Tektronix 7834 Instruction Manual Download Page 35

Page: 35 / 134

Summary of Contents for 7834

Page 1: ...IN TRU TION MANUAL Tektronix Inc P O Box 500 Beaverton Oregon 97077 Serial Number 070 1988 00 First Printing OCTOBER 1976...

Page 2: ......

Page 3: ...SERVICING INSTRUCTIONS ARE FOR USE BY QUALIFIED SERVICE PER SONNEL ONLY TO AVOID ELECTRIC SHOCK OR OTHER PERSONAL INJURY DO NOT PERFORM ANY SERVICING OTHER THAN THAT DESCRIBED IN THE OPERATORS IN STR...

Page 4: ...time slot TS pulses 2 11 produced by Q3445 3 42 3 34 Typical encoding scheme for voltage sensing plug in 2 13 unit Coding shown for deflection factor of 100 microvolts 3 44 2 13 3 35 Idealized curren...

Page 5: ...ace circuit board assembly 8 33 A6 partial Location of Z Axis Level adjustment 8 6 A6 Logic circuit board assembly 8 34 A20 Location of Geometry and Horizontal Gain adjust 8 7 A7 Trigger Amplifier cir...

Page 6: ...rminal grounding type connector The voltage to ground earth from eitherpole of the power source must not exceed the maximum rated operating voltage 250 volts Before making connection to the power sour...

Page 7: ...o avoid fire hazard use only the fuse specified in the parts list for your instrument and which is identical in the following respects A Type Slowblow fast blow etc B Voltage rating 250 V etc 19 C Cur...

Page 8: ...to ensure safe operation Improper repair of this unit can result in hazardous potentials on the instrument chassis Do not remove the plate insulator block insulator or transistor shield from the heat...

Page 9: ...een the top and bottom board layers All soldering on these boards should be done with extreme care to prevent breaking the connections to this center conductor Only experienced maintenance personnel s...

Page 10: ...ce In addition the REDUCED SCAN feature increases the stored writing speed capability Power supply voltages are closely regulated to maintain instrument performance when variations in line voltage lin...

Page 11: ...includes detailed circuit schematics locations of assembled boards within the instrument voltage and waveform information circuit board component locators and locations of adjustments to aid in perfo...

Page 12: ...r output terminals TABLE 1 1 Power Cord Conductor Identification The power cord plug required depends upon the ac input voltage and the country in which the instrument is to be used Should you require...

Page 13: ...address the name of a person at your firm who can be contacted complete instrument type and serial number and a description of the service required If the original packaging is unfit for use or not av...

Page 14: ...tween Vertical Compartments All Vertical Modes Delay Line Vertical Display Modes LEFT ALT ADD CHOP SPECIFICATION TABLE 1 4 Electrical Characteristics Performance Requirement 1 or less Left vertical un...

Page 15: ...formation 7834 Performance Requirement Right vertical unit displayed 1 MHz within 20 Positions B trace at least 4div above and below Y trace when 7834 operates in dual sweep mode Compatible with all 7...

Page 16: ...arewmve 450D Positive going with Qsdine near Wound Selected by nopenel CALIBRATOR switch 40mV U 4V 4V 4mV 40mV 0 4 V 40 mA available through CALIBRATOR output with optional BNC to Current Loop adapter...

Page 17: ...unit delayed gate Positive going with baseline at0Vwithin 1 UV into 1 MD Positive level when Atime base delayed sweep o O sweep is enabled O V within 1 0 V into 1 K0D when sweeps are disabled Output i...

Page 18: ...negative 2 V provides complete unblanking from minimum intensity condition Approximately 470 52 Approximately 0 V Within 15 V dc plus peak ac Selected by front panel switch Continuously displayed Con...

Page 19: ...til end of transfer cycle Also turns off when displayed time base operates in other than single sweep mode and when MULTI TRACE DLY control is not in detent One frame of readout is provided in end of...

Page 20: ...ARPERSIST andFAST VARPERS ST TABLE 1 4 CONT Electrical Characteristics STORAGE REMOTE CONNECTORS SWITCHES Performance Requirement Approximately 10 kV approximately 12 kV in reduced Within 0 di nfv rbo...

Page 21: ...ss than 40 MA to low level 0 5 V to 15 V sink less than 10 mA in less than 1 ms resets the sweep 10 ps at 50 amplitude points or 15 V dc plus peak ac 2 probe power connectors General Information 7834...

Page 22: ...200 TABLE 1 4 CONT Electrical Characteristics Approximately 0 V Anpnoxinoate y 1G V o 15V dc plus peak ac TTL voltage compatible 1 ms n em 1mso oo Approimate y21 V Approximately 10 kE2 Approximately 1...

Page 23: ...limits Nonoperating EMC Electro Magnetic Compatibility in accordance with MIL STD 462A when equipped with Option 3 0 to 50 C 55 to 75 C 15 000 feet Test limit 50 000 feet General Information 7834 NOTE...

Page 24: ...ument Only TABLE 1 6 Physical Safe operating temperature maintained by do fan Auto matic resetting thermal cutout protects instrument from overheating 30 minutes for rated accuracy Anodized front and...

Page 25: ...Tracer S Sampling D Digital T Time base sampling The third and fourth digits of the plug in type number do not carry any special connotation An N suffix letter added to the normal four digit type num...

Page 26: ...om 35 to 50 C Accuracy 4 5 24 ns Deflection Factor accuracy is checked as follows EXT CAL 0 to 50 C Plug in gain set at a temperature within 10 C of operating temperature using an external calibrator...

Page 27: ...ual Delay Line Readout Access Unit 100 0 kHz to 1 8 GHz Spectrum Analyzer 1 kHz to 1 8 GHz Spectrum Analyzer Accepts Plug In Sampling Heads Time Domain Reflectometer and Sampling Applications Dual Tra...

Page 28: ...General Information 7834 STANDARD ACCESSORIES 1each PowerCord 1 each Operators Manual 1 each Instruction Manual 1 each Grey Faceplate Filter installed 1 each Storage Green Faceplate Filter...

Page 29: ...ens Magnification may be set at 0 67 or 0 85 Order C 5A C 5A Opt 1 The C 5A Opt 1 camera is the C 5A without the pulsed graticule illumination feature Order C 5A Opt 1 C 52 Electronically controlled s...

Page 30: ...essary Order Polaroid pack film C 58P Order Polaroid roll film C 58R Order Sheet or roll film holders C 58G CART TEK LAB CART MODEL 3 Mobile equipment cart with 14 X 21 top tray lockable storage drawe...

Page 31: ...in unit pull out on the release latch to dis engage the plug in To meet the EMC electromagnetic compatibility specifications cover all unused plug in com partments with an EMC shielded blank plug in p...

Page 32: ...Operating Instructions 7834 2 2 NOTE AL SELECTOR SWITCH AT THE REAR OF THE A HORIZ COMPARTMENT Figure 2 1 Front panel controls connectors and indicators...

Page 33: ...nd FAST VAR PERSIST storage modes 14 SAVE Retains storage display in a nonerasable mode with continuously variable intensity 15 MULTI TRACE DLY Controls time between successive sweeps when operating i...

Page 34: ...Operating Instructions 7834 2 4 Figure 2 2 Rear panel controls and connectors...

Page 35: ...cators and of the lighted push button switches on associated plug in units LINE VOLTAGE SELECTOR Sets instrument to 115 volt or 230 volt nominal line operation REMOTE RESET INPUT Input for activating...

Page 36: ...ion 3 Install Tektronix 7A Series amplifier units in the LEFT VERT and RIGHT VERT compartments Install Tektronix 7B Series time base units in the A HORIZ and B HORIZ compartments Press the POWER switc...

Page 37: ...me base sweep rate switch throughout its range notice that the display alternates between amplifier units at all sweep rates 20 Set the VERTICAL MODE switch to CHOP Turn the A time base unit sweep rat...

Page 38: ...itch positions Notice that a stable display is obtained for all positions of the VERTICAL MODE switch straight line in RIGHT switch position 31 Set the A TRIGGER SOURCE switch to LEFT VERT Again seque...

Page 39: ...ntensified Notice that the setting of the intensity controls determines the amount of intensity modulation that is visible Dis connect the cables Storage Operation Operating Instructions 7834 44 Conne...

Page 40: ...sweep is stored trigger time base unit if necessary 60 Change the setting of the vertical position control and initiate another sweep by pressing the reset button on the time base unit Notice that the...

Page 41: ...e from scratches WARNING Operating Instructions 7834 Do not remove the clear plastic implosion shield covering the crt face plate the crt implosion shield provides protection to the operator from crt...

Page 42: ...ensity level about midrange 5 Turn the FOCUS control fully counterclockwise and set the ASTIG adjustment to midrange 6 Set the FOCUS control so the thickness of the sine wave trace is as thin as possi...

Page 43: ...unit is pressed the word IDENTIFY appears in the readout location allocated to that plug in and channel Other readout words 1987 4 LEFT VERT _ RIGHT VERT A HORIZ B HORIZ CHANNEL1 CHANNEL1 CHANNEL1 CHA...

Page 44: ...is out of detent position and the displayed time base unit is in a repetitive sweep mode 2 14 STORAGE SAVE READOUT MODES When the storage system enters the SAVE mode the operation of the readout syste...

Page 45: ...ires that the displayed time base unit complete a sweep in order to initiate the delay interval prior to the erasure the Periodic Erase mode repet itively erases independent of the displayed time base...

Page 46: ...the capabilities of the plug in units which are used in the instrument e g a dual trace amplifier unit can be used in either of the two single channel modes in the dual trace mode or added algebra ic...

Page 47: ...ly switched between channels at about a one megahertz rate In general the CHOP mode provides the best display at sweep rates slower than about 20 milliseconds division or Operating Instructions 834 wh...

Page 48: ...de Chopped Mode When the CHOP button of the HORIZONTAL MODE switch is pressed the display is electronically switched between the two time base units at about a 200 kilohertz rate In general the CHOP h...

Page 49: ...signal in order to obtain a triggered stable display Calibrator Output The CALIBRATOR provides a convenient signal for checking basicvertical gain and sweep timing The calibrator signal is also very...

Page 50: ...from the instrument Display Photography A permanent record of the crt display can be obtained with an oscilloscope camera system The instruction manual for the Tektronix Oscilloscope Cameras includes...

Page 51: ...at the start of the displayed sweep Then the display stored on the transfer storage mesh will not be transferred until the displayed sweep has ended and the negative transition of the remote storage...

Page 52: ...e 7S11 sampling unit and the 7T11 sampling sweep unit Direct interconnections between the 2 22 7S11 and the 7T11 require these units to be adjacent with the 7S11 in the RIGHT VERT compartment and the...

Page 53: ...dition to their normal uses as time base generators This feature allows an external signal to provide the horizontal deflection to the crt For most of the time base units with the amplifier function t...

Page 54: ......

Page 55: ...ING SERVICING INSTRUCTIONS ARE FOR U5E BY QUALIFIED PERSONNEL ONLY TO AVOID PERSONAL INJURY DO NO p PERFORM AriY SERVICING OTHER THAN THAT QON AINED I N OPERATING INSTRUCTIC NS UNLESS YOU ARE QUALIFI...

Page 56: ......

Page 57: ...cuit is described in detail with supporting illustrations when appropriate to show the relationship between the stages in each major circuit Detailed schematics of each circuit are located in the Diag...

Page 58: ...RIGGER SIGNALS TO B HORIZONTAL HORIZONTAL SIGNALS VERTICAL SIGNALS READOUT DATA FROM ALL PLUG IN UNITS READOUT INTERROGATING TIME SLOT PULSES TO ALL PLUG IN UNITS CONTROL SIGNALS TO ALL PLUG IN UNITS...

Page 59: ...RASE INPUT REMOTE SAVE INPUT r REMOTE STORAGE GATEINPUT AC LINE OPERATING VOLTAGES TO ALL CIRCUITS Figure 3 1 Basic block diagram of the 7834 Storage Oscilloscope continued Theory of Operation 7834 HV...

Page 60: ...or a more detailed analysis of digital logic refer to the follow ing textbooks Robert C Baron and Albert T Piccirilli Digital Logic and Computer Operation McGraw Hill New York 1967 Thomas C Bartee Dig...

Page 61: ...gate is LO if and only if all of the inputs are at the HI state A device with two or more inputs and one output The output of the OR gate is HI if one or more of the inputs are at the H I state A dev...

Page 62: ...nput The output of this gate is HI if either the A input is LO or the B input is HI Normally superimposed on an input line to a logic symbol Indicates that this input usually the trigger input of a fl...

Page 63: ...e trig ger T input may be of either polarity depending on the device A bistable device with three or more inputs and two outputs either or both outputs may be used When triggered the outputs change st...

Page 64: ...ector of Q382 switches 0384 on and off When 0384 is on the current from R383 and R384 flows to ground When Q384 is off this current flows through CR386 and R386 into the volt age divider network of R3...

Page 65: ...ET U322A B U326A B STORAGE SWEEP GATE LATCH U322D U332D SYORAGESWtEP GATE LOGIC Figure 3 2 Detailed block diagram of the Calibrator and Mode Switch J395 CALIBRATOR VOLTS Theory of Operation 7834 A OR...

Page 66: ...sed in detail but are provided to aid in relating the function performed by a given stage to standard logic techniques It should be noted that these logic diagrams are not an exact representation of t...

Page 67: ...Figure 3 3 Detailed block diagram of the Logic circuit Theory of Operation 7834...

Page 68: ...of two or more signal lines ALTERNATE PULSE STAGE The third function per formed by the Horizontal Logic stage is to produce an Alternate Pulse signal for use by the Horizontal and Vertical Binary sta...

Page 69: ...rnate Pulse is produced only at the end of the A sweep even when the HORIZONTAL MODE switch is set to B This is necessary since the A time base estab Z Axis Logic Q4462 A SWEEP LOCKOUT Theory of Opera...

Page 70: ...n 7 of U4494 directly from pin 4 of U4320 The Horizontal Chopped Blanking signal is connect ed to U4494 from pin 4 of U4340 through LR4338 04336 and CR4487 CR4488 Notice that this signal is connected...

Page 71: ...I Hl 4 HI A A DELAYS B fl LO HI LO 7 Lo cp A A WITH VERTICAL UNIT IN B COMPARTMENT HI I LO B B WITH VERTICAL UNIT IN A COMPARTMENT NO OUTPUT PULSE LO AT OUTPUT P HAS NO EFFECT IN THIS CASE POSITIVE GO...

Page 72: ...B Gate level at pin 4 and HI Delay Mode Control Out level at pin 5 The B INTENSITY control determines the output current when the B Gate level at pin 4 and the Display B at pin 15 are both HI The curr...

Page 73: ...LOGIC HI MAX VOLTAGE OR CURRENT q HAS NO EFFECT LO MIN VOLTAGE OR CURRENT VAR VARIABLE CURRENT 0 to 4 mA Theory of Operation 7834 A INTENSITY PLUS _INTENSIFIED B INTENSITY NO OUTPUT wJ Figure 3 9 A Lo...

Page 74: ...ays HI when Display B is LO and vice versa This action allows independent pairs operation sweep slaving in the ALT position of the VERTICAL MODE switch and the ALT or CHOP positions of the HORIZONTAL...

Page 75: ...and the A time base unit set for nondelayed operation is that the RIGHT VERT unit is always displayed at the sweep rate of the A time base unit and the LEFT VERT unit at the sweep rate of the B time...

Page 76: ...pins for the Plug In Binary IC U4412 This stage uses the same type of integrated circuit as the Horizontal Binary and Vertical Binary stages When the Alternate Drive level is H I and the plug in unit...

Page 77: ...DISPLAY B RATE 9 HAS NO EFFECT IN THIS CASE n 1 1F OUTPUT IS LO PRIOR TO LO IT GOES HI AND VICE VERSA OUTPUT DELAYED MODE DISPLAY LEFT j SWEEP SLAVING Figure 3 13 A Logic diagram for Vertical Binary s...

Page 78: ...95 14 1988 39 I This stage operates as follows Assume that Q2 is conduct ing and 01 is off The collector current of Q2 produces a Figure 3 14 Input and output pins for Plug In Binary IC U4412 voltage...

Page 79: ...nected to the Vertical Chopped Blanking stage This signal To T1 1195 16 1988 41 Figure 3 16 A Diagram of clock generator stage B Idealized waveforms for clock generator stage Vertical Chopped Blankin...

Page 80: ...ermined by the relationship between the levels of its inputs If pin 10 is more positive H I than the grounded input the output is HI also if it is more negative the output is LO A Q O IQ OQ A 2 O JO O...

Page 81: ...for this stage are shown in Figure 3 1913 DELAY Figure 3 18 Idealized waveforms for Vertical Chopped Blanking stage Theory of Operation 7834 1195 18 1988 43 The repetition rate of the output signals...

Page 82: ...TAL I CHOPPED 1 BLANKING PIN 4 1 I VERTICAL CHOPPED BLANKING PIN 4 I OF U4320B I produced at pin 4 with every fifth Clock pulse Also notice that with the HORIZONTAL MODE switch set to CHOP two complet...

Page 83: ...stage Theory of Operation 7834 1195 20 1988 45 When the VERTICAL MODE switch is set to RIGHT a HI level is connected to the base of 04382 through R4321 This forward biases Q4382 and the positive going...

Page 84: ...DE HORIZ ALT MODE VERT DELAY MODE CONTROL RIGHT MODE VERTICAL CHOPPING SIGNAL FROM PIN 1 U4340 Figure 3 21 Logic diagram of Vertical Mode Logic stage TRACE SEPARATION D HAS NO EFFECT IN THIS CASE 1195...

Page 85: ...ntrol for independent pairs operation so that the vertical position of the B sweep display is determined by the slaved LEFT VERT plug in unit only If delayed sweep operation is selected the Delay Mode...

Page 86: ...ure 3 23 Detailed block diagram of the A Trigger Selector circuit Input Output Combinations for A Trigger Channel Switch A Trigger VERT SIG OUT TRIGGER SIGNAL _ _ o TO A HORIZONTAL UNIT D Has no effec...

Page 87: ...rovides the control signals to operate the B Trigger Channel Switch When the B TRIGGER SOURCE is set to LEFT the B Trigger Channel switch allows the Left Trigger Preamplifier to pass trigger signals f...

Page 88: ...V LO 0 5 V B Trigger B Trigger Channel Switch Output to U620 and U680 1988 49 U680 D Has no effect in this case Switches between HI and LO at a rate determined by the sweep speed of time base unit s...

Page 89: ...pin 3 is LO and pin 10 is HI in this condition the vertical signal is now allowed to pass through the stage to the Vertical Amplifier circuit Resistors R4610 and R4611 are selected in conjunction wit...

Page 90: ...to the LO level zero volts This actuates relays K822 K838 to connect the B Delay Compensation network into the circuit The B Delay X Y Compensation network is an optional feature For instruments whic...

Page 91: ...or a given operating mode and plug in combination Up to 8 words can be displayed in one frame Figure 3 26 shows the position of each word in a complete frame Column One of the vertical lines in the Ch...

Page 92: ...racter selection matrix for 7834 Readout System H X W H O y F H a O O U 0 n Q W w O OC LL W O F U O_ a a c N Q 2 Z Q U a F W uw O a O F Q O u _ w O u w W W J N Q W J Q Vj U fA Q Q W 0 U O E J Z_ O 2 O...

Page 93: ...hem and the time slot input lines The resultant output is a sequence of 10 analog current levels that range from 0 to 1 milliampere 100 mi croamperes step on the row and column output lines This row a...

Page 94: ...2 O F J W X W O F QJ F 0F0 WONO OQyF F OZFF MO O wZ f0 O W O F QJ W W u W 0 W J FQ 7 UW W W f 0Q F J Q F FQ 1 Z 2 0 0 XONJ w0 a Q F WZ F O QF QO Sd U Figure 3 29 Detailed block diagram of the Readout...

Page 95: ...me point within each word regardless of the information encoded in time slot 1 2 or 3 preceding this digit Also by encoding row 10 and column 0 during any time slot a blank space can be added to the d...

Page 96: ...43 This acti vates U3463 during the quiescent period of the Strobe pulse collector of Q3442 negative and diverts the output current of Row Decoder U3429 to row 2 The purpose of this configuration is t...

Page 97: ...when the Display Skip condition occurs for all positions in a word Notice that there is no output at pins 12 13 14 and 16 under this condition This means that the crt display is not interrupted to di...

Page 98: ...plug in units to obtain data for the Readout Sys tem The Trigger pulse at pin 15 switches the Time Slot Counter to the next output line the output signal is se quenced consecutively from time slot 1 t...

Page 99: ...8 is already LO The output of U3449C goes H I to disable the Timer stage so it operates in the Display Skip mode The HI at pin 10 of U3449C also holds U3449D enabled so it maintains control of the fl...

Page 100: ...R 120 adds one unit of column current during time slot 2 and along with the one unit of current from the row output the Readout System is instructed to add an invert arrow to the display Resistor R 1...

Page 101: ...ur rent results in a total of three units of column analog cur rent during this time slot Referring to the Character Selection Matrix Fig 3 27 three units of column current along with the two units of...

Page 102: ...lay Skip action The End of Word level connected to their emitters is LO only during time slot 1 This means they are enabled 3 46 only during this time slot These transistors allow the Zeros Logic and...

Page 103: ...of current at the input of the Column Decoder This produces a zero TIME SLOT 8 6 MEMORY D IDENTIFY Figure 3 36 Block representation of memory sequence in U3401 Theory of Operation 7834 1195 35 after...

Page 104: ...rovided by Q3419 see Display Skip Generator allows the 3 48 prefix to be shifted from m 100 microamperes of column current column 1 to no prefix 0 column current column 0 so only the unit of measureme...

Page 105: ...al to space the characters horizontally on the crt After each character is generated the negative going edge of the Ready signal at pin 5 advances the Character Position Counter This pro duces a curre...

Page 106: ...e X horizontal input signal to space the characters horizontally on the crt see previous discussion 3 50 DECIMAL POINT LOCATION ENCODED DURING THIS TIME SLOT NO DISPLAY ALWAYS SKIPPED EVEN IF NO DATA...

Page 107: ...n W O z H U m _ QO r J J Z W WQW ZO W W U y O U QU I W Z ZWZVO MU Z_ cc a Q H7 iN LU _5 CCyaQd Figure 3 39 Flow chart for character generation by the Readout System Theory of Operation 7834 W r 1195 3...

Page 108: ...Converter Rectifiers circuit Line Selector switch S1212 allows the instrument to oper ate from either a 115 volt nominal or a 230 volt nominal line voltage source In the 115 volt position rectifier CR...

Page 109: ...Control stage short circuits one half of this winding to either delay the turn on of 01234 and 01241 or to completely stop their switching action Over Voltage Stop Theory of Operation 7834 The switchi...

Page 110: ...Tran sistors 01248 and 01246 continue to conduct until the dis charge current of C1243 through R 1248 drops below the 3 54 holding current of 01248 After 01248 returns to its forward blocking state CR...

Page 111: ...254 and 01252 which turns off the Inverter The Invert Theory of Operation 7834 er will remain off while C1259 discharges through R 1261 which keeps 01254 and 01252 turned on The Inverter restarts in r...

Page 112: ...less negative due to an increase in load or a decrease in input voltage as a result of line voltage changes or ripple the voltages across divider 81512 81513 and 81514 decreases also This results in a...

Page 113: ...REGULATED R1428 54 VOLTS R1457 50 VOLT FEEDBACK AMPLIFIER 01508 01522 01534 GRAT ILLUM 5 VOLT FEEDBACK AMPLIFIER 01560 01582 01585 Figure 3 42 Detailed block diagram of the Low Voltage Regulator circ...

Page 114: ...limiting operates in a similar manner as described for the 5 Volt Supply Error voltage to the base of 01490B is provided by divider R1412 and R1429 referenced to the 50 V Sense line from the 4 50 V Se...

Page 115: ...pins 6 and 12 provide a signal path for the output of the Auxiliary Y Axis Amplifier stage The Vert Gain adjustment R1730 sets the Figure 3 43 Detailed block diagram of the Vertical Amplifier circuit...

Page 116: ...ntal readout center adjustment R1815 to ground Grounding the center tap allows R1815 to horizontally position the readout display on the crt 3 60 Input Amplifier The Input Amplifier stage is a parapha...

Page 117: ...J ZH w LL 0 NWW JH J LC LL a Qa Figure 3 44 Detailed block diagram of the Horizontal Amplifier Theory of Operation 7834 w O Z Q w 00 O Q JZ 0 f ZF w 00 MOC 00 _ _NJw w OOw_i N I 2aCL...

Page 118: ...om the high voltage secondry Filtering for this voltage is accomplished by 132015 and C2014 Resistor 132014 limits current under fault condi 3 62 Z AXIS CRT tions Diode CR2016 clamps the tetrode volta...

Page 119: ...Figure 3 45 Detailed block diagram of the CRY Circuit Theory of Operation 7834...

Page 120: ...ontrol the trace alignment by varying the mag netic field around the crt The Y Axis alignment coil L2201 affects the crt beam after vertical deflection but before horizontal deflection Therefore only...

Page 121: ...and develops the wave forms that are applied to the crt storage electrodes REDUCED SCAN AUTO FOCUS FULL SCAN AUTO ASTIG COMPENSATION EMITTER FOLLOWER 02436 02405 Theory of Operation 7834 REDUCED SCAN...

Page 122: ...RESET FROM A OR B SINGLE SWEEP s LOGIC FROM U2588B U2552B U2556A U2684A B U2682A U 2594 B 02654 02658 02674 02668 02664 02694 02678 02612 Figure 3 47 Detailed block diagram of the 7834 Storage System...

Page 123: ...VER 02802 02822 22804 02826 02808 02828 02814 02834 02818 02838 FAST MESH DRIVER 02862 02864 02868 02873 02874 COLLIMATION ELECTRODE 4 DRIVER 02942 02946 FLOOD GUN CATHODE DRIVER 03054 03064 Figure 3...

Page 124: ...PGATE I I 1 I I I I I I I I I I I I I HI I I I I I STORAGE LO I I LO I LOCKOUT I I I I I SINGLE SWEEP HI I I I I HI I HI RESET I I I LE SWEEP I RESET I I 1 I I I 1 t I I I I I I TIME IN SECONDS 0 1 2...

Page 125: ...FGK 1 1 1 I I HI I 1 1 I ERASE I I LO TSFR HI LO LO PREP LO I FAST PREP I MULTI Ht I HI LO I LO 1 I I I I W 1 I HI 1 I LO I II LO X LO I I V I LO 1 I I I I Z I I I I I I I IHI 1 HI STORAGE LO I I LO...

Page 126: ...EVELO VTO 20V L EVEL 1 9V 6V703V I II I I I II I I 150v 1112V _ BISTABLE FAST Figure 3 50 Bistable fast storage mode timing diagram I I II I I 1 2 3 4 5 6 7 9 9 1 0 1 1 1 2 1 3 1 0 1 5 1 6 1 7 1 6 19...

Page 127: ...FULLY CW PREPLEVEL o V TO 12 V ABOVE OP LEVEL PULSE FREQUENCY 1 W Hz PULSE AMPLITUDE 0 V TO 15 V AROVE OP LEVEL PULSE WIDTN 2y I AUTO SINGLE SWEEP RESET Iy RW V r vPpPLEVEL OvT0 75V I AUTO SINGLESWEEP...

Page 128: ...ource 02536 controlled by the AUTO ERASE viewtime control R2537 Each time 02538 turns on to discharge C2534 a voltage spike is applied to R2540 which turns 02542 off and trig gers an Erase pulse Trans...

Page 129: ...e time base unit s via the A or B Single Sweep Logic line and the Storage Single Sweep Reset line and generates the Storage Single Sweep Reset signal to reset the time base unit s during any Erase or...

Page 130: ...2 02506 02508 and U2565A generates a Clock frequency pulse train at the 3 74 collector of 02508 with pulse width continuously variable by the PERSISTENCE control These pulses control the persistence o...

Page 131: ...is off during the Erase and Multi Trace cycles X or W HI and in the fast storage modes up to the end of the transfer operation W HI Additionally 02686 is turned on when the Save signal is H I The del...

Page 132: ...le and Fast Var Persist respectively adjust the Fast Transfer Level AV in each Fast Storage mode between zero and 3 volts below the Fast Prep Level The STORAGE LEVEL control R2720 provides offset to t...

Page 133: ...In addition W goes HI and remains HI until the end of the Tsfr pulse and Fast Prep oscillates at the Clock signal frequency These Trace Alignment Theory of Operation 7834 signals cause the Storage Me...

Page 134: ......

Search results

Summary of Contents for 7834

Reviews:

Related manuals for 7834

Brands by name

Popular brands

Tektronix 7834, Instruction Manual

Search results

Summary of Contents for 7834

Reviews:

Related manuals for 7834

Brands by name

Popular brands