Tektronix 7T11A Instruction Manual
  1. Manuals
  2. Brands
  3. Tektronix Manuals
  4. Test Equipment
  5. 7T11A
  6. Instruction manual
Tektronix 7T11A Instruction Manual

Tektronix 7T11A Instruction Manual

Hide thumbs
Table of Contents

Advertisement

Quick Links

Download this manual
INSTRUCTION
TEK
MANUAL
First Printing JUN 1986
Revised SEP 1986
art No. 070-6176-00
roduct Group No. 42
7T11A
SAM LING SWEE
lease Check for
CHANGE INFORMATION
at the Rear of This Manual
T ek t ronix
UNIT
COMMTTTED TO EXCELLENCE

Advertisement

Table of Contents
loading

Related Manuals for Tektronix 7T11A

Summary of Contents for Tektronix 7T11A

  • Page 1 No. 070-6176-00 INSTRUCTION MANUAL roduct Group No. 42 7T11A SAM LING SWEE UNIT lease Check for CHANGE INFORMATION at the Rear of This Manual First Printing JUN 1986 Revised SEP 1986 T ek t ronix COMMTTTED TO EXCELLENCE...
  • Page 2 Tektronix, Inc. All rights reserved. Contents of this publication may not be reproduced in any form without the written permission of Tektronix, Inc. Products of Tektronix, Inc. and its subsidiaries are covered by U.S. and foreign patents and/or pending patents. TEKTRONIX, TEK, SCOPE-MOBILE, and registered trademarks of Tektronix, Inc.

  • Page 3: Table Of Contents

    General Information .............. 2-1 Additional Real-Time Circuits ........Installing the 7T1 1 A in the Oscilloscope ......2-1 Controls Affecting Timing and Delay ......7T11A Horizontal Gain ............2-1 Important Waveform Relationships ....... TIME/DIV Readout .............. 2-4 SEQUENTIAL EQUIVALENT-TIME SAM LING ..
  • Page 4 7T11A Instruction Manual TABLE OF CONTENTS (CONT.) Resistor Color Code ............4-3 SLEWING RAM & RT MULTIVIBRATOR ....3-41 Capacitor Marking......Slewing Ramp Generator ..........3-42 Diodes ....Slewing Ramp Comparator and Semiconductor Lead Configuration ....... Strobe Drivers ..............

  • Page 5: List Of Illustrations

    Effect of lead time in moving display window..3-18 3-14 Random mode block diagram ........3-19 Ideal waveform relationships during Random Simplified block diagram of a sampling system 3-15 equivalent-time sampling ..........3-21 using the 7T11A as a Real-time sweep unit ... .. 3-2...
  • Page 6 Block diagram of the 7T1 1 A trigger circuit ....3-25 4- 9 Connections to Interface assembly A4 ......4-18 3- 19 Simplified 7T11A Trigger Selector circuit showing use of right channel Sampling Unit as source of internal trigger signal ........3-26 5- 1 Typical displays for checking timing accuracy ...
  • Page 7 Sweep Range and Time/Div Settings ......2-9 3- 1 Effect of TIME/DIV Control on Horizontal Amplifier Gain ............... 3-XX46 3- 2 7T11A Readout Switching ..........3-53 4- 1 Relative. Susceptibility to Damage from Static Discharge ................4-2 4- 2 ower Supply Wire Color Code .........

  • Page 8: O Erators Safety Summary

    7T11A Instruction Manual O ERATORS SAFETY SUMMARY The following general safety information applies to all operators and service personnel. Specific warnings and cautions will be found throughout the manual where they apply and should be followed in each instance. WARNING statements identify conditions or practices which could result in personal injury or loss of life.

  • Page 9: Service Safety Summary

    (i.e., trifluorotrichloroethane), such as Freon TF cleaner or Spray-On #2002. Before using any other type of cleaner, consult your Tektronix Service Center or representative. DO NOT USE IN SOCKETS FOR CONNECTION OINTS The spring tension of the pin sockets ensures a good connection between the circuit board and the pin.
  • Page 10 7T11A Instruction Manual 7T11A Sampling Sweep Unit. viii...
  • Page 11 HE FOLLOWING SERVICING INS RUC IONS BY QUALIFIED PERSONNEL ONLY. O AVOID PERSONAL INJURY, DO NO PERFORM ANY SERVICING O HER CON AINED OPERA ING INS RUC IONS UNLESS YOU ARE QUALIFIED O DO SO. REFER O OPERA ORS SAFE Y SUMMARY AND SERVICE SAFE Y SUMMARY PRIOR PERFORMING ANY SERVICE.

  • Page 12: Section 1 - S Ecification

    7000-series oscilloscopes. Several plug-in combinations, in ­ selected. With EXT 50 Ω input selected, the Schmitt circuit cluding a 7T11A, are shown in Fig. 1-1. A 7S11 must be in provides jitter free triggering from input trigger signals from the compartment to the left of, and adjacent to, the com ­...
  • Page 13 VERTICAL MODE HORIZONTAL MODE RIGHT LEFT Left Right "A" "B" 7M11 7S11 7S11 7T11 7S11 7T11 7B - - (B ) 7T11 7S11 7S11 blank 6176-1 Figure 1-1. Several plug-in configurations using the 7T11A and a 7000 — series oscilloscope.
  • Page 14 2.5 times the calibrated speed. fug-in Configuration Mainframe Vertical Modes Left Right Horiz 7T11A 7S11 7S11 LEFT RIGHT Right Horiz Left 7 — 7S11 7T11A RIGHT LEFT 6176-2 Figure 1-2. lug-in configurations using the 7T11A and a three-compartment 7000 — series oscilloscope.
  • Page 15 Specification — 7T1 1 A TABLE 1-1 (cont) ELECTRICAL CHARACTERISTICS Characteristic erformance Requirement TRIGGERING Input Resistance EXT 50 Ω 50 Ω within 10%. EXT 1 MΩ 1 MΩ within 5%. EXT HF SYNC 1 MΩ within 5%. Sinewave Triggering Internal Sensitivity Range X1 Trig Amp 125 mV to 1 V P-P at vertical input (5 kHz to 500 MHz).
  • Page 16 Specification — 7T1 1 A TABLE 1-1 (cont) ELECTRICAL CHARACTERISTICS Characteristic erformance Requirement TRIGGERING (cont) Random Mode 30 ps or less at fastest SWEEP RANGE position (fully CCW); one division or less at remaining six positions of SWEEP RANGE; measurements made under optimum trigger conditions.
  • Page 17 ≈ 15 inches. Aluminum alloy chassis with epoxy laminated circuit boards. Front panel is anodized Construction aluminum. An illustrated list of the accessories supplied with the 7T11A is at the end of the Accessories Mechanical Parts List pullout pages.

  • Page 18: Section 2 - O Erating Instructions

    ­ must be reset each time the 7T11A is transferred between scope. When only one 7T11A and one 7S11 are used in a oscilloscopes, and when a considerable change in ambient 7000-series oscilloscope providing two vertical and two hor ­...
  • Page 19 Operating Instructions — 7T11A 6176-4 Figure 2-2. Front-panel controls, connectors and indicators.
  • Page 20 SWEE CAL Control — A front panel screwdriver adjustment that adjust* horizontal gain to match the oscilloscope deflection factor. Adjusted when switching 7T11A from one oscilloscope to another. TIME OSITION Control — ermits continuously variable adjustment of delay in starting the display, up to the amount indicated in the TIME RNG window.

  • Page 21: Time/Div Readout

    TIME/DIV Readout The 7T11A TIME/DIV setting selected is displayed near the top of the CRT except when the 7T11A is used in a oscilloscope without readout circuitry. The horizontal posi ­ tion of the readout on the CRT corresponds to the horizon ­...

  • Page 22: Setup Rocedure

    1018-00), included as a standard accessory with the 7T1 1 A, must be connected to the 3 mm TRIG INPUT connector on the 7T11A. 2. Insert a 7T11A Sampling Sweep Unit in the “ A ’ hori ­ zontal plug-in compartment. 8. Adjust the mainframe Focus and Intensity, and the 7T1 1 A DC Offset controls for a display similar to that shown 3.

  • Page 23: Observing A Fast Rise Ulse

    TIME POS RNG and TIME/DIV will be unattainable. the delay within different 7T11A ’ s, and the setting of the TRIG LEVEL control. Two other methods of seeing before the triggering point, without the limitations of the method above, are available 4.

  • Page 24: Detailed O Erating Information

    Internal triggering of the 7T1 1 A from the signal applied to either vertical channel is available. Pushing in the INT push ­ button on the 7T11A will cause this button to light. The I NT pushbutton lights on the 7S1 1 that is supplying the trigger ­...

  • Page 25: Swee Range Control

    CW and the Time/Div switch fully CCW. The settings of 50 µs, 20 µs and 10 µs are shown in Table 2-2 to lowest allowable triggering rate for the 7T11A in Random be available at all three real-time positions of the SWEEP mode is 100 Hz;...

  • Page 26: Time Osition Control

    Operating Instructions — 7T11A TABLE 2-2 SWEE RANGE and TIME/DIV Settings Sweep Range TIME OS TIM E /DIV osition and Magnification X2.5 X100 X250 X500 Real Time Fully CW 1 50 ms 5 ms 2 ms 1 ms .5 ms .2 ms .1 ms 50 µ s 20 µ s 10 µ...

  • Page 27: Scan Control

    Operating Instructions — 7T11A Figure 2-7. Effect of TIME OSITION control (SWEE RANGE at 5 µs/div to 10 ns/div position). As mentioned above, turning the SCAN control clock ­ The TIME POSITION control also works during real-time wise increases the scan rate. At faster scan rates the hori ­...

  • Page 28: Trigger Ushbutton Switches

    Operating Instructions — 7T11A Trigger ushbutton Switches The SLOPE pushbuttons permit selection of triggering on either the (+) or (-) stope of the triggering signal. A trigger amplifier is provided and pushing in the X10 pushbutton provides amplification of the input trigger signal.

  • Page 29: Section 3 - Theory Of O Eration

    TTH Converter output voltage changes only 5 volts in 5 ms at the selected position of the SWEEP RANGE con ­ The 7T11A Trigger circuit permits triggering at any de ­ trol. With the SWEEP RANGE and TIME/DIV settings given sired portion of an input signal.

  • Page 30: Staircase Ramp Output Of The Horizontal Memory

    -5 volts is accomplished in 250 steps of 40 milli ­ of the Horizontal Memory only when a memory pulse is ap ­ volts each. Figure 3-1. Simplified block diagram of a sampling system using the 7T11A as a Real-time Sweep Unit.
  • Page 31 ­ gering point being displayed approximately 3 µs after sweep The Real-Time Oscillator, located in the vertical plug-in start. unit, and the Real-Time Multivibrator operate only on the Figure 3-2. 7T11A complete block diagram for Real-time sampling.

  • Page 32: Samples/Division Using Real-Time Sampling

    Theory of Operation — 7T11A of the signal will be displayed approximately 3 µs after sweep start. Unless the sweep repetition rate is very slow, the persistances of the CRT phosphor and the viewers eye result in a display of samples taken during more than one sweep.

  • Page 33: Additional Real-Time Circuits

    SWEEP RANGE, cuit switches the Start Multivibrator circuit, which in turn TIME/DIV, and TIME POSITION. Figure 3-4. Timing relationships during the first 1/5 0 th of one typical Real-time sweep. 7T11A control settings as given in Figure 3-1.

  • Page 34: Controls Affecting Timing And Delay

    SWEE RANGE Control. The Sweep Range control de ­ TIME POSITION control also operates on the Horizontal termines the basic timing of the 7T11A and the available Amplifier block. Essentially the TIME POSITION control de ­ amount of Time Positioning Range. The rate of change, or...

  • Page 35: Important Waveform Relationships

    Theory of Operation — 7T11A Figure 3-5. TTH ramp voltage versus time at the three Real-time positions of the SWEE RANGE control. tive as the strobes arrive. The sweep continues until the While the Output TD is at its high level, the Start output of the Horizontal Amplifier reaches a voltage of ap ­...
  • Page 36 Theory of Operation — 7T11A Figure 3-6. Effect of TIME OSITION and TIME/DIV controls. SWEE RANGE set at 5 ms/div to 10 µs/div position. After an interval of time (1/2 hold-off interval) determined When the D output of the HOMV switches (shown at by the RC previously mentioned, HOMV Sections A, B, C 7.7 ms on Figure 3-7) it causes switching of the Trigger Out ­...
  • Page 37 Theory of Operation — 7T11A Figure 3-7. Ideal Trigger, Sweep, and HOMV waveform relationships during real-time sampling.

  • Page 38: Sequential Equivalent-Time Sam Ling

    Slewing Comparator output also stops the negative-going 7T11A. Comparison of Figure 3-8 with the real-time block TTH ramp. This stopped level is then amplified and read into diagram shown in Figure 3-2 shows that the Reset Compar ­...
  • Page 39 Theory of Operation — 7T11A 3-11...

  • Page 40: Constructing The Display

    Constructing the Display One major difference between real-time and equivalent ­ time sampling in the 7T11A is the manner in which the dis ­ Waveform Relationships play is constructed on the CRT. During real-time operation many samples of the vertical input signal are normally taken Figure 3-9 shows ideal waveform relationships for se ­...
  • Page 41 Theory of Operation — 7T11A Figure 3-9. Ideal waveform relationships during sequential equivalent-time sampling. 3-13...
  • Page 42 Theory of Operation — 7T11A After an interval of time determined by an RC circuit in Turning the TIME POSITION control fully CCW affects the HOMV, the A output of the HOMV switches to a more the waveforms (of Figure 3-9) as shown in Figure 3-10. With positive level.

  • Page 43: Factors Affecting Dot Density

    Theory of Operation — 7T11A Factors Affecting Dot Density Blanking On the three fastest equivalent-time sweep ranges, the Four types of blanking are used in the 7T11A. Inputs to µS. triggering interval can be no less than about 25 As the the blanking circuits are provided via the interface connector trigger repetition rate is reduced so that the interval be ­...
  • Page 44 Theory of Operation — 7T11A Figure 3-11. 7T11A Blanking Logic. 3-16...

  • Page 45: Unavoidable Delay Introduced By The 7T11A

    7T11A to the Vertical Unit and thence to the sampling bridge. If the sampling head is operating on an Seeing before the triggering point is possible when using...

  • Page 46: Random Mode Block Diagram

    Theory of Operation — 7T11A interval (see Figure 3-14). These two inputs are a reset pulse delivered by the HOMV (at 1/2 hold-off interval after T o ), and an input delivered by the Trigger circuit at time T o .
  • Page 47 Theory of Operation — 7T11A 3-19...

  • Page 48: Waveform Relationships During Random Sampling

    Theory of Operation — 7T11A strobe possible after a start pulse has been received, the ing Comparator, which will deliver an output (strobe pulse) Slow Ramp Inverter output is set as close to zero as when the two ramps reach the same level. Although the possible.
  • Page 49 Theory of Operation — 7T11A pulse is fed to the T o Gate of the Ratemeter. When the The waveform shown as the Ratemeter Input in Figure 3 ­ Trigger Output TD switches back to its low level, the nega ­...

  • Page 50: Detailed Circuit Descri Tion

    Relationships Between the 7T11A and Vertical Unit Figure 3-17 shows the relationship between circuits in the 7T11A Sampling Sweep Unit and a Sampling Unit lo ­ cated in the adjacent vertical compartment of a 7000-Series oscilloscope. Designations of RT are used in Figure 3-17 to indicate switch positions during Real-Time operation.
  • Page 51 Theory of Operation — 7T11A 3-23...

  • Page 52: Trigger In Ut

    Sampling Unit plug-ins can be abled by effectively grounding the shield of the coaxial cable fed to the 7T11A. This signal is carried between the adja ­ between the right-hand vertical plug-in and the 7T11A. The cent vertical plug-in and the 7T1 1 A through contact 2 or 8 of Real-Time Oscillator is disabled when the line labeled ‘...

  • Page 53: Ext 50 Q Triggering

    Trigger Slope Amplifier. The other set of contacts When the EXT 1 MΩ pushbutton is pushed in, the 1 MEG on the 7T11A INT trigger switch provide a ground to the AMP is inserted between the TRIG INPUT connector and multivibrator and trigger logic circuits in both Sampling the input of the Trigger Slope Amplifier.

  • Page 54: Hf Sync

    CR28, and 10 MHz tunnel diode CR29. used as a coarse sync control during HF SYNC operation. Figure 3-19. Simplified 7T11A Trigger Selector circuit showing use of right channel Sampling Unit as source of internal trigger signal. 3-26...
  • Page 55 Theory of Operation — 7T11A Rotating the TRIG LEVEL control causes a slight change in The output of CR28 is counted down by a factor of about the bias of the 200 MHz tunnel diode oscillator. During HF 20 to 1 by 10 MHz tunnel diode oscillator CR29. Sync SYNC operation the TRIG LEVEL control functions as a fine Countdown adjustment R30 is used to set the bias and fre ­...

  • Page 56: Trigger Slope Amplifier, Slo E (-) Or (+)

    Q62 and Q72 are connected as a differential ampli ­ fier. With the TRIG LEVEL control set to mid-position, and When the 7T11A HF SYNC pushbutton is in the out posi ­ no input trigger, current through each transistor is about tion both tunnel diode oscillators are disabled.

  • Page 57: Trigger & Holdoff

    R132 and tunnel diode current is again re ­ turned to the value indicated by point 1. The output of the The Schmitt trigger circuit used in the 7T11A provides a Schmitt Trigger circuit is fed to Arming and Output TD's hysterisis band that can be made very narrow (around 1 CR142 and CR152.

  • Page 58: Holdoff Multivibrator (Homv)

    Theory of Operation — 7T11A Hold-Off Multivibrator (HOMV) The four gates are divided into two sets. Each set is con ­ nected as a DC coupled multivibrator. The first set is formed The HOMV is responsible for supplying signals at the using the gates designated A and B and having terminals, 1, proper time to several different circuits.

  • Page 59: Real-Time Homv Switching

    Theory of Operation — 7T11A C output (pin 8) will be +4 volts however, when Gate A Each of the gates has the following characteristics: output is 0 volts, since pin 10 is kept below the +0.8 volt When both inputs are above +2 volts, the output is at 0 level by input current supplied through R108 and CR106.
  • Page 60 Q184 is delivered, by way of Q186, to the PULSE four types of blanking can produce blanking unless Q196 is OUT connector on the 7T11A front panel. The negative turned on. Real-Time Retrace blanking is disabled at this pulse at the collector of Q174 occurs when Output tunnel time due to conduction of Q234 in the Start Multivibrator.

  • Page 61: Equivalent-Time Homv Switching

    Theory of Operation — 7T11A quiescent state. The Arming and Output tunnel diodes re ­ Another output occurs as a result of the conduction of ceive bias and the cycle is to repeat when another trigger is Q174 at time T o . The voltage at the junction of R174 and recognized.
  • Page 62 Theory of Operation — 7T11A Figure 3-25. Trigger, Sweep, and HOMV waveform relationships during real-time sampling. 3-34...
  • Page 63 Theory of Operation — 7T11A Figure 3-28. Typical waveform relationships during sequential equivalent-time sampling. 3-35...

  • Page 64: Arming And Output Tunnel Diodes

    Theory of Operation — 7T11A +1.5 volts required to cause switching of Gates C and D. In any mode other than HF SYNC the Schmitt Trigger The requirement that both Gate inputs be positive to get a circuit supplies the triggering signal to the Arming and Out ­...

  • Page 65: Time To Height Converter

    Theory of Operation — 7T11A Q164 shuts off and Q162 turns on. Turning on Q162 sends a fast current pulse to Q212 and thence to Q230 of the TIME TO HEIGHT CONVERTER Start Multivibrator. The Start Multivibrator then starts the TTH Ramp (Diagram 3, TIME TO HEIGHT CONVERTER).

  • Page 66: Tth Circuit

    The Time to Height Converter is the key timing circuit in Slope Drive since the (+) Slope Driver is always off during the 7T11A. It is essentially a Miller integrator formed by these modes of operation. The same logic that causes Q222...
  • Page 67 Theory of Operation — 7T11A When Q234 turns on, a negative pulse is developed at its CR152 recognizes a trigger and switches to its high level, a collector. The negative pulse from Q234 is fed through negative pulse is delivered from the collector of Q216 to the CR244 to the Slewing Ramp and to the gate of Q294.
  • Page 68 Theory of Operation — 7T11A supply and Q262 provide input current to drive the Miler The path for (-) Slope Drive current when developing a output negative. The -50 volt supply and Q272 provide an negative-going TTH Converter output is shown in Figure 3- input current in the opposite direction and cause a positive ­...

  • Page 69: Slewing Ram & Rt Multivibrator

    Theory of Operation — 7T11A C264 acts as a temporary charge storage device preventing piing. The (-) Stop signal is provided by Slewing Ramp the input of the TTH Converter from moving until the ampli ­ Comparator transistor Q328 (Diagram 4).

  • Page 70: Slewing Ramp Generator

    Theory of Operation — 7T11A The parallel combination of C312 and C313 is used on Slewing Ramp Generator the fastest sweep range. 50 ns Slewing adjustment C313 The switching of Output TD CR152 (Diagram 2) to its sets the Slewing Ramp slope equal to that of the TTH ramp high level causes the output of Q162 to go negative.

  • Page 71: Real-Time Multivibrator

    Theory of Operation — 7T11A of Q368. This enables Q368 and provides Interdot blanking Slow Ramp Inverter to the base of Q316. When Q316 and for a 3 µs interval. Q318 turn on, Q322 turns on, causing transistor Q328 to switch to its high state.

  • Page 72: Retrigger Comparator

    Theory of Operation — 7T11A After the network reaches the -5 volt level, C4 12 retrigger Comparator charges toward -10 volts from 0 volts with a time constant Pretrigger Comparator Q414-Q416 is responsible for of C412 (R412 + parallel resistance of R411, R408, and delivering an output, from the collector of Q416 to the base R409) or approximately 800 µs .

  • Page 73: Start Correction

    Theory of Operation — 7T11A When the T o Gate transistors are turned on, the T o Mem ­ If the triggering interval is very random, it is possible for ory capacitor C421 is connected to the Ratemeter Ramp trigger recognition to occur part of the time prior to network through the low resistance of the Gate transistors.

  • Page 74: Horizontal Am Lifier

    Theory of Operation — 7T11A stages aid in locating components mentioned here. Sub ­ The four inputs are from Rate Servo Zero adjustment -headings in the following discussion use these stage names R440, TTH Converter output (Diagram 3), Slow Ramp In ­...

  • Page 75: Horizontal Memory Gate Driver

    Theory of Operation — 7T11A R541 drops to -0.6 volts. This voltage shuts off Q544 and Time positioning current is injected at the input of U512A saturates Q542. The base input of Q546 is now grounded to offset the dynamic range of the amplifier. See Figure 3- and the emitter is not.

  • Page 76: Slow Ram Generator & Out Ut Am Lifier

    Theory of Operation — 7T11A Amplifier and feedback resistor R558 are disconnected from Turning the SCAN control CCW reduces the input cur ­ the input. Memory capacitor C566 retains the final voltage rent to the Miller circuit and therefore reduces the slope of reached by the amplifier until the next strobe occurs.

  • Page 77: Blanking

    Theory of Operation — 7T11A Transistor Q628 is switched off by the conduction of re ­ Slow Ramp Retrace blanking is disabled or inhibited by set transistor Q634. Although resistor Q634 shuts off al ­ turning on Q662. As previously mentioned, Q662 is turned...

  • Page 78: Man And Ext In Ut Scan

    ’ s control logic through interface connectors B7 of A16. This ensures that the 7T11A can only cause When the MAN SCAN pushbutton is pushed in, Q616 CRT blanking during its alloted display time.

  • Page 79: Dot Osition Memory

    Theory of Operation — 7T11A When the Trigger Output TD (Diagram 2) switches to its as a high impedance voltage follower. The output voltage of low level at 1/2 hold-off interval, a negative-going pulse is U602 still appears across the SCAN potentiometer R610.

  • Page 80: Slow Ram Inverter

    Theory of Oporation — 7T11A Slow Ramp Inverter < 8 > SLOW RAM INVERTER The output of the Slow Ramp Inverter is fed to the base of 0434 (Diagram 5) and Q316 (Diagram 4). With the refer ­ A schematic diagram of the Slow Ramp Inverter circuit is...

  • Page 81: General

    Theory of Operation — 7T11A These stages aid in locating components mentioned here. With the SWEEP RANGE switch at its fully clockwise Sub-headings in the following discussion use these stage position and the TIME/DIV switch set fully counterclock ­ names to further identify portions of the circuitry on Diagram wise, the CRT readout is 5 ms.

  • Page 82: Voltage Distribution & Decou Ling

    0.4 mA passes through R765. These values of current cause the symbol for second (s) to be selected. For more specific information on the readout circuitry, refer to the instruction manual for your Tektronix 7000-se- ries oscilloscope. 3-54...

  • Page 83: Section 4 - Maintenance

    Preventive maintenance consists of cleaning, visual inspection, lubrication, etc. Preventive maintenance performed on a regular basis will improve the reliability of this instrument. The severity of the environment to which the 7T11A is subjected determines the frequency of maintenance. A convenient time to perform preventive maintenance is preceding electrical adjust ­...

  • Page 84: Troubleshooting

    Maintenance — 7T1 1 A TROUBLESHOOTING The following information is provided to facilitate troubleshooting of the 7T11A. Information contained in other sec ­ tions of this manual should be used along with the following information to aid in locating a defective component. An understanding of circuit operation is very helpful in locating trouble.

  • Page 85: Wiring Color Code

    Wiring Color Code Multi- in Connector Identification All insultated wire and cable used in the 7T11A is color Multi-pin connectors mate with groups of pins soldered coded to facilitate circuit tracing. Table 4-2 gives the wiring to circuit boards. Pin number 1 is indexed with a triangular color code used in the 7T11A.
  • Page 86 Maintenance — 7T11A COLOR CODE 1 2 and 3 - 1ST, 2ND, AND 3RD SIGNI FICANT FIGS. ( T ) AND/OR (TC) COLOR CODE MAY NOT MULTIPLIER (T). TOLERANCE; BE PRESENT ON SOME CAPACITORS; (TC) - TEMPERATURE COEFFICIENT. (P). POLARITY AND VOLTAGE RATING...
  • Page 87 Maintenance — 7T1 1 A NOTE LEAD CONFIGURATIONS AND CASE STYLES ARE TYPICAL, BUT MAY VARY DUE TO VENDOR CHANGES OR INSTRUMENT MODIFICATIONS. 6176-47 Figure 4-2. Semiconductor teed configuration.

  • Page 88: Troubleshooting Techniques

    Section 2, Operat ­ ing Instructions. 2. Check Associated Equipment Before proceeding with troubleshooting of the 7T11A, check that the indicator oscilloscope and equipment used with this instrument are operating correctly. Check that the Figure 4-3.

  • Page 89: Check Voltage And Waveforms

    High currents may damage the diode. 7. Check Individual Components The following procedures describe methods of checking individual components in the 7T11A. Components that are soldered in place are best checked by first disconnecting Resistors. Check resistors with an ohmmeter. See Sec ­...

  • Page 90: Troubleshooting Rocedure

    TROUBLESHOOTING ROCEDURE Voltage to INT coil A3K32: +5 V If the 7T11A is operating well except for certain settings EXT 50 Ω Voltage to EXT 50 Ω coil A3K31 : of one or two controls, then troubleshooting can usually be...
  • Page 91 Maintenance — 7T1 1 A h. Strobe Drivers — To get an output, return the collector 11. Check Trig Level Zero. Set the STABILITY control of A2Q342 to ground through a resistor (100 Ω to 1 k). for free running within a narrow band. The Schmitt Trigger circuit should still free run within this narrow band when + or —...

  • Page 92: Corrective Maintenance

    In addition to standard electronic components, some special components are used in the 7T11A. These compo ­ Circuit Boards nents are manufactured or selected by Tektronix, Inc. to meet specific performance requirements, or are manufac ­...

  • Page 93: Metal Terminals

    Insert the leads into the holes in the boards so instrument, remove the 7T11A from the oscilloscope the component is firmly seated against the board, or as po ­...

  • Page 94: Circuit Board In Replacement

    Replaceable Mechanical Parts List in Section 9. An alterna ­ tive solution is to refer the replacement of the defective con ­ nector to your local Tektronix Field Office or representative. Multiple End-Lead Connector Replacement Some of the pin connectors are grouped together and mounted in a plastic holder;...

  • Page 95: Tunnel Diode A3Cr28 Replacement

    R28 from the tunnel diode lead. your local Tektronix Field Office or representative. Determine the cathode side of the new tunnel diode be ­ Cam Switch. The cam switch (TIME/DIV and SWEEP fore soldering R28 to the tunnel diode lead.
  • Page 96 Maintenance — 7T1 1 A Oscillator min. freq. 6176-52 Figure 4-7. Minimum range required for the 200 MHz oscillator. 4-14...

  • Page 97: Lamp Replacement

    7. To re-install the switch assembly, reverse the above If the Tektronix instrument is to be shipped to a procedure. Tektronix Service Center for service or repair, attach a tag...
  • Page 98 Maintenance — 7T1 1 A Lamp Black, brown on white: A2Q724 collector ( + ) Brown, orange on white: connector A9 (+5V L) Black-red: connector A8 (+5V) Black, yellow on white: A3 136 pin 2 Green-white: A3 136 pin 1 (A) A8-Slope Switch circuit board assembly.
  • Page 99 Maintenance — 7T1 1 A (X1) Black-red: connector A8 (+5V) Black-red: connector AS (+5V) Black, grey on white: A3 13S pin 3 (X10) Orange-brown: connector A9(+5V L) Black, brown on white: A2Q724 collector (D) A5-Trigger Amplifier Switch circuit board assembly. Green-white: A10J641 pin 5 Red, blue on white: A3 129 pin 1 Red, violet on white: A3 129 pin 2...
  • Page 100 Maintenance — 7T11A Red-Green on White Red-Blue on White Red-Orange on White Brown- Violet Black-Blue on White Red-Violet on White Grey-White Black-Orange on White (coax) Brown-White Blue-White Red-Grey on White Black-Violet on White B la ck-Grey on White B la ck-Red on White...

  • Page 101: Section 5 - Checks And Adjustment

    In this procedure, capital letters within the body of text identify front-panel controls, indicators and connectors on Using These rocedures the 7T11A (e.g., SCAN). Initial capital letters identify con ­ trols, indicators, and connectors (e.g., Position) on associ ­ Both Part I —...

  • Page 102: Artial Rocedures

    Checks «nd Adjustment — 7T11A 3. Perform the Setup Conditions instructions for the de ­ 2. CHECK — indicates that the instruction accomplishes sired step. Disregard any control settings which are the an electrical specification check. Each electrical specification same as those under Preiimanary Control Settings.
  • Page 103 Checks and Adjustment — 7T11 A TABLE 5-1 erformance Check Summary Steps containing adjustments are indicated by an asterisk. art II — erformance art 1- erformance Check and Characteristic Check Steps Adjustment Steps Time/Div B6*,B7* Timing Variable Triggering Sensitivity and Frequency Range Internal B2, B3, B4...

  • Page 104: Adjustment Interval

    These fixtures are available from Tektronix Field Offices or quently. Before complete adjustment, thoroughly clean and representatives. inspect the 7T11A as outlined in Section 4, Maintenance. Tektronix Field Service Test Equipment Alternatives Tektronix Field Service Centers and the Factory Service All the listed test equipment is required to completely Center provide instrument repair and adjustment services.
  • Page 105 2. Sampling Unit Tektronix 7000-Series; Accepts Sampling Head and Tektronix 7S11. compatible with S-Series interconnects with 7T11A to Sampling Heads and 7T11A. provide vertical portion of sampling system. 3. Sampling Head Tektronix S-Series; 50 Ω Provides vertical signal input Tektronix S-1 for checking input impedance;...
  • Page 106 Checks and Adjustment — 7T11A TABLE 5-2 (cont) Test Equipment Examples of Applicable Test Equipment Description Minimum Specifications urpose Signal source for checking HF Hewlett Packard 626A. 12. SHF Signal Generator 12.4 GHz; 200 - 500 mV SYNC triggering. variable output voltage.
  • Page 107 Minimum Specifications urpose Test Equipment 25. GR Power Divider GR connectors; 50 Ω tee Provides dual signal path Tektronix Part No. impedance when two legs are when checking external 017-0082-00. triggers and display jitter. terminated in 50 Ω. Signal splitting for checking Tektronix Part No.

  • Page 108: Erformance Check Index

    B7. CHECK RANDOM-MODE DISPLAY stalled) in the right vertical compartment of the Oscilloscope JITTER AT FASTEST SWEEP RANGE Mainframe and the 7T11A in the A horizontal compartment. POSITION ............5-19 B8. CHECK DISPLAY JITTER AT REMAINING SWEEP RANGE POSITIONS ......5-20 B9.

  • Page 109: Scan And Timing

    Sampling Unit DC Offset ......Midrange Units/Div ........NOTE The 7T11A SWEE RANGE control and TIME OS Oscilloscope Mainframe RNG display window are Integral features. In this pro ­ cedure, SWEE RANGE settings are indicated by the Vertical Mode ............

  • Page 110: A2. Check Timing

    50 µS 5 µS ’ 5 µS 1 marker/div 1 marker/div 50 µS 2 µS 2 µS a. Set 7T11A TRIG LEVEL for a free running sweep. 1 marker/div 50 µS 1 µS 1 µS 1 marker/div 50 µS .5 µS .5 µS...
  • Page 111 Checks and Adjustment — 7T11 A art I — erformance Check Figure 5-1. Typical displays for checking timing accuracy. 5-11...

  • Page 112: A3. Check Repetitive Scan Rate

    CHECK — the display for 25 ms or less per sawtooth (see Figure 5-2). b. Set the Time Base Time/Div to .1 s and set 7T11A SCAN to full counterclockwise. c. CHECK — the display for 500 ms or more per sawtooth.

  • Page 113: A5. Check Ext Input

    CHECK — for a dot on the display, positioned near the right graticule edge. b. Set the Differential Comparator + Input to DC. b. Press in the 7T11A EXT INPUT pushbutton. Connect Sampling Unit Offset Out to 7T1 1 A EXT INPUT with a patch cord.

  • Page 114: Triggering

    Board Illustrations. Polarity ..............+ Up Normal/Smooth ............ Normal NOTE The 7T11A SWEE RANGE control and TIME OS Oscilloscope Mainframe RNG display window are integral features. In this pro ­ cedure, SWEE RANGE settings are identified by the Vertical Mode ..........

  • Page 115: B2. Check Low-Frequency Triggering

    Display Size in Table 5-5 to obtain a stable, triggered display. The signal column. Add a 10X BNC Attenuator to the 7T11A trigger generator output amplitude is correct when its signal causes signal as indicated in the right-hand column of Table 5-4.
  • Page 116 Checks and Adjustment — 7T11 A art I — erformance Check TABLE 5-4 Low-Frequency Triggering 7T11A SAM LING TRIGGERING UNIT SWEE TIME/ TRIG TRIG GENERATOR GENERATOR DIS LAY 10X ATTENUATOR UNITS/DIV FREQUENCY OUT UT SIZE MODE RANGE MODE INTERNAL 5 ms .1 ms...

  • Page 117: B4. Check High-Frequency Triggering

    LEVEL controls along with the signal generator Amplitude amount of vertical deflection shown under the Display Size column. Set 7T11A STABILIY and TRIG LEVEL as neces ­ control. sary for a stable display. Add BNC Attenuators to the 7T11A trigger input signal or Sampling Unit signal input as indicated in the right-hand column of Table 5-6.

  • Page 118: Art I - Erformance Check

    Checks and Adjustment — 7T11 A art I — erformance Check B6. CHECK SEQUENTIAL-MODE DIS LAY JITTER c. Set the Sampling Unit Units/Div to 2 and use DC Off ­ set and 7T11A TIME POSITION to keep the pulse leading AT FASTEST SWEE RANGE OSITION edge visible.

  • Page 119: B7. Check Random-Mode Display Jitter At Fastest Sweep Range Position

    Test Equipment Controls: No change in settings from previous step. 6176-82 a. Set 7T11A TRIG LEVEL, if necessary for a display such as that shown in Figure 5-3A. b. Rotate the TIME/DIV control clockwise to .2 ns, one step at a time, while using TIME POSITION, STABILITY, and TRIG LEVEL to maintain best possible display stability of the pulse leading edge.

  • Page 120: B8. Check Display Jitter At Remaining Sweep Range Positions

    OSITIONS adjust 7T11A STABILITY and TRIG LEVEL for minimum NOTE jitter before a measurement is made. Press the 7T11A REP pushbutton in when checking Sequential mode operation If the previous step was not performed, first perform and the MAN pushbutton in when checking Random mode.

  • Page 121: B9. Check Hf Sync Display Jitter

    Set the signal generator Amplitude and Sampling Unit Units/Div controls to provide at least 200 mV of trigger sig ­ nal to the 7T11A and display a steep enough waveform b. CHECK — the display for at least 400 mV of signal am ­...

  • Page 122: B11. Check Trigger Kick Out

    Install a Sampling Head having less than 2 mV of dis ­ play noise in the Sampling Unit. Connect the Sampling Head input to the 7T11A EXT TRIG INPUT. b. Set Sampling Unit DC Offset to position the trace at graticule center.

  • Page 123: B12. Check Minimum Trigger Rate In Random Mode

    RANDOM MODE NOTE If the previous step was not performed, first perform step B1. B12. SETU CONDITIONS 7T11A Controls: SWEE RANGE ..............50 µS TIME/DIV ..................5 µs EXT 50 Ω 2 V MAX pushbutton ........ressed in TRIG LEVEL ............
  • Page 124 Checks and Adjustment — 7T11A PART ll-PERFORMANCE CHECK AND ADJUSTMENT The following procedure (Part ll-Performance Check and Adjustment) provides the information necessary to: (1) verify that the instrument meets the electrical specifications, (2) verify that all controls function properly, and (3) perform all internal adjustments.

  • Page 125: Art Ii - Erformance Check And Adjustment

    Tape the loose connectors to the chassis to avoid a short circuit. This completes oscillator control and strobe drive circuits so the 7T11A can be operated on a plug-in extender. Position the EXT TRIG INPUT cable and connec ­...

  • Page 126: Trigger Adjustments

    NOTE DC Offset ... Centered display Units/Div ................ 200 The 7T11A SWEE RANGE control and TIME OS Dot Response ............ Midrange RNG display window are integral features. In this pro ­ Normal pushbutton ....Pressed in cedure, SWEE RANGE settings are indicated by the value appearing in the TIME OS RNG window.

  • Page 127: A2. Examine/Adjust +10 Volts

    Set 7T11A SLOPE to (-). instrument operation. They are not to be considered specifications. c. Set 7T11A TRIG LEVEL for a free-running sweep. Note the position of the TRIG LEVEL control. b. EXAMINE — the Comparator display for a reading of + 10.00 volts at TP602.

  • Page 128: A4. Examine/Adjust Arming Bias

    If any adjust ­ ment is made, it is recommended that the remainder of this a. Set 7T11A TIME POSITION and TRIG LEVEL (if nec ­ procedure subsection be performed and the entire subsec ­...

  • Page 129: A5. Examine Trig Level And Stability Control Operation

    II — erformance Check and Adjustment A5. EXAMINE TRIG LEVEL AND STABILITY c. EXAMINE — pulse leading edge for stability (no jitter). 7T11A sweep speed may be increased to better view small CONTROL O ERATION amounts of jitter. NOTE If the previous step was not performed, first perform d.

  • Page 130: A6. Examine/Adjust External Trigger Zero

    A6. EXAMINE/ADJUST EXTERNAL TRIGGER the oscilloscope display. ZERO (A3R80, A3R45) c. Press in the 7T11A EXT 1 MΩ pushbutton and con ­ NOTE nect the X1 probe to the junction of R53-R56 on Trigger If the previous step was not performed, first perform Board assembly A3.

  • Page 131: Scan And Timing

    Sampling Unit DC Offset ............Midrange Units/Div ........NOTE The 7T11A SWEE RANGE control and TIME OS Oscilloscope Mainframe RNG display window are integral features. In this pro ­ cedure, SWEE RANGE settings are identified by the Vertical Mode ............

  • Page 132: B2. Examine/Adjust Memory Gate Blowby

    Checks and Adjustment — 7T11A art II — erformance Check and Adjustment a. Set 7T11A SCAN to center the Differential Compara ­ B2. EXAMINE/ADJUST MEMORY GATE BLOWBY tor trace on the oscilloscope display. (A2R550) NOTE NOTE These values are provided only as examples of typical First perform step Bl, then proceed.

  • Page 133: B3. Adjust Slewing Ramp, Servo Zero, Dot Position Memory, And Rate Servo Zero

    TIME/DIV ..................5 µS pushbutton ............. ressed in e. Press in the 7T11A MAN pushbutton and set SCAN to full counterclockwise. f. ADJUST — Dot Position Memory adjustment R645 (on Logic board assembly A1) for an unblanked dot on the oscil ­...

  • Page 134: B4. Examine Position And Sweep Cal Range

    EXAMINE — dot movement on the display to be at B4. EXAMINE OSITION AND SWEE CAL RANGE least + and — 0.6 division from graticule center when 7T11A POSITION is rotated from full counterclockwise to NOTE full clockwise. If the previous step was not performed, first perform step B1.

  • Page 135: B5. Examine/Adjust Real Time Zero And Memory Gate Bal

    II — erformance Check and Adjustment e. Connect 50 ms time marks to the Sampling Head and B5. EXAMINE/ADJUST REAL TIME ZERO AND the Time Mark Generator trigger output to the 7T11A EXT MEMORY GATE BAL (A2R500, A2R550) TRIG INPUT connector.

  • Page 136: B6. Check/Adjust Timing

    ADJUST — Fast Timing adjustment R260 (on Timing board assembly A2) for one time mark per division. NOTE k. Set 7T11A SWEEP RANGE to 50 ns and the Time If the previous step was not performed, first perform Mark Generator to 10 ns.
  • Page 137 Checks and Adjustment — 7T11A art II - erformance Check and Adjustment t. Set 7T11A VARIABLE (CAL IN) to Variable by press ­ p. Set 7T11A SWEEP RANGE to 50 µS . ing in the knob to release it. q. ADJUST — Servo Zero adjustment R588 (on Logic u.

  • Page 138: B7. Examine/Adjust Random Timing

    Oscilloscope Mainframe Vertical Mode ......Right Horizontal Mode ..............6176-93 a. Set 7T11A TRIG LEVEL to stabilize the display as much as possible. NOTE These values are provided only as examples of typical instrument operation. They are not to be considered specifications.

  • Page 139: B8. Check Repetitive Scan Rate

    CHECK — the display for 25 ms or less per sawtooth center the sweep on the display. (see Figure 5-11). b. Set the Time Base Time/Div to .1 s and set 7T11A SCAN to full counterclockwise. b. Set the Differential Comparator + Input to DC.

  • Page 140: B10. Examine/Adjust Sync Countdown

    Checks and Adjustment — 7T11A art II — erformance Check and Adjustment c. ADJUST — Sync Countdown adjustment R30 for a B10. EXAMINE/ADJUST SYNC COUNTDOWN 10 MHz repetition rate on the oscilloscope display. (A3R30) d. INTERACTION — Adjustments described in this sub ­...
  • Page 141 If the previous step was not performed, first perform ation as described in parts a through d. step B1. f. Set 7T11A TIME/DIV to 5 ns, TIME POSITION to full clockwise, and the SEQUENTIAL pushbutton pressed in. B11. SETU CONDITIONS g.

  • Page 142: B12. Check Ext Input

    EXAMINE — the display for a dot near the right grati ­ cule edge. b. Press in the 7T11A EXT INPUT pushbutton. Connect theSampling Unit Offset Out to 7T11A EXT INPUT 1 V/DIV 100 kΩ with a patch cord. c. Set Sampling Unit Offset to position the dot at the right edge of the graticule.

  • Page 143: Trigger O Eration

    Polarity ......+ Up Normal/Smooth ......Normal NOTE The 7T11A SWEE RANGE control and TIME OS Oscilloscope Mainframe RNG window are integral features. In this procedure, SWEE RANGE settings are indicated by the value Vertical Mode ............Right displayed in the TIME OS RNG window.

  • Page 144: C2. Check Low-Frequency Triggering

    CHECK — 7T11A medium-frequency triggering ca ­ column. Add a 10X BNC Attenuator to the 7T11A trigger pability by using the control settings and requirements given signal as indicated in the right-hand column of Table 5-9.
  • Page 145 Checks and Adjustment — 7T11A art II — erformance Check and Adjustment TABLE 5-9 Low-Frequency Triggering 7T11A SAM LING UNIT TIME/ GENERATOR DIS LAY 10X ATTENUATOR TRIGGERING SWEE TRIG TRIG GENERATOR FREQUENCY OUT UT SIZE MODE UNITS/DIV RANGE MODE INTERNAL 5 ms .1 ms...

  • Page 146: C4. Check High-Frequency Triggering

    Ta ­ a. CHECK — that a stable, triggered waveform providing 200 mV of trigger signal to the 7T11A can be obtained on ble 5-11 to obtain a stable, triggered display. The...

  • Page 147: C6. Check Sequential-Mode Display Jitter At Fastest Sweep Range Position

    Units/Div ..... Normal/Smooth .. ulse Generator a. Set 7T11A TRIG LEVEL, if necessary, for a display such as that shown in Figure 5-13A. b. Rotate the TIME/DIV control clockwise to .2 ns, one step at a time, while using TIME POSITION, STABILITY, and TRIG LEVEL to maintain best possible display stability of the pulse leading edge.

  • Page 148: C7. Check Random-Mode Display Jitter At Fastest Sweep Range Position

    Test Equipment Controls: No change in settings from previous step. 6176-109 a. Set 7T11A TRIG LEVEL, if necessary, for a display such as that shown in Figure 5-1 3A. b. Rotate the TIME/DIV control clockwise to .2 ns, one step at a time, while using TIME POSITION, STABILITY, and TRIG LEVEL to maintain best possible display stability of the pulse leading edge.

  • Page 149: C8. Check Display Jitter At Remaining Sweep Range Positions

    SEQENTIAL pushbutton ..........ressed in adjust 7T11A STABILITY and TRIG LEVEL for minimum SWEE RANGE ................. 5 µS jitter before measurement is made. Press the 7T11A REP TIME/DIV ......... 1 ns pushbutton in when checking Sequential mode operation RE pushbutton .....

  • Page 150: C9. Check Hf Sync Display Jitter

    Set the Generator Amplitude and Sampling Unit Units/Div controls to provide at least 200 mV of trigger sig ­ nal to the 7T11A and display a steep enough waveform slope to accurately measure jitter. a. Obtain a free-running sweep by setting 7T11A STA ­...

  • Page 151: C11. Check Pulse Out Into 50 Ω

    DC Offset ............Centered display Units/Div ................Normal/Smooth ............. Normal a. Rotate 7T11A TIME POSITION counterclockwise to display the rising portion of the pulse. b. CHECK — the display for at least 400 mV of signal am ­ plitude (see Figure 5-1 4A).

  • Page 152: C12. Check Trigger Kick Out

    Checks and Adjustment — 7T11A art II- erformance Check and Adjustment C12. CHECK TRIGGER KICK OUT c. CHECK — the trigger lockout pulse to be no more than ±2 mV (see Figure 5-15). NOTE d. Replace the Sampling Head with the one previously If the previous step was not performed, first perform used.

  • Page 153: C14. Examine Strobe Kickback Into Trigger

    Horizontal Mode ......Sampling Unit Units/Div .................. Figur« 5*18. Trigger holdoff measurement. a. Set the Sine Wave Generator amplitude and 7T11A TRIG LEVEL for a stable display with 5 divisions of amplitude. b. EXAMINE — the displayed waveform for any disconti ­...

  • Page 154: C15. Check Minimum Trigger Rate In Random Mode

    C15. CHECK MINIMUM TRIGGER RATE IN RANDOM MODE NOTE If the previous step was not performed, first perform step C1. C15. SETU CONDITIONS 7T11A Controls: SWEE RANGE ..............50 µS TIME/DIV ..................5 µs EXT 50 0 2 V MAX pushbutton ........ressed in TRIG LEVEL ............

  • Page 155: Section 6 - Instrument O Tions

    Section 6-7T11A SECTION 6 INSTRUMENT O TIONS No options were available for the 7T1 1 A at the time of this printing. Information about any subsequent options will be included in the CHANGE INFORMATION section at the rear of this...
  • Page 156 If a part you have ordered has been replaced with a new or assemblies and parts). improved part, your local Tektronix, Inc. Field Office or represen ­ tative will contact you concerning any change in part number. Chassis-mounted parts have no assembly number prefix and are located at the end of the Electrical arts List.
  • Page 157 Replaceable Electrical arts - 7T11A CROSS INDEX - MFR. CODE NUMBER TO MANUFACTURER Mfr. City. State. ZiD Code Code Manufacturer Address ICKENS SC 29671 SANGAMO NESTON INC SANGAMO RO 00853 0 BOX 128 SANGAMO CA ACITOR OIV 1201 SOUTH 2N0 ST...
  • Page 158 COM TON CA 90224 BELL INDUSTRIES INC MILLER J M DIV 19070 REYES AVE 76493 0 BOX 5825 BEAVERTON OR 97077 TEKTRONIX INC 4900 S M GRIFFITH OR 80009 O B 0X 500 CHICAGO IL 60646 4242 BYRN MAHR AVE M...
  • Page 159 Replaceable Electrical arts - 7T11A Mfr. Tektronix Serial/Assembly No. Component No. Name & Description Code Mfr . art No . art No. Effective Dscont 80009 670-1118-09 670-1118-09 CIRCUIT 80 OSSYzUDGIC 80009 670-1119-14 670-1119-14 CIRCUIT 80 OSSYzTIMING CIRCUIT 80 OSSYzTRIGGER 80009...
  • Page 160 Replaceable Electrical arts - 7111 A Mfr. Tektronix Serial/Assembly No. Code Mfr. art No. Effective Dscont Name A Description Component No. art No. 04713 S F3036 TRANSISTOR:FET,N-CHAN,SI,T0-92 A1 Q 620 151-1025-00 S S6917 TRANSISTOR:N N,SI JO-92 04713 A1Q626 151-0224-00 80009...
  • Page 161 Replaceable Electrical arts - 7T11A Mfr. Tektronix Serial/Assembly No. Code Mfr. art No. Effective Dscont Name & Description Component No. art No. NTR25J-E100K RES ,FXD, FILM:100K 0HM,5X,0.25M 57668 A1R623 315-0104-00 19701 5043CX15K00J 315-0153-00 RES,FXD,FILM:15K 0HM,5X,0.25M A1R624 57668 NTR25J-E 100E A1R625 315-0101-00 RES ,FXD, FILM: 100 0HM,5X,0.25M...
  • Page 162 Replaceable Electrical arts - 7T11A Mfr. Tektronix Serial/Assembly No. Name & Description Code Mfr. art No. Component No. art No. Effective Dscont MD201C103KQ0 CA ,FXD, CER DI:0.01UF,10X,100V 04222 A 2C230 281-0773-00 M0101Q100K0Û CA ,FXD, CER DI:10 F,10ï,100V 04222 A 2C232...

  • Page 163: Figure 3-1

    Replaceable Electrical arts - 7T11A Mfr. Tektronix Serial/Assembly No. Code Mfr. art No. Component No. art No. Effective Dscont Name A Description 5 102M2011958 283-0121-00 CA ,FXD,CER D I : 1000 F, 201, 200V 91418 A2C823 15051C103KZT6C A2C824 283-0253-00 CA ,FXD, CER 01:0. 01UF, 101, 100V 04222 CA ,FXD, CER 01 :0.01UF,10Z,100V...
  • Page 164 Replaceable Electrical arts - 7T11A Serial/Assembly No. Mfr. Tektronix Mfr. art No. Component No. art No. Effective Dscont Name & Description Code TRANSISTOR: N N, SI , TO- 92 80009 151-0190-00 A 2Q316 151-0190-00 151-0188-00 A 2Q318 151-0188-00 TRANSISTOR: N ,SI,TO-92...
  • Page 165 Replaceable Electrical arts - 7T11A Mfr. Tektronix Serial /Assembly No. Mfr. art No. Effective Dscont Name & Description Code Component No. art No. RES,FXD,CM SN:20 OHM ,5X,0.125M 01121 882005 A2R228 317-0200-00 RE5 ,FXD, FILM:56K OHM ,5X,0.25H 19701 5043CX56KOOJ A 2R232 315-0563-00 RES ,FXD, FILM:10K OHM ,5X,0.25M...
  • Page 166 Replaceable Electrical arts - 7T11A Tektronix Serial/Assembly No. Mfr. Name & Oescriotion Code Mfr. art No. Comoonent No. art No. Effective Dscont 19701 5043CX10K00J A2R361 315-0103-00 RES,FXD,FILM:10K OHM ,52,0.25« 57668 NTR25JE01K0 A2R363 315-0102-00 RES,FXD,FI LM: 1K OHM,51,0.25k RES , FXD.FILM: 20K OHM, 52, 0.25«...
  • Page 167 Replaceable Electrical arts - 77'11 A Tektronix Serial/Assembly No. Mfr. Mfr. art No. Effective Dscont Name & Descriotion Code Component No. art No. RES ,FXD, FILM:10.0K OHM ,0.25X,0.125H,TC=T2 07716 CE0C10001C A 2 R 527 321-0289-03 RES ,FXD, FILM:100K OHM, 52, 0.25W...
  • Page 168 Replaceable Electrical arts - 7T11A Mfr. Serial/Assembly No. Tektronix Code Mfr. art No. Component No. Effective Dscont Name & Description art No. SR155A220JAA 283-0154-00 CA ,FXD, CER 0I:22 F,5X,50V 04222 A3C29 15051C103KZT6C CA ,FXD, CER 01:0. 01UF.10X,100V 04222 A 3C33...
  • Page 169 Replaceable Electrical arts - 7T11A Tektronix Serial/Assembly No. Mfr. Component No. art No. Effective Dscont Name & Description Code Mfr. art No. SEMICOND DVC , DI :S W , S I,30V , 150MA ,30V 03508 0A2527 (1N4152) A3CR51 152-0141-02 A 3CR63...
  • Page 170 Replaceable Electrical arts - 7T11A Mfr. Tektronix Serial/Assembly No. Code Mfr. art No. Component No. art No. Effective Dscont Name & Description TRANSISTOR:N N,SI,X-55,SEL 57668 XD11BC 0207 A3Q136 151-0207-00 80009 151-0188-00 A3Q138 151-0188-00 TRANSISTOR; N ,SI,T0-92 TRANSISTOR:N N,SI JO-77 A2607...
  • Page 171 Replaceable Electrical arts - 7T11A Mfr. Tektronix Serial/Assembly No. Name & Description Code Mfr. art No. Component No. art No. Effective Dscont 3329 -L58-104 RES,VAR,NON WW: TRMR,100K OHM, 0.5« 32997 A3R80 311-1272-00 01121 885115 RES ,FXD, CM SN:510 OHM,5X, 0.125»...
  • Page 172 Replaceable Electrical arts - 7T11A Mfr. Tektronix Serial/Assembly No. Mfr. art No. Effective Oscont Name & Descrißtion Code Comoonent No. art No. NTR25J-E270E RES,FXD,FILM. ’ 270 OHM ,5X,0.25N 57668 A3R157 315-0271-00 NTR25J-E150E RES,FXD,FILM:150 OHM ,5X,0.25N 57668 A3R158 315-0151-00 57668 NTR25J-E 2K...
  • Page 173 Replaceable Electrical arts - 7T11A Serial/Assembly No. Mfr. Tektronix Code Mfr. art No. Comoonent No. art No. Effective Dscont Name & Description 120-0382-00 C0IL,RF:210UH,+28X-43X,14 TURNS 80009 120-0382-00 A4L803 JHM407O59 C0IL,RF:FIXED,2.7UH 76493 A41804 108-0538-00 RES ,FXD, CM SN:51 OHM ,5X,0.125H 01121...
  • Page 174 Replaceable Electrical arts - 7T11A Tektronix Serial/Assembly No. Mfr. Component No. Effective Dscont Name & Description Code Mfr. art No. art No. CIRCUIT B D ASSY:RANDOM SEQUENCE SN 80009 670-1199-01 670-1199-01 A9 D S20 150-0048-01 LAM ,INCAND:5V,0.06A, # 683,AGED & SEL...

  • Page 175: Section 8 - Diagrams And Circuit Board Illustrations

    The overline on a signal name indicates that the signal performs its intended function when it goes to the low state. Abbreviations are based on ANSI Y1. 1-1972. Other ANSI standards that are used in the preparation of diagrams by Tektronix, Inc. are: Y14.15, 1966 Drafting Practices.
  • Page 176 NOTE LEAD CONFIGURATIONS AND CASE STYLES ARE TYPICAL, BUT MAY VARY DUE TO VENDOR CHANGES OR INSTRUMENT MODIFICATIONS. LIGHT EMITTING I ___________ METAL CASE ____________ | SIGNAL DIODE DIODE (L.E.D.) TRANSISTORS LASTIC CASE DUAL METAL LASTIC CASE FETS CASE FET TRANSISTORS INTEGRATED CIRCUITS 6176-118...
  • Page 177 Figure 8-2. Location of circuit boards in the 7T11A.

  • Page 178: Diagram

    Voltage and time readouts are simulated in larger-than-normal type. Waveforms with the notation “ Ext Trig ” were taken with the Time Base externally triggered from the 7T1 1 A PULSE OUT connector. Notations below the waveforms, other than “ Ext Trig ” , refer to 7T11A control settings.
  • Page 179 HF Sync Selected HF Sync Selected...
  • Page 180 THIA SAMPLING SWEEP UNIT 6176-127...
  • Page 181 TRIGGER INPUT <J> 6(76-127...
  • Page 182 7T11A Figure 8-3. A3-Trigger circuit...
  • Page 184 GRID CIRCUIT GRID CIRCUIT GRID CIRCUIT GRID CIRCUIT GRID CIRCUIT NUMBER COORD. COORD. NUMBER COORD. NUMBER COORD. NUMBER NUMBER COORD. I MA R156 CR73 R157 CR91 R158 CR92 R159 CR95 R161 CR96 R163 Q102 CR103 R164 Q104 CR105 R165 CR106 Q122 R167 Q128...
  • Page 185 Ext Trig...
  • Page 188 7T11A Figure B-4. A2-Timing circuit boar COM ONENT NUMBER EXAM LE Component Number A2 R1234 SCWafc ’ — - CVra/rf Number Süùassmiô/J' A ’ j j'^ber Number t>! used) i:tias5"5-rnuuril;t5.1 i;<jnipçrtenis na .-e Assembly NnjiTC#r prefix — sew fine 1 ol...
  • Page 190 CIRCUIT GRID CIRCUIT GRID CIRCUIT GRID CIRCUIT GRID GRID CIRCUIT GRID CIRCUIT NUMBER COORD. COORD. NUMBER COORD. COORD. NUMBER COORD. NUMBER COORD. NUMBER NUMBER R253 R558 Q328 R415 0212 C824 R559 Q329 R260 R422 C826 0213 R561 Q342 R261 R423 0215 C827 R562...
  • Page 191 Time position CW SEQUENTIAL Ext Trig Time position CW RANDOM...
  • Page 193 <9> £176-12*5 TIME TO HEIGHT CONVERTER <s>...
  • Page 194 7T11A...
  • Page 196 GRID CIRCUIT GRID CIRCUIT GRID CIRCUIT CIRCUIT GRID NUMBER COORD. NUMBER COORD. COORD. NUMBER COORD. NUMBER R691 -15 V CR667 R583 R693 R584 -50 V CR671 R694 + 15V R585 CR672 R714 CR682 R586 R807 +50 V R587 CR807 R588 T650 R591 R592...
  • Page 197 1000 Ω resistor between pins 17 & 18 of J641...
  • Page 198 NOTfcS*. UEADLE55 CAPACITOR l.*FOR. DECOUPLING NETWORKS SEE<H> THIA SAMPLING SWEEP UNIT GITG.-I3Ö...
  • Page 200 7T11A Figure 8-6. A4-lnterface circuit...
  • Page 201 8-6. A4-lnterface circuit board assembly.
  • Page 202 CIRCUIT GRID CIRCUIT GRID COORD. NUMBER NUMBER COORD. R649 C100A R678 C100B C290A R681 R685 C290C C290D R741 R742 C290E R744 C318A R745 C318B R747 C318C C802 R748 R751 C803 R752 C804 R754 C822 R755 C825 R756 R759 L802 L803 R761 R762 L804...
  • Page 206 5 ns/DIV 5 ns/DIV 5 ns/DIV 5 ns/DIV Ext Trig 5 ns/DIV...
  • Page 209 Ext Trig...
  • Page 215 W7G- 135 •7TII SAMPLING SWEEP UNIT...
  • Page 216 W7G- »35 TIMING SWITCHES <^>...
  • Page 217 TO EMITTER Q38 THRU R35 TO EMITTER Q3fe THRU R3fe FROM COLLECTOR Q344 FROM COLLECTOR Q342 <4> <M76-l¾ 1T11A SAMPLING SWEEP UNIT...
  • Page 218 ,-136 OUTPUT CONNECTORS <0>...
  • Page 219 ARTIAL A4 INTERFACE &OARD~| Gl7<i-I37 7T11A. SAMPLING SWEEP UNIT...
  • Page 220 .-137 VOLTAGE DISTRIBUTION £ DECOUPLING <H>...
  • Page 221 £174-136 1T11R SAM LING SWEE UNIT...
  • Page 222 FRONT PANEL SWITCHING...
  • Page 223 T 884 T 658 Figure 8-7. Location of Logic adjustments.
  • Page 224 Memory Gate Rate Servo SO ns Zero Slewing Ramp Slewing Feet Timing + 10V Adj T 602 R550 R440 R6OO R310 C313 R260 Figure 8-8. Location of Timing adjustments. Junction ot Junction of Output Bias R94-R93 RS3-R56 R155 □ » W* 6176-126 Junction of X10 Zero...
  • Page 225 Following is an example of the indentation system Tektronix. Inc Field Office or representative. used in the description column. Changes to Tektronix instruments are sometimes made to 1 2 3 4 5 Name & Descrip ion accommodate improved components as they become available,...
  • Page 226 Replaceable Mechanical arts - 7T11A CROSS INDEX - MFR. CODE NUMBER TO MANUFACTURER Mfr. City. State. ZiD Code lode Manufacturer Address HARRISBURG A 17105 00779 0 BOX 3608 1201 SOUTH 2ND ST MILWAUKEE MI 53204 01121 ALLEN-8RA0LEY CO RICHAROS AVE...
  • Page 227 Replaceable Mechanical arts - 7T11A Fig. & Index Tektronix Serial/Assembly No. Mfr. No ■ art No , ______ Effective Dscont 12345 Name & Description __________________ Code Mfr. art No. 80009 366-1064-00 366-1064-00 KNOB:GY, 0.096 ID X 0.392 00 X 0.466 .SETSCREW: 5-40 X 0.125,STL...
  • Page 228 Replaceable Mechanical arts - 7T11A Fig. & Index Tektronix Serial/Assembly No. Mfr. No , art No . _______ Effective Dscont 12345 Name ¾ Description __________________ Code Mfr, art No, 92101 OROER BY DESCR 348-0235-00 SHLD GSKT,ELEK:FINGER TY E, 4.734 L...

  • Page 229: Index

    Replaceable Mechanical arts - 7T11A Fig. Ä Index Tektronix Serial/Assembly No. Mfr. No . art No . ______ Effective Dscont 12345 Name & Description __________________ Code Mfr. art No. 1-83 166-0222-00 •SLEEVE,CA .:0. 187 10 X 0.225 00 X 0.325 L,...
  • Page 230 Replaceable Mechanical arts - 7T11A Fig. 4 Mfr. Serial/Assembly No. Index Tektronix Code Mfr. art No. Effective Dscont 12345 Name 4 Description art No. .RES,V0R,N0NMM: NL,2X20K OHM, 0.5« 1-129 . (SEE A4R530 RE L) . (OTTOCHING ORTS) 2X-20319-402 . NUT, LAIN,HEX:O. 25-32 X 0.312,BRS CD...
  • Page 232 7T11A...
  • Page 233 Replaceable Mechanical arts - 7T11A Fig. & Index Tektronix Serial/Assembly No. Mfr. Code Mfr. art No art No. Effective Dscont 12345 Name & Description ATTENUATOR,FXD:10:1 OTTEN, 50 OHM,BNC 18203 0314-ES 011-0059-02 80009 012-0057-01 012-0057-01 COBLE 0SSY,RF:50 OHM COOX, 43.0 L...
  • Page 234 7T11A...

Table of Contents