7B80 Instruction TABLE OF CONTENTS PAGE PAGE LIST OF ILLUSTRATIONS . . . . . . . . . . . . . . . . . . . iii Trigger Slope . . . . . . . . . . . . . . . . . . . . 1-7 LIST OF TABLES . . . . . . . . . . . . . . . . . . . . . . . . . . iv Trigger Level . . . . . . . . . . . . . . . . . . . . 1-7 SAFETY SUMMARY. . . . . . . . . . . . . . . . . . . . . . . . . v Horizontal Sweep Rates . . . . . . . . . . . . . 1-7 Time Measurement . . . . . . . . . . . . . . . .
71380 Instruction TABLE OF CONTENTS (CONT.) PAGE PAGE SECTION 3 THEORY OF OPERATION SOLDERING TECHNIQUES . . . . . . . . . . . . 4-9 BLOCK DIAGRAM DESCRIPTION . . . . . . . . . . . 3-1 DETAILED CIRCUIT DESCRIPTION . . . . . . . . . 3-1 LOGIC FUNDAMENTALS . . . . . . . . . . . . . 3-1 NON-DIGITAL DEVICES. . . . . . . . . . . . . . 3-2 FRONT-PANEL DISTRIBUTION O1 . . . . . 3-7 TRIGGER GENERATOR O. . . . . . . . . . 3-7 LOGIC 03 . . . . . . . . . . . . . . . . . . . . . . . 3-9 SWEEP GENERATOR 4O .
71380 Instruction LIST OF ILLUSTRATIONS FIGURE NO . 1-1 1-2 1-3 1-4 1-5 1-6 1-7 1-8 2-1 3-1 3-2 3-3 3-4 3-5 3-6 4-1 4-2 4-3 4-4 PAGE Frontispiece . . . . . . . . . . . . . . . . . . . Location of release latch . . . . . . . . . . . Front-panel controls, connectors, and indicators . . . . . . . . . . . . . . . . . . Effect of LEVEL control and SLOPE switch on crt display . . . . . . . . . . . . . Area of graticule used for most accurate time measurements . . . . . . . . . . . . . .
1380 Instruction LIST OF TABLES TABLE NO . PAGE TABLE NO . PAGE 2-1 Electrical Characteristics . . . . . . . . . . . . . 2-1 3-2 Readout Character Selection . . . . . . . . . .3.15 2-2 Environmental Characteristics . . . . . . . . . 2-3 5-1 Test Equipment . . . . . . . . . . . . . . . . . . 5-2 2-3 Physical Characteristics . . . . . . . . . . . . . . 2-3 5-2 Sweep Timing . . . . . . . . . . . . . . . . . . . . 5-10 3-1 Basic Logic Reference . . . . . . . . . . . . . .
71380 Instruction SAFETY SUMMARY This manual contains safety information which the user must follow to ensure safe operation of this instrument . WARNING information is intended to protect the operator ; CAUTION information is intended to protect the instrument . The following are general safety precautions that must be observed during all phases of operation and maintenance . WARNING Ground the Instrument To reduce electrical-shock hazard, the mainframe (oscilloscope) chassis must be properly grounded.
71380 Features The 7880 Time-Base unit provides calibrated sweep rates from 5 seconds to 10 nanoseconds and triggering to 400 megahertz for 7700-, 7800-, and 7900-series oscilloscopes . A X10 Magnifier increases each sweep rate by a factor of 10 and a VARIABLE TIME/DIV control provides continuously variable sweep rates between calibrated steps . Variable hold off and alphanumeric readout are provided .
Section 1-71380 OPERATING INSTRUCTIONS The 71380 Time-Base unit operates with a Tektronix 7700-, 7800-, and 7900-series oscilloscope mainframes and a 7A-series amplifier unit to form a complete oscilloscope system . This section describes the operation of the front-panel controls and connectors, provides general operating information, a functional check procedure, and basic applications for this instrument .
Fig. 1-2. Front-panel controls, connectors, and indicators.
Operating Instructions-7B80 TRIGGERING LEVEL Control-Selects a point on the trigger signal where triggering occurs . SLOPE Switch-Permits sweep to be triggered on negative or positive-going portions of the trigger signal . READY Indicator-Illuminates when sweep circuit is armed (SINGLE SWEEP Mode) . TRIG'D Indicator-Illuminates when the display is triggered . MODE Pushbuttons-Selects the operating mode of the triggering circuit .
Operating Instructions-71380 5. Set the mainframe vertical and horizontal modes to display the plug-in units used and adjust the intensity and focus for a well-defined display . See the oscilloscope mainframe and amplifier unit instruction manuals for detailed operating instructions . Sweep Functions NORMAL SWEEP. Perform the following procedure to obtain a normal sweep and to demonstrate the function of the related controls : 1 . Perform the preceding Setup Procedure. 2. Connect a 0.
Operating Instructions-71380 8 . Press the AC COUPLING, INT SOURCE, and NORM MODE buttons . Adjust the LEVEL control for a stable display . 9 . Press the AUTO MODE button and adjust the LEVEL control for a free-running display . 10 . Press the NORM MODE button and check for no display . 11 . Adjust the LEVEL control for a stable display and press the SINGLE SWP MODE button . 12 . Note that one trace occurs when the RESET MODE button is pressed . 13 .
Operating Instructions-71380 The normal trigger mode must be used to produce triggered displays with trigger repetition rates below about 30 hertz. When the TRIG'D light is off, no trace is displayed. SINGLE SWEEP. When the signal to be displayed is not repetitive or varies in amplitude, waveshape, or repetition rate, a conventional repetitive type display may produce an unstable presentation . Under these circumstances, a stable display can often be obtained by using the single-sweep feature of this unit .
Operating Instructions-71380 EXTERNAL . The EXT position connects the signal from the EXT TRIG IN connector to the trigger circuit. The external signal must be time-related to the displayed waveform for a stable display. An external trigger signal can be used to provide a triggered display when the internal signal is either too low in amplitude for correct triggering or contains signal components on which triggering is not desired.
Fig . 1-3 . Effect of LEVEL control and SLOPE switch on crt display .
Mainframe Operating Modes The time-base unit can be operated either as an independent time base in any Tektronix 7700-, 7800-, or 7900series oscilloscope mainframe, or as a delayed-sweep unit in those mainframes that have two horizontal compartments . A companion delaying time-base unit is required for delayedsweep operation. Refer to the delaying time-base unit instruction manual for additional information . Fig. 1-4. Area of graticule used for most accurate time measurements. Fig. 1-5.
Operating Instructions-71380 APPLICATIONS The following information describes procedures and techniques for making basic time measurements with the time-base unit installed in a Tektronix 7700-, 7800-, or 7900-series oscilloscope . These procedures provide enough detail to enable the operator to adapt them to other related time measurements . Contact your Tektronix Field Office or representative for assistance in making measurements that are not described in this manual .
Operating Instructions-71380 9 . Determine the frequency of the displayed waveform obtained in steps 1 through 8 by taking the reciprocal of the period of 1 cycle . RISE TIME Example : Assume that the period of the displayed waveform is 0 .7 millisecond . AMIMEM NEENN mm~ W" o ~1 Using the formula : Frequency = 1 Period I~ICPIP Substituting values : Frequency = 1 0 .7 ms 1I = MEASURE HORIZONTAL DISTANCE FROM A TO B (10% TO 90%) 1 .
Operating Instructions-71380 8. Multiply the horizontal distance measured in step 7 by the TIME/DIV switch setting. (Divide the answer by 10 if sweep magnification is used .) 8. Multiply the horizonal distance measured in step 7 by the TIME/DIV switch setting. (Divide the answer by 10 if sweep magnification is used .) Example: Assume that the horizontal distance from the 10 to 90% points is 2.5 divisions and the TIME/DIV switch setting is .1 p.s (see Figure 1-7) .
Section 2-71380 SPECIFICATION This instrument will meet the electrical characteristics listed in Table 2-1, following complete adjustment. The following electrical characteristics apply over an ambient temperature range of 0° to +50° C, except as otherwise indicated . Warmup time for given accuracy is 20 minutes. TABLE 2-1 Electrical Characteristics Performance Requirement Characteristic SWEEP GENERATOR Sweep Rates Calibrated Range 5 s/div to 10 ns/div in 27 steps.
Specification-71380 TABLE 2-1 (CONT.) Electrical Characteristics Performance Requirement Characteristic Trigger Holdoff Time Minimum Holdoff Setting 5 s/Div to 1 ps/Div 2 times TIME/DIV setting or less . 0.5 ps/Div to 10 ns/Div 2.0 ps or less . Extends holdoff time through at least 2 sweep lengths for sweep rates of 20 ms/div or faster .
Specification-7880 TABLE 2-2 Environmental Characteristics Refer to the Specification section of the associated mainframe manual . TABLE 2-3 Physical Characteristics Net Weight Approximately 2 .1 pounds (1 kilogram). Dimensions See Figure 2-1, dimensional drawing . OVERALL DIMENSIONS (MEASURED AT MAXIMUM POINTS) aoo ooa nao Do- 0 5.0 (12.7) O 00 (3.0) 1 12 .5 (31 .7) 1 .2 NOTE : .8 (2 .2) 14.5 (36 .9) TOP FIGURES IN INCHES LOWER FIGURES IN CENTIMETERS Fig . 2-1 . 7B80 dimensional drawing.
Section 3-71380 THEORY OF OPERATION This section of the manual describes the circuitry used in the 7880 Time-Base unit . The description begins with a discussion of the instrument, using the block diagram shown in Figure 3-1 . Next, each circuit is described in detail with a block diagram provided to show the major interconnections between circuits, and the relationship of the front-panel controls to each circuit.
Theory of Operation-7B80 Input/Output Tables Input/Output (truth) tables are used to show the input combinations important to a particular function, along with the resultant output conditions . This table may be given either for an individual device or for a complete logic stage. For examples of input/output tables for individual devices, see Table 3-1 . NON-DIGITAL DEVICES Not all of the integrated circuits in this instrument are digital logic devices.
Theory of Operation-71380 TABLE 3-1 Basic Logic Reference Description Symbol Device AND gate A B D X A device with two or more inputs and one output . The output of the AND gate is HI if and only if all of the inputs are at the H I state. Input/Output Table Input A A X B OR gate A X e A device with two or more inputs and one output . The output of the NAND gate is LO if and only if all of the inputs are at the H I state. A device with two or more inputs and one output .
Theory of Operation-71380 TABLE 3- 1 (cont) Device Symbol Description Input/Output Table A small circle at the input or output of a symbol indicates that the LO state is the significant state. Absence of the circle indicates that the HI state is the significant state. Two examples follow : LO-state indicator AND gate with LO-state indicator at the A input. The output of this gate is HI if and only if the A input is LO and the B input is HI .
Theory of Operation-71380 TABLE 3-1 (cont) Device Triggered Set-Clear (J-K) Flip-Flop D (data) Type Flip-Flop with Direct Inputs (Direct Inputs may be applied to all triggered flip-flops) Symbol Description A bistable device with three or more inputs and twu outputs (either or both outputs may be used). When gated, the outputs change state in response to the states at the inputs prior to the trigger. The outputs are complementary (i .e ., when one output is HI the other is LO).
Fig. 3-2. Detailed block diagram of Trigger Generator.
Theory of Operation-71380 FRONT-PANEL DISTRIBUTION The Front-Panel Distribution diagram shows the interconnections between front-panel functions (controls, connectors, and indicators) and circuit boards within this instrument . TRIGGER GENERATOR The Trigger Generator provides a stable display by starting the Sweep Generator (diagram 4) at a selected point on the input waveform . The triggering point can be varied by the LEVEL control and may be on either the positive or negative slope of the waveform .
Theory of Operation-7880 EXTERNAL INPUT LINE INPUT TRIGGER SOURCE SELECTOR PARTIAL U65 17 16 INTERNAL INPUT +TRIGGER TRIGGER 1986-62 Fig. 3-3. Functional diagram of Trigger Source Selector. PEAK-TO-PEAK LEVEL RANGE. The Peak-to-Peak Level Range stage amplifies the peak Detector signals to provide constant amplitude trigger signals and to determine the range of the front-panel LEVEL control. Peak Detector signal amplitude is dependent on triggering (input) signal amplitude.
Theory of Operation-71380 Gate Generator The Gate Generator stage provides an auto enable gate to the Logic circuits (diagram 3), and a sweep start gate and Z-axis gate (unblanking) to the Sweep Generator circuit (diagram 4) . Refer to Figure 3-4 for a timing diagram of the Gate Generator functions. When an adequate trigger signal is applied to U85-pins 13 and 14, a HI level is produced at U85-pin 3 and a LO level is produced at U85-pin 4.
Theory of Operation-71380 NORMAL MODE . The NORM MODE is provided when U220-pin 12 is LO . In the NORM MODE, only an appropriate trigger signal can initiate a sweep gate to the Sweep Generator (diagram 4) . Sweep Control integrated circuit U220 controls sweep lockout and hold off functions. AUTO MODE . The Auto Control stage produces a freerunning reference trace (bright base line) in the absence of a trigger signal .
Theory of Operation-71380 Q204 prevent the sweep disable out pulse at U220-pin 17 from falling LO until the timing capacitors have discharged . Transistors Q212 and Q214 and front-panel HOLD OFF control R210 provide variable current to the timing components to change the hold off time period . Lockout Buffer Amplifier A lockout pulse (HI) may be initiated at interface connector pin B8 by mainframe switching functions.
Fig. 3-6. Detailed block diagram of Sweep Generator .
Fig. 3-6. Detailed block diagram of Sweep Generator (cont.) .
Theory of Operation-71380 The Position Voltage Source stage combines the do voltages of the FINE and POSITION controls for a position voltage level at the output of operational amplifier U416 . This voltage level on the base of Q434 provides a ramp waveform offset voltage to horizontally position the displayed trace. TIME/DIVISION READOUT O5 The Readout circuits provide information to the mainframe readout system .
Theory of Operation-71380 TABLE 3-2 Readout Character Selection Characters Time-Slot Encoded By Description Decimal TS-1 Determines decimal magnitude (number of zeros displayed or prefix change information) . R751,13752 13756 Uncalibrated (>) TS-3 Indicates calibrated or uncalibrated sweep rates and delay times. 13761, 13764 1, 2, 5 TS-4 Scaling (TIME/DIV) . 13771 13772, 13773 m, p, n TS-8 Defines the prefix which modifies the units of measurement.
Section 4-71380 MAINTENANCE This section of the manual contains information for performing preventive maintenance, troubleshooting, and corrective maintenance for this instrument . PREVENTIVE MAINTENANCE Preventive maintenance consists of cleaning, visual inspection, lubrication, etc. Preventive maintenance performed on a regular basis may prevent instrument breakdown and will improve the reliability of the instrument .
Maintenance-71380 Cam Switch Lubrication In most cases, factory lubrication should be adequate for the life of the instrument . However, if the switch has been disassembled for replacement of switch sub-parts, a lubrication kit containing the necessary lubricating materials and instructions is available through any Tektronix Field Office . Order Tektronix Part 003-0342-01 . General Electric Versilube © silicone grease should be applied sparingly so that the lubricant does not get on the contacts .
Maintenance-71380 TROUBLESHOOTING The following information is provided to help troubleshoot this instrument . Information contained in other sections of this manual should be used along with the following information to aid in locating the defective component. An understanding of the circuit operation is very helpful in locating troubles, particularly where integrated circuits are used .
Fig. 4-2. Semiconductor lead configuration.
Fig. 4-4. End-lead multi-pin connector assembly . Fig. 4-3. Inter-board multi-pin connector assembly . Performance Check and Adjustment The Performance Check and Adjustment procedure, given in section 5 of this manual, provides a quick and convenient means of checking instrument operation . In some cases, minor troubles may be revealed or corrected by adjustment .
Maintenance-71380 Transistor Tester (Cont.) Recommended Tektronix types: 576 Curve Tracer, 577/177 Curve Tracer system, 7CT1 N Curve Tracer unit and a 7000-series oscilloscope system, or a 5CT1 N Curve Tracer unit and a 5000-series oscilloscope. Multimeter Description : Voltmeter, 10 megohm input impedance and a range from 0 to at least 50 volts dc ; accuracy, within 0.1%. Ohmmeter, 0 to 20 megohms. Test probes should be insulated to prevent accidental shorting . Purpose : Check voltage and resistance .
Maintenance-71380 NOTE Voltages and waveforms given on the diagrams are not absolute and may vary slightly between instruments. To obtain operating conditions similar to those used to take these readings, see the voltage and waveforms page adjacent to each schematic diagram. Note the recommended test equipment, front-panel control settings, voltage and waveform conditions, and test equipment cable connection instructions. 7 . CHECK INDIVIDUAL COMPONENTS .
Fig . 4-6 . 71380 troubleshooting chart .
Maintenance-71380 CORRECTIVE MAINTENANCE Corrective maintenance consists of component replacement and instrument repair. Special techniques required to replace components in this instrument are given here . OBTAINING REPLACEMENT PARTS All electrical and mechanical part replacements can be obtained through your Tektronix Field Office or representative . However, many of the standard electronic components can be obtained locally in less time than is required to order them from Tektronix, Inc.
Maintenance-71380 2. When the solder begins to melt, gently pull the lead out. If unable to pull out the lead without using force, try removing the other end of the component as it may be more easily removed . NOTE The reason some component leads are troublesome to remove is due to a bend placed on each lead during the manufacturing process. The bent leads hold components in place during a process that solders many components atone time.
REMOVE READOUT BOARD AS FOLLOWS: 1 . Note index of multi-pin connector attached to board and disconnect cable. 2. Loosen set screw on variable switch assembly . 3. Remove VARIABLE (CAL IN) TIME/DIV knob and attached shaft out the front of the instrument . 4. Remove the 8 securing screws from board. 5. Lift board away from cam switch assembly . TO REPLACE READOUT BOARD, REVERSE THE ORDER OF REMOVAL. Fig. 4-7. Readout board removal procedure. 4 .
Maintenance-71380 3. Install gray plastic rear panel with 4 securing screws . 4. Replace TIME/DIV knob on shaft. Align knob index with 2 ms position ; then, tighten 2 set screws on knob . 5. Replace VARIABLE knob and tighten set screw . 6. Replace all cables as noted during removal procedure. 7. Replace Trigger circuit board. Switches Two types of switches are used in this instrument . Contact alignment and spacing are critical to the operation of the push-button and cam switches .
Maintenance-71380 Handle silicone grease with care. Avoid getting silicone grease in eyes. Wash hands thoroughly after use. END-LEAD PIN CONNECTORS . The pin connectors used to connect the wires to the interconnecting pins are clamped to the ends of the associated leads. To remove and replace damaged end-lead pin connectors, remove the old pin connector from the end of the lead and clamp the replacement connector to the lead . Replacement devices should be of the original type or a direct replacement .
Fig. 4-9. Cam switch removal procedure .
Fig. 4-10 . Removal procedure for typical push-button switch .
Maintenance-71380 4-11) in the hole, if possible . If the ferrule remains in the circuit board, remove the spare ferrule from the replacement pin and press the new pin into the hole in the circuit board . If the ferrule is removed with the damaged pin, clean out the hole using a solder-removing wick and a scribe . Then, press the replacement pin with attached spare ferrule into the hole . Position the replacement pin in the same manner as the damaged pin .
Section 5-71380 PERFORMANCE CHECK AND ADJUSTMENT This section contains information necessary to perform a complete instrument performance check and adjustment . Limits given in the procedure are adjustment guides and should not be interpreted as performance requirements unless preceded by a check mark (-,/). Where possible, instrument performance is checked before an adjustment is made .
Performance Check and Adjustment-71380 TABLE 5-1 Test Equipment Examples of Applicable Test Equipment Description Minimum Specifications Purpose 1 . Oscilloscope Mainframe Tektronix 7000-series . Bandwidth, 400 MHz with 2 horizontal plug-in compartments . Provides a display for unit under test . a. Tektronix 7904 Oscilloscope System . 2. Amplifier Plug-In Unit Tektronix 7A-series. Bandwidth, 400 MHz; deflection factor, 10 mV to 0.5 V. Provides vertical input to oscilloscope mainframe. a.
Performance Check and Adjustment-71380 INDEX TO PERFORMANCE CHECK AND ADJUSTMENT PROCEDURE PAGE A. TRIGGERING SYSTEM 1 . Adjust DC Balance and Slope Balance (1385, R80) . 5-4 5-4 N/ 2. Check Triggering Modes 5-4 -v/ 3 . Check External Level Range 5-5 ~/ 5. Check Internal Triggering Sensitivity 5-6 N/ 4 . Check External Triggering Sensitivity 5-5 ~/ 6. Check Internal Trigger Jitter 5-7 ~/ 7. Check Line Triggering 5-7 B . HORIZONTAL SYSTEM 1 . Set Basic Sweep Calibration 5-8 5-8 2.
Performance Check and Adjustment-71380 A. TRIGGERING SYSTEM Equipment Required 1 . Oscilloscope mainframe . 6 . 50-ohm cables (2) . 2 . Amplifier plug-in unit . 7 . BNC T connector . 3 . Low-frequency sine-wave generator . 4 . High-frequency signal generator . 5 . Plug-in extender . BEFORE YOU BEGIN, see TEST POINT AND ADJUSTMENT LOCATIONS Control Settings in the Diagrams section . f . ADJUST-1385 (DC Balance) for a stable crt display .
Performance Check and Adjustment-71380 c. Set the amplifier unit deflection factor for 0.5 volts/ division . Set the low-frequency sine-wave generator for a 6-division display (3 volts) at 1 kilohertz . d. Set the TRIGGERING MODE to AUTO . N/ e. CHECK-Set the TRIGGERING LEVEL control for a stable display (TRIG'D light on). V f. CHECK-For a free-running display with TRIG'D light off when the TRIGGERING LEVEL control is set fully clockwise and fully counterclockwise . ~/ d.
Performance Check and Adjustment-71380 -./ h . CHECK-Set the SLOPE to (+) and repeat part g. i. Set the amplifier unit deflection factor for 50 millivolts/division and the low-frequency sine-wave generator for a 2 .5-division display (125 millivolts) at 200 hertz. Set the TIME/DIV switch to 5 ms . N/t. CHECK-Set the TRIGGERING MODE to P-P AUTO and check for a stable display (TRIG'D light on) when the LEVEL control setting is within the ends of the arrows on the front panel .
Performance Check and Adjustment-71380 h. Set the low-frequency sine-wave generator and the amplifier unit deflection factor for a 2-division display at 50 hertz. ~/ i . CHECK-For a stable display (TRIG'D light on) at all settings of the LEVEL control with COUPLING set to : 1 . AC 2. DC V j . Set the SLOPE to (+) and repeat part i . k. Set the low-frequency sine-wave generator and the amplifier unit deflection factor for a 0.5-division display at 200 hertz. Set the TIME/DIV switch to 5 ms . ~/ I .
Performance Check and Adjustment-71380 B. HORIZONTAL SYSTEM Equipment Required 1 . Oscilloscope mainframe. 5. 50-ohm cables (2) . 2. Amplifier plug-in unit . 6. 50-ohm termination . 3. Time-mark generator. 4. Plug-in extender . BEFORE YOU BEGIN, see TEST POINT AND ADJUSTMENT LOCATIONS Control Settings ~/ B2 .
Performance Check and Adjustment-71380 d. ADJUST-13430 (Mag Gain) for 1 marker/division over the center 8 divisions of display . e. Set the time-mark generator for 5-millisecond markers . Align the center time marker with graticule center . ~/ f. CHECK-Set the MAG switch to X1 and check that the center time marker is at graticule center within 0.5 division . g. ADJUST-13445 (Mag Reg) to align the center time marker with graticule center . h.
Performance Check and Adjustment-71380 TABLE 5-2 Sweep Timing b. Set the POSITION controls to midrange and TRIGGERING MODE to NORM . N/ c . CHECK-Using the TIME/DIV setting and time-mark generator settings from Table 5-2, check sweep accuracy for 1 time mark/division over the center 8 divisions within the tolerance given in Table 5-2. Set the POSITION controls and TRIGGERING LEVEL control as necessary for a stable display aligned with the vertical graticule lines.
Performance Check and Adjustment-71380 TABLE 5-3 Magnified Sweep Timing TIME/DIV Time Markers 10 ns 2 ns Tolerance (+15 ° to 35° C) 1 Within 0 .32 div Within 0 .32 div 20 ns 2 ns 50 ns 5 ns Within 0.32 div .1 ps 10 ns Within 0.2 div .2 ps 20 ns .5 As 50 ns 1 As .1 As 2 ps .2 ps 5 ps .5 ps 10 ps 1 ps 20 ps 2 ps 50 /is .1 ms 5 ps logs Within 0.2 div Within 0 .2 div Within 0.2 div Within 0 .2 div Within 0 .2 div Within 0.2 div Within 0.2 div Within 0.2 div .
Section 6-7880 REPLACEABLE ELECTRICAL PARTS PARTS ORDERING INFORMATION Replacement parts are available from or through your local Tektronix, Inc. Field Office or representative . Changes to Tektronix instruments are sometimes made to accommodate improved components as they become available, and to give you the benefit of the latest circuit improvements developed in our engineering department .
Replaceable Electrical Parts-7B80 CROSS INDEX-MFR. CODE NUMBER TO MANUFACTURER Mfr . Code 00853 01121 02735 04222 04713 07910 08806 11237 12697 12969 28480 32293 32997 50434 53184 56289 71590 72136 72982 73138 74970 75042 78488 80009 81483 90201 91637 6- 2 Manufacturer SANGAMO ELECTRIC CO ., S . CAROLINA DIV . ALLEN-BRADLEY COMPANY RCA CORPORATION, SOLID STATE DIVISION AVX CERAMICS, DIVISION OF AVX CORP . MOTOROLA, INC., SEMICONDUCTOR PROD . DIV . TELEDYNE SEMICONDUCTOR GENERAL ELECTRIC CO .
Replaceable Electrical Parts-7880 Ckt No . Tektronix Part No . Serial/Model No . Dscont Eff Name & Description CKT CKT CKT CKT CKT BOARD BOARD BOARD BOARD BOARD ASSY :INTERFACE ASSY :TRIGGER ASSY :TRIGGER ASSY :READOUT ASSY :X-Y SWITCHING(OPTION 2) All A2 A2 A3 AS ----- ----670-4181-00 670-4181-01 670-4182-00 670-4395-00 C3 C5 C7 C9 C12 290-0748-00 290-0748-00 290-0748-00 290-0534-00 281-0661-00 CAP.,FXD,ELCTLT :10UF,+50-10%,20V CAP.,FXD,ELCTLT :10UF,+50-10%,20V CAP.
Replaceable Electrical Parts-7880 Ckt No . Tektronix Part No . Serial/Model No . Eff Dscont Name & Description Mfr Code Mfr Part Number C312 C324 C330 C331 C332 283-0691-00 283-0111-00 281-0166-00 283-0633-00 295-0172-00 CAP .,FXD,MICA D :65OPF,1%,300V CAP .,FXD,CER DI :O .IUF,20%,50V CAP .,VAR,AIR DI :1 .9-15 .7PF,250V CAP .,FXD,MICA D:77PF,1%,100V CAP.,SET MTCHD :l0UF,0 .lUF,898Pff,0 .
Replaceable Electrical Parts-7880 Ckt No . Tektronix Part No . Serial/Model No .
Replaceable Electrical Parts-71380 Ckt No . Tektronix Part No . Serial/Model No .
Replaceable Electrical Parts-71380 Ckt No . Tektronix Part No . Serial/Model No . Dscont Eff Name & Description Mfr Code Mfr Part Number R54 R55 R56 R57 R58 315-0622-00 315-0202-00 315-0104-00 315-0104-00 321-0443-00 RES.,FXD,CMPSN :6 .2K OHM,58,0 .25W RES .,FXD,CMPSN :2K OHM,5%,0 .25W RES .,FXD,CMPSN :l00K OHM,5%,0 .25W RES .,FXD,CMPSN :IOOK OHM,5%,0 .25W RES .,FXD,FILM :402K OHM,1%,0 .
Replaceable Electrical Parts-7B80 Ckt No . Tektronix Part No . Serial/Model No . Eff Dscont Name & Description Mfr Code Mfr Part Number RES.,FXD,FILM :9 .76K OHM,1%,0 .125W RES .,FXD,FILM :10 .5K OHM,1%,0 .125W RES .,FXD,FILM :6 .98K OHM,18,0 .125W RES .,FXD,FILM :5 .9K OHM,18,0 .125W RES .,FXD,CMPSN :4 .7K OHM,5%,0 .25W 91637 91637 91637 91637 01121. MFF1816G97600F MFF1816G10501F MFF1816G69800F MFF1816G59000F CB4725 315-0622-00 315-0393-00 315-0121-00 315-0184-00 315-0432-00 RES .,FXD,CMPSN:6 .
Replaceable Electrical Parts-7880 Ckt No . Tektronix Part No . Serial/Model No . Eff Dscont Name & Description Mfr Code Mfr Part Number R352 8353 8354 8355 R356 315-0222-00 321-0222-07 321-0196-00 315-0162-00 321-0229-00 RES .,FXD,CMPSN:2 .2K OHM,5%,0 .25W RES .,FXD,FILM :2K OHM,0 .18,0.125W RES .,FXD,FILM :1 .07K OHM,1%,0 .125W RES .,FXD,CMPSN:1 .6K OHM,5%,0 .25W RES .,FXD,FILM :2 .37K OHM,18,0 .
Replaceable Electrical Parts-7B80 Ckt No . Tektronix Part No . Serial/Model No . Eff Dscont Name & Description Mfr Co de Mfr Part Number 8713 8714 8715 8717 8721 315-0273-00 321-0363-00 311-1232-00 321-0360-00 315-0121-00 RES .,FXD,CMPSN :27K OHM,5%,0 .25W RES .,FXD,FILM :59K OHM,18,0 .125W RES.,VAR,NONWIR :50K OHM,20%,0 .50W RES.,FXD,FILM :54 .9K OH4,1%,0 .125W RES.,FXD,CMPSN :120 OHM,5%,0 .
Replaceable Electrical Parts-7880 Ckt No . Tektronix Part No . Serial/Model No .
Section 7-71380 INSTRUMENT OPTIONS Your instrument may be equipped with one or more instrument options. A brief description of each option is given in the following discussion . Conversion kits, for most options, are available and can be installed at a later time . For further information on instrument options, see your Tektronix Catalog or contact your Tektronix Field Office . OPTION 2 This option provides an X-Y display feature.
Instrument Options-71380 TABLE 7-1 Option Information Locator Information contained in this section. Electrical X bandwidth, X deflection factor accuracy, and phase shift information contained in this section. Description contained in this section. Operation is described with reference to Section 8 diagram numbers 7, 3, and 4 . Replaceable electrical parts are listed in Section 6 of this manual . Parts unique to the Option 2 Time Base are referenced to the footnote "Option 2 only".
Option 2-71380 OPTION 2 This option provides a means to obtain an X-Y display . The horizontal and vertical (X-Y) signals are applied to the inputs of a dual-trace amplifier unit, or two single amplifier units. The horizontal signal is then routed through the amplifier and mainframe trigger paths to the Option 2 instrument . The front-panel DISPLAY MODE switch selects either normal sweep displays or X-Y displays . A functional description of the X-Y display feature will follow .
Option 2-71380 Internal Sweep Operation When the DISPLAY MODE push button is pressed and latched to the IN : TIME BASE position, all functions and controls of the instrument operate as described (in Section 1-Operating Instructions) for the standard instrument . Operation in an X-Y mode is not possible until the DISPLAY MODE push button is pressed and released to the OUT : X-Y position . provided .
Option 2-71380 3. The attenuator switch of the vertical channel in the horizontal signal path provides many deflection-factor settings to allow full-range amplitude control . 3. Set each amplifier unit input coupling switch to dc, and set the position controls of the selected X and Y channels for a spot display at graticule center . OPERATION WITH DUAL-TRACE AMPLIFIERS . When dual-trace amplifier units are based with the Option 2 TimeBase unit, any vertical channel maybe used for X or Y signal inputs .
Option 2-71380 Figure 2) and the overall horizontal distance of the display (B) is eight divisions. Substituting values : Using the formula : Obtaining the angle from a trigonometric table: sin (Phase Angle) = center opening distance (A) sin (Phase Angle) = 2 .7 d ivisions 8 divisions = 0.3375 Phase Angle = sin-' 0 .3375 = 19 .7° overall distance (B) The phase angle difference between the X and Y signals is 19 .7 °. SPECIFICATION operating in the X-Y display mode .
Option 2-71380 THEORY OF OPERATION The following information provides a description of electrical operation of the Option 2 Time Base X-Y function and is intended to supplement the circuit operation description for the standard instrument as given in Section 3 of this manual . The Option 2 circuitry is described with reference to the schematic diagrams in the Diagrams section at the rear of this manual .
Option 2-71380 The HI level prevents mainframe switching commands from affecting the X-Y display. This same HI level is coupled through the Lockout Buffer Amplifier (Q201, Q202, and Q206 on diagram 3) to the lockout input at U220-pin 18, to cause a trigger disable level at U220 pin 17 thereby disabling the sweep. X-Y LOGIC. In the X-Y mode, Q962 is turned on and its collector becomes LO .
Section 8-71380 DIAGRAMS AND CIRCUIT BOARD ILLUSTRATIONS Symbols and Reference Designators : Electrical components shown on the diagrams are in the following units unless noted otherwise Capacitors = Values one or greater are in picofarads (pF) . Values less than one are in microfarads (MF) . Resistors = Ohms (SZ) . Symbols used on the diagrams are based on ANSI Standard Y32.2-1970. depict the logic Logic symbology is based on ANSI Y32.14-1973 in terms of positive logic.
Fig. 8-1 . Semiconductor lead configurations.
Fig. 8-2. Location of circuit boards in the 7B80 .
7B80 MB : :ast4x CR314 ".9_W R139 L ' -W Fig. 8-6 . A1-Interface circuit board assern REV . C MAY 1978 CKT NO GRID CKT COORD NO C204 C211 C212 C213 C214 C215 C221 C222 C225 C228 C312 C324 C330 C331 C332 C333 C334 C335 C336 C356 C381 C416 C432 C440 C515 C571 4K 31 51 51 5J 41 3.1 51 2J 2 .
L114 _. ._5314 j 1314 "k _R7z3 _ 321 _~., -Mz5 and assembly . T 74 75 31 33 D7 D8 12 13 14 15 21 22 23 24 25 26 30 31 32 33 34 35 36 37 38 CKT GRID COORD NO 5E 4A 2F 2F 2F 2F 3F 2G 2G 2G 2G 2H 2G 2H 2G 2H 3G 3G 3F 3E 3F 2G 3F 2F 4F R339 R341 R342 8343 8344 8345 R346 R347 R351 R352 R353 R354 R355 R356 R358 R362 R371 R372 R381 R382 R383 R412 R413 R414 R416 R422 GRID CKT COORD NO 2G 2C 2C 2C 1B 1C 2B 2B 1F 2F 2G 2G 1G 4K 3K 4.
A B C D E 6 CM r~a 1119 T L&MBACK _ u E --- c-1 r- B _ L- ~ R94n r R44 T F R61 (' ~-yG85 ELI =L~ r 5 CA53 R56 0 R 4 --~ R51 R53 F-1 C ®i 7- R52 4HIS 4 _ ,~ >r C69 R59 I[* R58 ,~ U55 t -L I ice' R65 6. 1 k C6 R916 R86 < R63 j .64 R" R 3 ' 85 4 J300 J200 R93 A -J -3 n T ; '~ ~- FL C92" R48 -' 048 R49 ©1 1 CR71 R74 r, C71 1L~iZ, .~ " Ci4 . E Q U65 U75 \ =F `.r ~ A' 0~2 B ¢ - , CR2J CR24 . u _ .
VOLTAGE AND WAVEFORM CONDITIONS The voltages and waveforms shown were obtained with the 7B80 controls set as follows : TIME/DIV, 1 ms ; VARIABLE (CAL IN), knob in ; MAG, X1 (button in) ; HOLD OFF, fully counterclockwise SWP CAL, midranged ; POSITION, midranged ; TRIGGERING : LEVEL, midranged ; MODE, P-P AUTO ; COUPLING, AC ; SOURCE, LINE ; SLOPE, +. Voltage Conditions .
7880 039 '(1314 CR314 -BXL 11 _533_' ,C335, 8335 ; CR324 _5314 JUD R32L' _8325 024 -'F13Y ; .1CA3L, ,., Fig . 8-8 . A1-Interface circuit board assembly . REV .
va2o R715 J100 . 1200 88327 ' . R355 R353 (13521 ;11356 R728 .' .I F 1 . 1 . 'K (1304 R321 1 ~Lu, 1 3142, C844-1,, i 1 1 " I! 04 1 1 ~23i 1 ~ R215 - R51 t ? 1 1 II :11 1. 1 1 1 0230'- C204 C215 __ _ -t . .R271 Q36Y ,~13 . 1}?03 8234. : 111 C3$6 16,3.56, yAu3.r _; -R202" _ezz7 . PCR362 '". EL I .0.234 -C rpyp' ..R D J 400 J 500 ace circuit board assembly .
VOLTAGE AND WAVEFORM CONDITIONS The voltages and waveforms shown were obtained with the 71380 controls set as follows : in) ; HOLD OFF, fully counterclockwise SWP CAL, midranged ; TIME/DIV, 1 ms ; VARIABLE (CAL IN), knob in ; MAG, X1 (button P-P AUTO ; COUPLING, AC ; SOURCE, LINE ; SLOPE, + . midranged ; MODE, : LEVEL, midranged ; TRIGGERING POSITION, using a digital multimeter with a 10 MS2 input impedance (Tektronix Voltage Conditions .
7B80 8715 8710 P3 R351 0352 8439 C840 LR840 R428 427 J5 C 20 LR820 R447 I R446 C810 C830 C44045 R333 R457 0314 83,k R32 R32 CR314 R313 CR334 R339 0335 0334 R33h CR324 R32 0324 CR3: R312 R448 8440 8459 R4',8 8454 L9830 0338 0304 CR302 R301 R426 C0312 R423 R30R33 54R35 R440 . 040424 28 R336 1 8444 MID CR301 34 C3 R31; R354 8303 R308 R337 R3 0356 04,18 V / R434 R456 R7W CR724 Fig. 8-9. A1-Interface circuit board assembl , REV.
R711 CR717 R717 C R 118 .6326 6324 8721 . 6729 C722 032?/ V, 1' . CR723 C 13U . 6731. 7311. C228 6212 U722 1°" - . 0214 Q210 6322 5 624 6226 CR22C H213 6215 C225 U844 CR224 6224 . R51 R228 C221 .732 \ J300 R244 R242 0242 0204 6241 CR202 8208 .
P21 5800 5725 1959-47 Fig . 8-10 . A3-Readout circuit board assembly .
VOLTAGE AND WAVEFORM CONDITIONS The voltages and waveforms shown were obtained with the 71380 controls set as follows: TIME/DIV, 1 ms ; VARIABLE (CAL IN), knob in ; MAG, X1 (button in); HOLD OFF, fully counterclockwise ; SWP CAL, midranged ; POSITION, midranged; TRIGGERING : LEVEL, midranged ; MODE, P-P AUTO ; COUPLING, AC ; SOURCE, LINE ; SLOPE, +. Voltage Conditions .
7B80 .;G314. naffs Gala CR314 ..R313_ .,BM_ . r-B= -UU' ,_83Z5~ , ' R335.! ' '. ,i CR324 :MAP Fig. 8-11 . A1-Interface circuit board assemb REV.
R7u , . .., - .eR1.14 . 0324 PB10 J 200 R728 R353 18114 ;024__ .B31L 8314 '-,B323. .. .R321. 8325 35 1 CR324 P820 - . R706 R7U R717 CR718 B32fl. '.R324 .' . R129,'C722 R322 YR728' CR723 C73D. . .8231 '022 iR32J Val X218_ X76 RZ4 . R217 CR717, 0214, 0210' _ 8212 8211 P213 `_ RZ1-' U722 0732 . 8841 (3_842 ., U842 C844 .:. C228 GRZ26 ; 8226- CR226 . _ R228` C225 CR224 8224 : R51 i ' H2u tR24ll_ 8242' 0242 : C221 C211 a -4844 n 0230 J 30D _ 8204 (1264 8241' C.
1959-49 Fig. 8-12. A3-Readout circuit board assembly .
7B80 Iwo R429 ER423 R427' H447 'U428 . Q448 R449 C440 0424 '. 8459 8440 Q45F R454 a Fig . 8-13 . A1-Interface circuit board assembly . REV .
..513,. ..,t3I1A . _R712 B715 .0342 ,11356 8354 . : 0304 ,X1338 . ,(1314 CR314 ; ,9113 833.9 J;335 . CR324 S ' 01 A35i.d R353 "Y K314 C3Z4 ' ,...9115 .6 8314 e g323 ; 8321 R325 0324 P820 Bt4 R706 J100 R728 - R7J1_ 8717 ' CR118 _ -J32z6 8324' C712 ;. VR728 CR723 '030% . AI31 0327 J 200 ' . . . .8211 -MB CR711 ,Aa.2L, R72B 0722 9216 Azu ',0214 CM, CR225 -R228 'CR226 , F122B 5212 . . ' U722 " _,..~.. .._ . fl 732 8214. R213 .. . ` _ 8215 .... . _ t, R842 8944, 0844 .
7B80 A B F JE a 0 0 El~] TIG 3 1986-54 Fig . 8-14 . A5-X-Y Switch circuit board assembly .
+ r 1l~~ W. o ~. oSer ,, 1Seee~ We lloff R430 MAG GAIN dyi ~sJilH C330 50 ns TIMING Fig. 8-15. Location of Sweep Timing adjustmoo R80 SLOPE BAL R85 DC BAL Fig. 8-16 . Location of Triggering adjustments .
. R715 10 ms TIMING C330 50 ns TIMING Sweep Timing adjustments.
Section 9-7880 REPLACEABLE MECHANICAL PARTS PARTS ORDERING INFORMATION Replacement parts are available from or through your local Tektronix, Inc . Field Office or representative . Changes to Tektronix instruments are sometimes made to accommodate improved components as they become available, and to give you the benefit of the latest circuit improvements developed in our engineering department.
Replaceable Mechanical Parts-71380 CROSS INDEX-MFR. CODE NUMBER TO MANUFACTURER Manufacturer Mfr. Code 07707 08261 13257 22526 24931 55210 56878 71159 71590 73743 73803 74445 78189 79136 80009 82647 83385 87308 9-2 USM CORP ., USM FASTENER DIV. SPECTRA-STRIP CORP . AMERACE, LTD . BERG ELECTRONICS, INC. SPECIALTY CONNECTOR CO ., INC . GETTIG ENG. AND MFG . COMPANY STANDARD PRESSED STEEL COMPANY BRISTOL SOCKET SCREW, DIV . OF AMERICAN CHAIN AND CABLE CO ., INC . CENTRALAB ELECTRONICS, DIV.
Replaceable Mechanical Parts-7B80 Fig . & Index No . Tektronix Part No . Serial/Model No .
Replaceable Mechanical Parts-7880 Fig. & Index No . Tektronix Part No . Serial/Model No . Eff Dscont Mfr Code Mfr Part Number 80009 80009 80009 22526 360-1650-00 366-1257-93 366-1559-00 65306-002 83385 OBD 80009 80009 80009 263-0016-00 263-0015-00 343-0495-04 07707 07707 SE-27 SE-25 80009 80009 343-0495-03 343-0499-04 07707 07707 SE-27 SE-25 CLIP,SWITCH :7 .5 MM,4 UNIT TERMINAL,PIN :0 .365 L X 0 .25 PH,BRZ,GOLD PL CONNECTOR BODY, :CKT CD MT,3 PRONG ACTR ASSY,PB :1 PUSH,7 .
Replaceable Mechanical Parts-71380 Fig . & Index No . Tektronix Part No . Serial/Model No . Eff Dscont Qty 1-83 ----- ----- 1 -84 -85 211-0207-00 211-0008-00 4 1 -86 -87 -88 -89 -90 _____ _____ 131-0604-00 136-0263-04 131-0589-00 352-0274-00 129-0570-00 9 3 10 1 1 -91 211-0008-00 1 -92 -93 -94 260-1771-00 361-0411-00 384-1417-00 1 2 1 -95 213-0299-00 -96 -97 -98 -99 -100 1 2 3 4 5 Name & Description . CKT BOARD ASSY :READOUT(SEE A3 EPL) (ATTACHING PARTS) . SCR,ASSEM WSHR :4-40 X 0 .
Replaceable Mechanical Parts-7880 Fig . & Index No . 1- Tektronix Part No . Serial/Model No .
Fig . & Index No . Tektronix Serial/Model No . Dscont Part No .
OPTION 2 X-Y Display c 4 Fig . & Index No . 3-1 -2 -3 -4 Tektronix Serial/Model No . Dscont Qty Part No . Eff -5 -6 426-1072-00 333-2151-00 366-1512-00 384-1058-00 384-1445-00 131-0592-00 129-0198-00 -7 -8 211-0008-00 211-0116-00 -9 -10 -11 -12 -13 ----- ----384-1425-00 384-1445-00 263-0011-00 263-0011-06 343-0495-01 -14 210-3050-00 2 -15 343-0499-01 2 -16 210-3050-00 -17 136-0252-04 REV .
MANUAL CHANGE INFORMATION At Tektronix, we continually strive to keep up with latest electronic developments by adding circuit and component improvements to our instruments as soon as they are developed and tested . Sometimes, due to printing and shipping requirements, we can't get these changes immediately into printed manuals . Hence, your manual may contain new change information on following pages . A single change may affect several sections .
CALIBRATION TEST EQUIPMENT REPLACEMENT Calibration Test Equipment Chart This chart compares TM 500 product performance to that of older Tektronix equipment. Only those characteristics where significant specification differences occur, are listed . In some cases the new instrument may not be a total functional replacement. Additional support instrumentation may be needed or a change in calibration procedure may be necessary.
T E KT R O NIX0 committed to technical excellence CHANGE : MANUAL CHANGE INFORMATION PRODUCT 7B50A,7B80 & 7B85 CHANGEREFERENCE DATE I C4/978 9-29-78 DESCRIPTION 7B50A (070-1986-00) 7B80 (070-1959-00) 7B85 (070-1961-00) TEXT CORRECTIONS ADD new Step A4 as follows : Page 5-5 (7B50A & 7B80) Page 5-6 (7B85) A4 . ADJUST TRIGGERING SENSITIVITY (R49) a . Set the TRIGGERING LEVEL control to 0 . Set the TRIGGERING MODE to NORM, SOURCE to INT . b .
MANUAL CHANGE INFORMATION TEKTRONIX© - committed PRODUCT to technical excellence CHANGE : 7B80 & 7B85 CHANGE REFERENCE DATE DESCRIPTION I EFF SN B054000 (7B80) 070-1959-00 EFF SN B084000 (7B85) 070-1961-00 ELECTRICAL PARTS LIST CHANGES CHANGE TO : Q98 151-0342-00 TRANSISTOR :SILICON,PNP,2N4249 Q201 151-0221-00 TRANSISTOR :SILICON,PNP,2N5771 Q352 151-0221-00 TRANSISTOR :SILICON,PNP,2N5771 Q356 151-0221-00 TRANSISTOR :SILICON,PNP,2N5771 Q362 151-0221-00 TRANSISTOR :SILICON,PNP,2N577
