurements The 1780R Series provides differential gain and phase measurements through the Measurement menu accessed by pushing the front panel MEASURE button Instructions are given in Section 4 The 1780R Series vector graticule is the same as the 1720 Series vector graticule and provides differential gain and phase markings so that approximate 1780R Series measurements can also be made in
103. ntial gain measurement resembles differential gain on the 520A Series This method requires the operator to normalize the gains but those settings will be stored and recalled at next entry to DIFF GAIN mode The amount of distortion is read from the graticule scale The double trace method of differential gain measurement resembles double trace differential phase in both 1780R Series and R520A Se ries This method requires the operator to null the space between the ends and individual steps of the two traces This provides greater accuracy than the single trace method and gives an on screen readout of the distortion measurement Single Trace DIFF GAIN Measurement Procedure 1 Touch SINGLE 2 Apply a staircase signal or a ramp signal with subcarrier to the 1780R Series 3 Use the vectorscope variable gain control to set the amplitude of the chroma to be measured to the edge of the compass rose 4 Use the large knob to set the phase of the chroma to be measured to the nine o clock position See Figure 4 3 5 Use the Waveform Vertical Position control to place the beginning of the trace waveform CRT on a graticule reference mark 1780R Series Operator s Manual Measurements 6 Differential gain is the amount of signal that is above or below the graticule reference mark Read the amount directly off the graticule scale waveform CRT 1 major division 1 10 IRE NTSC or 100 mV PAL Double Trace DIFF GAIN Measure
104. o 9 Touch CAL SIGNAL ON OFF until ON is outlined CAL signal is not available in CAL AMP ZERO SET gt a 1780R Series Operator s Manual Select VERT CAL Use the large knob to adjust the vertical gain for a 1 V calibrator signal display on the waveform CRT Select TWO LINE sweep with VAR sweep off Push the front panel TIME button to turn on the timing cursors Reduce the display intensity if necessary to view the timing cursor dots Touch the CURSOR 1 CURSOR 2 area of the screen until CURSOR 1 is outlined Use the large knob to move Timing Cursor 1 approximately 1 major division in from the left edge of the graticule Select CURSOR 2 gt and use the large knob to move it 100 usec to the right of Timing Cursor 1 as indicated on the CRT readout Touch HORIZ CAL The large knob will now adjust sweep length time with respect to the graticule Adjust for 10 divisions between cursor dots Push the front panel TIME button to turn off the timing cursors Readjust the readout intensity if necessary Apply a 1 0 volt signal to the EXT HORIZ input Ensure that the signal is properly terminated in 75 Q Operating Instructions i Touch EXT HORIZ CAL The large knob will now adjust sweep length time with respect to the graticule Do not change the MAG setting automatically set to 100 mV div Adjust the large knob for a horizontal display of 10 divisions Vectorscope Cali
105. oduct Support Service Support For other information To write us Website 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 QGtek 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 Table of Contents General Safety Summary Getting Started Documentation Overview Operator s Manual Service Manual Documentation Conventions Who Should Use This Operator s Manual 1780R Series Product Overview New Capabilities Touch Screen 000005 1780R Series Package Mechanical Installation Rack Mounting 4 Options iere rr ERR IR Standard Accessories Optional Accessories Connectors Controls Indicators Switches cub tee elke a Companion Switch
106. ollowing switch groups are companion switches AUX DIFF LPASS amp FLAT LUM CHROM Refer to the preceding instructions entitled Companion Switch Example 37 AUX DIFF LPASS Push and release this switch to toggle through the following selections Aux Video In signal is input after the video filters Differentiated step linearity steps are translated into spikes for amplitude comparisons and Low pass filter 300 kHz bandwidth 38 FLAT LUM CHROM Push and release this switch to toggle through the following selections Flat unfiltered video signal Luminance chrominance filtered out and Chrominance luminance filtered out Push and hold to select a multiple filter display described in Table 2 3 Table 2 3 Multiple Filter Displays Possible Switch Settings ONE LINE or FIELD Flat Lum overlay Flat filtered displayed first left portion of screen then luminance filtered TWO LINE or FIELD Flat filtered displayed first followed by lurrinance filtered and chrorrinarce filtered THREE LINE or FIELD 2 14 1780R Series Operator s Manual Connectors Controls Indicators NOTE The three INPUT switches are companion switches Refer to the preceding Companion Switch Example Input 39 A B1 B1 B2 B1 B3 This switch selects from the following inputs for display CH A minus CH B1 CH B1 minus CH B2 or CH B1 minus CH B3 Push and hold this switch to select CH B1 m
107. or Adjust the Magnification factor as needed to best view the error 1780R Series Operator s Manual Measurements 5 The 1780R Series on screen readout shows the ICPM phase error in degrees Set zero carrier reference to graticule plus mark ZERO CARRIER PRESET MEASURE CONFIGURE Figure 4 5 Making ICPM Measurements 1780R Series Operator s Manual Set electronic graticule to greatest error 4 19 Measurements K Factor Measurement Enter K Factor Mode Push the MEASURE button to enable the Measurement menu shown in Figure 4 1 Touch K FACTOR on the screen K FACTOR is displayed on the left CRT The input signal and electronic graticule are displayed on the right CRT The instrument is now configured as specified in Table 4 5 Making K Factor Measurements 1 Use the Horizontal Position and the Waveform Var Gain as needed to position the signal baseline on the dotted electronic graticule line and position the top of the pulse at the center of the electronic graticule plus sign See Figure 4 6 2 Use the large knob to adjust the electronic K Factor graticule outline to just touch the point of greatest signal error a Use X5 Gain as needed to view the signal To ensure a calibrated graticule if the Var Gain was employed while in X1 Gain it must remain on while in X5 Gain 3 Read the Kor Factor error in percent on the CRT readout 4 20 1780R Series Operat
108. or s Manual Measurements Right CRT display 20 usiDIV Pulse top set Fu to plus mark and baseline set to dotted Tuus Graticule set to point of greatest signal error Left CRT display K FACTOR Figure 4 6 K Factor Electronic Graticule 1780R Series Operator s Manual 421 Measurements Table 4 5 K Factor Front Panel Configuration VECTORSCOPE Selected by operator WAVEFORM Waveformdisplay enabled choices locked out INPUT Selected by operator REFERENCE Status does not change FILTER Status does not change VFM SWEEPS One Line sweep selected other choices may be selected by operator GAINS VAR Wavefomngain selected WAVEFORM POSITION Horizontal and Vertical Position control settings selected by VOLTAGE amp TIMING CURSORS operator are saved and reinstated each tine the ICPM rode is enabled Both voltage and tirring cursors are available in K Factor rreasurerrert rrode 1780R Series Operator s Manual Measurements Chroma Luma Inequalities Measurement Enter Chroma Luma Mode Push the MEASURE button to enable the Measurement menu shown in Figure 4 1 Touch CHROMA LUMA on the screen Vectorscope and waveform displays are enabled and the instrument is now configured as shown in Figure 4 7 and Table 4 6 Exit Chroma Luma Mode To exit Chroma Luma mode push the MEASURE button again All instrument settings return to their previous stat
109. or with no triggering signal 5 14 1780R Series Operator s Manual Specifications Table 5 6 Synchronization Cont Supplemental Characteristics Information Rerrote Sync Anplitude 2 0 to 5 0 V square wawe or Input enabled through 4 0 V composite sync rear panel REMOTE con nector Input Inqpedance iMQ Frequency 30 60 Hz NTSC 25 50 Hz PAL square wave vll synchronize a 2 field sweep Rerrote sync by passes the sync stripper and field ID circuits Table 5 7 Vectorscope Vector Display Supplemental Characteristics Information Phase Control Digital Phase Shifter Phase Accuracy toi Extemal CW signal 0 25 Burst Lock Resolution 0 05 Chrominance Bandwidth Foc Subcarrier Frequency Upper 3 dB Point Fac 4500 kHz 100 kHz NTSC 3 579545 MHz Lower 3 Point FSC 500 kHz 100 kHz PACS a a Chrorrinance Transient Modulated Sin pulse in Response R Y Mode 1780R Series Operator s Manual 5 15 Specifications Table 5 7 Vectorscope Vector Display Cont Performance Supplemental Characteristics Requirements Information Display Vector Phase 125 Measured with color bar Accuracy signal Vector Gain Accuracy 2 5 1 25 IRE Quadrature Phasing 0 5 Subcarnier Regenerator Pull In Range PAL instrurrents are tested to 10 Hz but typically lock NTSC 50 Hz Of Fec MP SEN to within 50 Hz PAL 10 Hz Of Fec Pul In Tine Within 1 second with sub car
110. ote Commands to the 1780R Series Command Function Results HJ or Ha UPLOAD 1780R Series sends a streamof data representing the current instrument configuration to the host computer D or Hd DOWNLOAD 1780R Series expects a streamof cata representing an instrurrent configuration of the sane formthat wes uploaded P or 4p PARTIAL 1780R Series expects a streamof cata representing DOWNLOAD an instrurrent configuration with the knob settings focus intensity etc not affected The character indicates a remote control command The 1780R Series ignores all transmissions until this character is received Table 3 4 1780R Series Responses Command Description The transmission wes successful ACK Conmand nct known The character was received but was not followed bya U u D d P orp Bad data received all expected data consists of ASCII printable characters Bad intemal checksum Bad transmission checksum NACK Tirred out the process took too long to conplete JA Izi r Software version number mismatch Serial data format 8 data bits 1 stop bit no parity Baud rates supported are 300 1200 9600 19200 The baud rate selection is made through page 3 of the Configure menu with further instructions later in this section 1780R Series Operator s Manual Operating Instructions The data stream transmitted to and from the host representing the current 1780R Series se
111. out Vectorscope and Vaaveformgains can be adjusted while in DIFF GAIN noc the new settings will be saved when the Measurerrent menu is exited and reinstated when DIFF GAIN rroce is again enabled The Horizontal and Vertical Position controls can be adjusted while in DIFF GAIN mode the new settings will be saved when the Measurement menu is exited and reinstated when DIFF GAIN mode is again enabled The Vertical Position Control range is limited in order to keep the signal on screen Not available in DIFF GAIN rrode Noise reduction can be used in both lt SINGLE gt and lt DOUBLE gt modes NOTE Freeze available only with Noise Reduction ON Freeze To capture the display right CRT only touch lt NOISE REDUCTION ON then touch FREEZE 1780R Series Operator s Manual Measurements 4 10 The captured display remains on the screen even if the input signal is removed The display is lost when the DIFF GAIN menu is exited by any method including touching GO TO DIFF PHASE pushing any of the four front panel menu buttons pushing the front panel LINE SELECT button to enter Line Select mode changing the selected line if already in Line Select mode or turning instrument power off To exit Freeze mode touch FREEZE again DIFF GAIN Measurement Information The 1780R Series provides two methods of making differential gain measurements single and double trace The single trace method of differe
112. p pulse 2 16 Front panel switch 2 11 Rear panel connector 2 16 Power cord options 6 2 Power switch 2 3 Precision measurement control large knob 2 5 Preset menu 2 8 3 36 Recall 3 15 3 36 Recover 3 38 Rename 3 40 Store 3 39 Probe 2 9 Probe X1 X10 3 54 Push and hold switches 2 1 1780R Series Operator s Manual Index R Readout ON OFF 3 55 Readout intensity adjustment vectorscope 3 46 Readout intensity adjustment waveform 3 43 Rear panel connectors 2 16 Recall a preset 3 36 Recall initial settings 3 37 Recover function 3 37 Reference switch INT EXT CW 2 12 Remote connector 2 18 3 15 Remote control 3 15 Rename a preset 3 40 RS232 3 18 RS422 3 18 RY sweep measurement 4 31 S Scale illumination adjustment 2 3 3 6 Scale illumination control 2 3 3 6 SCH phase measurement 3 22 Serial communications 3 18 Serial port 2 18 3 18 Serial Remote Information 3 19 Service Extender board kit 6 2 Setup YES NO 3 54 Short Time Distortion measure ment SD 4 28 Slow sweep trigger 3 55 Software version displayed 3 55 Sweep rate control 2 13 Sync AFC or direct 3 53 System B G or I 3 53 1780R Series Operator s Manual T Time cursors 2 5 3 1 In line select 2 6 Set interval 3 45 Touch screen 2 2 3 32 Quadrants 3 32 Trace rotation adjustment vector scope 3 46 Trace rotation adjustment wavefor
113. point providing accurate on screen measurement readouts and are fully operational and accurate at all Gain and Magnifier settings In addition to the standard remote interface provided on 1700 Series products the 1780R Series provides a serial remote interface compatible with RS232 and RS422 standards Touch Screen The 1780R Series has four main menu modes that provide on screen measurement and calibration selections Through the Preset menu the operator can define name save and recall up to 12 front panel setups Many instrument settings can be easily changed through the 1780R Series touch screen menus For example the Configure menu allows the choice of internal or external graticule illumination and the Calibrate menu allows trace rotation and readout intensity adjustments The Measurement menu provides entry into specific measurement modes 1780R Series Operator s Manual 1 3 Getting Started 1780R Series Package The 1780R Series is supplied as a single 5 1 4 inch high package ready for rack mounting A portable cabinet is available providing handle feet and front and rear covers The instrument is equipped with a high reliability cooling fan so that no clearance is required above or below the 1780R Series Mechanical Installation All qualification testing for the 1780R Series was performed with the rack mount cabinet installed To guarantee compliance with specifications the instrument should be operated in
114. pun suoj nq qsnd ALISN3LNI 1noavau NOLVIOM Ke dsip 1H2 14614 ejdsip 1H2 391 Figure 3 23 Vectorscope Calibration Menu Display for 1781R PAL all software versions and for 1780R NTSC software versions 1 10 amp Below 1780R Series Operator s Manual Operating Instructions 3 READOUT INTENSITY gt will be circled and a test readout will be displayed Use the large knob to adjust intensity The front panel INTENSITY control adjusts signal intensity only Readout intensity must be adjusted through the Calibration menu 4 Touch TRACE ROTATION to obtain a test axis then use the large knob to adjust trace rotation 5 Touch CAL OSC gt until ON is outlined While the cal oscillator is on the V axis switcher is enabled and 75 bars are selected with setup for NTSC a b Touch GAIN CAL The large knob will now adjust vectorscope gain Use the large knob to make the circle match the compass rose Exit Calibrate menu Perform Step 6 for 1780R NTSC only 6 Apply a 75 color bar signal with no setup to a 1780R input channel and select that channel for display a Push the front panel CONFIGURE button to enter the Configure menu Touch the PAGE area of the screen until 2 is outlined Touch SETUP until NO is outlined Touch BARS until 75946 is outlined Push the front panel PHASE button to assign the large knob function to phase s
115. rd operation place button 2 of S385 MPU board in the closed position Turn the instrument power to standby and back to on for the microprocessor to recognize the new switch setting Disable in the same manner placing button 2 in the open position Define the Password The first time a restricted access menu is selected after the jumper has been moved the words lt DEFINE PASSWORD gt are displayed on screen Select the three digit password by touching the desired sequence of numbers on the CRT screen choose from the displayed numbers 1 3 34 1780R Series Operator s Manual Operating Instructions 2 3 and 4 That password is then stored and remains in memory even when the instrument power is turned to standby and back to on Change the Password Move button 2 of S385 MPU board to the open position to disable password operation Apply power to the instrument Follow preceding instructions to Enable the Password and Define the Password Use the Password Once password is enabled it restricts access to the Preset and Calibrate menus and the Password menu shown in Figure 3 17 is displayed To access Name Store or Calibrate menu functions touch the numbers on the screen in proper sequence to form the password Once Name Store or Calibrate are selected entering the correct password will provide access to the desired menu Incorrect Password Entering an incorrect password produces a momentary displ
116. readout to 0 00 in Voltage Cursor mode with lt RELATIVES selected to store the displayed voltage as a reference and reset the readout to 100 and in Line Select mode to access the vertical interval line 19 1780R Series Operator s Manual 3 5 Operating Instructions Knob The Precision Measurement control large knob provides analog precision adjustments associated with the REFERENCE SET LINE SELECT PHASE TIMING CURSOR and VOLTAGE CURSOR switches or as assigned by menu selections The current function of this knob is circled on the CRT screen lt gt Switches The switches provide single step increments The readout increments are the same as those for the Precision Measurement Control readout Push and release for an individual increment or push and hold to continue increments Graticules This section describes the basic vector and waveform graticule markings for both the 1780R NTSC and 1781R PAL instruments Scale Illumination for Vector and Waveform Graticules The choice of internal or external graticule illumination is provided on page 2 of the Configure menu Refer to the Configure menu instructions in this section To adjust scale illumination push the button under the vectorscope or waveform CRT to assign CRT controls to vectorscope or waveform then adjust the SCALE control as desired Using The Vector Graticule Basic Vector Graticule Markings The NTSC Vector graticule is shown in F
117. rier frequency within 50 Hz 10 Hz for PAL instrurrents of Foc Phase Shift with Subcanier Frequency Change NTSC 0 5 fromF ec to Fac 450 Hz or Fac to Fse 50 Hz PAL 0 5 fromFsc to Fac 10 Hz or Fac to Fac 10 Hz Phase Shift with Burst 2 fromnorrinal burst ampli Intemal or External burst Amplitude Change tude to 3 cB reference Phase Shift with Input Channel Change Phase Control Range 5 16 c2 With EXT REF selected Channel A to CH B Channels B1 B2 B3 to one another 360 continuous rotation 1780R Series Operator s Manual Specifications Table 5 7 Vectorscope Vector Display Cont Supplemental Characteristics Information Vector Display Differential Phase Differential Gain X196 Measured with 140 IRE 1 V linearity signal with 40 IRE 300 nv of subcarrier Position Control Range wma peme Vertical 24 6mm fromcenter Clarrp Stability yea 0 4 rrr or less Center Spot rroverrent with Rotation of PHASE control Variable GAIN Range 14 CB to 6 dB of 75 color Untenvinated color bar bar preset gain signal can be brought to appropriate targets Burst froma tiple tenvinated signal can be moved to the compass rose Max Gain 2x5 Variable GAIN Phase t1 as gain is varied from Shift 43 cB to 6 cB 1780R Series Operator s Manual 517 Specifications Table 5 8 Vectorscope XY Display Characteristics Input Amplit
118. rol Interface Standard RS232 RS422 Control Enable Ground Closures and Pre Sets Table 5 2 Waveform Monitor Vertical System Performance Supplemental Characteristics Requirements Information Retum Loss CHA B1 B2 or B3 240 cB DC to 5 MHz Tenvinated in 75 Aux Video In Aux gt 34 dB DC to 5 MHz Instrument On only Video Out amp Pix Mon Out Ext Sync Input gt 46 dB to 5 MHz Loop Through Isolation 780 cB at Foc between channels and between each channel and EXT REF Measured externally 1780R Series Operator s Manual Specifications Table 5 2 Waveform Monitor Vertical System Cont Characteristics Crosstalk Frequency Response Flat X1 50 kHz 5 MHz Input Ch A B1 B2 amp B3 AUX IN AUX OUT 5 MHz 10 MHz Input Ch A Input Ch B1 B2 and B3 AUX IN AUX OUT Supplemental Information Typically 70 cB isolation between channels Mea sured at Foc between channels and each channel and EXT REF 1 Volt Ful Scale Variable Gain off Adjusted for rrini mal Lurrinance Chrorri nance gain error Typically lt O0 5 1 Volt Full Scale Variable Gain off 10 MHz 15 MHz Input ChA B1 4296 5 B2 amp B3 1 Volt Full Scale Variable Gain off 15 MHz 20 MHz Input Ch A B1 1 Volt Full Scale Variable Gain off 3 dB at gt 20 MHz B2 amp B3 LunyChroma Gain X5 Gain Modulated Sir Pulse 12 5T NTSC 10T PAL Voltage Cursor
119. s are shown in Table 2 2 Table 2 2 Waveform Magnification Magnification Factor 30 OFF Push and release to decrease magnification up to six steps Turns off the magnifier when pushed enough times or when held 31 VAR SLOW Switch This switch toggles between Variable Sweep Slow Sweep and Off calibrated sweep 32 SWEEP RATE Control Use the knob to control the sweep rate when VAR is selected and sweep duration when SLOW is selected VAR and SLOW control settings are saved and reinstated each time the mode is entered To return to calibrated sweep push the VAR SLOW button until the red LEDs are off Gain 33 VAR X5 Switch This switch controls the waveform monitor vertical gain Push and release to toggle through variable gain X5 gain and off The waveform knob controls the amount of variable gain when VAR is selected Push and hold to enable both X5 and Variable Gain 1780R Series Operator s Manual 2 13 Connectors Controls Indicators 34 WAVEFORM Control Use this knob to control the amount of variable gain when VAR is selected 35 VECTOR Control Use this knob to control the amount of variable gain when VAR is selected 36 VAR MAX Switch Push and release this switch to turn on the vectorscope variable gain which is controlled by the Vector knob Push and hold to disable the variable and set the vector Scope gains to maximum Filter NOTE The f
120. set for positive polarity u Store Low Store Used with pin 5 6 7 8 12 13 14 or 15 Preset8 Low with Pin 11 High Recall Preset 8 Low with Pin 11 Low Store current F P settings at Preset 8 location 13 Preset 5 Low with Pin 11 High Recall Preset 5 Low with Pin 11 Low Store current F P settings at Preset 5 location 14 Preset6 Low with Pin 11 High Recall Preset 6 Low with Pin 11 Low Store current F P settings at Preset 6 location N 15 Preset 7 Low with Pin 11 High Recall Preset 7 Low with Pin 11 Low Store current F P settings at Preset 7 location 3 All front panel controls operate in their usual manner during remote operation so remote selections may be changed with the front panel controls a Foraremote selection to be effective once it has been deselected with the front panel control it is either selected again with the front panel control or the ground closure is removed and reattached b Front panel LED indicators light to show the current selection 1780R Series Operator s Manual 3 17 Operating Instructions Serial Communications Interface Serial Interface Connector The rear panel SERIAL interface connector is a 9 pin sub minia ture D type connector It is used as an RS422A or RS232D interface to the 1780R Series microcontroller Drivers for both interfaces are resident RS422A is a balanced voltage digital interface and RS232D is a serial
121. sible setting of 1 unit up to 16 units and current value is shown on the readout A beep sounds when the Dead Zone has been increased or decreased as much as possible As the Dead Zone is increased the control must be turned more before it will respond but will also return to center more readily after it is turned 6 Touch lt TRACE ROTATION to obtain a test axis then use the large knob to align the display to the graticule 1780R Series Operator s Manual 3 43 Operating Instructions Au 0001 eidsip 182 1414 Alas oot UOI EJqIJE 3d02540328A pue uJOJaAEM as ag 3 660 0 1482 1epun SUORNG qsnd juo SPZ0Z08 ojoq NS 7 ALISN3INI 40j quasasd uonajes inoavayu 5 43S 043Z TdWV TVD i 43s 0uaz SYOSUND LIOA Aejdsip L49 437 Waveform Calibration Menu Display Figure 3 20 1780R Series Operator s Manual Operating Instructions 7 Touch CAL AMPL ZERO SET to obtain a menu on the waveform CRT for adjusting the calibrator zero level Adjust the large knob to overlay the two calibrator waveforms Press the front panel REFERENCE SET button to record this zero setting 8 Touch lt VOLT CURSORS ZERO SET gt to obtain a Voltage Cursor menu on the waveform CRT Use the large knob to move cursors touching the CURSOR 1 CURSOR 2 area to toggle between Cursors One and Two When cursors are aligned press REFERENCE SET to reset the displayed voltage difference to Zer
122. st and last us of the bar The time cursors can be used to locate the appropriate time interval in the center of the bar Set the time separation to 16 us and put the time cursors in the TRACK mode Move the two cursors together until they are centered on the bar Line time distortion PAL Line time distortion in PAL systems is measured with a signal that contains a 10 ms or 25 ms white bar The measurement methods given here quote the maximum departure of the bar top from the level at the center of the line bar as the amount of distortion but they can be adapted for peak to peak measure ments To make a measurement measure the maximum deviation from the center of the bar and express that number as a percentage of the level at bar center The variable gain can be used to normalize the center of the bar to 500 or 1000 mV Deviations in the top of the bar can then be read directly off the graticule in percent Ignore the first and last ms of the bar Line time distortion measurements can also be made using the voltage cursors in the RELATIVE mode Define the amplitude difference between blanking level and the bar center as 10096 Leave one cursor at the bar center and move the other cursor to measure the peak positive and peak negative deviations in the top of the bar The largest of these numbers ignore the sign is the amount of line time distortion The time cursors can be used to locate the appropriate time interval in the center of the bar
123. st the electronic graticule to just touch the signal at the point of greatest error Obtain the Short Time Distortion error from the on screen readout which is given in percent of the overall bar signal amplitude 4 28 1780R Series Operator s Manual Measurements Right CRT display Top of bar NES Signal blanking line kon Left CRT display SHORT TIME DISTORTION Figure 4 9 Short Time Distortion Electronic Graticule 1780R Series Operator s Manual 4 29 Measurements Table 4 7 Short Time Distortion Mode Front Panel Configuration VECTORSCOPE Selected by operator WAVEFORM Wavefomndisplay enabled other choices may be selected by operator INPUT Status does not change REFERENCE Status does not change FILTER Flat is selected other choices are locked up WFM SWEEPS One Line selected GAINS Wavefomrn VAR is selected WAVEFORM POSITION Horizontal and Vertical Position control settings selected by VOLTAGE amp TIMING CURSORS operator are saved and reinstated each tine the Short Tine Distortion rrode is enabled Both Voltage and Tirring cursors are available 1780R Series Operator s Manual Measurements R Y Sweep Measurement Enter R Y Sweep Mode Push the MEASURE button to enable the Measurement menu shown in Figure 4 1 Touch R Y SWEEP gt on the screen Vectorscope and waveform displays are enabled and the instrument is now configured as shown in Table 4 8 Table 4 8 R Y
124. t until lt NO gt is outlined Be sure that both lt VECT LSEL gt and lt WFM LSEL gt show ON outlined Touch LINESEL MENU again so that OFF is outlined and the menu is no longer displayed on the vectorscope CRT When different lines are displayed on waveform and vectorscope CRTs touch the line number area on the desired CRT to change the large knob assignment This assignment is indicated by a circle To display the same line on both CRTs select lt WFM VECT gt and YES The line number will be circled on both CRTs 3 4 1780R Series Operator s Manual Operating Instructions 1 OF 8 selection LINESEL present in software MENU versions 1 11 amp Up VECT LSEL _WEM LSEL Hr Rressssseesessosesssefdusecussecaeussatpu EZssepeteseeevecerevevevee 1780R NTSC ONLY ALT FIELD Figure 3 2 Line Select Menu Screen with lt 1 OF 8 Fields selected For software versions 1 13 and up A dual Line Select mode is available for making ICPM measurements when in Line Select It is described in Section 4 under JCPM Measurement Phase Shift This switch enables precision phase shift measurements Phase readout appears in the upper left hand corner of the vectorscope CRT This readout changes as the phase is shifted indicating the degrees of change since the phase reference was set Reference Set This switch is used in Phase Shift mode to store displayed phase as a reference and reset the
125. tain a 0 00 readout vectorscope CRT 5 Use the large knob to move the dot or closest of the two dots in INT REF mode to the 180 graticule line Readout now shows SCH Phase error 6 Push the SCH and PHASE buttons again to exit the mode 3 22 1780R Series Operator s Manual Operating Instructions Parade Operation NOTE Switch function is further described in Section 2 Select the Parade mode of operation by pushing the PARADE OVERLAY button shown in Figure 3 11 until the Parade LED lights Two pushes may be required depending on the previous condition If One Line or Field is currently selected instrument operation will be forced to Two Line or Field Two Line or Field Parade Parade mode simultaneously displays two signals side by side on the CRT Pushing the CH A PROBE switch will select from the following input channel combinations for side by side display CH A and CH B1 CH A and PROBE CH B1 and PROBE Pushing the CH A CH B1 CH B1 CH B2 CH B1 CH B3 switch selects CH B1 CH B2 and CH B1 CH B3 Pushing the CH B1 CH B2 CH B3 switch forces the instrument to Three Line Three Line Display The CH B1 CH B2 CH B3 switch provides a side by side display of these three inputs Pushing a two channel input switch forces the instrument to Two Line Offset Menu When only B input channels are displayed in Parade or Overlay an offset readout appears on the waveform CRT as shown in Fig ure 3 12
126. tch provides access to the Configure menu This is a three page menu touch PAGE to sequence through the pages Configure menu settings include units of measure probe input DC restorer int ext graticules 7596 100 color bars calibrator amplitude etc 19 CALIBRATE This switch provides access to the Calibration menu which toggles between waveform and vectorscope when the buttons under the CRTs are pushed Specified instrument parameters can be set using either the internal calibrator signal or an input signal for reference Waveform Calibrate menu selections are CAL SIGNAL ON OFF VOLT CURSORS ZERO SET CAL AMPL ZERO SET HORIZ POS KNOB CAL EXT HORIZ CAL HORIZ CAL TRACE ROTATION READOUT INTENSITY and VERT CAL Vectorscope Calibrate menu selections are CAL OSC ON OFF TRACE ROTATION READOUT INTENSITY and GAIN CAL 2 8 1780R Series Operator s Manual Connectors Controls Indicators Probe 20 BNC Connector This is the input connector for a X1 or X10 probe 21 CAL OUT This pin jack outputs the calibration signal used to compensate the X10 probe DC Restorer must be OFF page 1 of the Configure menu and EXT REF must be selected Display Mode Companion Switches Some switch functions are paired or grouped so that two or three switches determine one display These are referred to in this manual as companion switches Pushing the same companion switch twice in succession will change its selection as in
127. tion to phase control by touching the lt PHASE gt area of the vectorscope CRT Using the large knob to set phase set the burst vector to the 9 o clock position for an R Y versus luminance display or to the 6 o clock position for a B Y versus luminance display If there are no chrominance to luminance errors the Lissajous display will show a straight line at 45 Phase delay causes separation of the display Gain inequalities cause displacement of the display end points 1780R Series Operator s Manual 4 27 Measurements Short Time Distortion Measurement Enter Short Time Distortion Mode Push the MEASURE button to enable the Measurement menu shown in Figure 4 1 Touch lt SHORT TIME DISTORTION on the screen Vectorscope and waveform displays are enabled and the instrument is now configured as shown in Figure 4 9 and Table 4 7 Exit Short Time Distortion Measurement Mode To exit the Short Time Distortion mode push the MEASURE button again All instrument settings return to their previous state Short Time Distortion Measurement Procedure Use the Vertical and Horizontal Position controls and the Waveform VAR gain to position the signal as follows The signal baseline goes through the graticule at the lower left of the CRT the rising edge goes through the at center screen and the top of the signal goes through the in the upper right of the screen See Figure 4 9 Use the large knob to adju
128. ttings consists of 512 bytes followed by a one byte checksum All data bytes are in the range of Hex 20 to Hex TF so that they are printable ASCII characters SCH Display NOTE Switch function is further described in Section 2 Tektronix vipeo Measurement se 1 7 8O R LEFT DISPLAY RIGHT DISPLAY id OVERLAY WFM CAL Figure 3 11 Portion of the 1780R Series Front Panel With the 1780R Series there are two methods of viewing SCH Phase errors the method outlined here utilizing the front panel SCH button and Fsc Time Marks through the Measurement Menu INT REF setting two dots appear on the vectorscope compass rose The dots represent the 5046 points of H Sync 1780R Series Operator s Manual 3 21 Operating Instructions EXT REF setting only one dot appears on the vectorscope compass rose This relative mode allows the comparison of the color framing of two signals The two signals are color framed when the sync dot is within 90 of the burst vector SCH Phase Measurement Procedure 1 Select the SCH mode of operation by pushing the SCH VECT button shown in Figure 3 11 until the SCH LED lights Two pushes may be required depending on the previous condition 2 Push the front panel PHASE button 3 Apply a signal to a 1780R Series input channel and select that channel for display 4 Use the large knob to align the burst vector with the 180 graticule line normal position Push the REF SET button to ob
129. uctions equal that value when the back porch of one display is aligned with the white bar of the second display The 700 mV 98 0 IRE calibrator amplitude NTSC and PAL can be used to adjust component levels for component video d The 300 mV PAL calibrator amplitude is used for adjusting sync amplitudes Menu Information CALIBRATE Figure 3 15 Left Side of Front Panel showing Menu Buttons and Touch Screen Menu Documentation Overview This section describes the Password Preset Calibrate Configure and Measure menus 1780R Series Operator s Manual 3 31 Operating Instructions Many selections are made by touching the desired word on the CRT screen as shown in Figure 3 15 This is indicated by the use of the word touch as opposed to push for front panel switches The touch screen menu quadrants are illustrated as a documentation tool and do not actually appear on the CRT screen If adjustment of quadrants is necessary refer to the 780R Series Service Manual Menu Access The Preset Measure Configure and Calibrate menus are enabled by four front panel menu buttons shown in Figure 3 15 Access to the Preset and Calibrate menus can be restricted by password Password operation is enabled disabled by a setting of S385 on the MPU board Instrument is shipped in the not enabled position Refer to the 780R Series Service Manual for the location of 385 The Preset Measure and
130. ude Me xirrumlnput Voltage Frequency Response X and Y Input Phase Matching Performance Requirements 2 to 9V peakto peak 15 V combined peak signal and DC DC to gt 500 kHz lt a trace width of separation at 20 kHz Table 5 9 Vectorscope SCH Phase Display Supplemental Information DC coupled differential inputs through rear panel connector Adjustable full scale deflec tion O dBmto 12 dBmfor 600 Q system Factory set to O dBm 3 cB point Single ended Phase matching above 20 kHz may be in proved by adjust ing Vertical Deflection Arrplifier VHF Con pensa tion Performance Supplemental Characteristics Requirements Information Accuracy Absolute t5 phase at 25 C Relative 2 Terrperature Stability 0 1 phase C Acquisition Tine lt 1 sec Display Phase Error X125 calibrated for zero Caused by CRT Georre display phase error at zero try Variations SCH phase 5 18 1780R Series Operator s Manual Specifications Table 5 9 Vectorscope SCH Phase Display Cont Supplemental Characteristics Information Input Tirring Stable display with any tirre relationship between sig nals on CH A CH B and EXT Display Range Ext Reference Int Reference Typically 280 Supplemental Characteristics Information Waveform Monitor Viewing Area 80X 100 rmm Horizontal Scale 12 5 Divisions Verti cal Scale 170 IRE NTSC 1 19 volts PAL
131. ugh they may not both be on screen at the same time Pushing REFERENCE SET has no effect while Timing cursors are enabled Timing cursors are not valid in Field modes 1780R Series Operator s Manual 3 1 Operating Instructions For software versions 1 13 and up installed in instruments SN B020100 and up The Timing Cursor dots are positioned on the Voltage Cursors while in Line Select mode for ease in viewing the Timing Cursors Voltage Cursors Push the VOLTAGE switch to enable the voltage cursors and obtain a menu on the vectorscope CRT Use this menu to choose cursors that track together or are positioned separately and to choose between absolute and relative readout Cursor One appears as a dashed horizontal line and Cursor Two as a series of two short dashes on the waveform monitor display The large knob provides continuous adjustment of cursors The lt gt buttons provide adjustment in discrete steps of 0 1 IRE or ImV depending on the Configure menu ABS UNITS selection To change the large knob assignment from one cursor to another touch the quadrant labeled lt CURSOR 1 CURSOR 2 gt The current assignment is outlined by a box When SEPARATE is selected by touching the lt SEPARATE TRACK area of the screen the cursors are moved one at a time currently selected cursor is outlined When TRACK is selected both cursors move at once When ABSOLUTE is selected the readout in IRE or mV in
132. ure 1 Apply a staircase signal or a ramp signal with subcarrier to the 1780R Series 2 Touch SINGLE 1780R Series Operator s Manual 4 5 Measurements Use the vectorscope variable gain control to set the amplitude of the chroma to be measured to the edge of the compass rose Use the large knob to set the phase of the chroma to be measured to the nine o clock position See Figure 4 3 Use the Waveform Vertical Position control to place the beginning of the trace on a reference graticule mark Differential phase is that amount of signal that lies above or below the reference graticule mark Read the amount directly off the graticule scale waveform CRT 1 major division 1 10 IRE NTSC or 100 mV PAL Double Trace DIFF PHASE Measurement Procedure 1 Apply a staircase signal or a ramp signal with subcarrier to the 1780R Series Touch lt DOUBLE gt Use the vectorscope variable gain control to set the amplitude of the chroma to be measured as desired usually to the compass rose In Double DIFF PHASE mode only this setting may be altered to improve vertical resolution without affecting the accuracy of the readout Use the large knob to bring the left ends of the two traces waveform CRT together Push the REFERENCE SET front panel button Phase readout should be 0 00 Locate the point of largest deviation between the two traces and use the large knob to bring the two traces together at that point
133. urrent will revert ONE LINE or CH B2 ard CH B3 or to ONE LINE or FIELD operation FIELD CH A and Probe or when Overlay is selected Probe and CH B1 or CHA and CH B1 or CH B1 and CH B2 and CH B3 A Other combinations not permitted and will cause a beep to sound 25 WFM WFM CAL Push and release this switch to toggle between standard waveform display and waveform plus calibrator signal Ref 26 INT EXT CW This switch toggles between an internal signal incoming video and an external signal rear panel input for sync and subcarrier reference Push and hold this switch to select the rear panel CW input as a subcarrier reference The LED will indicate whether CW Sync has been set for internal or external via the Configure menu page 3 27 LINE FIELD Push and release to toggle between LINE and FIELD Line and Field combinations are limited only when in Overlay and Parade modes See Table 2 1 Wfm Horizontal 28 ONE TWO THREE Push and release to toggle between ONE and TWO Push and hold to select THREE The Line and Field combinations are limited only when in Parade or Overlay mode as shown in Table 2 1 Magnifier 29 ON gt Push and release to turn on the magnifier then push again to increase magnification Push and hold to turn on the magnifier 2 12 1780R Series Operator s Manual Connectors Controls Indicators and continuously increase the magnification factor Magnifica tion factor
134. ve the display left and right Below SNs B020245 only this is a spring activated control turn the control more to move the display faster A beep indicates the limits of the control range Position ing range is greater for waveform monitor than for vectorscope Precision Measurement Large Knob NOTE Detailed measurement information is located in Section 4 The TIME and VOLTAGE CURSORS PHASE SHIFT and LINE SELECT switches are enabled by pushing the corresponding switch and exited by pushing that switch again While any of these modes is enabled rotating the large knob provides continuous adjustment and pushing the lt gt buttons provides single step adjustment Two three or all four of these functions can be enabled at once Separate readouts are provided for each function Large knob assignment is determined by the last function button pushed and can be changed by touching the desired readout area of the CRT screen Current assignment is circled NOTE Detailed Timing and Voltage Cursor information is located in Section 3 9 TIME CURSORS This switch enables the timing cursors The Timing Cursor menu on the vectorscope CRT provides a choice of cursors that track together or are positioned separately and a choice between locate and measure The readout indicates the time difference between Cursor One and Cursor Two in increments of 5 nanoseconds If magnifica 1780R Series Operator s Manual 2 5 Conne
135. w sweep Select the baud rate for the serial interface lt ON gt enables on screen readouts of data during vectorscope operation lt OFF gt disables the readout Full screen menus are not affected lt ON gt enables on screen readouts of data during waveform monitor operation lt OFF gt disables the readout Full screen menus are not affected Beep is either on or off When on audio indicates when touch screen selections have been made When lt ON gt with vectorscope CRT selected will revert to waveform CRT selection after 30 seconds of no knob activity The version of software currently installed 1780R Series Operator s Manual 3 55 Operating Instructions Measure Menu Left CRT display SELECT MEASUREMENT K FACTOR CHROMA DISTORTION Available for TIME 1780R MARKS NTSC ONLY Figure 3 27 Measure Menu Screen Using the Measure Menu Push the front panel MEASURE button to enter the Measurement menu illustrated in Figure 3 27 To select a measurement type touch the desired measurement on the screen Selections are described in Table 3 9 Example touch DP amp DG to access simultaneous Differential Phase and Differential Gain measurements The menu display is replaced by vector and waveform displays with the selected measurement indicated in the upper left corner of the vectorscope CRT 3 56 1780R Series Operator s Manual Operating Instructions
136. ys Differential phase is the amount of the left signal that is above or below the graticule reference line Read the amount directly off the graticule scale 1 major division 10 IRE or 100 mV 1 Differential gain is the amount of the right signal that is above or below the graticule reference line Read the amount directly off the graticule scale 1 major division 10 IRE or 100 mV 1 1780R Series Operator s Manual 415 Measurements Noise Measurement Enter Noise Measurement Mode Push the MEASURE button to enable the Measurement menu shown in Figure 4 1 Touch NOISE on the screen Exit Noise Measurement Mode To exit Noise mode push the MEASURE button again All instrument settings return to their previous state Noise Measurement Procedure Input the signal to be measured to the 1780R Series and display on screen Noise can best be evaluated on a constant luminance portion of the signal such as back and front porch sync tip or color bars white bar Adjust the large knob so that the gap between the waveforms just disappears VAR GAIN is automatically set to maximum for lowest internal noise Waveform X5 Gain can be selected for better accuracy with low noise Read the signal noise ratio directly from the on screen readout 4 16 1780R Series Operator s Manual Measurements ICPM Measurement Enter ICPM Measurement Mode Incidental Carrier Phase Modulation Push the MEASURE button to

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