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Tektronix 1730-Series User's Manual

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1. Chroma filter must be selected Baseline at 50 IRE and displayed subcarrier adjusted to 100 IRE with VAR gain i Displayed differential gain is 1 or less with 10 to 90 APL changes Deflection Factor 1V Full Seale 140 IRE 1 0 V within 1 with 1 V input FLAT response selected Input signals between 0 8 V and 2 V can be adjusted to 140 IRE 1 0 V display 160 mV and 400 mV for X5 Gain Variable Gain Range 1 V signal can be positioned so that peak white and sync tip can be placed at blanking level with tne DC RESTORER on regardless of gain setting Position Range Applies to calibrated gain positions only 1730 SERIES INTRODUCTION Table 1 1 cont PERFORMANCE REQUIREMENTS 5 Vde peak ac Displays in excess of 200 IRE 1 428 V may cause frequency response aberrations DC Input Impedance Greater than 15 kQ Unterminated CHARACTERISTIC SUPPLEMENTAL INFORMATION CHECK STEP Maximum Absolute i Input Level Return Loss 750 Video At least 40 dB from A and B channels loop through Inputs CH A CH Di 50 kHz to 6 MHz terminated in 750 Input in use or not in use instrument power on or off all deflection factor settings Greater than 50 dB of isolation between channels Measured at Fc between Channel A Channel B and EXT REF Crosstalk
2. 1730 SERIES INTRODUCTION Table 1 9 ENVIRONMENTAL CHARACTERISTICS CHARACTERISTIC SUPPLEMENTAL INFORMATION Temperature Non Operating Operating Altitude Non Operating Operating 55 Cto 75 C 0 to 50 C To 50 000 feet To 15 000 feet 15 minutes each axis at 0 015 inch frequency varied from 10 55 10 Hzin 1 minute cycles with instrument secured to vibration platform Ten minutes each axis at any resonant point or at 55 Hz if no resonant point is found Shock Non Operating 30g s 1 2 sine 11 ms duration 3 shocks per surface 18 total Transportation Qualified under NTSC Test Procedure 1A Category II 24 inch drop Humidity Will operate at 95 relative humidity for up to five days Table 1 10 CERTIFICATION CHARACTERISTIC SUPPLEMENTAL INFORMATION Safety EMI Designed to meet or exceed UL 1244 Factory Mutual 3820 CSA Bulletin 556B IEC 348 l FCC EMI Compatibility FCC Rules Part 15 Subpart J Class A VDE 0871 5 Class B Vibration Operating Table 1 11 PHYSICAL CHARACTERISTICS CHARACTERISTIC SUPPLEMENTAL INFORMATION Dimensions Height 5 1 4 inches 133 4 mm Width 8 1 2 inches 215 9 mm Length 18 1 8 inches 460 4 mm Weight Approximately 8 5 Ibs approximately 3 8 kg Unis 1730 SERIES OPERATING INSTRUCTIONS SECTION 2 O
3. Front Panel Preset 2 Front Panel Preset 3 AUXILIARY Connector The rear panel AUXILIARY connector is a 9 pin D type connector It is used to operate a companion 1720 Series Vectorscope Line and Field selection information is provided to the Vectorscope over the bus that is contained in this interface Fig 3 5 shows the AUXILIARY connector pin assignments REV JAN 1987 3 5 1730 SERIES INSTALLATION TXD EXT STROBE OUT Fig 3 5 Rear view of the 1730 Series rear panel showing AUXILIARY connector pins with their functions MECHANICAL INSTALLATION Rackmounting The 1730 Series requires a metal cabinet for safe operation In addition electrical specifications are valid only when the instrument is properly shielded by a cabinet Any of the field installable upgrades 1700F00 1700F02 or 1700F051 satisfy these requirements The plain metal cabinet 1700F00 has four 0 156 inch diameter holes in the bottom of the cabinet depression that are used to mount the instrument solidly to a surface such as a metal shelf in a rack With the optional 1700F05 Side by Side Rack Adapter the 1700 Series instrument can be mounted in a standard 19 inch rack side by side with another half rack sized instrument such as a companion 1700 Series instrument 1720 and 1730 operating together The adapter includes two attached cabinets that are equipped for rack mounting If only one instrument is mounted in the rack adap ter
4. Enables internal sync reference Low Enables external sync reference FLD VFLD 2 High NTSC Field 1 trigger in 2 Field Sweep PAL and PAL M Field 2 trigger in 2 Field Sweep NTSC Field 2 trigger in 2 Field Sweep PAL and PAL M Field 1 trigger in 2 Field Sweep LIN ILINSELEN EN Blanks ert for Line Select except during LINSEL high CEN AXIS Analog signal to horizontal deflection amplifier for Line Select readout Enables CH A input Low Enables CH B input SES RES ere EC SES SC Enables Flat no filter Enables vertical variable gain Enables fast DC Restorer if ON DCR is high 4 10 REV APR 1987 U725 is the NOVRAM used to retain the current front panel status and the front panel status for the Stored Recalls Auxiliary Data is written in and read out through pins 3 and 4 pin 1 of U522 controls data in and out Pin of U522 provides the serial clock Pin 14 provides the chip enable These three lines Clock Read Write and Chip Enable are active when 1 power is turned on 2 any front panel switch is pressed 3 aStore or Recall is requested U726 is the power down detection circuit It detects the loss of instrument power in time for the NOVRAM U725 to execute a save operation When the 5 V supply drops a few hundred milli volts pin 7 is pulled low which causes U405 to Store its current status The front panel and Auxiliary St
5. Q179 is the current source for Q180 and Q181 The collector signals from this amplifier stage drive the emitters of common base transistors pins 8 and 11 The collectors of these common base stages drive the output stages Q380 and Q386 which are also con nected in a common base configuration The load resistors for these output stages are R384 and R385 C280 is HF compensation for the Output Amplifier The CRT deflection plates are driven by the col lectors of Q370 and Q386 through 5 5 uH inductors The amplifier employs negative feedback to mini mize distortion The emitter and base impedances of the common base transistors pins 6 and 10 of U188 are very close to the emitter and base impedances of differential transistor pair pins 3 and 16 of U188 Any distortion from transistor pair pins 3 and 16 will be at the emitters of pins 8 and 11 Q290 and Q291 invert this distortion and feed it back out of phase to the emitters of the output transistors which effectively subtracts it from the output The Y Axis signal that is used for the vertical read out is processed for output in exactly the same way as video Analog switch U277 has the two sections pins 14 and 15 for video and pins 2 and 3 for read out that couple the vertical or Y Axis to the Output Amplifier at all times so that one of these signals drives the Vertical Gutput Amplifier Pix Monitor The Picture Monitor Output Amplifier consists of U978 and Q877 The inp
6. automatie determination of the reference standard MISCELLANEOUS ROTATE 21 A 270 serewdriver adjustment that aligns the display with the graticule VCAL 22 A 270 screwdriver adjustment that sets the vertical amplifier gain Is normally used with the CAL position ofthe REF switch HCAL 23 A 270 screwdriver adjustment that sets the timebase Can be used accurately with the CAL position of the REF switch in the 2H Sweep READOUT 24 A 270 screwdriver adjustment used to change the brightness of the readout portion of the CRT display relative to the waveform intensity REAR PANEL CONNECTORS Signal input power input RGB input Remote Sync Input Picture Monitor Out Auxiliary Control Output and Remote Control are all located on the 1730 Series rear panel Because of the similarity of the 1730 and 1720 Series rear panels WAVEFORM MONITOR is printed on the 1730 Series rear panel See Fig 2 3 for the locations of the rear panel connectors 2 6 REV APR 1987 1730 SERIES OPERATING INSTRUCTIONS joued 1891 S8L19S OELT L Z BA AN HONOXHL 4001 WHO SL O mie o RE a Lege bag eege g SINANI UNNOYS HLYV3 O1 DIZNNOJ 38 LISAH HODNGNO DNIGNNOHO JAHDALOY 4 GYO UZAMOd AHL ADOHS 1521412373 AIGAY OL 3 6 AadAL 3 VZ ABST HLINA A ING 35114 32 VIAJU NOHDILOSA 3814 GANNELNGD WOS Do O PPP JO NOILNY2 11LOW3U mo H CHOE Ce 1041NO2 AUVIEXNY aroe f A a DNYU DN GA GIS AUNINIII
7. instrumeni warms up 20 minutes minimum Initial Front Panel Setup 1730 Series Monitor FILTER FLAT REF INT INPUT A GAIN Off no indicators on VERTICAL POSITION as is DC REST OFF SWEEP 2 LINE MAG off no indicators on FIELD asis HORIZONTAL POSITION asis FOCUS asis SCALE as is INTENS as is DOWN as is UP as is LINE SELECT off no line number readout on CRT RECALL SETUP as is ROTATE as is V CAL as is HCAL as is READOUT as is POWER ON 1730 SERIES OPERATING INSTRUCTIONS Obtain Display Adjust the INTENS and FOCUS controls for the desired brightness and a well defined display Adjust the multi turn VERTICAL POSITION control to place the display blanking level on the graticule OIRE NTSC and PAL M or 300 mV PAL line Center the display with the HORIZONTAL POSITION See Fig 2 5 wor rovn Fig 2 5 2 Line color bar display in FLAT filter mode 2 10 Adjust the SCALE illumination control for the desired graticule scale brightness Check the Rotation ofthe Display Variations in the earth s magnetic field may make adjustment of the ROTATE control necessary at installation time or whenever the instrument is moved Check that the display blanking level is parallel to the horizontal axis If not adjust the ROTATE screwdriver adjustment until the sweep is parallel to the horizontal axis REV APR 87 Calibrate Display The CAL mode on the REF switch enables the Waveform Monitor cal
8. the signal current is provided by Q387 and is equal to and opposite from the current change in Q382 The Limit Center R489 adjusts the balance in the bias currents in Q382 and Q387 R387 and C387 provide bandwidth and stability compensation in this stage R486 and C389 provide high frequency peaking to improve the flat response R385 and C385 improve the low fre quency transient response REV JAN 1987 4 5 1730 SERIES THEORY OF OPERATION Q280 and Q289 form common base stages to couple the complementary signal currents to the non induc tive ert load resistors R184 and R186 The resulting signal voltages are coupled to the ert s vertical deflection plates R183 and R187 shunt the load resistors to provide the proper load resistance for the high bandwidth output signal L180 and L190 are adjustable shunt peaking coils which increase the vertical bandwidth and allow precise flat response adjustment Vertical Output Amplifier SN BO19999 amp Below The Vertical Output Amplifier converts the approx imate 1 V video signal amplitude into a push pull signal of sufficient amplitude to drive the CRT U188 is a transistor array that contains four of the Output Amplifier transistors The signal is applied to the base of Q180 which is wired up in a common emitter configuration with Q181 which converts the incoming vertical signal to a differential signal that drives two of the bases of U188 pins3 and 16 a differential amplifier
9. 15 immediately below the colon in the readout Lines displayed in the LINE SELECT mode have their active video intensified on the PIX MON OUT signal UP 17 Increments the line count when enabled Holding the UP push button in increments faster DOWN 18 Decrements the line count when enabled Holding the DOWN push button in decrements faster Holding either button down until the count passes the beginning or end of field causes the count to shift to the other field Table 2 2 Color Standard Switched From All Field 1735 NTSC PAL Translations for Dual Standard Switching Color Standard Translated All Field eee ae 120101 me at me ae NATA 17100 mel OTO ma o Where there is no corresponding line number associated with a standard change line count is reset to line 19 the reference position in the vertical interval REV APR 1987 2 5 1730 SERIES OPERATING INSTRUCTIONS When LINE SELECT is enabled holding in both the UP and DOWN push buttons returns the line count to Field 1 Line 19 RECALL SETUP STORE 19 Enables the storage of front panel settings including line number in four different memory locations To store a front panel setup the STORE switch is pushed and then one of the four RECALL SETUP switches is pushed When STORE is pushed all front panel lights cycle off and on approximately 15 times to indicate that the front panel as it is currently set up
10. Monitor Output on the rear panel See Fig 4 2 Fig 4 3 and Fig 4 4 are timing diagrams that show the signal relationships for 2 Line and 1 Line sweep rates in the LINE SELECT mode SWEEP AND OUTPUT AMPLIFIERS DIAGRAM 4 This diagram contains the Sweep Generator Magni fier Amplifier and Horizontal Output Amplifier circuitry Sweep Generator Integrators U552B and U552A are Line Rate and Field Rate Sweep Generators respectively One is disabled when the other is running Transistors Q451 and Q450 discharge the feedback capacitors when a trigger pulse is applied to reset the sweep Comparator U445A disables the Sweep Generator so that it can not accept a trigger signal until the ramp is about three fourths complete If no trigger signal appears the sweep increases until it triggers U445B which resets the Sweep Generator and provides a sweep with no input signal REV JAN 1987 4 7 1730 SERIES THEORY OF OPERATION a COMP SYNC H SYNC LIN SEL EN LINSEL LIN STRB PIXSTRE ROEN BLANK DOT BLANK 2 HUN SEL EN eee SS b DISPLAYED UINE COMP SYNC H SYNC LIN SEL EN LINSEL LIN STRB PIXSTRB ROEN BLANK DOT BLANK 2 HUN SEL EN Fig 4 2 Elements for line select timing a Line select off b 2 Field line select The Microcontroller can retrigger the Line Rate Sweep Generator via R646 for purposes of synchro nizing the sweep in LINE SELECT or during filter and input switching
11. Retrace time is determined by one shots U741A and U741B Gate U334B combines the retrace signals to blank the beam during retrace This gate also com bines blanking and unblanking of the display when the instrument is in the LINE SELECT mode SWEEP RAM DISPLAYED 2H SWEEP LINSELEN LINSEL LIN STRB PIXSTRB BLANK2 H LIN SEL EN Fig 4 3 Relative line select timing elements for the 2 Line display The ramp signal from the Sweep Generator drives the Horizontal Positioning and Magnifying Ampli fier through R559 Magnifier Amplifier Transistors in U564A and Q566 form an operational amplifier which positions and magnifies the sweep signal R557 and R558 are the feedback resistors Gains when magnifying are set by R552 1 us Cal and R553 0 2 ps Cal Horizontal positioning is con trolled by U655B through R658 The staircase sig nal when in the RGB mode drives the amplifier through R657 The length of the sweep when in RGB mode can be set by jumper J456 to accommo date either three or four step shortened sweeps for RGB and YRGB modes respectively Comparators U465A and U465B sense the output of the Magnifier and Position Amplifier to turn off the ert beam when it is off the edge of the screen 4 8 REV JAN 1987 SWEEP RAMP DISPLAYED comp sync _ HN HSYNC 2H SWEEP LIN SEL EN LINSEL LIN STRB PIXSTRB ROEN BLANK DOT BLANK H LIN SEL EN Fig 4 4 Relative line selec
12. Sync amplitude between 143 mV and 4 V will synchronize sweeps De Input Impedance Unterminated Return Loss 75Q At least 40 dB from Loop through terminated in 75 Q 17 i 50 kHz to 6 MHz instrument power on or off Absolute Maximum 12 Vdc plus peak ac Input Voltage i Remote Sync Amplitude Input and enabled through rear panel REMOTE connector Greater than 15 kQ 2 0 to 5 0 V square wave or 4 0 V comp sync Input Impedance 1 MQ 30 60 Hz 25 50 Hz square wave will sync 2 FLD Sweep Remote sync bypasses the sync stripper and field ID circuits Sweep Trigger Internal jumper selects polarity Polarity Normal Negative going edge line sync positive edge of field sync Inverted Positive going edge line sync negative edge of field sync H 1 10 REV APR 87 1730 SERIES INTRODUCTION Table 1 6 RGB YRGB Mode PERFORMANCE CHARACTERISTIC REQUIREMENTS RGB YRGB Staircase Amplitude RGB or YRGB Will display either a 3 step or 4 step RGB YRGB parade or overlayed display A 10 V input will result in a horizontal display of 9 divisions 1 4 major divisions Field or line rate of displayed video or external sync signal as selected by front panel HORIZONTAL controls a Sweep Repetition Rate MAGnifier Sweep Length 3 step 3 4 4 1 divs 4 step 2 5 3 1 divs REV JAN 87 SUPPLEMENTAL INFORMATION Internal jumper is used t
13. a blank panel assembly 1700F06 is available to insert in the empty rack adapter cabinet Fig 3 6 shows the details of this type of rack installation The rack adapter and panel 1700F05 and 1700F06 are available through your local Tektronix field office or representative Custom Installation Fig 3 7 shows a typical custom installation and is provided as a reference for installations in applica tions such as consoles It is possible to mount the instrument with either a flush front pane or have the front casting protruding The limiting factors are the depth available and the size of the opening cut in the console In both cases plan for approxi mately 3 inches of rear clearance for bne and power cord connections In order to safely hold the 1700 Series instrument the cabinet should be attached to a shelf strong enough to hold the instruments weight The holes in the cabinet that normally are used to mount the feet can be used to attach it to such a shelf Cabinet Options All qualification testing for the 1730 Series was per formed with a cabinet 1700F00 installed in order to guarantee compliance with all specifications the instrument should be operated in a cabinet There are two cabinets that can be ordered as optional accessories for the 1700 Series instruments The two cabinets are similar One the 1700F02 which is the cabinet designed for portable applications has a carrying handle the standard cabinet doe
14. also isolated from the power line An Opto isolator U455 is used to drive pin 9 of the Pulse Width Modulator The intensity of the light from an internal LED driven by the Error Amplifier sets the collector volt age for the light sensitive transistor in U455 The resulting output voltage becomes the comparison input for U558 pin 9 that in turn determines its duty cycle R562 between pin 9 and the emitter of Q568 is the load resistor for U455 The Opto isolator is driven by the output of the Error Amplifier U242 through Q344 The 5 V Adjust R445 is part of U242 s input voltage divider and when it is adjusted sets the duty cycle of U558 through U455 Current Limit Q565 Q570 and Q568 form the Current Limit circuit R270 is the current sense resistor providing base current to Q570 through a divider consisting of R568 and R567 C568 snubs high frequency voltage spikes If the current in R270 gets high enough to turn on Q570 Q565 is turned off and the voltage across R564 pulls pin 10 of U558 high and shuts off U558 In the Current Limit mode the Power Supply runs in and out of current limit in an oscillatory fashion which produces a high pitched squealing sound in short bursts If the load causes the Current Limit to be active for more than a few hundred milliseconds C567 charges and turns on Q568 Q568 and Q570 then turn each other on in a positive feedback reaction which holds pin9 of U558 low and shuts the
15. exceeds 18 us simply measure the bar top in increments by positioning the bar to the left or right from the leading or trailing edge Note that when the leading or trailing edge is on the appropriate arrow the first or last 1 us is automati cally excluded from the measurement Pulse to bar K Factor measurements are made using the solid and short dashed lines to the left of the line time distortion structure These lines are scaled according to the following formulas 1 1 OKR SY and GERT 1 4K 1 4K Where K 0 02 for 2 K Factor dashed lines K 0 04 for 4 K Factor dashed lines Calibrated 5X Gain increases resolution to 0 4 and 0 8 This scaling is described in detail in CCIR Standard Volume 5 1966 Make sure that the center of the bar is at 100 IRE when blanking level is at OIRE use VAR to adjust gain if necessary If necessary use the HORIZON TAL POSITION control to place the 2T Pulse over the measurement area and measure its amplitude The top of the pulse falling within the dashed lines equals less than 2 K Factor Horizontal Scales for NTSC and PAL Graticules The Horizontal reference line is the baseline at 0 IRE NTSC and PAL M or 0 3 V PAL This tim ing line is 12 divisions long on NTSC graticules 12 4 divisions for PAL and takes on different tim ing intervals depending on the sweep rate selected In 2 Line Sweep each major division is 10 ps and when magnified X10 each major divis
16. its amplitude The top of the pulse falling within the dashed lines eguals less than 2 K Factor PRESET FRONT PANEL MEASUREMENTS The 1730 Series has four front panel setups stored in internal memory A TTL low or ground closure on one of the PRESET enables pins 12 through 15 of the REMOTE connector selects one of these pre programmed front panel setups Table 2 2 shows the preset front panels that are stored in memory 2 18 REV APR 1988 When the 1730 Series is used as a direct replacement for the TEKTRONIX 528A Waveform Monitor which used de voltage levels as enables it will be necessary to use a conversion circuit to change these positive voltage levels to apparent ground closures See SECTION 3 for a simple conversion circuit RGB YRGB DISPLAY RGB staircase signals either 3 or 4 step are input to the 1730 Series through the rear panel REMOTE connector A 10V input will provide a horizontal sweep length between 7 6 and 10 4 major graticule divisions An adjustment on the Main Circuit Board R856 can be used to adjust for offsets in various staircase signals RGB sweep is enabled by a TTL low which can be a ground closure applied to pin 2 of the rear panel 15 pin connector There is a connector drawing in SECTION 3 INSTALLATION of this manual The staircase signal is input through pin 1 of the connector 1730 SERIES OPERATING INSTRUCTIONS Field and line rate displays controlled by front panel SW
17. sample and hoid circuit that provides the fast clamping needed for the Fast DC Restorer Clamping as with the first clamp occurs at the back porch 1730 SERIES THEORY OF OPERATION FRONT PANEL CONTROLS PRESETS RECALL RAD TXD LS STROBE CH A CH B EXT REF INPUTS VERTICAL MICROCONTROLLER REMOTE SYNC RGB ENABLE RGB INPUT HORIZONTAL REMOTE INTERFACE AUXILIARY 1 INTERFACE Fig 4 1 Simplified representation of the 1730 Series Waveform Monitor A Vertical Positioning voltage along with the con ditioned video signal is input to the Switchable Gain Amplifier Amplifier gain and positioning range are increased by a factor of 5 when X5 Gain is selected at the front panel The limiter stage that follows this amplifier prevents overdriving of the Output Amplifier The conditioned video signal and the Y component of the Readout from the Microprocessor are input to the Vertical Output Amplifier which matches impe dances and normalizes gain approximately 40 V for 8 cm of vertical deflection to drive the ert vertical deflection plates Horizontal Composite video from either internal Channel A or B or external reference has all active video stripped away by the Sync Stripper to leave only sync for the 4 2 Sweep Trigger Remote sync bypasses the Sync Stripper and triggers the sweep directly when ena bled Any of these three sync sources can be used the REMOTE connector to provide the Para
18. which accomodates both NTSC and PAL scales REV APR 87 Because the internal graticule is on the same plane as the CRT phosphor it eliminates viewing and pho tographic paralax errors The graticule is illumi nated using a front panel SCALE adjust control so that the level of graticule brightness can be adjusted to optimum for viewing or photographing needs The major differences between the NTSC and PAL graticules are in the vertical scales In the para graphs that follow each of the vertical graticule scales will be discussed separately while the hori zontal scales are discussed together NTSC Composite Video Graticule Vertical Scales The NTSC graticule has two main vertical scales to facilitate typical measurements See Fig 2 17 The left side scale is marked in IRE units and extends from 50 to 120 IRE in 10 IRE increments An IRE unit is equal to 7 14 millivolts Black level set up is denoted by a dashed line at 7 5 IRE am mt mt A o AO A Ar A vr mm mm 1730 SERIES OPERATING INSTRUCTIONS There are 32IRE and 4IRE markings at the cen ter of the 40 TRE line sync tip to assist in measur ing sync amplitude This scale is designed to be used with the 2 Line or 2 Field Sweep rates The scale on the right side of the graticule is for mea suring depth of modulation The scale extends from 0 at the 120 IRE line to 100 at sync tip 40 IRE line The boxed area slightly to the right of center at the 10
19. 0 IRE level is scaled in 2 and 4 inerements for precise tilt measurements This structure is designed to work with an 18us half amplitude duration HAD 2T Bar The set of solid and short dashed lines to the left ofthe Bar tilt measurement structure is used to measure pulse to bar ratio they are weighted to inelude K Factor ratings of 2 and 49 100 2 84 K FACTOR NTSC Fig 2 17 NTSC graticule REV APR 1987 1730 SERIES OPERATING INSTRUCTIONS Making Measurements To use the NTSC vertical scale to make line time distortion and pulse to bar ratio measurements set the signal blanking level at the graticule blanking line 0 IRE and position the leading edge of the Composite Test Signal bar to the ascending arrow just right of graticule center Check to see if insertion gain is unity If it is not adjust the 1730 Series VAR for exactly 100 RE of signal amplitude from baseline to the middle of the white bar Check to see that the negative going bar transition passes through the descending arrow To measure the K Factor line time distortion mea sure the largest deviation of the bar top tilt or rounding within the structure The structure is designed to ignore the first and last 1 us of the bar where short time distortions ringing overshoot undershoot etc occur The solid outer box equals a 4 K Factor while the dashed line inner box equals a 2 K Factor For signals with a bar half ampli tude duration that
20. 10A Power Plug ACCESSORIES Standard Accessories The following accessories are shipped with the 1730 Series See the Accessories illustration at the rear of the manual for part numbers 1 1730 Series Instruction Manua 1 Power Cord with the selected power plug option 1 Replacement Cartridge Fuse correct rating for the power plug option 1 Male D Type Subminiature 15 Pin plug for use with the REMOTE input 1 Plastic Housing Remote Tektronix Part No 200 1666 00 Optional Accessories There are a number of accessories that can be used with a 1730 Series Waveform Monitor The following is a list of the most common accessory items for this series of waveform monitors 1700F items are Field Upgrade Kits that are installed by the customer instructions are included in all Field Upgrade Kits Cameras C5C Option 02 or C7 Option 03 Viewing Hood 016 0475 00 Front Panel Cover 200 1566 00 1700F00 Plain Cabinet painted silver grey 1700F02 Portable Cabinet painted silver grey 1700F05 Side by Side Rack Adapter 1700F06 Blank Half Rack Width Panel 1700F 10 DC Power Converter 1 2 REV APR 87 Safety Information The 1730 Series is intended to operate from an ac power source that will not apply more than 250 V rms between the supply conductors or between either supply conduetor and ground A protective ground connection by way of the grounding con ductor is essential for safe operation except
21. 3 respectively The selection of either Channel A or B is determined by the level of the CH B signal at pin 10 of U492 When low CH B is selected if its high the choice is CH A The out put pin 6 drives a current mirror with three output sources One of these sources Q793 drives the rear panel Picture Monitor Output Amplifier Q792 is the source for the internal sync signal and Q791 is the driving source for the remainder of the vertical With a LV input signal and R392 or R393 at 900 Q there will be 1 11 mA of signal current flowing into the channel switch This much signal current is available from Q791 and Q793 however Q792 can only provide 0 5 mA of signal current because its emitter resistor R694 is twice the resistance of R792 External Sync Input and Source Switch The external sync signal from the rear panel EXT REF loop through is buffered by an operational amplifier in U795 It has a gain of 1 that is deter mined by the combination of input resistor R997 15 k and feedback resistor R898 15 k This ampli fier drives Q798 the current source for the syne switch The internal sync source is from the collector of Q792 It is one input to the sync source switch which is comprised of U795 CR696 CR697 CR698 and CR699 Switching between internal and exter nal is accomplished with the emitter coupled pair in U 795 pins 1 2 3 4 and 5 When pin 2 of U795 is pulled low external sync is selected when it is hi
22. 4 and 15 to input horizontal line sync and vertical field syne These inputs are used by the Microprocessor to decipher line select data and real time switching functions A B and Low Pass Flat switching Pins 10 and 11 which are also Port 3 are used for the 1720 Series Auxiliary bus functions TXD pin 11 and RXD pin 10 These lines are buffered by U809 and directly output to the rear panel AUXILIARY connector Port 3 5 pin 15 is an input to the Microprocessor that when high indicates that the instrument is running NTSC standard This dictates Chroma fil ter selection and line numbering for the LINE SELECT mode When pin 15 is low the instrument is running the PAL standard Port 3 7 pin 17 is the remote input enable for U731 and U809A The Remote functions use Port 0 for an VO There are a number of control lines originating on the Microcontroller diagram Table 4 1 lists these lines the condition of the line and the expected result REV JAN 1987 4 9 1730 SERIES THEORY OF OPERATION Table 4 1 Control Line Functions 5 Mm Ee pu or tie pietnom on n Liesen 2H SWP PHASE Resets 2H Sweep Generator for Line Select and real time switching wei en sed in serial port diagnostics and Auxiliary i emo Dass LIN FLD High lor2Line display Low 2 Field display TWO ONE High 2 Field or 2 Line display Low 1 Line no single field display possible SITE Enables Horizontal Magnifier High
23. 730 Series Waveform Monitor of the space 1730 SERIES INTRODUCTION SECTION 1 INTRODUCTION The TEKTRONIX 1730 Series is an 8 1 2 inch wide by 5 1 4 inch high Waveform Monitor weighing approximately 8 pounds PAL M and the 1735 dual standard versions can gt be powered from an ac source or with the addition of a field upgrade kit 1700F10 12 Vde The ert occupies approximately two thirds of the front panel area with the control panel taking up the remainder Operation is controlled by a mieroprocessor that polls the front panel switches and remote ground closures Front panel switches are of the momentary touch type with lighted functional indicators Most of the switches are also used to select special functions which are accessed by holding the switches in until the microprocessor recognizes the request The signal is displayed on a bright ert capable of displaying one line per frame It is of the mesh type for better geometry and uses an internal graticule to reduce parallax Variable graticule scale illumination provides even lighting without hot spots or voids over the usable graticule area to improve measurement accuracy and the quality of waveform pictures Composite video signals for the Channel A and B Inputs and the External Reference Signal Input are high impedance bridging loop throughs in order to protect the integrity of the signal paths The input switching allows f
24. 737 C843 and R837 set the position of the pulse and C848 and R849 determine the pulse width 4 6 REV JAN 1987 Vertical Sync Generator Field rate synchronizing information is extracted from composite sync by U947A and U753B and the associated parts U947A is an integrator whose out put is normally low The broad pulses in the vertical interval cause its output to ramp up When the broad pulses end and the serrated pulses begin the output starts ramping back down This negative direction is passed by C853 to comparator U753B which produces a vertical sync pulse VSYNC RGB Amplifier The staircase signal from the REMOTE connector drives an operational amplifier composed of Q856 and Q855 The amplifier is compensated for opti mum step definition by C953 A de level in the staircase can be adjusted out by R856 the RGB Offset adjustment Field iD and Trigger Select Field identification is achieved by a D type flip flop internal to U535 The square wave line rate sync HAFC is the D input which is clocked by vertical sync on the clock input Since there is a one half line offset in the vertical sync between fields verti eal syne will alternately clock a high or low HAFC level enabling the outputs of the flip flop V TRIGGER and FIELD which will be a frame rate square wave high for one field and low for the other The V TRIGGER signal triggers the Field Rate Sweep Generator while FIELD provides field rate timing informat
25. EEP settings are available These sweep rates can be magnified 2 LINE X10 and 2FLD or 1LINE X25 In addition a low ground closure at pin 3 when 2FLD SWEEP is selected provides a 1 Field Sweep Remote Sync Pin 10 of the REMOTE connector is a remote sync input A 30 or 60 25 or 50 Hz for PAL square wave signal with an amplitude of 2 to 5 volts will trigger the 1730 Series 2 FLD Sweep In addition a AN composite sync signal can also be used as a remote syne signal Pin4 when pulled low TTL low or ground enables the Remote Sync triggering Table 2 3 Preset Front Panels FILTER FLAT VERTICAL GAIN VAR Front Panel Control Preset 1 pin 13 Preset2 pin 14 Preset 3 pin 15 Preset 4 pin 12 INPUT Channel FLAT HORIZONTAL FIELD FLD1 FLD 1 ALL FLD 1 SWEEP 2 FLD 2 LINE 1 LINE 2LINE LINE SELECT ON 15 LINE 15 LINE FLAT FLAT REV APR 1987 2 19 s 1730 SERIES INSTALLATION PARTII SERVICE INFORMATION SECTION 3 INSTALLATION Packaging The shipping carton and pads provide protection for the instrument during transit they should be retained in case subseguent shipment becomes necessary Repackaging instructions can be found in SECTION 6 MAINTENANCE of this manual ELECTRICAL INSTALLATION Power Source This instrument is intended to operate from a single phase power source having one of its current carr
26. N EVATINAISSY DNN INdNI a HI 669f DNIIINOI INdNI VHD LGL vo Seil ICH X NZ EJ dd Onn HDH E S69 135440 894 geen d315 phdais GOHA HOY 9cy ALINVIOd INAS SLOWS SEN vos 17741 LI A REV JAN 1987 3 4 REMOTE Connector The rear panel REMOTE connector is a 15 pin D type connector It provides the Remote Control Interface the input connector for RGB signals and the input for Remote Sync Remote functions which provide switching and storing of front panel setups at a remote location are enabled by ground closures TTL lows In addi tion to the four front panel RECALL SETUPs that can be called up remotely there are four additional factory programmed Presets that can only be called up through the REMOTE connector The RGB input provides a stable nine division parade display of RGB or YRGB with an approxi mate 10 volt input Remote sync requires approximately 2 to 5 V input of 25 30 Hz or 50 60 Hz signal to synchronize the 1730 polarity is internal jumper selected see Table 3 1 Pin assignments for the REMOTE connector are shown in Fig 3 4 and Table 3 2 REM SYNC ENB RGB ENB RECALLS TLIN TFLD RGB STAIRCASE OTE PRESETS STORE Sul CND Fig 3 4 Rear view of 1730 Series rear panel showing REMOTE connector pins with their functions 1730 SERIES INSTALLATION Table 3 2 REMOTE Connector Pin Assignments Lett ope Front Panel Preset 1
27. NS NIJA SVH 1N3WIRISNMI 801435 SIHLNIHLIM GZLYAJNID NOISSIING Aen 2499 87 l ATIVNU3LNI XVN SLIVMSE Lg 2e 199 ONIHIHUSNY LSI ONNIHVELSNIDLNON JONIHILSLNG 1V439 WISG NI NA 7 O 3MI04V4O8V7 30 TNNOSU JA 31 uwa 101403 UNOd ASLOLU TINNOSHH O HNYNO INdNIIG A8 gen B f ANOLVYORYI 404 o 70 SOLE EEE 2 7 REV DEC 1987 1730 SERIES OPERATING INSTRUCTIONS BNC Connectors CH A 1 Bridging loop through composite video input compensated for 75 Q This input is selected for display by the front panel INPUT switch CH B 2 Bridging loop through composite video input compensated for 75 Q This input is selected for display by the front panel INPUT switch EXTREF 3 Bridging loop through synchronization input compensated for 75 Q selected as the synchronizing source by the front panel REF switch The input signal may be composite sync black burst or composite video PIX MON 4 A 750 output signal that corresponds to the front panel selected display This signal has bright up in the LINE SELECT mode and is used to drive a picture monitor Multi Pin Connectors REMOTE 5 15 pin D type female connector that provides limited remote control functions such as four factory preset front panel setups store disable and the input connector and enabie for the RGB Y RGB staircase Remote functions are activated by polled ground closure only changes in remote input are responded to allowing the fro
28. ON 11 Variable control that positions the waveform display horizontally DISPLAY FOCUS 12 Adjusts CRT beam for optimum definition SCALE 13 Controls the level of graticule illumination INTENSITY 14 ON ON REV APR 1987 Controls display brightness POWER OFF 15 Turns on and off external power to the 1730 Series A mechanical indicator in the center of the switeh shows the status of the POWER switch LINE SELECT 16 Toggles between ON and OFF Line and field number are displayed on the CRT in 1 Line or 2 Line Sweep rates with a colon as a delimiter for example F1 19 field 1 line 19 In LINE SELECT mode the selected line is displayed in 1 Line Sweep rate the selected line is displayed first in the 2 Line Sweep rate and a bright up is provided to mark the selected line in 2FLD Sweep rate The field from which the line will be displaved can be selected with the FIELD switch For line numbering seguences see Table 2 1 1730 and 1731 or Table 2 2 1735 Table 2 1 Line and Field Select Seguence Color Field 1 Field 2 NTSC 1 263 1 262 1 262 o re pran 15 LINE display is accessed by holding the LINE SELECT ON button until there is recog nition In 2 FLD the 15 lines are intensified in the display In 1 or 2Lin the 15 lines are overlayed and the CRT readout is active giving 1730 SERIES OPERATING INSTRUCTIONS the field and line of the first displayed line plus a small
29. PERATING INSTRUCTIONS These instructions provide information about the front panel controls rear panel connectors graticules and an Operator s Familiarization Checkout Procedure along with measurement discussions FRONT PANELCONTROLS AND INDICATORS The front panel controls and indicators consist of momentary contact push button switches variable controls and backlit switch selections See Fig 2 1 1730 and 1731 or Fig 2 2 1735 for control and indicator locations When Line Select is being used the field and line numbers are displayed on the ert for field rate sweeps a strobe pulse is applied to displays of 2 field rate sweep to identify the selected line There are eight push button switches that have functions that are accessed by holding the switch down for approximately one second These functions are identified by a blue box surrounding the front panel label The DC Restorer switch toggles between FAST and SLOW when pushed and held When exiting a held mode the selection reverts to the top of the list at the touch of the push button with the exception of the REF switch which returns to its previous setting INPUT FILTER 1 Toggles through three positions FLAT LPASS and CHROMA In 2Line or 2 Field Sweep a combination filtering routine consisting of Low Pass and Flat for alternate lines or fields can be accessed by holding the FILTER push button in In the dual filter mode the low pass filtered line or
30. Power Supply down until the housekeeping supply is depleted Once the housekeeping supply is depleted the kick start capacitor charges from the power line and starts another kick start cycle Voltage Snubber R170 L177 CR170 CR266 and C267 form a voltage snubber The voltage spikes on the collector of Q367 4 14 lt Supply positive feedback circuit are limited to around 850 V by this circuit During voltage limiting C267 is charged through CR266 When Q367 is turned on CR170 conducts and C267 discharges through L177 readying it for the next snub cycle HIGH VOLTAGE POWER SUPPLY DIAGRAM amp HV Osc and Error Amp The High Voltage Power Supply is generated bya sine wave oscillator and step up transformer Q134 and T332 are the principal elements of an Arm strong oscillator running at about 25 kHz The Error Amplifier U242 regulates the 100 V out put and keeps the High Voltage Power Supply con stant under varying load conditions by controlling the base current to Q134 through Q237 and Q238 The 100 V output is monitored directly while the High Voltage Power Supply is monitored through a feedback circuit R427 C427 and R143 form the High Voltage Power As the current from the High Voltage Power Supply is increased the voltage to the side of the Error Amplifier C242 increases which reduces the base drive to Q134 the HV Osc This positive feedback com promises the regulation of the 100 V supply to
31. T F K instruction Part No 070 4474 02 Manual Product Group 24 Valuetronics internaticnal Inc 1 800 552 8258 MASTER COPY 1730 SERIES WAVEFORM MONITOR Please Check for CHANGE INFORMATION atthe Rear of This Manual First Printing MAR 1986 Revised APR 1988 Tektronix COMMITTED TO EXCELLENCE 1730 SERIES OPERATOR S SAFETY SUMMARY The general safety information in this part of the summary is for both operating and servicing personnel Specific warnings and cautions will be found throughout the manual where they apply but may not appear in this summary TERMS in This Manual CAUTION statements identify conditions or practices that could result in damage to the equipment or other property WARNING statements identify conditions or practices that could result in personal injury or loss of life As Marked on Equipment CAUTION indicates a personal injury hazard not immediately accessible as one reads the marking or a hazard to property including the equipment itself DANGER indicates a personal injury hazard immediately accessible as one reads the marking SYMBOLS In This Manual This symbol indicates where applicable cautionary or other information is to be found As Marked on Equipment A DANGER High voltage D Protective ground earth terminal A ATTENTION refer to manual Power Source This product is intended to operate from a power module connected to a power source that will not apply m
32. WN buttons until the readout indicates that line 19 of field 1 is being displayed Use the LINE SELECT UP button or DOWN to display line 131 Holding in the UP or DOWN button causes the counter to move faster See Fig 2 12 Push the sweep button and observe the Z FLD Sweep with an intensified line at the mid point of one of the fields See Fig 2 13 Push and hold the LINE SELECT button until the intensified portion of the display increases in width this is the 15 Line mode of LINE SELECT See Fig 2 14 Fig 2 11 Dual filter Low Pass and Flat display with a 2 Line Sweep Hold the FILTER button in until both the FLAT and LPASS front panel indicators are lit The display now consists of two lines the first of which has the chrominance removed and the second is unfiltered See Fig 2 11 Push the FILTER switeh and return to FLAT Fig 2 13 2 Field display with intensified line in the first displayed field Push and hold the SWEEP button until the front panel 1 LINE indicator lights look for a display of one line with a line F1 or F2 131 over 15 readout This is 15 continuous in field 1 or field 2 as indicated by the readout Change Fig 2 12 2Line display with LINE SELECT the field by pushing the FIELD button See on Note readout in upper left corner of Fig 2 15 Turn offthe LINE SELECT graticule REV APR 87 2 13 1730 SERIES OPERATING INSTRUCTIONS Fig 2 14 2 Field display with 15 Line mode
33. arkings near the horizontal center of the graticule on the 0V line sync tip level to assist in measuring syne amplitude The dashed horizontal line at the top of the graticule is equal to 1 234V to indicate peak amplitude of 100 color bars Between the 0 9V and 1 1V lines there are markings at 20 mV intervals The NTSC vertical scale is provided on the right side of the 1735 graticule It extends from 40 IRE to 120 IRE in 10 IRE increments Black level setup is denoted by a dashed line at 7 5 IRE There are 2 IRE and 4 IRE markings near the horizontal cen ter of the graticule on the 40 IRE line sync tip to assist in measuring sync amplitude This scale is designed to be used with the 2 Line or 2 Field Sweep rates Making Measurements To use the PAL vertical scale for measuring the K Factor for line time dis tortion and pulse to bar ratio measurements set the REV APR 1988 signal blanking level at the graticule blanking line 0 3 V and position the leading edge of the bar to the ascending arrow just right of graticule center Check to see if insertion gain is unity H it is not adjust the 1730 Series VAR for exactly 0 7 V of signal amplitude from baseline to middle of the white bar Check to see that the negative going bar transition passes through the descending arrow To measure the K Factor for line time distortion measure the largest deviation of the bar top tilt or rounding within the structure The structure is
34. be operated from a 12 Vde source In order to power this instrument from a de source it is necessary to add a TEKTRONIX 1700F10 Field Upgrade Kit The kit consists of a small etched circuit board rear panel plug and the associated cabling Installation requires only common hand tools a soldering iron and about 30 minutes of labor Once a 1700F10 Field Upgrade Kit has been installed the Waveform Monitor can be operated from a 12 Vde source including a TEKTRONIX BPi Battery Pack or its rated ac mains voltage CABINET SECURING SCREWS 1730 SERIES INSTALLATION 1730 SERIES REMOTE CONNECTOR PIN 1 528A CONNECTOR Fig 3 10 Common parts used to convert from 28 Vde to 0 Vde DC Voltage Level TTL Converter When the 1730 Series Waveform Monitor is substituted for a TEKTRONIX 528 or 528A Waveform Monitor the enable levels must be converted from 28 Vde to 0 Vde This conversion requires only a few common parts See Fig 3 10 1730 SERIES THEORY OF OPERATION SECTION 4 THEORY OF OPERATION The material in this section is subdivided into a general description which is supported by the main block diagram and simplified block diagrams and detailed circuit descriptions that use the schematic diagrams as illustrations A thorough under stand ing of the instrument starts with knowing how the major circuit blocks fit together followed by an understanding of the individual circuit s functions These discuss
35. between Channels Greater than 80 dB of isolation between loop throughs Measured at F between Channel A Channel B and EXTREF Loop Through Isolation PLS MON Frequency Response Terminated in 75 Q 17 13 50 kHz to 6 MHz within 3 of response at 50 kHz l Within 1 with a 140 IRE 1 0 V unit display Differential Gain 50 APL i Differential Phase Within 1 with a 140 IRE 50 APL 1 0 V unit display De Level onOutput 0 5 V or less into 75 Q No input signal load Intensification During line select only Active video of selected lines has a de offset of approx 180 mV Output Impedance a 75Q Nominal Return Loss 750 Atleast 30 dB 50 kHz to With instrument turned on 17 6 MHz Brightup Input to PIX MON Output Gain Ratio 1730 SERIES INTRODUCTION Table 1 2 DC Restoration PERFORMANCE REQUIREMENTS DC Restorer Clamp Time fe we AANE Back Porch o Frequency Response at SLOW 20 or less Attenuation of 60 Hz on input signal 60 Hz FAST 90 or greater 11 4 Blanking Level Shift APL changes from 50 11 i with 10 to 90 APL to either 10 or 90 will Change cause blanking level shift of 1 IRE unit 7 14 mV or less CHARACTERISTIC SUPPLEMENTAL INFORMATION Blanking Level Shift 1 IRE unit 7 14 mV or Due to Presence or less shift from no color Absence of Burst burst to
36. can be stored Ifthe current selection is not the desired setup pushing any front panel button except aRECALL SETUP will cancel the STORE mode If one of the RECALL SETUP switches is pushed while STORE is active the current front panel setup will be stored in the selected RECALL position CAL cannot be stored When a store operation is performed on the 1735 the selected standard 50 Hz 60 Hz or AUTO is stored RECALL SETUP 1 2 3 4 20 Recalls from memory or causes the storage in memory of a 1 2 3 4 front panel setting Hach of tne four switches operates with a memory location and tne STORE push button switeh A special feature in the 1735 allows the operator to use the STORE and RECALL function in the normal manner or to select from three operating modes by holding the RECALL switches The 50 Hz PAL standard of operation is selected by holding the Recall Setup 1 key and 60 Hz is selected with the Recall Setup 2 key AUTO which provides automatic switching between the two standards is selected with the Recall Setup 3 key In non line select modes of operation holding the Recall Setup 4 key will display the status ofthe current standard If 50 Hz or 60 Hz operation has been stored as a setup it will be recalled by pushing a RECALL switch If the AUTO mode of operation is recalied and a change in input signal standard has occurred the 1735 will recall the correct standard after the slight delay associated with
37. ccur If loss of reference occurs the current standard is maintained until reference is restored 1730 SERIES THEORY OF OPERATION FRONT PANEL AND CONTROL CIRCUIT DIAGRAM 6 Circuits on this diagram include the front panel switches controls and indicators In addition the on board power supply regulators for the and 11 8 V supplies appear here Indicators and Switches The front panel LED indicators are arranged in six columns returned to a current source by four returns When a light is lit there is a complete cir cuit from the Light Driver Diagram 5 through the LED and back to the Light Driver Switches com plete a simple matrix that is read by the Micropro cessor to determine the operating mode Z Axis Control U252 is a transistor array with two of the transistors connected as a differential current switch The static output level pin 8 is set by the front panel INTENSITY control using Q243 as a current source The Blanking signal is input to the switch through pin9 When pin9 goes high the current output pin 8 is shut off and the Z Axis Amplifier Dia gram 8 blanks the ert See Fig 4 5 In LINE SELECT mode the intensity setting has to change to brighten up the line or lines This is accomplished by increasing the current through the eurrent source Q243 U239A is an open collector dual comparator that goes low when Line Select Blanking oceurs which allows the full current across R238 and R241 to flo
38. de display A plug jumper determines the polarity of the remote sync for internal triggering NORMAL provides line rate triggering off a NEGATIVE edge and field rate triggering off a POSITIVE edge while INVERTED provides line rate triggering off a POSITIVE edge and field rate triggering offa NEGATIVE edge The output of the Sync Stripper or remote sync drives the Back Porch Generator Vertical Sync Recognition and Horizontal AFC Outputs from the Vertical Sync Recognition and Horizontal AFC are used by the Field ID and Trigger Select to trigger the Sweep Generator If Calibrator is selected the Cal Drive signal from the Microprocessor provides the triggering signal instead The Horizontal AFC output in conjunction with Microprocessor control drives the Line Select whose output provides a pulse that 1 Drives the Z Axis Control to unblank the ert at selected line s 2 Provides a bright up strobe at the selected line s for 2 Field Sweep 3 Provides the Picture Monitor Output bright up strobe 4 Generates the Auxiliary Blanking strobe that is used by a companion 1720 Series for line select The ramp output signal by the Sweep Generator drives the Mag Amplifier which has three gain ranges X1 Un Magnified Sweep X10 1 us div in 2 Line Sweep and X25 to display the full vertical interval in 2 Field Sweep and provide 0 2 ps div in i Line Sweep The Horizontal Positioning offset voltage is input to this amplifie
39. designed to ignore the first and last 1 ns of the bar where short time distortions ringing overshoot undershoot etc occur The solid outer box equals a 4 K Factor while the dashed line inner box equals 2 line time K Factor For signals with a bar half amplitude duration HAD that exceeds 8 us simply measure the bar top in increments by positioning the bar to the left or right from the leading or trail ing edge Note that when the leading and trailing edge is on the appropriate arrow the first or last 1 ps is automatically excluded from the measurement 1730 SERIES OPERATING INSTRUCTIONS Min vu Mia wu a mm mmm AR rem m mm ih mt vn mm pm mmm mm mm mm mmm zm mn Pulse to bar K Factor measurements are made using the solid and short dashed lines to the right of the line time distortion structure These lines are scaled to the following formulas 1 1 and aaoi 1 4K 1 4K Where K 0 02 for 2 K Factor dashed lines K 0 04 for 4 K Factor dashed lines Calibrated 5X Gain increases resolution to 0 4 and 0 8 This scaling is described in detail in CCIR Standard Volume 5 1966 Fig 2 19 Dual standard graticule em oem Amt ai u ma me ame mm a In uam a e ara we ze Make sure that the center of the bar is at 100 IRE when blanking level is at O IRE use VAR to adjust gain if necessary If necessary use the HORIZON TAL POSITION control to place the 2T Pulse over the measurement area and measure
40. e The gain is con trolled by varying the difference between the bases of the two transistor pairs to control signal current to pin 6 or pin 12 Pin 6 drives the Gain Cell Ampli fier pin 12 has R480 as a collector load The front panel GAIN control is connected to pin 10 through U585 an analog switch This switch is closed when Variable has been selected from the front panel R700 is the front panel V CAL control Gain Cell Amplifier The Gain Cell Amplifier is a clamped inverting amplifier used to drive the 2nd DC Restorer and Switchable Gain Amplifier It consists of Q673 Q674 and Q669 with the output at the emitter of Q669 DC Restorer drive is coupled through R474 into the analog switch U277 which is activated by the BACK PORCH signal 2nd DC Restorer U277 pins 6 and 7 are closed during back porch time to charge the hold cap C484 The Error Ampli fier U488 drives the Gain Cell Amplifier through a section of analog switch U585 For Slow Restorer R484 is in the loop compensation however for Fast Restorer R484 is shorted through U277 pins 10 and 11 to speed up the loop time constant The output of the Error Amplifier drives the summing junction of the Gain Cell Amplifier through R676 1730 SERIES THEORY OF OPERATION Switchable Gain Amplifier The Switchable Gain Amplifier consists of Q476 Q477 and Q478 with Q469 as the switching ele ment When the base of Q469 is pulled low through R472 amplifier gai
41. e internal regis ters are loaded from the Microprocessor and clocked by the WR output of the Microprocessor LO Data Latch U532 is the data latch that is VO to the 1730 Series non real time switching and the readout enable ROEN It uses addresses from U527 and is clocked by the WR output from the Microprocessor The ROEN works in conjunction with the Microprocessor Blank Dot output pin 26 to display the data from U325 on the ert Cal Drive U331 divides down the ALE output of the Micro processor to provide Cal Drive U331 is enabled by the CAL from U532 LED Drive The front panel LEDs are driven in six common banks by U407 U305 provides a common current drain that is enabled by U407 Data registers in U407 are written into by the Microprocessor over the eight bit address bus AUTO Standard Determination 1735 Only When AUTO standard swtiching is selected the 1735 microprocessor continuously monitors the field duration of the selected REFerence INT the selected input channel A or B and EXT the external reference The 1735 selects the 60 Hz NTSC mode of operation for field rates greater than 55 Hz and the 50 Hz PAL mode for field rates less than 55 Hz Ifa signal s field rate is very close to 55 Hz the standard selection may be indeterminate and oscillate between 50 and 60 Hz Automatic standard switching is delayed from the signal switching by several video frames to insure that false switching does not o
42. ed for 220 V input E576 is a spark gap that fires and blows the line fuse when 220 V is applied when W476 is installed for 120 V input DS185 along with R192 C192 and R196 are a relaxation oscillator with DS185 flashing whenever line volt age is present Kick Starter When the instrument is first turned on C287 is charged from the rectified power line through R197 When the voltage on the anode of Q293 gets 0 6 V higher than the gate 20 V it saturates and turns on Q290 and the charge on C287 is impressed across _ the base drive and switching transistor to allow the Low Voltage Power Supply to start Once the supply has started the housekeeping winding supplies the REV JAN 1987 1730 SERIES THEORY OF OPERATION base drive through CR357 If the Power Supply does not start Q290 R186 and VR186 force the kick starter to cycle until it does start Q290 diverts Q293 s current so that most of the load consists of VR186 and R186 Once the voltage on C287 falls below about 6 V Q293 s load current falls off to such a small value that it turns off along with Q290 so that C287 can recharge Base Drive and Switching Transistor The Low Voltage Power Supply is of the flyback type Q367 is the main switching transistor with T466 providing the base drive R466 limits the for ward base current used to turn on Q367 C471 charges to 0 6 V with CR566 limiting the charge This hoids the base of Q367 negative when Q367 is
43. en 2 LINE and 2 FLD sweep 1 LINE sweep is accessed by holding the SWEEP push button in until recognition occurs The MAG is automatically turned off if SWEEP is changed MAG 9 Toggles between on and off Operates in conjunction with the SWEEP mode to provide usable sweep rates as follows 2 LINE MAG 1 ps div 2FLD MAG 1 full vertical interval 1LINE MAG 0 2 us div The vertical interval displayed in 2 FLD MAG is the one following the selected field trigger for example if FLD 1 is selected as the trigger the vertical interval displayed is the one between field 1 and field 2 field 2 interval FIELD 10 Toggles between FLD 1 and FLD 2 The ALL mode is accessed in the LINE SELECT mode by holding tne FIELD push button in until the word ALL appears on the CRT readout for 2 Line or i Line Sweep or a bright up strobe appears in both fields for 2 Field Sweep This switch determines which field triggers the Z FLD Sweep The selected field trigger is the first left field displaved For example selecting Field 2 trigger places field 2 on the left followed by field 1 In LINE SELECT the indicator lights go off but triggering of the 2 Field Sweep continues on the selected field A line strobe identifies the selected line In 1 LINE or 2 LINE the FIELD button determines the field from which the selected line is displayed field 1 field 2 or ALL fields When exiting ALL fields switching defaults to FLD 1 POSITI
44. ensation adjustment See Fig 3 3 3 for their locations Procedure for setting RGB Offset Each time the camera input to the 1730 Series is changed the RGB Offset will probably have to be reset The following 4 procedure provides a simple means to retweak this adjustment 1 Display any standard television waveform do 5 not have the rear panel RGB Enable set low REV APR 1987 1 2 2 3 1 2 2 3 1 2 2 3 J504 50 60 Hz 1 2 2 3 4635 Remote Sync Polarity 1 2 2 3 ac coupled factory preset de coupled ac coupled factory preset de coupled RGB 3 step parade display factory preset YRGB 4 step parade display 50 Hz line rate factory set for 1731 PAL 60 Hz line rate factory set for 1730 and 1731 PAL M Positive sync polarity factory preset f Negative sync polarity Set the 1730 Series HORIZONTAL POSITION control so that the display is aligned with the graticule Activate the RGB Enable apply the camera staircase output to the RGB Staircase input and apply the camera s video output to the 1730 Series INPUT CH A or CH B ADJUST R856 to center the RGB or YRGB signal on the 1730 Series graticule See Fig 3 3 for the location of R856 ADJUST C953 for the best looking display on the 1730 Series 1730 SERIES INSTALLATION OPIS 4J9 SH UO STJUSUMIJSUI ay UY SIUSUISN PE goy pue s adumf nid jo monggo g g ZIA GYVOB NIYI
45. er and Calibrator circuits input Amplifiers The rear panel Channel A and B inputs are two high impedance loop throughs compensated for 750 Each amplifier has a DC Restorer that is turned off or on by the front panel REST switch The restorers are turned on and off together The two input ampli fiers are identical so specific information is only given for CH A The CH A Input Amplifier is an inverting feedback operational amplifier with a gain of 1 R196 15k is the input resistor and R198 15 k is the feedback resistor J197 is factory set to the 1 2 position to ac couple the input It can be moved to the 2 3 position for de coupling this bypasses C197 the ac coupling capacitor The DC Restorer is a feedback sample and hold circuit The sampling occurs when one section pins 2 and 3 of U395 an analog switch closes at back porch time and the hold cap C398 charges If REST is selected another segment of U395 pins 14 and 15 is closed and the Buffer Amplifier U495A which is loop compensated drives the summing junetion through R197 This restorer has a time constant that will not attenuate 50 60 Hz hum more that 10 with the restorer turned on The choice of FAST or SLOW time constant is made with another restorer that is shown on Diagram 2 4 3 1730 SERIES THEORY OF OPERATION Channel Switch The output signals from the CH A or CH B Input Amplifiers are input to the channel switch U492 through pins 2 and
46. es completely through the blanking line There are three on the graticule See Fig 2 82 Check that the falling transition of the 10th square wave passes directly through the right side timing mark The H CAL can be adjusted if timing is off Push the MAG button and check for one cycle of square wave over the 10 divisions of timing area See Fig 2 8b Hold the SWEEP button until the 1 LINE front panel indicator lights Check for five full cycles over the 10 division timing area See Fig 2 8c Fig 2 8 Checking timing with the internal calibrator signal a 2Line display b 2 Line Push the Waveform Monitor REF switch and display magnified c 1 Line display return to INT REV APR 87 2 11 1730 SERIES OPERATING INSTRUCTIONS 10 2 12 Gain Control The normal GAIN setting with the GAIN switch off is 1 V full scale with neither the X5 nor the VAR indicator lit The GAIN VAR control changes the amplifier gain so that signals greater or lesser in amplitude to the calibrated 1 volt full scale can be displayed as full scale Push the GAIN switch and note that the VAR indicator is lit Also note the range of amplitude signal amplitude greater than the scale at one extreme and considerably smaller at the other that is obtained with the control Push the button and check that the X5 indicator lights Check for a large increase in gain lt can be determined that this is a X5 gain increase by setting the sig
47. fer the 1730 Series Waveform Monitor to qualified service personnel for repair or adjustment When a complete check of the instrument performance to its specification is desired refer to the Performance Check which should only be performed by qualified service personnel in SECTION 5 of this manual 2 8 REV APR 1987 1730 SERIES Rear View EXT CHA CHB REF k LINEARITY SIGNAL 1410 SERIE X Rear View Fig 2 4 Equipment connections for the 1730 Series Operator s Checkout Procedure This procedure reguires a source of composite video The TEKTRONIX 1410 Series Television Test Signal Generator 1410 for NTSC 1411 for PAL or 1412 for PAL M with Sync Color Bar and Linearity modules was used in preparing this procedure Procedure This procedure reguires only one hook up to perform Fig 2 4 shows the reguired connections Once the signals are connected continue on to step 1 of the procedure 1 Initial Generator Setup Video Signal Generator Test Signals Full Field Color Bars 75 Ampl 7 5 Setup NTSC and PAL M 75 Ampl 0 Setup PAL Modulated Staircase Flat Field 5 Step REV APR 1987 1730 SERIES OPERATING INSTRUCTIONS Apply Power Connect the instrument to a suitable ac power source and push tne POWER button A center dot should appear in the eye of the POWER switch to indicate that it is on NOTE Do not set any of the front panel screwdriver controls until after the
48. field will always be on the left in 2 Line or 2 Field Sweeps Lines are overlapped in 1 Line Sweep The dual filter can not be accessed when 1730 Series is in AB switching or LINE SELECT mode Filtering always returns to FLAT when coming out of the combination filtering routine If AB switching or LINE SELECT is selected after the dual filter mode filtering will be Low Pass REF 2 Toggles between internal and external reference Calibrator is accessed by holding the REF switch Instrument status is held in memory when CAL is selected and restored when the push button is again pushed All front panel lights except SWEEP and MAG go out and GAIN goes to X1 but X5 and VAR are usable with the CAL position CAL cannot be STOREd or RECALLed Note that MAG and SWEEP are switchable in the Calibrator mode but revert to their previous setting when the mode is exited CH A CH B 3 Switch that toggles between Channel A and Channel B input When held the 1730 Series goes into an AB BOTH alternate mode with the A input on the left and the B input on the right in 2 Line or 2 Field overlapped in 1 Line When in the AB switching mode the REF is forced to EXT the FILTER is forced to LPASS if it was in the LPASS FLAT switching mode if not the FILTER remains in the previous position and the DC REST goes to SLOW all three functions go back to their previous setting when input is switched out of AB The DC Restorer can be changed after en
49. for those instruments that are operated from a battery supply The 1730 Series was tested for compliance in a cabinet To ensure continued compliance the instrument will need to be enclosed in a cabinet that is equivalent to the Factory Upgrade Kits that are listed as Optional Accessories for the 1730 Series A drawing of the 1700F00 plain cabinet is contained in the Installation Instructions SECTION 3 1730 SERIES INTRODUCTION The 1730 Series is designed and tested in accor dance with the following industry safety standards UL1244 1980 Standard for Electrical and Electronic Measuring and Testing Equipment FM 3820 Approval Standard for Electrical Utilization Equipment Class Number 3820 ANSI C39 5 Safety Reguirements for Electri cal and Electronic Measuring and Controlling Instrumentation 1974 CSA Electrical Bulletin No 556B IEC 348 Second Edition Safety Standard for Electronic Measuring Apparatus VDE 0871 5 Class B Radio Frequency Interference Suppression of Electrical Equipment and Systems 1730 SERIES INTRODUCTION ELECTRICAL SPECIFICATION Table 1 1 Vertical Deflection System PERFORMANCE REQUIREMENTS SUPPLEMENTAL INFORMATION CHARACTERISTIC Frequency Response 1 V Full Scale or in X Gain FLAT X1 50 kHz to 6 MHz within Specifications apply for full screen 2 of response at 50 kHz height video input signal with variab
50. gh internal sync is selected In either case the signal current from Q798 or Q792 is directed into common base stage Q799 and is developed across R797 2 k When this signal current is 0 5 mA there will be 1 V of video from either the internal or external sync source driving the Sync Stripper through C998 and R993 Sync Stripper The Sync Stripper which consists of Q992 and U892 processes the sync source signal and regenerates COMP SYNC to control the timing circuitry The 4 4 Syne Stripper input is from Q799 through C998 and R993 into the base of Q992 a summing junction Q992 and one section of U892 pins 7 8 and 9 form an operational amplifier that clips syne near the sync tip and inverts it Gain resistors R R993 and R R992 provide high gain to the syne tip portion of the signal but clip anything slightly above the syne tip level During sync time the clamp circuit U892 1 2 3 and U892 13 14 15 maintains the output of the first amplifier stage at about 5 V This output feeds back to the clamp circuit to maintain the proper level During non sync times active video diodes CR988 and CR989 are both on shunting U892C This greatly reduces the gain during active video time and limits the saturation of U892C so that it can react quickly to the next sync transition The second amplifier is U892B an inverting ampli fier It provides the negative going sync and cleans up any remaining noise or video on
51. ibrator signal Press and hold the REF button until the CAL indicator LED is lit Adjust the VERTICAL and HORIZONTAL POSITION controls to obtain a display similar to that shown in Fig 2 6 If necessary adjust the V CAL screwdriver control for 1 V amplitude 140 IRE Switch REF to INT mode Turn CAL off by again pushing the REF button EASON GA Fig 2 6 Checking Vertical Gain Calibration with the 1730 Series internal CAL Reference Select Input The AB switch selects the rear panel Channel A or Channel B inputs Position the color bar waveform so that the blanking level is at the 40 IRE 0 V graticule line and the sync pulses are at each end of the graticule Select the Channel B input Note that the linearity waveform is displayed 1730 SERIES OPERATING INSTRUCTIONS Push and hold the INPUT button until both the color bar and linearity waveforms are displayed See Fig 2 7 Check that both the CH A and CH B front panel indicators are on Fig 2 7 Dual channel 2 Line display of color bar and linearity signals Push the switch to return to the Channel A color bar display 8 Select Timing Reference Be sure that SWEEP is still 2 LINE Hold the REF button until the CAL signal appears Position it so the top of the display is on the 70 IRE NTSC AND PAL M or 0 7 V PAL EE T Horizontally position the display so the first ae transition is on the left side timing mark the SEEN SA mark that go
52. ifiers are shunted by sample and hold type clamps that are timed by a Back Porch Sample from the Back Porch Generator Switching at the output of the amplifiers provides for display of either signal or a combination of both in all sweep modes In the combination mode the Channel A signal is displayed on the left of the CRT with the Channel B following This clamped signal prior to any filter ing is also the rear panel Picture Monitor Output In LINE SELECT modes a strobe that acts as a bright up pulse is added to the Picture Monitor Out put to identify the selected line or block of lines in 15 Line Front panel switching selects a Flat unfiltered Low Pass or Chroma filtered signal for display Low pass filtering can be used with Flat as part of a dual filter mode for all sweep modes In the dual filter mode the low passed signal is displayed to the left with the unfiltered flat signal following When the calibrator signal is selected from the front panel switching a 1 volt 100 kHz signal is applied to the input of the Gain Cell instead of input video The calibrator signal is used to set up both Vertical Gain Volts Full Scale or Horizontal Gain Sweep rate from a self contained source Signal amplitude can be adjusted at the Gain Cell using either the front panel VGAIN or VARIABLE gain control The output signal from the Gain Cell drives another clamped amplifier This second clamped amplifier has a loop compensated
53. ion equals 1 ps In 1 Line Sweep each major division is equal to 5 ps and when magnified X25 each major division equals 0 2 ps In 2 Field Sweep the timing scale ts of no real value since this is a monitoring mode how ever when 2Field Sweep is magnified X25 the entire vertical field interval can be displayed PAL Graticule Vertical Scales The PAL graticule scales are from 0 to 1 2 V on the left side See Fig 2 18 The right side has markings at sync tip 0 3 V baseline 0 V and peak white 0 7V There are 2 and 4 markings at the horizontal center of the graticule on the 0V line sync tip level to assist in measuring syne ampli tude The dashed horizontal line at the top of the graticule is equal to 1 234 V to indicate peak ampli tude of 100 color bars The boxed area slightly to the left of center at the 1 0 V level is scaled for 2 and 4 K Factor ratings for precise tilt measurements This structure is designed to work with an 8 ps half amplitude dura tion HAD bar The short dashed lines to the right of the Bar tilt measurement structure are used to measure pulse to bar ratio they are weighted for 2 and 4 K Factor ratings REV APR 1988 1730 SERIES OPERATING INSTRUCTIONS ENEE Tek 2 amp 4 KFACTOR PAL Fig 2 18 PAL graticule Dual Graticule Vertical Scales The PAL vertical scale from 0V to 1 2V is provided on the left side of the 1735 graticule See Fig 2 19 There are 2 and 4 m
54. ion to the Microprocessor In RGB and Remote Sync modes no field identification occurs Non standard syne inputs may cause the field identifying circuit to stop producing a field rate trig ger signal for the Sweep Generator When this hap pens VSYNC is automatically used for triggering without any field identification taking place R907 and C907 in conjunction with Q806 and C906 detect the absence of field identified vertical sync The field rate square wave FIELD keeps C906 charged and the input to pin 19 high when there is field identification 1730 SERIES THEORY OF OPERATION A one field trigger is accommodated with the remote 1LIN 1FLD input by turning on Q821 which shuts off Q806 and allows C906 to discharge The result ing low at U535 19 switches the VSYNC pulse to U535 14 for triggering of the Sweep Generator at a field rate V TRIG is the field rate trigger signal going to the Sweep Generator A positive edge will trigger the Sweep Generator FLD 1 or FLD 2 sweep triggering is selected by the FIELD1 FIELD2 control line from the processor U535 also provides the logic for selecting either the applied sync or the Calibrator for line rate syne H TRIG Displaying the appropriate lines in the LINE SELECT mode is achieved by blanking the ert beam the rest of the time A LIN SEL signal from the Microprocessor is used by U735 to generate LINSTRB the blanking signal and PIXSTRB the strobe signal on the Picture
55. ions of the 1730 Series Waveform Monitor begin with a brief fundamental overview then proceed on to the block diagram and then go into individual circuit descriptions Overview The 1730 Series is a specialized oscilloscope designed to monitor and measure television base band signals Signals input through either of the rear panel 75 Q bridging loop through inputs are displayed on the crt In addition an alpha numeric line and field readout is provided on the ert for use with the LINE SELECT mode of operation Front panel mode switching is accomplished by a series of push button switches whose status is being constantly polled by a Microprocessor In turn the Microprocessor controls switching functions and cir cuit gains so that the instrument can perform as a monitor or be used to make specific measurements The Microprocessor is an 8051 type See Fig 4 1 The Low Voltage Power Supply is a high efficiency switching type The High Voltage Power Supply provides 13 kV acceleration potential Block Diagram The main block diagram for the 1730 Series Wave form Monitor is located on a pullout diagram in SECTION 9 of this manual The following func tional description uses this diagram as its illustra tion The numbers on the circuit blocks correspond to the schematic diagram for that circuit Circuit Blocks Vertical Color encoded video signals are input through the bridging Channel A and Channel B inputs The input ampl
56. keep the high voltage constant with varying intensities C138 and Q137 are a start delay circuit that holds the Error Amplifier output low through CR138 until C138 is charged from the 15 V supply Delay ing the start of the high voltage oscillator allows the Low Voltage Power Supply to start un encumbered by the load from the high voltage oscillator Power Supply Outputs CR222 is the high voltage rectifier Smoothing capacitors C217 and C218 work with CR222 to pro vide 2750 volts to the ert cathode U226 is a four times multiplier providing 11 kV to the ert anode REVJAN 1987 Focus Amplifier Q413 and Q313 form an operational amplifier that sets the voltage at the bottom of the focus divider The front panel focus pot determines the voltage at the bottom of the focus divider The CTR Focus con trol R213 is set for optimum beam focus as viewed on the ert with the front panel FOCUS control set to mid range Once the CTR Focus adjustment has been set adjusting the front panel FOCUS control changes the voltage at the bottom end of the divider and conseguently the voltage on the crt focus anode Grid Drive Circuit The grid and the cathode ofthe CRT are at a 2750 V potential with the grid effectively de coupled to the Z Axis Amplifier by the grid drive circuit The unrectified 25 kHz sine wave output from the 100 V supply winding is input to a modulating circuit where it is clipped and rectified for use as ert con
57. le GAIN off raren 150kHzto 6 MHz within 12 5 of response at 50 kHz LOW PASS At least 30 dB Response at 15 kHz does not vary 16 d attenuation at 3 58 MHz between FLAT and LPASS by more 1730 4 00 MHz 1735 than 1 4 43 MHz 1731 CHROMA NTSC and Nominal Bandwidth Upper and lower 3dB points are PAL M 1 MHz Attenuation at approximately 350 kHz from 7 2 MHz 20 dB or 3 579545 MHz greater Response at 3 58 MHz does not vary between FLAT and CHROMA by more than 1 Nominal Bandwidth Upper and lower 3dB points are 1 MHz Attenuation at approximately 350 kHz from 8 9 MHz 20 dB or 4 433619 MHz greater Response at 4 43 MHz does not vary between FLAT and CHROMA by more than 1 Transient Response 1 V Full Scale or X5 Specifications apply for full screen Gain height video input signal with FLAT using 2T variable GAIN off pulse and 2T bar Preshoot 1 or less 1 4 REV APR 87 1730 SERIES INTRODUCTION Table 1 1 cont PERFORMANCE CHARACTERISTIC REQUIREMENTS X1 0 99 1 to 1 01 1 Pulse to Bar Ratio X5 0 98 1 to 1 02 1 Overshoot X1 2 or less X5 4 or less Ringing X1 2 or less X5 4 or less Tilt Field Rate 1 or less Sguare Wave or Vertical Window Oversean Less than 2 variation in baseline of 100 IRE Differential Gain 700 mV 12 5T 20T modulated pulse as itis positioned over the middle 80 of the screen
58. le to select either the 3 step or 4 step parade to accommodate RGB or YRGB dis plays With the exception of the 50 60 Hz jumper the factory preset position is indicated by a box printed on the etched circuit board Table 3 1 details these internal jumper selections Be sure that all operators are aware of changes to prevent unneces sary trouble reports if any of these jumpers are placed in the optional position See Fig 3 3 for loca tion of the internal plug jumpers REV SEP 1987 3 1 1730 SERIES INSTALLATION DC INPUT 1170 13V PIX MON 2 a 35 WATTS MAX ee INTERNALLY SETFOR LINE SEL VOLTAGE tov 90 1320 AUXILIARY CONTROL OUT 5 1 CAUTION FOR CONTINUED FIRE PROTECTION REPLACE FUSE ONLY WITH 250V 2A F TYPE TO AVOID ELECTRICAL SHOCK THE POWER POSITION OF SCREW INDICATES WHICH VOLTAGE THE INSTRUMENT IS SELECTED Fig 3 1 Rear panel line selector indicating instrument is set for 120 V mains REAR PANEL WIRE STRAP ROOD YK MODI TIEN LMA AA RAISE RIM III PINYIN DAP LTERER VI VA My d PART OF Ai POWER SUPPLY BOARD Fig 3 2 Strap across J476 sets mains voltage to 120 V 3 2 REV SEP 1987 Table 3 1 1730 SERIES INSTALLATION internal Jumper Selection CH A Input Coupling i J699 CH B Input Coupling M RGB OFFSET and COMPENSATION d Television cameras vary in output de level R856 is provided to compensate for this variation in de level C953 is the comp
59. ments of key parameters including various vectorscope measurements In addition to the VCR bridge and the typical Master Control monitoring applications this monitor can be used in camera chains It has a choice of RGB or YRGB Parade display that can easily be selected by changing one internal plug jumper setting The Parade signal and enable are input through the rear panel REMOTE connector A number of operating conditions can be altered by changing internal plug jumpers using some of the factory preset combinations or setting up and saving the front panel with the Store Recall function Using these methods most of the current 528A operational mods can be accommodated There is a difference in how the remote contro operates the 1730 Series uses ground closures not positive voltage as the 528A did OPTIONS The only options currently available for the 1730 Series Waveform Monitor are the power plug options Al through A3 All 1730 NTSC and 1731 PAL M Waveform Monitors are shipped with a 115 Vac power plug and a captive cord CSA certification applies to the product with CSA certified power cords International power cords Options Ai A2 and A3 which are approved for the country of use are not included Ail 1731 PAL and 1735 Waveform Monitors are shipped with one of the following power plug options Option Al Universal Europe 220V 16A Power Plug Option A2 United Kingdom 240V 15A Power Plug Option A3 Australian 240V
60. n is minus one R is R475 and R is the sum of R367 and R368 When its base is high Q469 saturates and grounds the collector end of R470 to put an attenuator in the feedback path to increase gain by a factor of five The output at the collector of Q476 drives a limiter comprised of CR280 and CR380 Vertical Output Amplifier SN 8020000 amp Up R374 R377 and R378 form a level shift network which terminates the bridge limiter and provides the correct de bias for the output stage The level shifter signal is applied to the base of Q383 through the switch at pins 14 and 15 of U277 This signal is disconnected while the Line Select readout is dis played and Q383 receives the Y Axis signa through pins 2 and 3 of U277 This provides the vertical com ponent of the readout deflection Q382 and Q383 form a shunt feedback amplifier Q382 amplifies and inverts the collector current of Q383 providing most of the signal current through R485 Since Q382 provides a nearly constant cur rent in Q383 the input signal voltage is applied across its emitter resistor R485 with very little dis tortion The negative feedback improves linearity and reduces thermal distortions introduced by Q383 and increases its input impedance The series con nection R384 and C384 provides bandwidth and stability compensation Q385 and Q387 form an identical shunt feedback amplifier with signal current input through R485 Due to the feedback in this stage
61. nal base line on the graticule OIRE NTSC and PAL M or 300 mV PAL and checking that the maximum excursion of color burst is at approximately the 100 IRE or 1 V graticule line Push the button in and hold it until both the VAR and X5 indicators are lit Rotate the GAIN control and look for a greater than 5X amplitude display at one extreme and a nearly normal amplitude display at the other extreme Push the GAIN button once and notice that the display amplitude returns to 1 V Full Scale Filter Selection The FILTER button selects the freguency response characteristic for the displayed signal The FLAT response is used for normal applications Fig 2 5 shows the color bar signal with the FLAT response Press and hold the FILTER button to get the front panel LPASS indicator to light This provides the low pass freguency response the chrominance component of the signal has been removed See Fig 2 9 REV APR B7 Fig 2 9 2 Line display of color bar signal with Low Pass filter on Press the FILTER button once more and look to see that the CHROMA indicator is lit The signal is now displayed as chrominance only the luminance component is removed See Fig 2 10 o r re o Ve rr pas o sk tint ona env r SE ee Fig 2 10 Z Line display of color bar signal with Chroma filter on 1730 SERIES OPERATING INSTRUCTIONS 11 Sweep Speeds and Line Select Turn on LINE SELECT and push and hold both the UP and DO
62. nt panel to be fuliy operational AUXILIARY 6 A 9 pin D type female connector to interface with the 1720 Series Auxiliary control consists of a signal line and an interface bus The bus provides the 1730 Series with control of the status of the 1720 Series Power Input AC FUSE 7 Holder for the instrument s mains fuse AC POWER 8 A standard ac plug receptacle for 120 or 240 Vac power mains Plug is compatible with any of the three power cord options available for the 1730 Series Waveform Monitor DC INPUT 9 A knockout for installation of a 1700F10 Field Upgrade Kit de power plug LINE SEL SETTING 10 A screw mounted to denote the placement of an internal soldered in strap OPERATOR S CHECKOUT PROCEDURE The following procedure is provided as an aid in obtaining a display on the 1730 Series Waveform Monitor operator familiarization and as a quick check of basic instrument operation Only instrument functions not measurement quantities or specifications are checked in this procedure Therefore a minimum amount of test equipment is required All checks are made with the cabinet on and all internal jumpers in the factory set position Display photographs shown in this procedure were taken with the 1730 Series If performing the Operator s Checkout Procedure reveals improper operation or instrument malfunction first check the operation of associated equipment If associated equipment is performing normally re
63. o change from 3 step to 4 step capability Factory set to 3 step 12 V p p ac component Signal voltage not to exceed 12 Vde plus peak ac Internal adjustment offsets any incoming signal de component between Z12V Input Impedance 1 MQ shunted by approx 3 pF Field or line rate if enabled from the REMOTE connector RGB YRGB mode and Parade Overlay selected by applying ground TTL low at the RGB Enable pin on the rear panel REMOTE connector RGB components may be overlayed with normal sweep length by not activating RGB Enable Field or line rate sweeps A 1 EFLD sweep is selected by grounding the 1 FLD 1 LINE pin of the rear panel Remote connector 1730 SERIES INTRODUCTION Table 1 7 CRT Display PERFORMANCE REQUIREMENTS Accelerating Potential Fe Nominally 13 75 kV AO Trace Rotation Range Greater than 1 from Total adjustment range is typically W bai CHARACTERISTIC SUPPLEMENTAL INFORMATION SO X 100 mr Horizontal A 5 div Vertical 170 RE units 1 19 V horizontal 8 Graticule SG Internal variabie illumination Table 1 8 Power Source PERFORMANCE REQUIREMENTS CHARACTERISTIC SUPPLEMENTAL INFORMATION Mains Voltage Ranges 120 V 90 132 V 220 V 180 250 V Power Consumption 35 Watts maximum Optional Battery 1700F10 Field Upgrade Kit can be Operation installed for de operation 1 12 REV SEP 1987
64. of LINE SELECT on Fig 2 15 A 1 Line Sweep rate with 15 continuous lines from mid field displaved using LINE SELECT 12 Horizontal Magnifier Select the 2H SWEEP and center the horizontal sync on the screen Press the MAG button and note the magnification of the horizontal syne details Push SWEEP for 2FLD and MAG for X25 and note that the 2 14 vertical interval is displayed See Fig 2 16 Note that the MAG button works with any SWEEP selection Push the MAG button to turn offthe MAG Fig 2 16 Display of vertical interval with magnified 2 Field Sweep 13 Recall Setup Set the 1730 Series for both CH A and CH B input SWEEP to 1 LINE MAG on and VERTICAL GAIN to X5 Note front panel indicators Push the RECALL SETUP 1 button and note that the front panel setup changes NOTE The STORE function could also be checked however operating settings may be stored in tke memory location and they would be overwritten with the new front panel information For more information on how to use the STORE function see CONTROLS and CONNECTORS in this section ofthe manual GRATICULES There are three basic graticule patterns available for the 1730 Series All three are internal with edge illumination The graticule used by both the 1730 and the 1731 PAL M is a 525 line 60 Hz NTSC Composite scale The 1731 PAL has the CCIR 625 line 50 Hz graticule for the PAL color standard The 1735 has a dual graticule
65. off T466 is polarized so that when 9463 is on Q367 is driven on To efficiently turn Q367 off base current must be drawn backwards from the base This reverse base current is derived from magnetizing current stored in T466 and stabilized by Q363 and Q362 The resulting reverse base current in Q367 is at a rela tively constant value VR465 limits voltage spikes on Q463 to 30 V For troubleshooting purposes The forward base current is about 130 mA and the reverse base cur rent should vary between 70 mA and 130 mA depending on line voltage and load current Pulse Width Modulator and Error Amplifier The Pulse Width Modulator uses U558 for pulse width control C557 and R557 set the operating fre quency to about 30 kHz Pin 15 is the power input pin 16 supplies a 5V reference and pin 10 is the shutdown When pin 10 is pulled high U558 is shut off it is driven by the Current Limit Pin 12 is the output which controls the base driver As the voltage on pin 9 is varied the duty cycle as seen at pin 12 changes from 0 to 50 The duty cycle changes with line voltage and load changes in order to keep the output voltage constant One volt or less on pin 9 produces a 0 duty cycle 4 13 1730 SERIES THEORY OF OPERATION In order to isolate the load from the power line all supplies are derived from the secondary ofthe power transformer The control voltage fed back to the Pulse Width Modulator from the Error Amplifier is
66. or the display of either Channel A or Channel B Input or both inputs Synchronization can be either internal or external with the further choice of using remote sync where the application warrants The 1730 Series offers a choice of three basic sweep rates 2 Field 2 Line and 1 Line each of which can be magnified to provide three additional sweep rates 1 ps 2 Line 0 2 ps 1 Line and X25 for the 2 Field which provides for viewing the complete vertical interval In addition there is full frame line The 1730 System M NTSC and the 1731 System I B ete PAL selection that can be displayed as 1 line lines or 15 lines A bright up pulse for Picture Monitors that corresponds to the intensified region on the crt display is available through a rear panel bne connector The vertical signal processing provides a choice of dc restoration fast or slow or an unclamped display The input signal can be unfiltered Flat or either Low Pass or Chrominance filtered When Low Pass filtering is selected and either a 2 Line or 2 Field sweep rate is employed the display consists of one line or field Low Pass filtered while the second is unfiltered Vertical amplitudes can be displayed in a calibrated gain mode which corresponds directiy with the graticule vertical scales magnified 5 times or can be set to a specific amplitude by using the Variable An RGB or YRGB Parade display for camera setup is accommodated with a shor
67. ore Recall data is saved in a matter of milli seconds when the power starts to drop below safe operating levels for the NOVRAM U727 is a three terminal regulator operating from the 15 V supply that comes onto the circuit board from the Power Supply circuit board As soon as the 15V raises enough to provide a 5 V output from U727 U725 recalls the data saved so that it will be available to the Microprocessor when all supplies are up to their operating tolerances U731 is a buffer for remote input that is enabled by pin 17 ofthe Microprocessor Switch Control U884 is a serial in parallel out register that is loaded with the real time switching data from the Microprocessor serial port pin 10 whenever U522 pin 24 is high When U522 pin 24 is high it enables the U884 serial input and disables the external communications input through U809B The eight bits of serial data are then clocked out in parallel by the leading edge of H line Sync which clocks pin 12 of U884 Address Demux U527 1s the Address De Multiplexer used to decode the lower eight bits ofthe address line Even though both addresses and data share the same Micropro cessor port only addresses are present when U527 is clocked from the Microprocessor ALE output REV APR 1987 1730 SERIES THEORY OF OPERATION Readout Drive U325 and U231 A and B drive the X and Y axes of the dot scanned line select readout on the CRT U325 is a dual D A Converter whos
68. ore than 250 volts rms between the supply conductors or between either supply conductor and ground A protective ground connection by way of the grounding conductor in the power cord is essential for safe operation Ground the Product This produet is grounded through the grounding conductor of the power module power cord To avoid electrical shock plug the power cord irto a properly wired receptacle before connecting t the product input or output terminals A protective ground connection by way ofthe grounding conductor in the power module power cord is essential for safe operation Danger Arising From Loss of Ground Upon loss of the protective ground connection all accessible conductive parts including knobs and eontrols that may appear to be insulating can render an electric shock Use the Proper Fuse To avoid fire hazard use only the fuse of correct type voltage rating and current rating as specified _ inthe parts list for your product Refer fuse replacement to qualified service personnel Do Not Operate in Explosive Atmospheres To avoid explosion do not operate this product in an explosive atmosphere unless it has been specifically certified for such operation Do Not Operate Without Covers To avoid personal injury do not remove the product covers or panels Do not operate the product without the covers and panels properly installed 1730 SERIES 1
69. output level by U263B a comparator Whenever the output of U 263A is higher than the level from the front panel SCALE control Q158 is turned on and current is drawn through the bulbs DS404 and D 3804 through Q158 to ground The duty cycle of Q158 is determined by the level set by the SCALE control REV APR 1987 Post Regulators The and 15V supplies generated on the Power Supply cireuit board are further regulated to meet the on board needs of the 1730 Series Main A 3 cir cuit board U164 and U172 are the post regulators for the 11 8V and 11 8 V supplies R167 is the 11 8 V Adjust and R168 is the 11 8 V Adjust LOW VOLTAGE POWER SUPPLY DIAGRAM 7 The Low Voltage Power Supply converts the mains line voltage either 120 or 220 volts to supply the in strumen s circuits The voltage supplied to operat ing circuits are 40 V 5 V 15 V and 15 V Line Rectifier and Filter The input line voltage is filtered to prevent any noise that is on the ac line from interfering with instrument performance and to prevent any noise generated within the waveform monitor from get ting back to the ac line RT484 and RT582 are surge protection to limit initial turn on current through the rectifier and capacitors The rectifier operates as a full wave bridge for 220 V input or as a full wave doubler for 120 V input Operating voltage is selected by the position of W476 which is soldered in place for 120 V input and remov
70. presence of color burst Tabie 1 3 Calibrator PERFORMANCE REQUIREMENTS CHARACTERISTIC SUPPLEMENTAL INFORMATION Calibrator Signal Frequeney 100 kHz 100 Hz Crystal controlled Timing accuracy Synchronizes in 2H and is10 us 0 01 ps Can be used as 1H sweep 10 us and 1 us timing calibrator Amplitude 140 IRE 1 V within 1 p en een 8 d Top of waveform must be between 80 IRE 0 86 V and 120 IRE 1 14 V on graticule when Back Porch is positioned to 0 TRE 0 300 V line with DC RESTORER on 1730 SERIES INTRODUCTION Table 1 4 Horizontal Deflection System PERFORMANCE REQUIREMENTS SUPPLEMENTAL INFORMATION CHARACTERISTIC Sweep will occur in all Horizontal mode settings with or without synchronization 2 FLD Sweep Equal to frame rate of Repetition Rate ee video or external sync i 2FLD Sweep Approximately X25 Magnification 1 LINE Sweep Equal to line rate of Repetition Rate applied video or external sync l 2 LINE Sweep Egual to half line rate of Repetition Rate applied video or external sync Sweep Length 2 LINE and 2 FLD sweep length is nominally 12 5 divisions Timing Accuracy 1 us div To within 2 All timing and linearity 0 2 ps div To within 3 specifications exclude the first and last major divisions of the unmagnified display Timing can be adjusted 5 with front panel H CAL i Linearity 1 ps div amp 0 2 ps di
71. r guaranteeing suffi cient range to position any part of the display onto the graticule When the RGB Parade display is enabled the sweep is shortened and is offset by the RGB Staircase input signal to produce three short ramps that are dis lt played in sequence as a normal sized sweep The output of the Mag Amplifier and the X compo nent of the Readout from the Microprocessor drive the Horizontal Output Amplifier which matches impedances and normalizes gain approximately 100 V for a 10 cm sweep length to drive the CRT horizontal deflection plates CRT Unblanking and High Voltage The blanking signal from Line Select and the Intensity and Readout voltages are used by the Z Axis Control to unblank the ert during sweep time when sweep is magnified the off screen por tion of the sweep is blanked to increase contrast ratio The Focus Amplifier controlled by the front panel control provides a voltage to the ert focus ring 1730 SERIES THEORY OF OPERATION Trace Rotation provides compensation for the mag netic field surrounding the ert The crt is of the Post Acceleration type which requires a relatively high potential difference between the cathode and post anode The boost in 2nd anode voltage is provided by an encapsulated 4X Multiplier DIAGRAM 1 VERTICAL INPUT This diagram contains the input channels external sync input and syne source switch the channel switch the filter switching and the Sync Stripp
72. rent source Q419 for the fast transi tions of the blanking pulses DS417 and DS416 are neon bulbs intended to prevent damage to the Z Axis Amplifier if there is a ert high voltage discharge 4 15
73. s not have a handle The plain cabinet 1700F00 is used for custom installations or for using the instrument on a bench Fig 3 8 is a dimensional drawing of the 1700F00 cabinet i 3 6 REV DEC 1987 STANDARD 19 RACK 1730 SERIES INSTALLATION 1700F05 Fig 3 6 1700F05 rack mounting for two 5 1 4 inch units such as a 1730 Series and its companion 1720 Series TITO wm wm we e 1 Cut hole in panel the same size as the opening in the Monitor cabinet to allow the front panel casting to cover the cut FRONT VIEW OF CONSOLE 2 Cut hole the same size as the Monitor front casting to allow the Monitor front panel to align with the custom panel surface INSIDE OF CONSOLE 3 Drill 0 156 holes below each foot on the Monitor cabinet Fig 3 7 Typical custom installation 1730 SERIES INSTALLATION REAR VIEW 300 DIA 2 31 375 ial 250 RAD 2 1275 688 420 2 220 DIA 2 SIDE VIEW Fig 3 8 Dimensional drawing of the 1700F00 cabinet Cabinetizing There are two screws used to secure the instrument in its cabinet See Fig 3 9 They are installed in the upper corners of the instrument rear panel WARNING A Do not attempt to carry a cabinetized instrument without installing the mounting screws There is nothing to hold the instrument in the cabinet if it is tipped forward 1730 SERIES INSTALLATION DC Power Supply Field Upgrade The 1730 Series can
74. t timing elements for the 1 Line display Horizontal Output Amplifier The Horizontal Output Amplifier is composed of transistors Q858 Q860 Q862 and Q864 and is fed by current sources Q863 and Q865 R960 provides differential mode feedback resistors R958 and R959 provide common mode feedback for biasing the out puts at about 50 volts The gain of the amplifier is determined by R660 Sweep Length Adj and the magnified sweep registration by R661 Mag Regis tration Adj In LINE SELECT Q762 and Q763 switch in the X Axis horizontal component of the line select readout MICROCONTROLLER DIAGRAM 5 Circuits on this diagram include the Microprocessor and its associated NOVRAM De Multiplexer Latches and Output Drivers 1730 SERIES THEORY OF OPERATION Microprocessor The 1730 Series Microcontroller is an Intel 8051 type Microprocessor with self contained ROM code It operates in the 1730 1731 with an eight bit multi plexed address data bus pins 32 39 of U522 Port 1 pins 1 8 scans the front panel keyboard where each key is a member of a 4 X 4 matrix Port 2 of the Microprocessor provides eight I O lines three for the NOVRAM Chip Enable pin 21 Data pin 22 and Clock pin 23 four lines that drive the 1730 Series analog switching functions pins 25 28 and pin 24 which is the external com munications enable for the Auxiliary function The Microprocessor U522 uses three lines in Port 3 pins 13 1
75. tened sweep The input of the camera signal and an enable are through the rear panel Remote jack The choice of 3 step RGB or 4 step YRGB is made by changing the position of an internal plug jumper The 1730 Series has a unique Store and Recall function built in that allows for the storing of up to four front panel setups that can be recalled by pressing the appropriate recall button or a ground closure through the rear panel REMOTE connector In addition four factory programmed measurement setups can be accessed by external ground closures input through the REMOTE connector An auxiliary output to control a companion 1720 Series Vectorscope is provided through a rear panel connector The auxiliary output contains a bus for two way communications between the Waveform Monitor and Vectorscope microprocessors and a strobe to provide line select unblanking for the Vectorscope REV APR 87 1 1 1730 SERIES INTRODUCTION TYPICAL CONFIGURATIONS The 1730 Series Waveform Monitor is designed for operation either alone or with a 1720 Series Vectorscope Line select and measurement recall for this waveform monitor are also used by the vectorscope Because of these capabilities the 1730 Series Waveform Monitor is ideally suited to operate in a VCR bridge With its factory preset measurement routines that can be accessed through the rear panel REMOTE connector and the Store Recall functions it is possible to have one button measure
76. tering the AB mode When leaving BOTH the INPUT always returns to CH A VERTICAL GAIN Switch 4 Toggles between VAR X5 and off A BOTH mode consisting of VAR and X5 is accessed by holding the push button until both LED indicators are lit REV APR 1987 2 1 1730 SERIES OPERATING INSTRUCTIONS yo NUOJ3 NOW AYM SUOTJE20 023102 IUB d JUOXJ SIAI 123135 3NF sn3o4 08L1 1 2 Ba REV APR 1987 2 2 1730 SERIES OPERATING INSTRUCTIONS SUO1 890 OAFUOI PUB JUOJI GELI ze BU an 293135 INN smo3 ITVS ald i 1YLNOZ HOH SX uva d 40 B 4514 20 NIYD WALUYA i em WUHI Pre E indi ae CSE Eger O 2 3 REV APR 1987 1730 SERIES OPERATING INSTRUCTIONS GAIN control 5 Enabled when the GAIN switch is in VAR Adjusts amplifier input gain rate to make any input waveform signal between 0 8 and 20V peak to peak a full scale display Control has no detent DC REST 6 Toggles the DC Restorer on and off When turned on the restorer comes up as previously selected in either the slow or fast position Pushing and holding the switch in toggles the restorer between FAST and SLOW Once the restorer speed has been selected pushing the DC REST button turns the DC Restorer on at the selected speed or off POSITION 7 Variable control that positions tne waveform display vertically i HORIZONTAL SWEEP 8 Toggles betwe
77. the signal The output of U892B is fed back to the clamp circuit through CR887 Filter Selection The three filters are driven from current source Q791 through analog switeh U 86 Only one switch section will be closed at a time Bias current for the ac coupled filters 3 58 and 4 43 MHz is supplied through Q774 If the band pass filter Chroma is selected CR670 3 58 MHz or CR671 4 43 MHz turns on Q775 and saturates Q774 to put 11 8V on one end of R773 The other end of this resistor con nects to an emitter ofa common base amplifier in the Gain Cell Diagram 2 At 0 V 2 mA of bias current flows into the emitter with 1 mA of signal current Calibrator The Calibrator consists of Q587 which is driven with a 100 kHz square wave from the Micro processor Q587 is switched at this rate and its emitter current drives the Low Pass filter through U585 pins 10 and 11 VERTICAL OUTPUT DIAGRAM 2 This diagram contains the Gain Cell Gain Cell Amplifier Switchable Amplifier 204 DC Restorer Output Amplifier and Pix Monitor circuits Gain Cell The video signal driving the Gain Cell is through 684 a common base amplifier It has a low input impedance to terminate the filters The collector sig nal is developed across R682 and R580 in parallel and will be 0 5 V The Gain Cell U578 is driven differentially with R675 determining the maximum gain Pinl of U578 is the signal current input driven by Q684 its level is 3 Vd
78. trol grid bias The sine wave from the 100 V supply winding of T332 is coupled through C428 to a clipping circuit consisting of CR425 and CR426 Clipping level for the positive excursion of the sine wave is set by the ert Bias adjustment R536 negative clipping level is set by the INTENSITY control through the Z Axis 1730 SERIES THEORY OF OPERATION Amplifier The clipped sine wave is coupled through C220 to a rectifier made up of CR121 and CR122 The rectified clipped sine wave is the ert control grid bias voltage C219 is a speedup capacitor for the fast transitions of the blanking signal from the Z Axis Amplifier DS118 and DS119 limit the ert grid to cathode voltage at instrument turn on and off Z Axis Amplifier This is a high gain inverting amplifier with feed back R410 stabilizes the gain at a low value The input is the summing junction at pin3 of J546 which is set to 5 V by R412 and R418 so that the Z Axis Control circuit on the Main A3 circuit board can drive this amplifier When there is no input current from the Z Axis Control the output is set to 10V by R411 When there is input current the output is driven more positive Q516 is an emitter follower that drives Q518 which with Q519 forms a cascade pair for good high frequency performance Q419 is a constant current source that is the col lector load for Q519 The collector of Q519 is the output of the Z Axis Amplifier C520 speeds up the constant cur
79. ut for the amplifier is at pin 2 of U978 and the output is at pin 7 R883 and R884 on the amplifier input develop the signal voltage 0 554V 1 mA 554 The overall gain for this non inverting amplifier is set by feedback divider resistors R975 and R876 The signal amplitude at pin 7 is 2 V 0 554 1 3570 1370 Q973 offsets the video during LINE SELECT mode to provide a bright up pulse The amount of offset is determined by R870 the emitter resistor for Q973 TIMING DIAGRAM 3 This diagram contains the Horizontal AFC Vertical Sync Generator RGB Amplifier and the Field ID and Trigger Select circuits of the 1730 Series hori zontal sweep Horizontal AFC Composite syne from U735 13 drives a non retrig gerable one shot U844B that locks out the twice line rate pulses in the vertical interval This line rate signal at pin 5 of U844B drives the Back Porch Generator U844A the Horizontal AFC U644 and the sweep trigger selector U535 U644 and the associated circuitry provide a fly wheeled line rate square wave for faithful horizontal timing information to the Microprocessor even in the presence of large amounts of noise R636 adjusts the signal phase so that the Microprocessor timing for some of the line rate switching Flat Low Pass and Line Select occurs during horizontal sync time This output signal is also used for field identification A back porch pulse for the DC Restorer is generated by U844A and Q
80. v Within 2 Differential Linearity 0 1 div or less compression or 1 ps div amp 0 2 ps div Within 2 expansion of a center screen 5 div signal when positioned over the 10 center divisons Sweep Magnifier Magnification occurs about the Registration center of the screen HORIZONTAL Any portion of a Position synchronized video sweep can be positioned on screen in all sweep modes CHARACTERISTIC LINE SELECT Table 1 4 cont PERFORMANCE REQUIREMENTS 1730 SERIES INTRODUCTION SUPPLEMENTAL INFORMATION Displays the selected line in 1 LINE Displays the selected line first in 2 LINE Intensifies selected line in 2 FLD In 15 LINE displays overlayed lines in 1 or 2 LINE intensifies the selected 15 lines in 2 FLD A small 15 is added to the bottom of the ert readout in 15 LINE mode Lines 1 to 263 Lines 1 to 262 Lines 1 to 262 Lines 1 to 313 Lines 314 to 625 Lines 1 to 312 Lines 1 to 263 Lines 264 to 525 Lines 1 to 262 REV APR 87 1 5 1730 SERIES INTRODUCTION Table 1 5 Synchronization CHECK STEP PERFORMANCE REQUIREMENTS CHARACTERISTIC SUPPLEMENTAL INFORMATION Input Requirements Internal Reference NTSC and PAL M Composite video or black aa amplitudes 40 IRE 6 dB Composite video or black burst with sync amplitudes 300 mV 6 dB ff EXTernal REFerence Eg EXT REF Input
81. w in the circuit The Focus control operation must also control two different display criteria In the normal mode of operation the Focus voltage will be selected by the controi setting only Q242 is off When a Line Select Un Blanking pulse oceurs U239B turns off and additional current flows through Q242 R245 the LS Focus adjustment is adjusted for optimum focus in LINE SELECT at the normal display focus setting Trace Rotation Trace rotation is necessary to compensate for changes in the magnetic field surrounding the 1730 Series Q142 and Q143 are emitter followers 4 12 BLANK 2 FIELD SWEEP SELECTED LINE BLANK 2 w ROENG N Fre INTENSIFIED LINE 0346 0347 Z AXIS OUT ANALOG FRONT PANEL INTENSITY LEVEL b BLANK 2 LINE SWEEP READOUT BLANK 2 ELEMENTS READOUT ROEN TIME READ Z AXIS OUT SETTING ANALOG INTENS CONTROL SETTING Fig 4 5 Z Axis timing for readout a 2 Field display intensifies the line lines to provide a bright up strobe b In 1 or 2 line sweep alpha numeric readout in the upper left corner of the CRT is used to convey the number of the first selected line that provide the Trace Rotation current to a coil located inside the CRT shield around the tube Cur rent amplitude and polarity are controlled by the front panel ROTATE serewdriver adjustment Graticule illumination U263A is a triangle generator whose output is com pared to the frorit panel SCALE control
82. y ing conductors at or near earth ground the neutral conductor Only the Line conductor is fused for over current protection Systems that have both current carrying conductors live with respect to ground such as phase to phase in multiphase systems are not recommended as power sources Mains Frequency and Voltage Ranges 1700 Series instruments operate over a frequency range of 48 to 66 Hz and at a nominal mains volt ages of 120 Vac or 220 Vac The instrument is shipped from the factory set up for either 120 V or 220 V operation be sure that it is operated with the selected mains voltage The rear panel of the instru ment is marked by placement of a screw to identify the correct operating mains voltage See Fig 3 1 Changing The Mains Voltage Mains voltage is set for 120 Vac by the presence of a wire strap on the Power Supply Assembly Al etched circuit board See Fig 3 2 If there is no strap in the 120 V position the mains voltage is set for 220 Vac To convert from 120 to 220 simply remove the strap To convert from 220 to 120 solder in a wire strap across the 120 Vac circuit board pads There are two sets of pads either the inner or outer set of pads can be used Operating Options Not all installations are identical In order to make operation of the 1730 Series Waveform Monitor as flexible as possible there are internal jumpers that can be changed to provide operating options For example it is possib

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