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TM 9-4935-601-14-3&P
TECHNICAL MANUAL
OPERATOR, ORGANIZATIONAL,
AND
DS/GS MAINTENANCE MANUAL
(INCLUDING REPAIR PARTS)
FOR
TEKTRONIX
1502 TIME DOMAIN
REFLECTOMETER
(PATRIOT AIR DEFENSE GUIDED MISSILE SYSTEM)
HEADQUARTERS, DEPARTMENT OF THE ARMY
AUGUST 1986
TM 9-4935-601-14-3&P
WARNING
DANGEROUS VOLTAGE
is used to operate this equipment
DEATH ON CONTACT
may result if safety precautions are not observed.
Never work on electronic equipment unless there is someone nearby who is familiar with the operation and
hazards of the equipment and is able to give first aid. When the technician is aided by operators, he must warn
them about dangerous areas.
When possible, shut off power to equipment before beginning work on equipment. Ground every capacitor
likely to hold a dangerous potential. When working inside equipment, after the power has been turned off,
always ground every part before touching it.
Be careful not to contact high-voltage connections when installing or operating this equipment.
When possible, keep one hand away from equipment to reduce the hazard of current flowing through the vital
organs of the body.
Read FM 21-11, First Aid for Soldiers, and learn how to administer artificial respiration.
WARNING
Do not be misled by the term "low voltage."
Under adverse conditions, potentials as low
as 50 volts may cause death.
a/(b blank)
TM 9-4935-601-14-3&P
This material is reproduced through the courtesy of Tektronix Corporation.
Distribution is limited to use with the PATRIOT missile system.
TECHNICAL MANUAL ) HEADQUARTERS
) DEPARTMENT OF THE ARMY
No. 9-1430-601-14-3&P ) Washington, D.C., 26 August 1986
Operator, Organizational, and DS/GS Maintenance Manual
(INCLUDING REPAIR PARTS)
FOR
TEKTRONIX 1502 TIME DOMAIN REFLECTOMETER
(PATRIOT AIR DEFENSE GUIDED MISSILE SYSTEM)
REPORTING ERRORS AND RECOMMENDING IMPROVEMENTS
You can help improve this manual. If you find any mistakes, or if you find a way
to improve the procedures, please let us know. Mail your letter, DA Form 2028
(Recommended Changes to Publications and Blank Forms), or DA Form 2028-2
direct to: Commander, U.S. Army Missile Command, ATTN: AMSMI-LC-ME-
PM, Redstone Arsenal, Alabama 35898-5238. A reply will be furnished to you.
i
TM 9-4935-601-14-3&P
TABLE OF CONTENTS
Page
LIST OF ILLUSTRATIONS ........................................................................................................... iii
OPERATOR' SAFETY SUMMARY.............................................................................................
S iv
SERVICE SAFETY SUMMARY .................................................................................................... v
Section 0. GENERAL
0-1. Maintenance Forms and Records 0-1
0-2. Reporting Equipment Improvement Recommendations
(EIR) 0-1
0-3. Administrative Storage 0-1
0-4. Destruction of Army Material to Prevent Enemy Use 0-1
Section I. SPECIFICATION................................................................................................. 1-1
Section II. OPERATING INSTRUCTIONS............................................................................ 2-1
Section III. THEORY OF OPERATION ................................................................................. 3-1
Section IV. CALIBRATION PROCEDURE............................................................................. 4-1
Performance Check............................................................................................. 4-2
Calibration Procedure.......................................................................................... 4-6
Section V. MAINTENANCE .................................................................................................. 5-1
Section VI. OPTIONS............................................................................................................ 6-1
Section VII. REPLACEABLE ELECTRICAL PARTS ............................................................... 7-1
Section VIII. DIAGRAMS AND ILLUSTRATIONS .................................................................... 8-1
Section IX. REPLACEABLE MECHANICAL PARTS.............................................................. 9-1
Section X. SCHEMATICS, ACCESSORIES, AND FIGURES ............................................... 10-1
APPENDIX A MAINTENANCE ALLOCATION CHART.............................................................. A-1
ii
TM 9-4935-601-14-3&P
LIST OF ILLUSTRATIONS
Figure Figure
No. Page No. Page
1502 Time Domain Reflectometer vi 5-8 Front Panel, Identification of Parts for
2-1 1502 TDR with Cover 2-1 Assembly Steps 8 through 26 5-9
2-2 Battery Connector Polarity 2-2 5-9 Detail of Plug-in Compartment Seal 5-10
2-3 1502 Front Panel Controls 2-3 5-10 Detail of BNC Connector and Washer 5-10
2-4 Incident and Reflected Pulses 2-4 5-11 Detail of Pushbuttons and Their Shafts 5-10
2-5 CRT Display of Pulse 2-6 5-12 Detail of Subpanel Screwhole Sealing 5-11
2-6 TDR Display of R, versus Z 2-7 5-13 Detail of Fuseholder Installation 5-11
2-7 Impedance Nomogram 2-7 5-14 Detail of Fuseholder Caps 5-12
2-8 Open Cable 2-8 5-15 Application of Sealant to Battery Meter 5-12
2-9 Shorted Cable 2-8 5-16 Alignment of Battery Meter 5-12
2-10 Crimped Cable 2-9 5-17 Application of Sealant to FOCUS and
2-11 Frayed Cable 2-9 INTENSITY Controls 5-12
2-12 X-Y Output Module Strap 2-9 5-18 Application of Sealant to FINE Control
3-1 Simplified Block Diagram 3-1 Bushing 5-13
3-2 Sampling Diagram 3-2 5-19 Application of Sealant to FINE Control
3-3 Program Logic Cycle 3-3 Nut 5-13
3-4 Tunnel Diode Voltage-Current Curve 3-5 5-20 Installation of Distance Meter 5-13
3-5 Functional Block Diagram of Slow Ramp 5-21 Application of Sealant to ZERO
Generator 3-7 REFERENCE Control Bushing 5-14
3-6 Block Diagram of 1502 Power Supply 3-10 5-22 Application of Sealant to ZERO
3-7 Chart Recorder Logic 3-12 REFERENCE Control Nut 5-14
3-8 X-Y Output Module Strap 3-13 5-23 Application of Sealant to RECORD
4-1 Pulse Display 4-2 Toggle-switch Bushing 5-14
4-2 Jitter Check 4-4 5-24 Application of Sealant to RECORD
4-3 Aberration Check 4-4 Toggle-switch Nut 5-15
4-4 Fall Time 4-5 5-25 Installation of Rubber Cap-seal on
4-5 Power Supply Test Points and RECORD Toggle-switch 5-15
Adjustments 4-8 5-26 Application of Sealant to the GAIN or the
4-6 Main Board Test Points 4-9 0 dB DET Control Bushing 5-15
4-7 Pulse Generator Output 4-10 5-27 Detail Showing Lubrication and Sealing
4-8 Time Marks Aligned (Standard) 4-8 for the Variable Resistor 5-15
4-9 Time Marks Aligned (Metric) 4-13 5-28 Lubrication of the O-rings and Sealing for
4-10 Pulse Display 4-15 the Cam-switches 5-16
4-11 Loop Gain Adjustment 4-16 5-29 Installation of the POWER SWITCH 5-16
4-12 Reflected-fall Time Check 4-16 5-30 Lubrication of POSITION Control Knobs 5-17
4-13 Vertical Amp/Slow Ramp Board 4-17 5-31 Installation of Knob on Shaft 5-17
4-14 X-Y Output Module Connection Link 4-17 5-32 Lubrication of ZERO REFERENCE Knob 5-17
5-1 DC Fuse Location 5-3 5-33 Installation of Knob on ZERO
5-2 Transistor and Integrated Circuit Lead REFERENCE Control 5-17
Configuration 5-4 5-34 Lubrication of FOCUS and INTENSITY
5-3 Rear View of the HV Board 5-5 Control Knobs 5-18
5-4 230 Vac Transformer Wiring 5-6 5-35 Sealing of Battery Pack Screwholes 5-18
5-5 Subpanel, Identification of Parts 5-7 5-36 Application of Dielectric Type Compound 5-18
5-6 Rubber Seals, Edge Sealing for Subpanel 5-8 5-37 Detail of Front Panel Jacks 5-19
5-7 Detail of Implosion Shield Sealing 5-8 5-38 Detail of X-Y Module Thumbscrews 5-19
5-39 Sealing of Latch Assembly Screwholes 5-20
iii
TM 9-4935-601-14-3&P
OPERATORS SAFETY SUMMARY
The general safety information in this part of the summary is for both operating and servicing personnel.
Specific warnings and cautions will be found throughout the manual where they apply, but may not appear in
this summary.
TERMS
In This Manual
CAUTION statements identify conditions or practices that could result in damage to the equipment or other
property.
WARNING statements identify conditions or practices that could result in personal injury or loss of life.
As Marked on Equipment
CAUTION indicates a personal injury hazard not immediately accessible as one reads the marking, or a hazard
to property including the equipment itself.
DANGER indicates a personal injury hazard immediately accessible as one reads the marking.
SYMBOLS
In This Manual
This symbol indicates where applicable cautionary or other information is to be found.
As Marked on Equipment
DANGER - High voltage.
Protective ground (earth) terminal.
ATTENTION - refer to manual.
Power Source
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 either supply conductor and ground. A protective ground connection by way
of the grounding conductor in the power cord is essential for safe operation.
Grounding the Product
This product is grounded through the grounding conductor of the power cord. To avoid electrical shock, plug
the power cord into a properly wired receptacle before connecting to the product input or output terminals. A
protective ground connection by way of the grounding conductor in the power cord is essential for safe
operation.
Danger Arising From Loss of Ground
Upon loss of the protective-ground connection, all accessible conductive parts (including knobs and controls
that may appear to be insulating) can render an electric shock.
Use the Proper Power Cord
Use only the power cord and connector specified for your product.
Use only a power cord that is in good condition.
Refer cord and connector changes to qualified service personnel.
Use the Proper Fuse
To avoid fire hazard, use only the fuse of correct type, voltage rating and current rating as specified in the parts
list for your product.
Refer fuse replacement to qualified service personnel.
Do Not Operate in Explosive Atmospheres
To avoid explosion, do not operate this product in an explosive atmosphere unless it has been specifically
certified for such operation.
Do Not Remove Covers or Panels
To avoid personal injury, do not remove the product covers or panels. Do not operate the product without the
covers and panels properly installed.
iv
TM 9-4935-601-14-3&P
SERVICE SAFETY SUMMARY
FOR QUALIFIED SERVICE PERSONNEL ONLY
Refer also to the preceding Operators Safety Summary.
Do Not Service Alone
Do not perform internal service or adjustment of this product unless another person capable of rendering first
aid and resuscitation is present.
Use Care When Servicing With Power On
Dangerous voltages exist at several points in this product. To avoid personal injury, do not touch exposed
connections and components while power is on.
Disconnect power before removing protective panels, soldering, or replacing components.
Power Source
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 either supply conductor and ground. A protective ground connection by way
of the grounding conductor in the power cord is essential for safe operation.
Power plug options.
@FEB 1980
v
TM 9-4935-601-14-3&P
1792-01
1502 Time Domain Reflectometer.
REV A FEB 1980
vi
TM 9-4935-601-14-3&P
SECTION 0.
GENERAL
0-1. MAINTENANCE FORMS AND RECORDS
Department of the Army forms and procedures used for equipment maintenance will be those prescribed by TM
38-750, The Army Maintenance Management System (TAMMS).
0-2. REPORTING EQUIPMENT IMPROVEMENT RECOMMENDATIONS (EIR)
If your PATRIOT system needs improvement, let us know. Send us an EIR. You, the user, are the only one
who can tell us what you do not like about your equipment. Let us know why you do not like the design. EIRs
will be prepared using SF 368, Quality Deficiency Report (QDR). Mail the QDRs to Commander, U.S. Army
Missile Command, ATTN: AMSMI-LC-ME-PMH, Redstone Arsenal, AL 35898-5238. A reply will be furnished to
you.
0-3. ADMINISTRATIVE STORAGE
To prepare this unit for placement into and removal from administrative storage, refer to section 3, chapter 4,
of AR 750-1, Maintenance Equipment and Supplies. Temporary storage should be accomplished in
accordance with TB 750-25-1, section 2, Maintenance of Supplies and Equipment.
0-4. DESTRUCTION OF ARMY MATERIAL TO PREVENT ENEMY USE
For procedures for destruction of Army material to prevent enemy use, see section XI of TM 9-4935-393-14-1.
0-1(0-2 blank)
TM 9-4935-601-14-3&P
SPECIFICATION
General Information
The Tektronix 1502 is a portable Time Domain Reflectometer that uses pulses to test cables and provides a
visual display of cable faults. The test pulses are transmitted via the CABLE output jack. Reflections are
received at the same jack and displayed on the Cathode-Ray Tube (crt).
NOTE
All distances are shown in feet followed by metres in parenthesis. Metric units
are not direct conversions from the measurements shown in feet, but represent
the calibrated ranges of the metric option 1502.
Calibrated distance controls allow an operator to examine up to 100 feet (25 metres) of cable with segments as
small as 1 foot (25 cm) displayed horizontally across the 10-division crt screen. Low-loss cables as long as
2000 feet (500 metres) may be examined at 100 feet (25 metres) per division or 200 feet (50 metres) per
division. The horizontal crt scale is calibrated directly in distance units from 0.1 foot (2.5 cm) per division to
200 feet (50 metres) per division in a 1-2-5 sequence (1-2.5-5 sequence).
A 3-digit, direct reading dial indicates the distance to any cable discontinuity when the dial is used to
horizontally position the discontinuity's reflection to a crt reference line.
Vertical (Y-axis) deflection of the crt beam is proportional to the amplitude of the reflected signal plus the
incident step. The vertical scale is calibrated in units of rho (p) of the transmitted pulse amplitude. For a
definition of rho, refer to section 2 of this manual. The sensitivity scale can be selected in 7 calibrated steps
from 5 mp/div to 500 mp/div.
The transmitted pulse is a step-signal having an amplitude of approximately 225 mV. The risetime of the pulse
generator and the equivalent bandwidth of the deflection circuits provide a system reflected risetime of 140 ps
or less.
The 1502 plug-in compartment will accept either the X-Y OUTPUT MODULE or the TEKTRONIX Y-T Chart
Recorder. The X-Y OUTPUT MODULE is a standard accessory for the 1502 and provides an interface for an
X-Y recorder. The TEKTRONIX Y-T Chart Recorder is an optional accessory. This recorder uses a heated
stylus to record on 4 cm wide, heat-sensitive chart paper. The chart recording length represents the entire crt
screen and is controlled by the 1502.
The 1502 is a ruggedized portable instrument that can be used in the field as well as in the laboratory. The
requirements for a Type III, Class 3, Style A instrument as specified in MIL-T-28800 were used as a guideline
for the environmental specifications. The 1502 has a ruggedized case that provides protection when the
instrument is stored in exposed areas. When the instrument is not being used, the accessories, including the
Operators manual, may be packed in the instrument cover and latched tightly on the front of the instrument.
Table 1-1 indicates which accessories may be placed in the cover of the 1502.
The characteristics given in Table 1-2 apply over an ambient temperature range from -15◦ Jabse Service Manual Search 2024 ◦ Jabse Pravopis ◦ onTap.bg ◦ Other service manual resources online : Fixya ◦ eServiceinfo