Tektronix 1503C Service Manual
Service Manual
1503C
Metallic Time-Domain Reflectometer
070-7170-05
This document applies to firmware version 5.04
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.
www.tektronix.com
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.
T ektronix, Inc., P.O. Box 500, Beaverton, OR 97077
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 one (1) year from the date of shipment. If a 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.
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, with shipping charges prepaid.
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.
This warranty shall not apply to any defect, failure or damage caused by improper use or improper or inadequate
maintenance and care. T ektronix shall not be obligated to furnish service under this warranty a) to repair damage resulting
from attempts by personnel other than T ektronix representatives to install, repair or service the product; b) to repair
damage resulting from improper use or connection to incompatible equipment; c) to repair any damage or malfunction
caused by the use of non-T ektronix supplies; or d) to service a product that has been modified or integrated with other
products when the effect of such modification or integration increases the time or difficulty of servicing the product.
THIS WARRANTY IS GIVEN BY TEKTRONIX IN LIEU OF ANY OTHER WARRANTIES, EXPRESS OR
IMPLIED. TEKTRONIX AND ITS VENDORS DISCLAIM ANY IMPLIED WARRANTIES OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. TEKTRONIX’ RESPONSIBILITY TO
REP AIR OR REPLACE DEFECTIVE PRODUCTS IS THE SOLE AND EXCLUSIVE REMEDY PROVIDED TO
THE CUSTOMER FOR BREACH OF THIS WARRANTY. TEKTRONIX AND ITS VENDORS WILL NOT BE
LIABLE FOR ANY INDIRECT , SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES IRRESPECTIVE
OF WHETHER TEKTRONIX OR THE VENDOR HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH
DAMAGES.
Table of Contents
General Safety Summary xiii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Service Safety Summary xv. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General Information xvii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation and Repacking xviii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Contacting T ektronix xiv. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Instructions
Operating Instructions 1–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Overview 1–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Preparing to Use the 1503C 1–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Display 1–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Front-Panel Controls 1–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Menu Selections 1–8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
T est Preparations 1–11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cable T est Procedure 1–13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Additional Features (Menu Selected) 1–25. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operator Performance Checks
Operator Performance Checks 2–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Specifications
Specifications 3–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical Characteristics 3–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Environmental Characteristics 3–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Physical Characteristics 3–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Options and Accessories
Options and Accessories 4–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Option 04: YT–1 Chart Recorder 4–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Option 05: Metric Default 4–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Option 06: EthernetR 4–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Option 07: YT–1S Chart Recorder 4–16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Option 08: T oken Ring Adapter 4–17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Option 09: Universal Service Ordering Code 4–17. . . . . . . . . . . . . . . . . . . . . . . . . . .
Option 10: T oken Ring Interface 4–17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Cord Options 4–18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Accessories 4–19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1503C MTDR Service Manual
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Table of Contents
Circuit Descriptions
Circuit Descriptions 5–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Introduction 5–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Supply 5–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Processor System 5–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Option Port Interface 5–10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Video Processor 5–13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Timebase 5–15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pulse Generator/Sampler 5–23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Front Panel 5–25. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Display Module 5–29. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Option 06 (EthernetR) 5–41. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Calibration and Adjustments
Calibration 6–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Introduction 6–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Calibration Performance Check 6–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Display Module Check 6–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Front Panel Check 6–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Horizontal Scale (Timebase) Check 6–8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Vertical Position (Offset) Check 6–10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Noise Check 6–12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Impedance Check 6–14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Offset/Gain Check 6–14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RAM/ROM Check 6–15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pulse Balance Check 6–16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pulse Width Check 6–17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Auto Pulse Select Check 6–20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Jitter Check 6–21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Aberrations Check 6–23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pulse Amplitude Check 6–27. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Option 04/07: YT-1/YT-1S Chart Recorder Check 6–30. . . . . . . . . . . . . . . . . . . . . . .
Option 05: Metric Default Check 6–31. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Option 06: EthernetR Adapter Checks 6–31. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Adjustment Procedures 6–37. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Visual Inspection 6–38. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Supply Checks and Adjustments 6–38. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Main Board "12 VDC Check and Adjust 6–42. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
LCD Check and Adjustment 6–46. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pulser/Sampler Voltage Check 6–49. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Sampling Efficiency Adjustment 6–51. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1st Blow-By Compensation Adjustment 6–54. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output Impedance Check 6–56. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Option 06: EthernetR Adapter Adjustments 6–58. . . . . . . . . . . . . . . . . . . . . . . . . . . .
After Adjustments are Completed 6–59. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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1503C MTDR Service Manual
Maintenance
Maintenance 7–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Introduction 7–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Preventive Maintenance 7–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Part Removal and Replacement 7–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Troubleshooting 7–13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Control Panel Installation 7–18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installing the Case Cover Over the Chassis 7–19. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Replaceable Electrical Parts
Replaceable Electrical Parts 8–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Diagrams
Diagrams 9–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table of Contents
Replaceable Mechanical Parts
Replaceable Mechanical Parts 10–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Glossary
Index
1503C MTDR Service Manual
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Table of Contents
List of Figures
Figure 1–1: Rear Panel Voltage Selector, Fuse, AC Receptacle 1–1. . . . .
Figure 1–2: Display Showing Low Battery Indication 1–4. . . . . . . . . . . .
Figure 1–3: 1503C Front-Panel Controls 1–5. . . . . . . . . . . . . . . . . . . . . .
Figure 1–4: Display and Indicators 1–6. . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 1–5: Vp Set at .30, Cursor Beyond Reflected Pulse
(Setting Too Low) 1–12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 1–6: Vp Set at .99, Cursor Less Than Reflected Pulse
(Setting Too High) 1–13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 1–7: Vp Set at .66, Cursor on Rising Edge of Reflected Pulse
(Set Correctly) 1–13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 1–8: 20-ft Cable at 5 ft/div 1–14. . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 1–9: Short in the Cable 1–14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 1–10: Open in the Cable 1–15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 1–11: 455-ft Cable 1–15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 1–12: 455-ft Cable with 20 ft/div, Cursor Off Screen 1–16. . . . . . . .
Figure 1–13: Return Loss 1–16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 1–14: Reflection Adjusted to One Division in Height 1–17. . . . . . .
Figure 1–15: Display with VIEW INPUT Turned Off 1–18. . . . . . . . . . . . .
Figure 1–16: Display of a Stored Waveform 1–19. . . . . . . . . . . . . . . . . . . .
Figure 1–17: Display of a Stored Waveform and Current Waveform 1–19.
Figure 1–18: Display of a Stored Waveform, Current Waveform,
and Difference Waveform 1–20. . . . . . . . . . . . . . . . . . . . . . . .
Figure 1–19: Waveform Moved to Top Half of Display 1–20. . . . . . . . . . . .
Figure 1–20: Current Waveform Centered, Stored Waveform
Above 1–21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 1–21: Current Waveform Center, Stored Waveform Above,
Difference Below 1–21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 1–22: Waveform of Three-Foot Lead-in Cable 1–22. . . . . . . . . . . . .
Figure 1–23: Cursor Moved to End of Three-Foot Lead-in Cable 1–23. . . .
Figure 1–24: Cursor Moved to End of Three-Foot Lead-in Cable 1–23. . . .
Figure 1–25: Cursor Moved to 0.00 ft 1–24. . . . . . . . . . . . . . . . . . . . . . . . .
Figure 1–26: Incident Pulse at Four Divisions, FILTER at
Desired Setting 1–24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 1–27: Waveform Viewed in Normal Operation 1–25. . . . . . . . . . . . .
Figure 1–28: Waveform Showing Intermittent Short 1–26. . . . . . . . . . . . . .
Figure 1–29: Waveform Display with No Outgoing Pulses 1–26. . . . . . . . .
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1503C MTDR Service Manual
Table of Contents
Figure 1–30: A Captured Single Sweep 1–27. . . . . . . . . . . . . . . . . . . . . . . .
Figure 2–1: Start-up Measurement Display 2–2. . . . . . . . . . . . . . . . . . . .
Figure 2–2: Measurement Display with 10-foot Cable 2–2. . . . . . . . . . .
Figure 2–3: Cursor at End of 10-foot Cable 2–3. . . . . . . . . . . . . . . . . . . .
Figure 2–4: Cursor at End of 10-foot Cable, Vp Set to .30 2–3. . . . . . . .
Figure 2–5: Flatline Display Out to 50,000+ Feet 2–4. . . . . . . . . . . . . . .
Figure 2–6: Waveform Off the Top of the Display 2–4. . . . . . . . . . . . . . .
Figure 2–7: Waveform at the Bottom of the Display 2–5. . . . . . . . . . . . .
Figure 2–8: Waveform with Gain at 57 dB 2–5. . . . . . . . . . . . . . . . . . . . .
Figure 2–9: Distance at –2.00 ft 2–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2–10: Pulse Adjusted to Four Major Divisions in Height 2–7. . . . .
Figure 2–11: Waveform Centered, Cursor at 10.00 ft 2–8. . . . . . . . . . . . .
Figure 2–12: Pulse Adjusted to Four Major Divisions in Height 2–8. . . . .
Figure 2–13: Aberrations Less Than Four Divisions Out to
30.00 ft 2–9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2–14: Pulse Adjusted to Four Major Divisions in Height 2–9. . . . .
Figure 2–15: Aberrations Less Than Four Divisions Out to
300.00 ft 2–10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2–16: Pulse Adjusted to Four Major Divisions in Height 2–10. . . . .
Figure 2–17: Aberrations Less Than Four Divisions Out to
3000.00 ft 2–11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 4–1: A Typical Ethernet System 4–2. . . . . . . . . . . . . . . . . . . . . . .
Figure 4–2: N-Type Male T-Connector 4–5. . . . . . . . . . . . . . . . . . . . . . .
Figure 4–3: N-Type Female T-Connector 4–5. . . . . . . . . . . . . . . . . . . . . .
Figure 4–4: System 1 – Tap Hidden by Traffic
(1 avg, 50 ft/div. 35 dB) 4–10. . . . . . . . . . . . . . . . . . . . . . . . .
Figure 4–5: System 1 – Traffic and Tap Nearly Identical
(4 avg, 50 ft/div, 35 dB) 4–10. . . . . . . . . . . . . . . . . . . . . . . . .
Figure 4–6: System 1 – Tap Becoming Visible
(16 avg, 50 ft/div, 35 dB) 4–11. . . . . . . . . . . . . . . . . . . . . . . .
Figure 4–7: System 1 – Tap Quite Visible
(128 avg, 50 ft/div, 35 dB) 4–11. . . . . . . . . . . . . . . . . . . . . . .
Figure 4–8: System 1 – No Traffic
(1 avg, 50 ft/div, 35 dB) 4–11. . . . . . . . . . . . . . . . . . . . . . . . .
Figure 4–9: System 1 – Tap Expanded, No Traffic
(1 avg, 2 ft/div, 35 dB) 4–12. . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 4–10: System 2 – Cable w/ Revision One Repeater
(1 avg, 200ft/div, 2.25dB) 4–12. . . . . . . . . . . . . . . . . . . . . . . .
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Table of Contents
Figure 4–11: System 2 – First Tap, No Traffic
(1 avg, 1 ft/div, 44.5 dB) 4–12. . . . . . . . . . . . . . . . . . . . . . . . .
Figure 4–12: System 2 – Same Tap with 5% Traffic
(1 avg, 1 ft/div, 44.5 dB) 4–13. . . . . . . . . . . . . . . . . . . . . . . . .
Figure 4–13: System 2 – Same Tap, Increased Averaging
(16 avg, 1 ft/div, 44.5 dB) 4–13. . . . . . . . . . . . . . . . . . . . . . . .
Figure 4–14: System 2 – Farther Out, More Gain
(128 avg, 10 ft/div, 53.5 dB) 4–13. . . . . . . . . . . . . . . . . . . . . .
Figure 4–15: System 2 – 1000-ft Cable at 10 ns
(128 avg, 100 ft/div, 43.75 dB) 4–14. . . . . . . . . . . . . . . . . . . .
Figure 4–16: System 2 – Previous Waveform Expanded
(128 avg, 20 ft/div, 54.75 dB) 4–14. . . . . . . . . . . . . . . . . . . . .
Figure 4–17: System 2 – Next Group of Taps
(128 avg, 20 ft/div, 54.75 dB) 4–14. . . . . . . . . . . . . . . . . . . . .
Figure 4–18: System 2 – Group of Taps Expanded
(128 avg, 10 ft/div, 54.75 dB) 4–15. . . . . . . . . . . . . . . . . . . . .
Figure 4–19: System 2 – Another Group of Taps
(128 avg, 10 ft/div, 54.75 dB) 4–15. . . . . . . . . . . . . . . . . . . . .
Figure 4–20: System 2 – End of Cable
(128 avg, 20 ft/div, 61.25 dB) 4–15. . . . . . . . . . . . . . . . . . . . .
Figure 4–21: Typical Frequency Response Curve with
EthernetR Option 06 4–16. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 5–1: System Block Diagram 5–2. . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 5–2: Waveform Accumulation Diagram 5–3. . . . . . . . . . . . . . . . .
Figure 5–3: Power Supply Block Diagram 5–4. . . . . . . . . . . . . . . . . . . . .
Figure 5–4: Processor Block Diagram 5–8. . . . . . . . . . . . . . . . . . . . . . . .
Figure 5–5: Option Port Interface Block Diagram 5–11. . . . . . . . . . . . . . .
Figure 5–6: Video Processor Block Diagram 5–13. . . . . . . . . . . . . . . . . . .
Figure 5–7: Video Processor Output 5–15. . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 5–8: Timebase Block Diagram 5–16. . . . . . . . . . . . . . . . . . . . . . . .
Figure 5–9: Timebase Control 5–17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 5–10: Combined Effects of Time Delay 5–18. . . . . . . . . . . . . . . . . .
Figure 5–11: Calibration of Delay Zero and 50-ns Analog Delay 5–19. . . .
Figure 5–12: Pulse Generator/Sampler Block Diagram 5–23. . . . . . . . . . . .
Figure 5–13: Front Panel Block Diagram 5–26. . . . . . . . . . . . . . . . . . . . . . .
Figure 5–14: Display Module Block Diagram 5–29. . . . . . . . . . . . . . . . . . .
Figure 5–15: SBE Cell 5–31. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 5–16: Row Driver Block Diagram 5–31. . . . . . . . . . . . . . . . . . . . . .
Figure 5–17: Column Driver Block Diagram 5–32. . . . . . . . . . . . . . . . . . . .
Figure 5–18: Row Timing Diagram 5–33. . . . . . . . . . . . . . . . . . . . . . . . . . .
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1503C MTDR Service Manual
Table of Contents
Figure 5–19: Column Timing Diagram 5–35. . . . . . . . . . . . . . . . . . . . . . . .
Figure 5–20: Shift Register 5–36. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 5–21: CPU and Display Memory Interface 5–39. . . . . . . . . . . . . . . .
Figure 5–22: Option 06 (EthernetR) Block Diagram 5–41. . . . . . . . . . . . .
Figure 6–1: Typical Start-Up Display 6–2. . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–2: Waveform on the Display 6–2. . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–3: Setup Menu 6–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–4: Main Menu 6–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–5: Diagnostics Menu 6–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–6: Front Panel Diagnostic Display 6–5. . . . . . . . . . . . . . . . . . . .
Figure 6–7: Front Panel Diagnostic Display 6–6. . . . . . . . . . . . . . . . . . . .
Figure 6–8: Front Panel Diagnostic Display 6–7. . . . . . . . . . . . . . . . . . . .
Figure 6–9: Front Panel Diagnostic Display 6–7. . . . . . . . . . . . . . . . . . . .
Figure 6–10: Waveform on the Display with No Cable Attached 6–8. . . .
Figure 6–11: Waveform on the Display with 10-ft Cable Attached 6–8. . .
Figure 6–12: Cursor on Rising Edge of Reflected Pulse at 5 ft/div 6–9. . .
Figure 6–13: Cursor on Rising Edge of Reflected Pulse at 1 ft/div 6–9. . .
Figure 6–14: Cursor on Rising Edge of Reflected Pulse with
Vp at .84 6–9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–15: Flatline Display to >50,000 ft 6–10. . . . . . . . . . . . . . . . . . . . .
Figure 6–16: Waveform at Top of the Display 6–11. . . . . . . . . . . . . . . . . .
Figure 6–17: Waveform at Bottom of the Display 6–11. . . . . . . . . . . . . . . .
Figure 6–18: Waveform at Center of the Display 6–11. . . . . . . . . . . . . . . . .
Figure 6–19: Distance Moved Beyond Trailing Edge of Pulse 6–12. . . . . .
Figure 6–20: Noise with Gain at 57 dB 6–13. . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–21: Noise Diagnostic Display 6–13. . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–22: Service Diagnostic Menu 6–14. . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–23: Service Diagnostic Menu 6–14. . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–24: Service Diagnostic Menu 6–15. . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–25: Pulse Appx. Five Divisions High 6–16. . . . . . . . . . . . . . . . . .
Figure 6–26: Current Waveform Shifted from Stored Waveform 6–17. . . .
Figure 6–27: Initial Pulse 6–18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–28: Pulse Adjusted to Six Divisions High 6–18. . . . . . . . . . . . . . .
Figure 6–29: Cursor on Leading Edge at Center Graticule 6–19. . . . . . . . .
Figure 6–30: Cursor on Trailing Edge at Center Graticule 6–19. . . . . . . . .
Figure 6–31: Initial Pulse with Cursor at 0.00 ft 6–20. . . . . . . . . . . . . . . . .
Figure 6–32: Waveform on Auto Pulse Select 6–21. . . . . . . . . . . . . . . . . . .
Figure 6–33: Initial Pulse Centered on Horizontal Graticule 6–21. . . . . . . .
1503C MTDR Service Manual
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Table of Contents
Figure 6–34: Gain Increased to 30.00 dB 6–22. . . . . . . . . . . . . . . . . . . . . . .
Figure 6–35: Jitter Apparent Using Max Hold 6–22. . . . . . . . . . . . . . . . . . .
Figure 6–36: Cursor at –2.00 ft 6–23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–37: Pulse Height at Four Divisions at 1 ft/div 6–24. . . . . . . . . . . .
Figure 6–38: Gain Increased to 25.00 dB 6–24. . . . . . . . . . . . . . . . . . . . . . .
Figure 6–39: Pulse Height at Four Divisions at 2 ft/div 6–25. . . . . . . . . . . .
Figure 6–40: Gain Increased to 30.00 dB 6–25. . . . . . . . . . . . . . . . . . . . . . .
Figure 6–41: Pulse Height at Four Divisions at 50 ft/div 6–26. . . . . . . . . . .
Figure 6–42: Gain Increased to 30.00 dB 6–26. . . . . . . . . . . . . . . . . . . . . . .
Figure 6–43: Pulse Height at Four Divisions at 500 ft/div 6–27. . . . . . . . . .
Figure 6–44: Gain Increased to 30.00 dB 6–27. . . . . . . . . . . . . . . . . . . . . . .
Figure 6–45: Oscilloscope Waveform 6–28. . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–46: 1503C Waveform of 1000-ns Pulse 6–29. . . . . . . . . . . . . . . .
Figure 6–47: 1503C Waveform of 100-ns Pulse 6–29. . . . . . . . . . . . . . . . .
Figure 6–48: 1503C Waveform of 2-ns Pulse 6–30. . . . . . . . . . . . . . . . . . .
Figure 6–49: Head Alignment Chart Print 6–30. . . . . . . . . . . . . . . . . . . . . .
Figure 6–50: Equipment Setup 6–32. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–51: Main Menu 6–32. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–52: Ethernet Menu 6–33. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–53: Ethernet Menu 6–33. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–54: Ethernet Menu 6–34. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–55: Ethernet Menu 6–34. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–56: Ethernet Menu 6–35. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–57: Circuit Board Locations in the Instrument 6–37. . . . . . . . . . .
Figure 6–58: Power Supply Board 6–39. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–59: Power Supply Test Points TP1020 and TP1010 6–39. . . . . .
Figure 6–60: Power Supply Test Point TP2030 6–40. . . . . . . . . . . . . . . . .
Figure 6–61: Connector Plug P5040 and Pins J5040 on Bottom of
Main Board 6–40. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–62: Power Supply Test Point TP1020 6–41. . . . . . . . . . . . . . . . .
Figure 6–63: Power Supply Test Point TP2030 6–41. . . . . . . . . . . . . . . . .
Figure 6–64: Location of Main Board in Instrument 6–42. . . . . . . . . . . . . .
Figure 6–65: Main Board Probe Points 6–42. . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–66: Waveform on Display 6–43. . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–67: Battery Connections to Power Supply Board 6–44. . . . . . . . .
Figure 6–68: CR2012 on Power Supply Board 6–44. . . . . . . . . . . . . . . . . .
Figure 6–69: Display Showing Power is Battery 6–45. . . . . . . . . . . . . . . . .
Figure 6–70: Display Showing Battery Voltage is Low 6–45. . . . . . . . . . . .
Figure 6–71: R2012 on Power Supply Board 6–46. . . . . . . . . . . . . . . . . . . .
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1503C MTDR Service Manual
Table of Contents
Figure 6–72: R1018 on Front Panel Board 6–47. . . . . . . . . . . . . . . . . . . . . .
Figure 6–73: LCD Pattern with Contrast Too Light 6–47. . . . . . . . . . . . . . .
Figure 6–74: LCD Pattern with Contrast Too Dark 6–47. . . . . . . . . . . . . . .
Figure 6–75: LCD Pattern Adjusted for Sharpness 6–48. . . . . . . . . . . . . . .
Figure 6–76: Waveform with Contrast Too Light 6–48. . . . . . . . . . . . . . . . .
Figure 6–77: Waveform with Contrast Adjusted Correctly 6–49. . . . . . . . .
Figure 6–78: Location of Pulser/Sampler Board in Instrument 6–50. . . . . .
Figure 6–79: TP1081 and TP1082 on Pulser/Sampler Board 6–50. . . . . . .
Figure 6–80: VR3020 and VR30212 on Pulser/Sampler Board 6–50. . . . . .
Figure 6–81: Service Diagnostic Menu 6–52. . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–82: Location of Pulser/Sampler Board in Instrument 6–52. . . . . .
Figure 6–83: Location of R1080 on Pulser/Sampler Board 6–53. . . . . . . . .
Figure 6–84: Service Diagnostic Efficiency Readout 6–53. . . . . . . . . . . . . .
Figure 6–85: Location of Pulser/Sampler Board in Instrument 6–54. . . . . .
Figure 6–86: Location of R2097 on Pulser/Sampler Board 6–55. . . . . . . . .
Figure 6–87: Over-Compensated 6–55. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–88: Under-Compensated 6–55. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–89: Correctly Compensated 6–56. . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–90: Location of Pulser/Sampler Board in Instrument 6–56. . . . . .
Figure 6–91: Location of C3010, TP3020, and TP3030 on
Pulser/Sampler Board 6–57. . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–92: Main Menu 6–57. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–93: L2010, R1011, and R1013 on Option 06 Board 6–58. . . . . . .
1503C MTDR Service Manual
Figure 7–1: Location of Voltage Selector, Fuse Holder on Rear Panel 7–2
Figure 7–2: Power Supply Module and P/O Rear Panel 7–4. . . . . . . . . .
Figure 7–3: Main Board 7–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 7–4: EPROM on Main Board 7–7. . . . . . . . . . . . . . . . . . . . . . . . .
Figure 7–5: Lithium Battery on Main Board 7–8. . . . . . . . . . . . . . . . . . .
Figure 7–6: Display Module/Front Panel Board Screw Locations 7–10. . .
Figure 7–7: Display Module/Front Panel Board Showing Hex Nuts 7–11.
Figure 7–8: Location of Default Jumper on Front Panel Board 7–12. . . . .
Figure 7–9: Default Jumper Positions 7–12. . . . . . . . . . . . . . . . . . . . . . . .
Figure 7–10: Main Board TP1041 7–13. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 7–11: Main Board TP3040 and Main Board TP3041 7–17. . . . . . . .
Figure 7–12: Main Board TP4040 and Main Board TP6010 7–17. . . . . . . .
Figure 7–13: Main Board TP7010 and Main Board TP9011 7–17. . . . . . . .
Figure 7–14: Main Board TP9041 and Front Panel CABLE
Connector 7–18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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Table of Contents
Figure 7–15: Installing the Case Cover Over the Chassis 7–20. . . . . . . . . .
Figure 9–1: Special Schematic Symbols 9–3. . . . . . . . . . . . . . . . . . . . . .
Figure 9–2: Component Locator – Main Board 9–15. . . . . . . . . . . . . . . . .
Schematics – Main Board 9–16. . . . . . . . . . . . . . . . . . . . . .
Figure 9–3: Component Locator – Front Panel Board 9–25. . . . . . . . . . . .
Schematics – Front Panel 9–26. . . . . . . . . . . . . . . . . . . . . .
Figure 9–4: Component Locator – Power Supply Board 9–28. . . . . . . . . .
Schematics – Power Supply 9–29. . . . . . . . . . . . . . . . . . . . . .
Figure 9–5: Component Locator – Pulser/Sampler Board 9–31. . . . . . . . .
Schematics – Pulser/Sampler 9–32. . . . . . . . . . . . . . . . . . .
Figure 9–6: Component Locator – EthernetBoard 9–34. . . . . . . . . . . . . . .
Schematics – Ethernet Board 9–35. . . . . . . . . . . . . . . . . . . . .
Figure 10–1: Cabinet 10–13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 10–2: Frame, Assemblies and Front Panel Controls 10–15. . . . . . . . .
Figure 10–3: Option 06 EthernetR 10–17. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 10–4: Power Supply 10–19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
x
1503C MTDR Service Manual
List of Tables
Table of Contents
Shipping Carton Test Strength xvii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fuse / Voltage Ratings 1–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Vp of Various Dielectric Types 1–11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Impedance of Various Cable Types 1–12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cable Length / Suggested Pulse / Suggested ft/div 1–14. . . . . . . . . . . . . . . . . .
Operator Performance Checks – Equipment Required 2–1. . . . . . . . . . . . . . .
Specifications: Electrical Characteristics 3–1. . . . . . . . . . . . . . . . . . . . . . . . .
Specifications: Environmental Characteristics 3–3. . . . . . . . . . . . . . . . . . . . .
Specifications: Physical Characteristics 3–4. . . . . . . . . . . . . . . . . . . . . . . . . .
Option 06 Ethernet: Electrical Characteristics 4–16. . . . . . . . . . . . . . . . . . . . .
Option Port Wiring Configuration 5–12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Row Driver Latch Bits 5–34. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Column Driver Latch Bits 5–36. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Controller Periods 5–37. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Option 06 Ethernet Control Lines 5–41. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Calibration Performance Check – Equipment Required 6–1. . . . . . . . . . . . . .
Pulse Widths with Allowable Tolerances 6–19. . . . . . . . . . . . . . . . . . . . . . . . .
Auto Pulse: Distance per Division and Pulse Width 6–20. . . . . . . . . . . . . . . . .
Option 06 EthernetR Checks – Equipment Required 6–31. . . . . . . . . . . . . . . .
Adjustment Procedures – Equipment Required 6–37. . . . . . . . . . . . . . . . . . . .
Main Board Voltages, Tolerances, Test Point Locations 6–40. . . . . . . . . . . . . .
Pulser/Sampler Voltages and Test Point Locations 6–51. . . . . . . . . . . . . . . . . .
Impedance Range and Specification 6–58. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maintenance – Equipment Required 7–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Cord Conductor Color Code 7–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Sealing Materials 7–18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1503C MTDR Service Manual
xi
Table of Contents
xii
1503C MTDR 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 this
product only as specified.
Only qualified personnel should perform service procedures.
To Avoid Fire or Personal Injury
Power Source
Use Proper Power Cord. Use only the power cord specified for this product and
certified for the country of use.
Use Proper Voltage Setting. Before applying power, ensure that the line selector is
in the proper position for the power source being used.
This product is intended to operate from a power source that will not apply more than
250 volts RMS between the supply conductors or between the supply conductor and
ground. A protective ground connection, by way of the grounding conductor in the
power cord, is essential for safe operation.
Ground the Product. This 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.
The standard power cord (161-0288-00) is rated for outdoor use. All other optional
power cords are rated for indoor use only.
Observe All Terminal Ratings. To avoid fire or shock hazard, observe all ratings
and markings on the product. Consult the product manual for further ratings
information before making connections to the product.
Do not apply a potential to any terminal, including the common terminal, that
exceeds the maximum rating of that terminal.
1503C MTDR Service Manual
Replace Batteries Properly. Replace batteries only with the proper type and rating
specified.
Recharge Batteries Properly. Recharge batteries for the recommended charge
cycle only.
Use Proper AC Adapter. Use only the AC adapter specified for this product.
Do Not Operate Without Covers. Do not operate this product with covers or panels
removed.
Use Proper Fuse. Use only the fuse type and rating specified for this product.
Avoid Exposed Circuitry. Do not touch exposed connections and components
when power is present.
xiii
General Safety Summary
Do Not Operate With Suspected Failures. If you suspect there is damage to this
product, have it inspected by qualified service personnel.
Do Not Operate in an Explosive Atmosphere.
Symbols and Terms
Terms 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.
Terms 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.
Symbols on the Product. The following symbols may appear on the product:
xiv
CAUTION
Refer to Manual
WARNING
High Voltage
Double
Insulated
Protective Ground
(Earth) Terminal
1503C MTDR 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
Disconnect Power
Use Care When Servicing
With Power On
Disposal of Batteries
Do not perform internal service or adjustments of this product unless another person
capable of rendering first aid and resuscitation is present.
T o avoid electric shock, disconnect the main power by means of the power cord or
the power switch.
Dangerous voltages or currents may exist in this product. Disconnect power, remove
battery, and disconnect test leads before removing protective panels, soldering, or
replacing components.
To avoid electric shock, do not touch exposed connections.
This instrument contains a lead-acid battery . Some states and/or local jurisdictions
might require special disposition/recycling of this type of material in accordance
with Hazardous Waste guidelines. Check your local and state regulations prior to
disposing of an old battery.
T ektronix Factory Service will accept 1503C batteries for recycling. If you choose
to return the battery to us for recycling, the battery cases must be intact, the battery
should be packed with the battery terminals insulated against possible short-circuits,
and should be packed in shock-absorbant material.
1503C MTDR Service Manual
Tektronix, Inc.
Attn: Service Department
P.O. Box 500
Beaverton, Oregon 97077 U.S.A.
For more information, call 1-800-833-9200.
xv
Service Safety Summary
xvi
1503C MTDR Service Manual
General Information
Product Description
Battery Operation
Options
The Tektronix 1503C Metallic-cable Time-Domain Reflectometer (MTDR) is a
cable test instrument that uses radar principles to determine the electrical
characteristics of metallic cables.
The 1503C generates a half-sine wave signal, applies it to the cable under test, and
detects and processes the reflected voltage waveform. These reflections are
displayed in the 1503C liquid crystal display (LCD), where distance measurements
may be made using a cursor technique. Impedance information may be obtained
through interpreting waveform amplitude.
The waveform may be temporarily stored within the 1503C and recalled or may be
printed using the optional dot matrix strip chart recorder, which installs into the
front-panel Option Port.
The 1503C may be operated from an AC power source or an internal lead-gel
battery, which supplies a minimum of eight hours operating time (see the
Specifications chapter for specifics).
Options available for the 1503C are explained in the Options and Accessories
chapter of this manual.
Standards, Documents,
and References Used
Changes and History
Information
1503C MTDR Service Manual
Terminology used in this manual is in accordance with industry practice.
Abbreviations are in accordance with ANSI Y1.1–19722, with exceptions and
additions explained in parentheses in the text. Graphic symbology is based on ANSI
Y32.2–1975. Logic symbology is based on ANSI Y32.14–1973 and manufacturer’s
data books or sheets. A copy of ANSI standards may be obtained from the Institute
of Electrical and Electronic Engineers, 345 47th Street, New York, NY 10017.
Changes that involve manual corrections and/or additional data will be incorporated
into the text and that page will show a revision date on the inside bottom edge.
History information is included in any diagrams in gray.
xvii
General Information
Installation and Repacking
Unpacking and InItial
Inspection
Power Source and Power
Requirements
Before unpacking the 1503C from its shipping container or carton, inspect for signs
of external damage. If the carton is damaged, notify the carrier. The shipping carton
contains the basic instrument and its standard accessories. Refer to the replaceable
parts list in the Service Manual for a complete listing.
If the contents of the shipping container are incomplete, if there is mechanical
damage or defect, or if the instrument does not meet operational check requirements,
contact your local T ektronix Field Office or representative. If the shipping container
is damaged, notify the carrier as well as Tektronix.
The instrument was inspected both mechanically and electrically before shipment.
It should be free if mechanical damage and meet or exceed all electrical
specifications. Procedures to check operational performance are in the Performance
Checks appendix. These checks should satisfy the requirements for most receiving
or incoming inspections.
The 1503C is intended to be operated from a power source that will not apply more
than 250 volts RMS between the supply conductors or between either supply
conductor and ground. A protective ground connection, by way of the grounding
conductor in the power cord, is essential for safe operation.
The AC power connector is a three-way polarized plug with the ground (earth) lead
connected directly to the instrument frame to provide electrical shock protection. If
the unit is connected to any other power source, the unit frame must be connected
to earth ground.
Repacking for Shipment
xviii
Power and voltage requirements are printed on the back panel. The 1503C can be
operated from either 115 VAC or 230 VAC nominal line voltage at 45 Hz to 440 Hz,
or a 12 VDC supply, or an internal battery.
Further information on the 1503C power requirements can be found in the Safety
Summary in this section and in the Operating Instructions chapter.
When the 1503C is to be shipped to a T ektronix Service Center for service or repair,
attach a tag showing the name and address of the owner, name of the individual at
your firm who may be contacted, the complete serial number of the instrument, and
a description of the service required. If the original packaging is unfit for use or is
not available, repackage the instrument as follows:
1. Obtain a carton of corrugated cardboard having inside dimensions that are at
least six inches greater than the equipment dimensions to allow for cushioning.
The test strength of the shipping carton should be 275 pounds (102.5 kg). Refer
to the following table for test strength requirements:
1503C MTDR Service Manual
General Information
SHIPPING CARTON TEST STRENGTH
Gross Weight (lb)
0 – 10 200
11 – 30 275
31 – 120 375
121 – 140 500
141 – 160 600
CAUTION. The battery should be removed fr om the instrument befor e shipping. If it
is necessary to ship the battery, it should be wrapped and secur ed separately befor e
being packed with the instrument.
2. Install the front cover on the 1503C and surround the instrument with
polyethylene sheeting to protect the finish.
Carton Test Strength (lb)
3. Cushion the instrument on all sides with packing material or urethane foam
between the carton and the sides of the instrument.
4. Seal with shipping tape or an industrial stapler.
If you have any questions, contact your local Tektronix Field Office or
representative.
1503C MTDR Service Manual
xix
General Information
Contacting Tektronix
Product
Support
Service
support
Toll-free
Number
Postal
Address
For questions about using Tektronix measurement products, call
toll free in North America:
1-800-833-9200
6:00 a.m. – 5:00 p.m. Pacific time
Or contact us by e-mail:
tm_app_supp@tek.com
For product support outside of North America, contact your local
Tektronix distributor or sales office.
T ektronix offers a range of services, including Extended Warranty
Repair and Calibration services. Contact your local Tektronix
distributor or sales office for details.
For a listing of worldwide service centers, visit our web site.
In North America:
1-800-833-9200
An operator can direct your call.
Tektronix, Inc.
Department or name (if known)
P.O. Box 500
Beaverton, OR 97077
USA
Web site www.tektronix.com
xx
1503C MTDR Service Manual
Operating Instructions
Overview
Handling
Powering the 1503C
The 1503C front panel is protected by a watertight cover, in which the standard
accessories are stored. Secure the front cover by snapping the side latches outward.
If the instrument is inadvertently left on, installing the front cover will turn off the
POWER switch automatically.
The carrying handle rotates 325° and serves as a stand when positioned beneath the
instrument.
The 1503C can be stored in temperatures ranging from –62° C to +85° C if a battery
is not installed. If a battery is installed and the storage temperature is below –35°
C or above +65° C, the battery pack should be removed and stored separately (see
1503C Service Manual for instructions on removing the battery). Battery storage
temperature should be between –35° C to +65° C.
In the field, the 1503C can be powered using the internal battery . For AC operation,
check the rear panel for proper voltage setting. The voltage selector can be seen
through the window of the protective cap. If the setting differs from the voltage
available, it can be easily changed. Simply remove the protective cap and select the
proper voltage using a screwdriver.
REMOVE
CAP TO
REPLACE
FUSE
Voltage
Selector
REMOVE
CAP TO
SELECT
VOLTAGE
1503C MTDR Service Manual
Line Fuse
AC Power
Cord Receptacle
Figure 1–1: Rear Panel Voltage Selector, Fuse, AC Receptacle
The 1503C is intended to be operated from a power source that will not apply more
than 250 V RMS between the supply conductors or between either supply conductor
1–1
Operating Instructions
and ground. A protective ground connection by way of the grounding conductor in
the power cord is essential for safe operation.
The AC power connector is a three-way polarized plug with the ground (earth) lead
connected to the instrument frame to provide electrical shock protection. If the unit
is connected to any other power source, the unit frame must be connected to an earth
ground. See Safety and Installation section.
CAUTION. If you change the voltage selector, you must change the line fuse to the
appropriate value as listed near the fuse holder and in the table below.
FUSE RATING VOLTAGE RATING
250 V NOMINAL RANGE
0.3 A T 115 VAC (90 – 132 VAC)
0.15 A T 230 VAC (180 – 250 VAC)
Care of the Battery Pack
Battery Charging
CAUTION. Read these instructions concerning the care of the battery pack. They
contain instructions that reflect on your safety and the performance of the
instrument.
The 1503C can be powered by a rechargeable lead-gel battery pack that is accessible
only by removing the case from the instrument. When AC power is applied, the
battery pack is charged at a rate that is dependent on the battery charge state.
The battery pack will operate the 1503C for a minimum of eight continuous hours
(including making 30 chart recordings) if the LCD backlight is turned off.
The battery pack will charge fully in 16 hours when the instrument is connected, via
the power cord, to an AC power source with the instrument turned off. The
instrument may be turned on and operated while the batteries are charging, but this
will increase the charging time. For longest battery life, a full charge is preferred
over a partial charge.
For maximum capacity , the batteries should be charged within a temperature range
of +20° C to +25° C. However, the batteries can be charged within a temperature
range of 0° C to +40° C and operated in temperatures ranging from –10° C to +55° C.
1–2
1503C MTDR Service Manual
Battery Removal
Operating Instructions
CAUTION. Do not charge battery pack below 0° C or above +40° C. Do not
discharge battery pack below –10° C or above +55° C. If r emoving the battery pack
during or after exposure to these extreme conditions, turn the instrument off and
remove the AC power cord.
The battery pack should be stored within a temperature range of –35° C to +65° C.
However, the self-discharge rate will increase as the temperature increases.
If the instrument is stored with the battery pack installed, the battery pack should
be charged every 90 days. A fully charged battery pack will lose about 12% of its
capacity in three to four months if stored between +20° C and +25° C.
NOTE. The battery pack in the 1503C is inside the instrument case with no external
access. Refer removal and replacement to qualified service personnel.
1. Ensure that the instrument power is off.
2. If the instrument is connected to an AC power source, remove the AC power
cable from the source and from the instrument.
3. If installed, remove the chart recorder, or other device, from the option port.
4. Loosen the four screws on the back of the case and set the instrument face-up
on a flat surface.
5. Swing the handle out of the way of the front panel.
6. Break the chassis seal by pushing downward with both hands on the handle
pivots on each side of the case.
7. Grasp the case with one hand and tilt the chassis out with the other. Lift by
grasping the outside perimeter of the front panel.
CAUTION. Do not lift the instrument by the front-panel controls. The controls will
be damaged if you do so.
8. Remove the top shield from the instrument by gently lifting the rear edge near
the sides of the instrument.
9. Unplug the battery cable positive lead at the battery.
1503C MTDR Service Manual
10. Unplug the battery cable negative lead at the battery.
11. Unplug the battery cable at the power supply.
1–3
Operating Instructions
12. Remove the cable.
13. Remove the two screws mounting the battery clamp to the chassis.
14. Carefully remove the clamp without touching the battery terminals.
15. Lift the battery out.
To re-install or replace the battery, repeat the above steps in reverse order.
Low Battery
If the battery is low, it will be indicated on the LCD (bat/low). If this is the case,
protective circuitry will shut down the 1503C within minutes. Either switch to AC
power or work very fast. If the instrument is equipped with a chart recorder, using
the recorder will further reduce the battery level, or the added load might shut down
the instrument.
bat/low 0.00 ft
O
N
O
F
F
O
F
F
O
F
F
50 W 2 ns
1 avg
0.00 dB 5000 ft
Low Battery
Indicator
Figure 1–2: Display Showing Low Battery Indication
Protection circuits in the charger prevent deep discharge of the batteries during
instrument operation. The circuits automatically shut down the instrument
whenever battery voltage falls below approximately 10 V. If shutdown occurs, the
batteries should be fully recharged before further use.
1–4
Low Temperature
Operation
NOTE. Turn the POWER switch off after instrument shutdown to prevent continued
discharge of the batteries.
When the instrument is stored at temperatures below –10° C, voids might develop
in the liquid crystal display (LCD). These voids should disappear if the instrument
is placed in an ambient temperature w +5° C for 24 hours.
When operating the 1503C in an environment below +10° C, a heater will activate.
The element is built into the LCD module and will heat the display to permit normal
operation. Depending on the surrounding temperature, it might take up to 15
minutes to completely warm the crystals in the LCD. Once warmed, the display will
operate normally.
1503C MTDR Service Manual
Preparing to Use the 1503C
Check the power requirements, remove the front cover, and you are ready to test
cables. The following pages explain the front-panel controls.
Operating Instructions
11
12
13
14
15
Tektronix
MENU
VIEW
INPUT
VIEW
STORE
VIEW
DIFF
STORE
INPUT PROTECTED
400 V PEAK MAX
CABLE
1 3 4 5 6 7
ac 0.00 ft
O
N
O
F
F
O
F
F
O
F
F
50 Ω
IMPEDANCE
1 avg
NOISE FILTER VERT SCALE DIST/DIV
HORZ
SET REF
VERT
2
1503C
0.00 db
METALLIC TDR
CABLE TESTER
1 ft
2 ns
.3
.4
POSITION
POSITION
PULSE WIDTH
Vp
.5
.6
.03
.7
.02
.8
.01
.9
.04
.05
.06
.07
.08
.09
.00
POWER
(PULL ON)
910
8
Figure 1–3: 1503C Front-Panel Controls
CAUTION. Do not connect to circuits or cables with live voltages gr eater than 400 V
peak. Voltages exceeding 400 V might damage the 1503C front-end circuits.
1503C MTDR Service Manual
1–5
Operating Instructions
Display
Power
Type Cursor Waveform
Front-Panel to Cursor
Distance Window
Front-Panel Controls
IMPEDANCE
View Input
Indicator
View Store
Indicator
View Difference
Indicator
Store
Indicator
ac
O
N
O
F
F
O
F
F
O
F
F
50 W 2 ns
Selected
Impedance
1 avg
Selected
Noise Filter
0.00 dB 5000 ft
Selected Selected Selected
Vertical Scale Distance per
Division
0.00 ft
Pulse Width
Figure 1–4: Display and Indicators
1. CABLE: A female BNC connector for attaching a cable to the 1503C for
testing.
2. IMPEDANCE: A four-position rotary switch that selects the output impedance
of the cable test signal. Available settings are 50, 75, 93, and 125 Ohms. The
selected value is displayed above the control on the LCD.
Grid
1–6
NOISE FILTER
VERT SCALE
DIST/DIV
3. NOISE FILTER: If the displayed waveform is noisy, the apparent noise can
be reduced by using noise averaging. A veraging settings are between 1 and 128.
The time for averaging is directly proportional to the averaging setting chosen.
A setting of 128 might take the instrument up to 35 seconds to acquire and
display a waveform. The first two positions on the NOISE FILTER control are
used for setting the vertical and horizontal reference points. The selected value
or function is displayed above the control on the LCD.
4. VERT SCALE: This control sets the vertical gain, displayed in dB, or the
vertical sensitivity, displayed in mr per division. Although the instrument
defaults to dB, you may choose the preferred mode from the Setup Menu. The
selected value is displayed above the control on the LCD.
5. DIST/DIV: Determines the number of feet (or meters) per division across the
display . The minimum setting is 1 ft/div (0.25 meters) and the maximum setting
is 5000 ft/div (1000 meters). The selected value is displayed above the control
on the LCD.
1503C MTDR Service Manual
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