Tektronix TDS 380, TDS 360, TDS 340A Service Manual
Service Manual
TDS 340A, TDS 360 & TDS 380
Digital Real-Time Oscilloscopes
070-9435-03
This document applies to firmware version 1.05
and above.
Warning
The servicing instructions are for use by qualified
personnel only. To avoid personal injury, do not
perform any servicing unless you are qualified to
do so. Refer to all safety summaries prior to
performing service.
Copyright T ektronix, Inc. All rights reserved.
T ektronix products are covered by U.S. and foreign patents, issued and pending. Information in this publication supercedes
that in all previously published material. Specifications and price change privileges reserved.
Printed in the U.S.A.
T ektronix, Inc., P.O. Box 1000, Wilsonville, OR 97070–1000
TEKTRONIX and TEK are registered trademarks of T ektronix, Inc.
WARRANTY
T ektronix warrants that the products that it manufactures and sells will be free from defects in materials and workmanship
for a period of three (3) years from the date of purchase from an authorized T ektronix distributor. If any such product
proves defective during this warranty period, T ektronix, at its option, either will repair the defective product without charge
for parts and labor, or will provide a replacement in exchange for the defective product. Batteries are excluded from this
warranty .
In order to obtain service under this warranty, Customer must notify Tektronix of the defect before the expiration of the
warranty period and make suitable arrangements for the performance of service. Customer shall be responsible for
packaging and shipping the defective product to the service center designated by T ektronix, shipping charges prepaid, and
with a copy of customer proof of purchase. T ektronix shall pay for the return of the product to Customer if the shipment is
to a location within the country in which the T ektronix service center is located. Customer shall be responsible for paying
all shipping charges, duties, taxes, and any other charges for products returned to any other locations.
Table of Contents
Specifications
Operating Information
General Safety Summary vii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Service Safety Summary xi. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Preface xiii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
W arranted Characteristics 1–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
T ypical Characteristics 1–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Nominal Traits 1–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Display and Power Controls 2–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Vertical Controls 2–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Horizontal Controls 2–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Trigger Controls 2–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Inputs 2–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Miscellaneous Controls 2–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Display Map 2–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Rear-Panel Connectors 2–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Using the Menu System 2–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Theory of Operation
Logic Conventions 3–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Module Overview 3–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Performance Verification
Conventions 4–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
T est Equipment 4–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
T est Record 4–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Self Test 4–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Functional Test 4–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Performance Tests 4–11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Prerequisites 4–11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Signal Acquisition System Checks 4–11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Time Base System Checks 4–16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Trigger System Checks 4–18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Sine Wave Generator Leveling Procedure 4–20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TDS 340A, TDS 360 & TDS 380 Service Manual
i
Contents
Adjustment Procedures
Maintenance
Equipment Required 5–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
The System Calibration Menu 5–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Attenuator Adjustment 5–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Monitor Adjustments 5–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Preventing ESD 6–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General Care 6–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Inspection and Cleaning Procedures 6–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removal and Replacement 6–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Preparation — Please Read 6–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Line Fuse and Line Cord 6–8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Front Panel Knobs and Shafts 6–10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Rear Cover, Cabinet, and Cabinet Handle 6–11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Disk Drive 6–13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Trim Ring, Menu Elastomer , Menu Buttons, and Front EMI Gaskets 6–14. . . . . . . .
Front Panel Assembly and Menu Flex Circuit 6–16. . . . . . . . . . . . . . . . . . . . . . . . . . .
Main Board Assembly 6–18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Monitor Assembly 6–21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Supply Assembly 6–23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Option 14 Assembly 6–25. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fan and Fan Mount 6–27. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Troubleshooting 6–29. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Onboard Diagnostics 6–29. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Enabling Calibration Menus 6–31. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Troubleshooting Procedure 6–32. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Repackaging Instructions 6–43. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Options
Electrical Parts List
Diagrams
Mechanical Parts List
ii
Options 7–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Standard Accessories 7–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Optional Accessories 7–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Accessory Probes 7–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Accessory Cables 7–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical Parts List 8–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Diagrams 9–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Parts Ordering Information 10–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Using the Replaceable Parts List 10–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TDS 340A, TDS 360 & TDS 380 Service Manual
List of Figures
Contents
Figure 1–1: TDS 340A, TDS 360, & TDS 380 dimensions 1–11. . . . . . . . . .
Figure 2–1: A pop-up menu 2–8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2–2: Using menus 2–9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–1: TDS 340A, TDS360, & TDS380 block diagram 3–2. . . . . . . .
Figure 3–2: TDS 340A, TDS360, & TDS380
block diagram with Option 14 3–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 4–1: Menu locations 4–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 4–2: Verifying adjustments and signal path
compensation 4–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 4–3: Hookup for functional test 4–7. . . . . . . . . . . . . . . . . . . . . . . . .
Figure 4–4: Hookup for file system functional test 4–9. . . . . . . . . . . . . . .
Figure 4–5: Hookup for DC voltage measurement
accuracy check 4–12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 4–6: Hookup for analog bandwidth check 4–14. . . . . . . . . . . . . . . .
Figure 4–7: Measuring analog bandwidth 4–15. . . . . . . . . . . . . . . . . . . . . .
Figure 4–8: Hookup for sample rate check 4–16. . . . . . . . . . . . . . . . . . . . . .
Figure 4–9: Hookup for trigger sensitivity check 4–18. . . . . . . . . . . . . . . . .
Figure 4–10: Measuring trigger sensitivity 4–19. . . . . . . . . . . . . . . . . . . . . .
Figure 4–11: Hookup for sine wave generator leveling 4–21. . . . . . . . . . . .
Figure 5–1: The system calibration menu 5–2. . . . . . . . . . . . . . . . . . . . . . .
Figure 5–2: Timing compensation waveform 5–4. . . . . . . . . . . . . . . . . . . .
Figure 5–3: Attenuator adjustment setup and locations 5–5. . . . . . . . . . .
Figure 5–4: Monitor adjustments 5–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–1: Oscilloscope orientation 6–6. . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–2: Line cord removal 6–8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–3: Line fuse removal 6–9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–4: Knob and shaft removal 6–10. . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–5: Rear cover, cabinet, and cabinet handle
and feet removal 6–12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–6: Removing the disk drive 6–13. . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–7: Trim ring, menu elastomer, and
menu buttons removal 6–14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TDS 340A, TDS 360 & TDS 380 Service Manual
iii
Contents
Figure 6–8: EMI gasket removal and installation 6–16. . . . . . . . . . . . . . . .
Figure 6–9: Front panel assembly and menu
flex circuit removal 6–17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–10: Removing the floppy interface board 6–19. . . . . . . . . . . . . . .
Figure 6–11: Removing the main board 6–20. . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–12: Monitor assembly removal 6–22. . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–13: Low voltage power supply removal 6–24. . . . . . . . . . . . . . . . .
Figure 6–14: Option 14 assembly removal 6–26. . . . . . . . . . . . . . . . . . . . . .
Figure 6–15: Fan and fan mount removal 6–27. . . . . . . . . . . . . . . . . . . . . . .
Figure 6–16: The diagnostics menu 6–29. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–17: The error log 6–31. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–18: Main board cal jumper 6–32. . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–19: Primary troubleshooting procedure 6–33. . . . . . . . . . . . . . . .
Figure 6–20: Module isolation troubleshooting
procedure 6–34. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–21: Front panel/processor troubleshooting
procedure 6–35. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–22: Monitor troubleshooting procedure 6–36. . . . . . . . . . . . . . . .
Figure 6–23: J901 pin 7 signal 6–37. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–24: J901 pin 2 signal 6–37. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–25: J901 pin 5 signal 6–38. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–26: Power supply troubleshooting procedure 6–39. . . . . . . . . . . .
Figure 6–27: Power supply connector locations 6–40. . . . . . . . . . . . . . . . . .
Figure 6–28: Power supply overload troubleshooting
procedure 6–41. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–29: Option 14 I/O interfaces troubleshooting
procedure 6–42. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 10–1: Cabinet and front panel assembly 10–6. . . . . . . . . . . . . . . . . .
Figure 10–2: CRT, power supply, and circuit boards 10–8. . . . . . . . . . . . .
Figure 10–3: Accessories 10–10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
iv
TDS 340A, TDS 360 & TDS 380 Service Manual
List of Tables
Contents
Table 1–1: Warranted characteristics — signal acquisition
system 1–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 1–2: Warranted characteristics — time base system 1–2. . . . . . . .
Table 1–3: Warranted characteristics — triggering system 1–3. . . . . . . .
Table 1–4: Power Requirements 1–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 1–5: Warranted characteristics — environmental 1–4. . . . . . . . . .
Table 1–6: Typical characteristics — signal acquisition system 1–5. . . . .
Table 1–7: Typical characteristics — triggering system 1–6. . . . . . . . . . .
Table 1–8: Typical characteristics — probe compensator output 1–6. . .
Table 1–9: Typical characteristics — data handling 1–7. . . . . . . . . . . . . .
Table 1–10: Nominal traits — signal acquisition system 1–7. . . . . . . . . .
Table 1–11: Nominal traits — time base system 1–8. . . . . . . . . . . . . . . . .
Table 1–12: Nominal traits — triggering system 1–8. . . . . . . . . . . . . . . . .
Table 1–13: Nominal traits — display system 1–9. . . . . . . . . . . . . . . . . . .
Table 1–14: Nominal traits — Option 14 I/O interface option
(TD3F14A) 1–9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 1–15: Nominal traits — power distribution system 1–9. . . . . . . . .
Table 1–16: Nominal traits — mechanical characteristics 1–10. . . . . . . . .
Table 1–17: Certifications and compliances 1–12. . . . . . . . . . . . . . . . . . . . .
Table 4–1: Test equipment 4–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 4–2: DC accuracy 4–11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 5–1: Adjustment equipment 5–1. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 6–1: External inspection check list 6–3. . . . . . . . . . . . . . . . . . . . . . .
Table 6–2: Internal inspection check list 6–4. . . . . . . . . . . . . . . . . . . . . . .
Table 6–3: Tools required for module removal 6–6. . . . . . . . . . . . . . . . . .
Table 6–4: Power supply secondary voltages 6–40. . . . . . . . . . . . . . . . . . . .
TDS 340A, TDS 360 & TDS 380 Service Manual
v
Contents
Table 7–1: VGA output connector pins 7–1. . . . . . . . . . . . . . . . . . . . . . . .
Table 7–2: International power cords 7–2. . . . . . . . . . . . . . . . . . . . . . . . . .
Table 7–3: Language options 7–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 7–4: Standard accessories 7–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 7–5: Optional accessories 7–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 7–6: Accessory cables 7–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 10–1: Certifications and compliances 10–1. . . . . . . . . . . . . . . . . . . . .
vi
TDS 340A, TDS 360 & TDS 380 Service Manual
General Safety Summary
Review the following safety precautions to avoid injury and prevent damage to
this product or any products connected to it. To avoid potential hazards, use the
product only as specified.
Only qualified personnel should perform service procedures.
While using this product, you may need to access other parts of the system. Read
the General Safety Summary in other system manuals for warnings and cautions
related to operating the system.
Injury Precautions
Use Proper Power Cord. To avoid fire hazard, use only the power cord specified
for this product.
Avoid Electric Overload. To avoid electric shock or fire hazard, do not apply a
voltage to a terminal that is outside the range specified for that terminal.
Avoid Overvoltage. To avoid electric shock or fire hazard, do not apply potential
to any terminal, including the common terminal, that varies from ground by
more than the maximum rating for that terminal.
Avoid Electric Shock. To avoid injury or loss of life, do not connect or disconnect
probes or test leads while they are connected to a voltage source.
Ground the Product. This product is grounded through the grounding conductor
of the power cord. To avoid electric shock, the grounding conductor must be
connected to earth ground. Before making connections to the input or output
terminals of the product, ensure that the product is properly grounded.
Do Not Operate Without Covers. To avoid electric shock or fire hazard, do not
operate this product with covers or panels removed.
Use Proper Fuse. To avoid fire hazard, use only the fuse type and rating specified
for this product.
Do Not Operate in Wet/Damp Conditions. To avoid electric shock, do not operate
this product in wet or damp conditions.
Do Not Operate in an Explosive Atmosphere. To avoid injury or fire hazard, do not
operate this product in an explosive atmosphere.
Avoid Exposed Circuitry. To avoid injury, remove jewelry such as rings, watches,
and other metallic objects. Do not touch exposed connections and components
when power is present.
Keep Probe Surface Clean and Dry . To avoid electric shock and erroneous
readings, keep probe surface clean and dry.
TDS 340A, TDS 360 & TDS 380 Service Manual
vii
General Safety Summary
Wear Eye Protection. To avoid eye injury, wear eye protection if there is a
possibility of exposure to high-intensity rays.
Product Damage
Precautions
Symbols and Terms
Use Proper Power Source. Do not operate this product from a power source that
applies more than the voltage specified.
Provide Proper Ventilation. To prevent product overheating, provide proper
ventilation.
Do Not Operate With Suspected Failures. If you suspect there is damage to this
product, have it inspected by qualified service personnel.
Do Not Immerse in Liquids. Clean the probe using only a damp cloth. Refer to
cleaning instructions.
T erms in this Manual. These terms may appear in this manual:
WARNING. Warning statements identify conditions or practices that could result
in injury or loss of life.
CAUTION. Caution statements identify conditions or practices that could result in
damage to this product or other property.
T erms on the Product. These terms may appear on the product:
DANGER indicates an injury hazard immediately accessible as you read the
marking.
WARNING indicates an injury hazard not immediately accessible as you read the
marking.
CAUTION indicates a hazard to property including the product.
viii
TDS 340A, TDS 360 & TDS 380 Service Manual
General Safety Summary
Symbols on the Product. The following symbols may appear on the product:
Certifications and
Compliances
DANGER
High Voltage
Protective Ground
(Earth) T erminal
ATTENTION
Refer to Manual
Double
Insulated
Refer to the specifications section for a listing of certifications and compliances
that apply to this product.
TDS 340A, TDS 360 & TDS 380 Service Manual
ix
General Safety Summary
x
TDS 340A, TDS 360 & TDS 380 Service Manual
Service Safety Summary
Only qualified personnel should perform service procedures. Read this Service
Safety Summary and the General Safety Summary before performing any service
procedures.
Do Not Service Alone. Do not perform internal service or adjustments of this
product unless another person capable of rendering first aid and resuscitation is
present.
Disconnect Power. To avoid electric shock, disconnect the main power by means
of the power cord or, if provided, the power switch.
Use Caution When Servicing the CRT. To avoid electric shock or injury, use
extreme caution when handling the CRT. Only qualified personnel familiar with
CRT servicing procedures and precautions should remove or install the CRT.
CRTs retain hazardous voltages for long periods of time after power is turned off.
Before attempting any servicing, discharge the CRT by shorting the anode to
chassis ground. When discharging the CRT, connect the discharge path to ground
and then the anode. Rough handling may cause the CRT to implode. Do not nick
or scratch the glass or subject it to undue pressure when removing or installing it.
When handling the CRT, wear safety goggles and heavy gloves for protection.
Use Care When Servicing With Power On. Dangerous voltages or currents may
exist in this product. Disconnect power, remove battery (if applicable), and
disconnect test leads before removing protective panels, soldering, or replacing
components.
To avoid electric shock, do not touch exposed connections.
X-Radiation. To avoid x-radiation exposure, do not modify or otherwise alter the
high-voltage circuitry or the CRT enclosure. X-ray emissions generated within
this product have been sufficiently shielded.
TDS 340A, TDS 360 & TDS 380 Service Manual
xi
Service Safety Summary
xii
TDS 340A, TDS 360 & TDS 380 Service Manual
Preface
Manual Structure
This service manual provides service information for the TDS 340A, TDS 360,
and TDS 380 Digitizing Oscilloscopes.
This manual is divided into Chapters such as Specifications and Theory of
Operation. Further, it is divided into subsections such as Product Description
and Removal and Installation Procedures.
Sections containing procedures also contain introductions to those procedures.
Be sure to read these introductions because they provide information needed to
do the service correctly and efficiently. The following is a brief description of
each manual chapter.
Specifications contains a product description of the digitizing oscilloscope
and tables of the characteristics and descriptions that apply to it.
Operating Information includes general information and operating instruc-
tions at the level needed to safely power on and service this oscilloscope.
Theory of Operation contains circuit descriptions that support general service
and fault isolation down to the module level.
Performance Verification contains a collection of procedures for confirming
that this digitizing oscilloscope functions properly and meets warranted
limits.
Adjustment Procedures contains a collection of procedures for adjusting this
digitizing oscilloscope to meet warranted limits.
Maintenance contains information and procedures for doing preventive and
corrective maintenance of the digitizing oscilloscope. Instructions for
cleaning, for module removal and installation, and for fault isolation to a
module are found here.
Options contains information on the factory-installed options that may be
present in your oscilloscope.
Electrical Parts List contains a statement referring you to the Mechanical
Parts List, where both electrical and mechanical modules are listed.
TDS 340A, TDS 360 & TDS 380 Service Manual
xiii
Preface
Manual Conventions
Diagrams contains a statement referring you to the Theory of Operation
Chapter, where module-level block diagrams are listed.
Mechanical Parts List includes a table of all replaceable modules, their
descriptions, and their Tektronix part numbers.
This manual uses certain conventions which you should become familiar with
before doing service.
Modules
Safety
Symbols
Related Manuals
Throughout this manual, any replaceable component, assembly, or part of this
digitizing oscilloscope is referred to generically as a module. In general, a
module is an assembly, like a circuit board, rather than a component, like a
resistor or an integrated circuit. Sometimes a single component is a module; for
example, the chassis of the oscilloscope is a module.
Symbols and terms related to safety appear in the General Safety Summary and
Service Safety Summary found at the beginning of this manual.
Besides the symbols related to safety, this manual uses the following symbols:
STOP. This “stop sign” labels information which you must read in order to
correctly do service and to avoid incorrectly using or applying
service procedures.
These other manuals are available for the TDS 340A, TDS 360, and TDS 380
Digitizing Oscilloscopes.
xiv
The Reference Manual gives you a quick overview of how to operate your
oscilloscope.
The User Manual provides instructions on how to operate your oscilloscope.
The Programmer Manual provides complete information on programming
and remote control of the oscilloscope through the GPIB or RS-232 interface
(optional accessory).
TDS 340A, TDS 360 & TDS 380 Service Manual
Specifications
Accuracy, D
age Measurement,
Average Acquisiti
de
Pulse Resp
Peak Detect and
Envelope Mode
This appendix contains complete specifications for the TDS 340A, TDS 360, and
TDS 380. The specifications are divided into three subsections, one for each of
three classes of traits: Warranted Characteristics, T ypical Characteristics, and
Nominal Traits.
Warranted Characteristics
Warranted characteristics are described in terms of quantifiable performance
limits that are warranted. This subsection lists only warranted characteristics.
NOTE. In these tables, those warranted characteristics that are checked in the
Performance Tests, starting on page 4–11, appear in boldface type under the
column Name.
Performance Conditions
The electrical characteristics found in these tables of warranted characteristics
apply when the oscilloscope has been adjusted at an ambient temperature
between +20_ C and +30_ C, has had a warm-up period of at least 20 minutes,
and is operating at an ambient temperature between –10_ C and +55_ C (unless
otherwise noted).
T able 1–1: Warranted characteristics — signal acquisition system
Name Description
C Volt
on Mo
Accuracy, DC Gain, Sample or
Average Acquisition Modes
onse,
Measurement type DC accuracy
Average of ≥16 waveforms ±(2.0% × |(reading – Net Offset1)| + Offset
Delta volts between any two averages of
≥16 waveforms acquired under the same
setup and ambient conditions
±2%
Sec/Div setting Minimum pulse width
5 s/div – 25 s/div 10 ns
TDS 340A: 10 s/div – 5 ns/div
TDS 360: 10 s/div – 2.5 ns/div
TDS 380: 10 s/div – 1 ns/div
Accuracy + 0.1 div)
±(2.0% × |reading| + 0.15 div + 0.3 mV)
The greater of 10 ns or
.02 × sec/div setting
TDS 340A, TDS 360 & TDS 380 Service Manual
1–1
Specifications
Accuracy, O
T able 1–1: W arranted characteristics — signal acquisition system (Cont.)
Name Description
ffset Volts/Div setting Offset accuracy
2 mV/div – 99.5 mV/div ±(0.4% × |Net Offset1|
+ 3 mV + 0.1 div × V/div setting)
100 mV/div – 995 mV/div ±(0.4% × |Net Offset1|
+ 30 mV + 0.1 div × V/div setting)
1 V/div – 10 V/div ±(0.4% × |Net Offset1|
+ 300 mV + 0.1 div × V/div setting)
Analog Bandwidth, DC Coupled TDS 340A: DC – ≥100 MHz
TDS 360: DC – ≥200 MHz; DC – ≥180 MHz for 2 mV/div
TDS 380: DC – ≥400 MHz; DC – ≥250 MHz for 2 mV/div
Cross T alk (Channel Isolation) ≥100:1 at 50 MHz with equal Volts/Div settings on each channel
Input Impedance, DC-Coupled TDS 340A: 1 MW ±1% in parallel with 20 pF ±2.0 pF
TDS 360: 1 MW ±1% in parallel with 20 pF ±2.0 pF
TDS 380: 1 MW ±1% in parallel with 12 pF ±2.0 pF
Input Voltage, Maximum ±300 V (DC or AC) CAT II; derate at 20 dB/decade above 100 kHz to 13 V peak AC at
3 MHz and above
Lower Frequency Limit, AC Coupled
1
Net Offset = Offset – (Position × Volts/Div). Net offset is the voltage level at the center of the A-D converter dynamic
range. Offset Accuracy is the accuracy of this voltage level.
2
The AC Coupled Lower Frequency Limits are reduced by a factor of 10 when 10X, passive probes are used.
2
≤10 Hz
T able 1–2: Warranted characteristics — time base system
Name Description
Accuracy, Long Term Sample Rate and
Delay Time
Accuracy, Delta Time Measurements
1
For input signals ≥5 divisions in amplitude and a slew rate of ≥2.0 divisions/ns at the delta time measurement points.
Signal must be acquired at a volts/division setting ≥5 mV/division.
2
The WI (waveform interval) is the time between the samples in the waveform record. Also, see the footnotes for Sample
Rate Range and Equivalent Time or Interpolated Waveform Rates in Table 1–11 on page 1–8.
1–2
±100 ppm over any ≥1 ms interval
1, 2
For single-shot acquisitions using sample acquisition mode and a bandwidth limit setting
of FULL:
±(1 WI + 100 ppm × |Reading| + 0.6 ns)
For repetitive acquisitions using average acquisition mode with ≥16 averages and a
bandwidth limit setting of FULL:
±(1 WI + 100 ppm × |Reading| + 0.4 ns)
TDS 340A, TDS 360 & TDS 380 Service Manual
T able 1–3: Warranted characteristics — triggering system
Accuracy, Trigger Level, D
upled
Sensitivity, Edge-Type Trigger, D
upled
Name Description
Specifications
Co
C Co
Trigger source Sensitivity
CH1 or CH2 ±(3% of |Setting – Net Offset1| + 0.2 div ×
volts/div setting + Offset Accuracy)
External ±(6% of |Setting| + 20 mV)
External/10 ±(6% of |Setting| + 200 mV)
C
Trigger source Sensitivity
CH1 or CH2 TDS 340A: 0.35 division from DC to 20
MHz, increasing to 1 div at 100 MHz
TDS 360: 0.35 division from DC to 50 MHz,
increasing to 1 div at 200 MHz
TDS 380: 0.35 division from DC to 50 MHz,
increasing to 1 div at 400 MHz
External TDS 340A: 50 mV from DC to 20 MHz,
increasing to 150 mV at 100 MHz
TDS 360: 50 mV from DC to 50 MHz,
increasing to 150 mV at 200 MHz
TDS 380: 50 mV from DC to 50 MHz,
increasing to 500 mV at 400 MHz
External/10 TDS 340A: 500 mV from DC to 20 MHz,
increasing to 1.5 V at 100 MHz
TDS 360: 500 mV from DC to 50 MHz,
increasing to 1.5 V at 200 MHz
TDS 380: 500 mV from DC to 50 MHz,
increasing to 5.0 V at 400 MHz
Input Impedance, External Trigger 1 MW ±2% in parallel with 20 pF ±2 pF
Maximum Input Voltage,
External Trigger
1
Net Offset = Offset – (Position × Volts/Div). Net Offset is the voltage level at the center of the A-D converter dynamic
±300 V (DC or AC) CAT II; derate at 20 dB/decade above 100 kHz to 13 V peak AC at
3 MHz and above
range. Offset Accuracy is the accuracy of this voltage level.
T able 1–4: Power Requirements
Name Description
Source Voltage and Frequency
90 to 132 VAC
132 to 250 VAC
Power Consumption ≤65 Watts (120 VA)
, continuous range, for 47 Hz through 440 Hz
RMS
, continuous range, for 47 Hz through 63 Hz
RMS
TDS 340A, TDS 360 & TDS 380 Service Manual
1–3
Specifications
T able 1–5: W arranted characteristics — environmental
Name Description
Atmospherics (TDS 340A, TDS 360 or
TDS 380)
Dynamics Random vibration without diskette in floppy disk drive:
Temperature without diskette in floppy disk drive:
+4_ C to +50_ C, operating;
–22_ C to +60_ C, non-operating
Temperature with diskette in floppy disk drive:
+10_ C to +50_ C, operating or non-operating
Relative humidity without diskette in floppy disk drive:
to 80% at or below +29_ C, or to 20% from +30_ C to +50_ C, operating;
to 90% at or below +40_ C, or to 5% from +41_ C to +50_ C, non-operating;
Relative humidity with diskette in floppy disk drive:
to 80% at or below +29_ C, or to 20% from +30_ C to +50_ C, operating or
non-operating
Altitude:
To 15,000 ft (4570 m), operating;
to 40,000 ft (12190 m), non-operating
0.31 g
2.46 g
, from 5 to 500 Hz, 10 minutes each axis, operating;
RMS
, from 5 to 500 Hz, 10 minutes each axis, non-operating
RMS
1–4
TDS 340A, TDS 360 & TDS 380 Service Manual
Typical Characteristics
Accurac
oltage Measurement
isitio
e
ettli
rror
Div
Step
g
amplitude
Typical characteristics are described in terms of typical or average performance.
Typical characteristics are not warranted.
T able 1–6: Typical characteristics — signal acquisition system
Name Description
Specifications
Accuracy, DC Gain, Envelope
Acquisition Mode
y, DC V
Sample Acqu
Frequency Limit, Upper , 20 MHz Bandwidth Limited
Step Response S
Common Mode Rejection Ratio (CMRR) 100:1 at 60 Hz, reducing to 20:1 at 50 MHz, with equal Volts/Div and Coupling settings
1
Net Offset = Offset – (Position × Volts/Div). Net Offset is the voltage level at the center of the A-D converter dynamic
range. Offset Accuracy is the accuracy of this voltage level.
2
The samples must be acquired under the same setup and ambient conditions.
3
The values given are the maximum absolute difference between the value at the end of a specified time interval after the
mid-level crossing of the step, and the value one second after the mid-level crossing of the step, expressed as a
percentage of the step amplitude.
n Mod
ng E
,
±3% for sec/div settings from 5 Sec/Div to 25 sec/div;
±2% for sec/div settings from 10 s/div to 5 ns/div (TDS 340A);
±2% for sec/div settings from 10 s/div to 2.5 ns/div (TDS 360);
±2% for sec/div settings from 10 s/div to 1 ns/div (TDS 380)
Measurement type DC accuracy
Any Sample ±(2.0% × (|reading – Net Offset1|) + Offset
Accuracy + 0.13 div + 0.6 mV)
Delta Volts between any two samples
acquired under the same setup and
ambient conditions
20 MHz
Volts/
settin
2 mV/div – 99.5 mV/div ≤2 V ≤1.0 ≤0.1
100 mV/div – 995 mV/div ≤20 V ≤1.5 ≤0.2
1 V/div – 10 V/div ≤200 V ≤2.5 ≤0.2
on each channel.
2
±(2.0% × |reading| + 0.26 div + 1.2 mV)
Settling error (%)
100 ns 20 ms
3
TDS 340A, TDS 360 & TDS 380 Service Manual
1–5
Specifications
rror
Positio
eri
sitivit
er
sitivit
Not
3
Output Voltage
Probe Compensator
T able 1–7: Typical characteristics — triggering system
Name Description
E
, Trigger
n, Edge Trigg
ng Acquire mode Trigger-position error
Sample, Average ±(1 WI + 2 ns)
Peak Detect, Envelope ±(2 WI + 2 ns)
Sen
Lowest Frequency for Successful Operation
y, Video-Type Trigg
Source Typical sensitivity
CH1 or CH2
External
External/10
0.6 division of video sync signal
75 mV of video sync signal
750 mV of video sync signal
50 Hz
of “Set Level to 50%” Function
Sen
Coupled
y, Edge Type Trigger,
DC
Trigger coupling Typical signal level for stable triggering
AC Same as DC-coupled limits4 for frequencies above
60 Hz. Attenuates signals below 60 Hz.
Noise Reject Three and one half times the DC-coupled limits.
High Frequency Reject One and one half times times the DC-coupled limits
from DC to 30 kHz. Attenuates signals above 30 kHz.
Low Frequency Reject One and one half times the DC-coupled limits4 for
frequencies above 80 kHz. Attenuates signals below
80 kHz.
1
The trigger position errors are typically less than the values given here. These values are for triggering signals having a
slew rate at the trigger point of ±0.5 division/ns.
2
The waveform interval (WI) is the time between the samples in the waveform record. Also, see the footnote for the
characteristics Sample Rate Range and Equivalent Time or Interpolated Waveform Rates in Table 1–11 on page 1–8.
3
The minimum sensitivity for obtaining a stable trigger. A stable trigger results in a uniform, regular display triggered on
the selected slope. The trigger point must not switch between opposite slopes on the waveform, and the display must not
“roll” across the screen on successive acquisitions. The TRIG’D LED stays constantly lighted when the SEC/DIV setting
is 2 ms or faster but may flash when the SEC/DIV setting is 10 ms or slower.
4
See the characteristic Sensitivity, Edge-T ype T rigger, DC Coupled in Table 1–3, which begins on page 1–3.
1,2
4
4
T able 1–8: Typical characteristics — probe compensator output
Name Description
1–6
and Frequency,
Characteristic
Voltage 5.0 V (low-high) into a 1 MW load
Frequency 1 kHz
TDS 340A, TDS 360 & TDS 380 Service Manual
T able 1–9: Typical characteristics — data handling
set, All
els
Name Description
Specifications
Time, Data-Retention, Nonvolatile
1,2
Memory
1
The time that reference waveforms, stored setups, and calibration constants are retained when there is no power to the
oscilloscope.
2
Data is maintained by a lithium poly-carbon monofluoride battery.
≥5 Y ears
Nominal Traits
Nominal traits are described using simple statements of fact such as “Two,
identical” for the trait “Input Channels, Number of,” rather than in terms of
limits that are performance requirements.
T able 1–10: Nominal traits — signal acquisition system
Name Description
Bandwidth Selections 20 MHz and FULL
Digitizers, Number of Two, identical, digitized simultaneously
Digitized Bits, Number of 8 bits
Input Channels, Number of Two, identical, called CH 1 and CH 2
Input Coupling DC, AC, or GND
Ranges, Off
Range, Position ±5 divisions
Range, Sensitivity
Rise Time TDS 340A: 3.5 ns
T ekProbe Interface Level one probe coding
1
Displayed vertically with 25 digitization levels (DLs) per division and 10.24 divisions dynamic range with zoom off. A DL
is the smallest voltage level change that the 8-bit A-D Converter can resolve, with the input scaled to the volts/division
setting of the channel used. Expressed as a voltage, a DL is equal to 1/25 of a division times the volts/division setting.
2
The sensitivity ranges from 2 mV/div to 10 V/div in a 1–2–5 sequence of coarse settings. Between consecutive coarse
settings, the sensitivity can be finely adjusted with a resolution of 1% of the more sensitive setting. For example, between
50 mV/div and 100 mV/div, the volts/division can be set with 0.5 mV resolution.
Chann
2
1
Volts/Div setting Offset range
2 mV/div – 99.5 mV/div ±1 V
100 mV/div – 995 mV/div ±10 V
1 V/div – 10 V/div ±100 V
2 mV/div to 10 V/div
TDS 360: 1.75 ns
TDS 380: 875 ps
TDS 340A, TDS 360 & TDS 380 Service Manual
1–7
Specifications
evel
T able 1–11: Nominal traits — time base system
Name Description
Range, Sample-Rate
Range, Seconds/Division TDS 340A: 5 ns/div to 5 s/div in a 1–2.5–5 sequence
Range, Time Base Delay Time 16.5 ns to 50 seconds
Record Length 1,000 samples
1
The range of real-time rates, expressed in samples/second, at which a digitizer samples signals at its inputs and stores
the samples in memory to produce a record of time-sequential samples
2
The Waveform Rate (WR) is the equivalent sample rate of a waveform record. For a waveform record acquired by
real-time sampling of a single acquisition, the waveform rate is the same as the real-time sample rate; for a waveform
created by interpolation of real-time samples from a single acquisition or by equivalent-time sampling of multiple
acquisitions, the waveform rate is faster than the real time sample rate. For all three cases, the waveform rate is
1/(Waveform Interval) for the waveform record, where the waveform interval (WI) is the time between the samples in the
waveform record.
1,2
TDS 340A: 10 Samples/s to 500 MSamples/s in a 1–2–5 sequence
TDS 360: 10 Samples/s to 1 GSamples/s in a 1–2–5 sequence
TDS 380: 10 Samples/s to 2 GSamples/s in a 1–2–5 sequence
TDS 360: 2.5 ns/div to 5 s/div in a 1–2.5–5 sequence
TDS 380: 1 ns/div to 5 s/div in a 1–2.5–5 sequence
T able 1–12: Nominal traits — triggering system
Name Description
Range, Hold Off 500 ns minimum to 10 seconds maximum
Ranges, Trigger L
Formats and Field Rates, Video Trigger Triggers from sync-negative composite video, 525 to 625 lines, 50 Hz to 60 Hz, interlaced
TekProbe Interface, External Trigger Level one probe coding
Source Range
Any Channel ±12 divisions from center of screen
External ±1.5 Volts
External /10 ±15 Volts
Line ±300 Volts
or noninterlaced systems with scan rates from 15 kHz to 65 kHz – such as NTSC, PAL, or
SECAM
1–8
TDS 340A, TDS 360 & TDS 380 Service Manual
Specifications
T able 1–13: Nominal traits — display system
Name Description
CRT Type 7-inch (17.95 cm) diagonal, magnetic deflection; horizontal raster-scan; P31 green
phosphor
Video Display Resolution 640 pixels horizontally by 480 pixels vertically
Display area is 5.04 inch (12.92 cm) horizontally by 3.78 inch (9.69 cm) vertically
Waveform Display Graticule A single graticule 401 × 501 pixels (8 × 10 divisions, with divisions that are approximately
1 cm by 1 cm)
Intensity Levels Dim and Bright, with adjustable Overall Intensity and Contrast
T able 1–14: Nominal traits — I/O interface option
Name Description
GPIB Part of Option 14 I/O interface or TD3F14A I/O interface field upgrade kit; complies with
IEEE Std 488–1987
RS-232 Part of Option 14 I/O interface or TD3F14A I/O interface field upgrade kit; a 9-pin male
DTE RS-232 interface that complies with EIA/TIA 574–90
Centronics Part of Option 14 I/O interface or TD3F14A I/O interface field upgrade kit; a 25-pin, IBM
PC-type, parallel printer interface that complies electrically with Centronics C332–44,
Rev A
Video Signal Output
(Option 14 Only)
DB-9 rear panel Video connector; non-interlaced, with levels that comply with ANSI
RS343A
VGA compatible at a 30.6 kHz sync rate
Power Supply, Printer
(Option 14 Only)
Power supply connector to supply power to the Option 3P Printer Pack
T able 1–15: Nominal traits — power distribution system
Name Description
Fuse Rating
5 mm × 20 mm, 3.15 A (T), 250 V; or 1.25 in × 0.25 in, 3 A (T), 250 V
TDS 340A, TDS 360 & TDS 380 Service Manual
1–9
Specifications
T able 1–16: Nominal traits — mechanical characteristics
Name Description
Weight
Standard 7.0 kg (15.5 lbs) stand-alone instrument;
8.6 kg (19 lbs) with front cover, accessories, and accessories pouch installed;
12.9 kg (28.5 lbs) when packaged for domestic shipment
Rackmount 6.6 kg (14.5 lbs), plus weight of rackmount parts (Option 1R);
14.7 kg (32.5 lbs) when the oscilloscope is packaged for domestic shipment
Rackmount conversion kit 4.5 kg (10 lbs); 7.5 kg (17.5 lbs) when kit is packaged for domestic shipment
Overall Dimensions
Standard Instrument (Figure 1–1) Height: 191 mm (7.5 in) with feet and accessories pouch installed
165 mm (6.5 in) without the accessories pouch installed
Width: 362 mm (14.25 in) with handle
Depth: 471 mm (18.55 in) stand-alone instrument
490 mm (19.28 in) with front cover installed
564 mm (22.2 in) with handle extended
Rackmount Instrument Height: 178 mm (7 in)
Width: 483 mm (19 in)
Depth: 472 mm (18.6 in) without handles; 517 mm (20.35 in) including handles
1–10
TDS 340A, TDS 360 & TDS 380 Service Manual
Specifications
308.1 mm
(12.13 in.)
471 mm
(18.55 in.)
327.2 mm
(12.88 in.)
165 mm
(6.5 in.)
569 mm
(22.4 in.)
Figure 1–1: TDS 340A, TDS 360, & TDS 380 dimensions
TDS 340A, TDS 360 & TDS 380 Service Manual
381 mm
(15 in.)
1–11
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