Tektronix 1502 schematic

TM 9-6625-2801-14&P

TECHNICAL MANUAL

OPERATOR’S, ORGANIZATIONAL,

DIRECT SUPPORT, AND GENERAL SUPPORT

MAlNTENANCE MANUAL (INCLUDING MAINTENANCE REPAIR PARTS LIST)

FOR

TEST SET,

TEKTRONIX

NSN 6625-04-084-3855

TEKTRONIX, INC.

ELECTRICAL

TYPE 1502-1

HEADQUARTERS, DEPARTMENT OF THE ARMY

AUGUST 1981

WARNING

DRY CLEANING SOLVENT

Dry cleaning solvent or mineral spirits paint thinner is flammable
and should not be used near an open flame.
should be provided when these materials are used.

Fire extinguishers

Use only in

well-ventilated areas.

WARNING

Be extremely careful when working in the vicinity of batteries
when the battery case is open.

Do not use uninsulated tools.

Do not wear rings or watches. Metal articles will, if allowed
to contact connectors, cause severe arcing with possible injury
to personnel and damage to the battery.

TM 9-6625-2801-14&P

TECHNICAL MANUAL
NO. 9-6625-2801-14&P

DIRECT SUPPORT, AND GENERAL SUPPORT

MAINTENANCE MANUAL (INCLUDING MAINTENANCE REPAIR PARTS LIST)

You can help improve this manual. If you find any mistake
or if you know of a way to improve the procedures, please
let us know.
Changes to Publication and Blank Forms) , or DA Form
2028-2 located in the back of this manual direct to:
Commander, U.S. Army Armament Materiel Readiness
Command, ATTN:
A reply will be furnished to you.

HEADQUARTERS

DEPARTMENT OF THE ARMY

Washington, DC, 20 August 1981

OPERATOR’S , ORGANIZATIONAL,

FOR

TEST SET, ELECTRICAL

TEKTRONIX TYPE 1502-1*

REPORTING OF ERRORS

Mail your letter, DA Form 2028 (Recommended

DRSAR-MAS , Rock Island, IL 61299.

1

CHAPTER

Section

CHAPTER

Section

CHAPTER

Section

*NOTE

Throughout the text,

is in lieu of the authorized Federal nomenclature.

INTRODUCTION

General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

I.

II.

Description . . . . . . . . . . . . . . ....... . . . .

2

OPERATING INSTRUCTIONS

I.

Controls and Indicators . . . . . . . . . . . . . . . . . . .

Operation . . . . . . . . . . . . . . . . . . . . . .......

II.

3

SERVICE AND PREVENTIVE MAINTENANCE

I.

Service on Receipt of Material . . . . . . . . . . . . . . .

II. Repair Parts,

III.

Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . .

IV.

Preventive Maintenance . . . . . . . . . . . . . . . . .

this is referred to as a Time Domain Reflectometer or a TDR. This

Special Tools and Equipment . . . . . .

Paragraph

1-1
1-6

2-1
2-2

3-1
3-3
3-4
3-5

Page

1-1
1-1

2-1
2-3

3-1

3-1
3-1

3-1

i

TM 9-6625-2801-14&P

CHAPTER

Section

CHAPTER

Section

CHAPTER

Section

CHAPTER

Section

CHAPTER

Section

4
5

I.

II.

III.

6
I.

II.

7
I.

II.

8
I.

II.

9
I.

II.

III.

Paragraph

FUNCTIONAL ANALYSIS . . . . . . . . . . . . . . . . . . . . 4- 1

PERFORMANCE CHECKS/FAULT ISOLATION

General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1

Performance Checks . . . . . . . . . . . . . . . . . . . . . . . . 5-2

Fault Isolation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-5

MAINTENANCE INSTRUCTIONS

General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1

Maintenance Instructions . . . . . . . . . . . . . . . . . . . . 6-2

REPAIR INSTRUCTIONS

General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1

Repair of TDR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-3

FINAL INSPECTION

General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1

Final Inspection Checks. . . . . . . . . . . . . . . . . . . . . 8-2

PREPARATION FOR SHIPMENT AND STORAGE

Preparation for Travel.. . . . . . . . . . . . . . . . . . . . . 9-1

Shipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-2

Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-3

Page

4-1

5-1
5-1

5-11

6-1
6-1

7-1

7-1

8-1
8-1

9-1
9-1

9-1

APPENDIX

A

REFERENCES

B

MAINTENANCE ALLOCATION CHART (MAC)

C

MAINTENANCE REPAIR PARTS LIST

A-1
B-1
C-1

A-1

B-1

C-1

ii

LIST OF ILLUSTRATIONS

TM 9-6625-2801-14&P

Figure

1-1
2-1
2-2
2-3
2-4
2-5
2-6
2-7
2-8
2-9

2-10
2-11
2-12
4-1
4-2
5-1
5-2
5-3
5-4
5-5
5-6
5-7
5-8
5-9

5-10

7-1

C-1

C-2

Title

Time domain reflectometer, Tektronix 1502-1, cover removed. . . . . .

TDR front panel controls and indicators . . . . . . . . . . . . . . . . . . . . . .

Battery connector polarity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

230 Vac transformer wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Incident and reflecting pulses.. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

X-Y output module strap.... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Crt display of pulse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

TDR display of R

vs ZO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

L

Impedance nomograph . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Open able . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........

Shorted cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Crimped cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Frayed cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Simplified block diagram.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Simplified sampling diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Pulse display . . . . . . . . . . . . . . . . . . . . . . . . . . . ...... . . . . . . . . .

Jitter check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Position check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Rise time and fall time... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Power Supply board test points and adjustments . . . . . . . . . . . . . . .

Pulse display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Loop gain adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

PC board location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Vertical amplifier/slow ramp board . . . . . . . . . . . . . . . . . . . . . . . . . .

Output amplifier board fog adjustment . . . . . . . . . . . . . . . . . . . . . . . .

Power supply board DC fuse location . . . . . . . . . . . . . . . . . . . . . . . .

Replaceable electrical parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Standard accessories . . . . . . . . . . . . . . . .. . ..... .......

Page

1-0
2-1
2-4
2-4
2-5
2-6
2-8
2-9
2-9
2-10
2-10
2-10
2-11

4-1
4-2
5-2
5-3
5-4

5-4

5-6
5-7

5-8
5-9
5-9

5-10
7-1

C-4
C-5

Number

1-1
1-2
2-1
5-1
6-1
8-1
C-1

C-2

LIST OF TABLES

Title

Page

TDR accessories storage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. ...2-2

Tabulated data system... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...1-2

TDR front panel controls and indicators . . . . . . . . . . . . . . . . . . . . . . . 2-2

TDR troubleshooting procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . ...5-11

Maintenance effort . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...6-1

TDR final inspection checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...8-1

Replaceable electrical parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..C-3

Standard accessories . . . . . . . ............. ...... .. . . C-3

This technical manual is an authentication of the manufacturers’
commercial literature and does not conform with the format and
content specified in AR 310-3, Military Publications. This
technical manual does, however, contain available information
that is essential to the operation and maintenance of the
equipment.

iii/(iv blank)

TM 9-6625-2801-14&P

INSTRUCTIONS FOR REQUISITIONING PARTS

NOT IDENTIFIED BY NSN

When requisitioning parts not identified by National Stock Number, it

is mandatory that the following information be furnished the supply
officer.

1

- Manufacturer’s Federal Supply Code Number - 80009

2

- Manufacturer’s Part Number exactly as listed herein.

Nomenclature exactly as listed herein, including

3-

dimensions, if necessary.

4

- Manufacturer’s Model Number. Tektronix Type 1502-1

5-

Manufacturerfs Serial Number (End Item)

6

- Any other information such as Type, Frame Number, and
Electrical Characteristics, if applicable.

7

- If DD Form 1348 is used, fill in all blocks except 4, 5,

6, and Remarks field in accordance with AR 725-50.

Complete Form as Follows:

(a) In blocks 4, 5,

Supply Code Number - 80009, followed by a colon and

manufacturer’s Part Number for the repair part.

(b) Complete Remarks field as follows:

Noun:
For:

Manufacturer:

Model:

Serial: (of end item)

Any other pertinent information such as Frame

Number, Type, Dimensions, etc.

1502-1

and 6, list manufacturer's Federal

(nomenclature of repair part)

NSN:
Tektronix, Inc.
P.O. Box 500
Beaverton, Oregon 97005

6625-01-084-3855

v

TM 9-6625-2801-14&P

1-0

Figure 1-1. Time domain reflectometer, Tektronix1502-1, cover removed

CHAPTER 1

INTRODUCTION

TM 9-6625-2801-14&P

Section I.

1-1. Scope.

a. Purpose.

ual is to provide information and instruc­tion for the direct support maintenance
of the Time Domain Reflectometer, Tek-

tronix 1502.1 (hereafter referred to as

the TDR) including accessory equipment
and external test cable assemblies (see
figure 1-1),

b. Content Summary. This manual

contains the following information:

(1)

A description of the equipment.

Corrective and preventive main-

(2)

tenance

dures.

tions (appendix A).

instructions.

Checkout procedures.

(3)

(4)

Repair instructions.

(5)

Shipment and storage proce-

(6)

References to all related publica-

(7) Maintenance allocation chart

The purpose of this man-

GENERAL

defining maintenance level responsi­bilities (appendix B).

(8) Maintenance repair parts list

(appendix C).

1-2. Forms and Records. Refer to TM 38­750 for instructions on the use of
appropriate forms, records and reports.

1-3. Calibration.
for the TDR are provided in Technical
Bulletin TB 11-6625-2860-35.

1-4. Destruction of Material to Prevent
Enemy Use.
tion of materiel to prevent enemy use re­fer to TM 750-244-2.

1-5. Reporting Equipment Improvement
Recommendations (EIR). EIR’s will be
prepared using SF 368, Quality Deficiency
Report (QDR).
EIR’s are provided in TM 38-750, The
Army Maintenance Management System

(TAMMS).
to Commander, U.S. Army Armament Mat­eriel Readiness Command, Attention:
DRSAR-MAO, Rock Island, IL 61299. A
reply will be furnished directly to you.

For information on destruc-

EIR’s should be mailed directly

Calibration procedures

Instructions for preparing

Section II.

1-6. Description.

General.

a.
portable Time Domain Reflectometer which
uses radar principles 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).

The Tektronix 1502-1 is a

DESCRIPTION AND DATA

Calibrated distance controls allow an op­erator to examine up to 100 feet of cable
with segments as small as 1 foot displayed
horizontally across the 10-division crt
screen.
feet may be examined at 100 feet per divi­sion or 200 feet per division. The horizon­tal crt scale is calibrated directly in dis­tance units from 0. 1 foot per division to

200 feet per division in a 1-2-5 sequence.

Low-loss cables as long as 2000

1-1

TM 9-6625-2801-14&P

A 3-digit, direct reading dial indicates
the distance to any cable discontinuity
when the dial is used to horizontally posi–
tion the discontinuity’s reflection to a crt
reference line.

b. Description.

(1) Main case.

gedized portable instrument that can be
used in the field as well as in the labora–
tory.

Class 2, Style A instrument as specified
in MIL-T-28800 were used as a guideline

for the environmental specifications. The

TDR has a ruggedized case that provides

protection when the instrument is stored
in exposed areas.

is not being used, the accessories, including

the Operators manual, may be packed in

the front of the instrument. Table 1-1
indicates which accessories may be placed
in the cover of the TDR.

The requirements for a Type II,

(2) Accessories. When the instrument

The TDR is a rug-

1 TDR Slide Rule
1 TDR Application Note #1
1 X-Y Output Module
1 Instruction Manual 070-1792-00

1-7. Tabulated Data. The characteristics
given in table 1-2 apply after the instru­ment has been calibrated and will perform
to the requirements given in Chapter 5.

Termination
Pulse Amplitude

Into 50 Load

Accessories Not Stored in Cover

Accessory

Table 1-2.

Characteristics

Tabulated Data System

Tektronix part

number

003-0700-00
062-1538-00
016-0606-00

Performance

50 within ±2%.

225 mV Nominal.

Table 1-1.

Accessories Stored in Cover

Accessories

1 50 BNC Terminator
1 Precision 50 Cable

1 Viewing Hood
1 Operators Manual

1 BNC Connector

Female-to-Female

2 Replacement Fuses

(for front panel)

For 115 Vac
Operation

or

For 230 Vac

Operation (Option 6)
1 Power Cord
1 Filter, Mesh (crt)

TDR Accessories Storage

Tektronix parts

number

011-0123-00

012-0482-00
016-0297-00
070-1790-00

103-0028-00

159-0029-00

159-0054-00
161-0066-00
378-0055-00

Vertical System

Deflection Factor

(7 steps, 1-2-5

sequence)

Accuracy
Gain (screwdriver

control)

Displayed Noise

Low Noise Operation

Horizontal System

Distance Controls

5 /div to 500
/div.

Within ±3%.
At least 3.5:1

from calibrated
point.

±5 or less,
NOISE FILTER
switch “Out”.

±2 or less,
NOISE FILTER

switch “In”.

0 to 2000 feet

total.

1-2

TM 9-6625-2801-14&P

Table 1-2.

Tabulated Data
System - Continued

Horizontal System - Continued

Characteristics

Distance Dial

At X1 Multiplier

Range
Accuracy

I

At X1 Multiplier

Range
Accuracy

FEET/DIV Control

At X.1 Multiplier

Range
Scales

(8 steps,
1-2-5

sequence)

Accuracy

(All scale

settings)

(With scale
set at 20
ft/div)

At X1 Multiplier
Range

Scales

(8 steps,

1-2-5
sequence)

Accuracy

All scale
settings Within ±2%.

200 ft/div
scale

Dielectric Scales

SOLID PTFE Vp/V
SOLID POLY

Performance

0 to 100 feet.

Within ±2%, ±0.5
foot.

0 to 1000 feet.

Within ±2 %, ±1
Digit.

To 20 feet/div

0.1 foot/div to 20
feet/div.

Within ±2%.

Within ±1%

To 200 feet/div.

1 foot/div to 200

feet/div.

Within ±1%.

= 0.70

air

V

p/Vair

= 0.66

Characteristics

OTHER-VAR

Accuracy

Recorders

External Recorder
Interface for X-Y
Recorders

Horizontal

Vertical

Pen Lift

Mode 1

Source V

Sink

Mode 2 (inverted

Mode 1)

Source

Sink

Line Voltage

Battery Pack

(C size, 9 cell)

Operation

(+20oC to +25°C
charge and dis–
charge tempera­ture)

Full Charge Time

Performance

V

= 0.55 to 1

p/Vair

Within ±2%.

0.1 V/div;
(source impedance
10 K ).

0.09 to 0.13 V/div

adjustable (source)

impedance 10 k

= 5 V Nominal

s

with R
< 10 mA (V out

< 0.5 V).

Vs = 5 V Nominal

with R

< 0.5 mA (V out

<0.6V).
—

Power System

117 Vac ±20%, 48
to 410 Hz; fused
at 0.3 A.

234 Vac ±20%, 48

to 410 Hz; fused

at 0.15 A.

At least 5 hours.

16 hours

= 10 k

s

= 10 k

s

1-3

TM 9-6625-2801-14&P

Table 1-2.

Tabulated Data - Continued

Power System - Continued

Characteristics

Typical Charge
Capacity

Charge Tempera­ture

0oC

o

C to +25°C

+20

o

C

+40

Description

Discharge Tempera­ture

65% 100% 85%

40%

65% 55%

Physical Characteristics

Characteristics

Description

Weight with panel cover 18 pounds

and accessories
Without panel cover

16 pounds

and accessories
Height
Width with handle

Without handle
Depth including panel

5.0 inches

12.4 inches

11.8 inches

16.5 inches

cover
Handle extended

18.7 inches

1-4

CHAPTER 2

OPERATING INSTRUCTIONS

TM 9-6625-2801-14&P

Section I.

2-1.

tors.
pose of each front panel connector,
pushbutton,

Front Panel Controls and Indica-

A brief description of the pur-

control, and screwdriver

CONTROLS AND INDICATORS

adjustment follows.

controls of the plug-in module is also
included.
location.

Refer to figure 2-1 for their

A description of the

Legend for fig. 2-1:

1.

CABLE connector
FOCUS control

2.

3.

INTENSITY control

4.

POSITION control

5.

/DIV switch

6.

POWER switch

7.

GAIN adjustment

8.

NOISE FILTER switch

9.

BATTERY meter

10.

ZERO REF CHECK switch

Figure 2-1.

11.

ZERO REF SET control

12.

multiplier switch

13.

DISTANCE control

14.

FEET/DIV switch

15.

CABLE DIELECTRIC switches and
control

16.

RECORD/CAMERA switch

17.

AC LINE fuses

18.

X-Y OUTPUT MODULE

19.

External

TDR front panel controls and

chart recorder controls

indicators

2-1

TM 9-6625-2801-14&P

Table 2-1.

Figure 2-1

index no

1

2

3

4

5

6

7

8

TDR Front Panel Controls

and Indicators

Control or

indicator

CABLE

FOCUS

INTENSITY

POSITION/
FINE

/DIV

POWER

GAIN

NOISE
FILTER

Function

BNC Connector­delivers 110 ps
risetime pulse to
the test cable and
receives the re–
fleeted return
pulse.

Adjusts the focus
of the crt elec–
tron beam.

Controls the
brightness of crt
display.

Controls vertical
position of the crt
display. The
outer control is a
coarse adjust–
ment and the
inner control is
a fine adjustment.

Selects the verti­cal deflection
factor--5 /div
to 500 /div
(5-2-1 sequence).

Push-pull, off-on
switch (pull for
on) – does not
affect the battery

charging circuit.

Screwdriver ad-

just to set the

gain of the verti-

cal amplifier.

Reduces displayed
noise.

rate is reduced by

a factor of 10.

Display

Figure 2-1

index no.

9

10

11

12

13

Control or

indicator

BATTERY

ZERO

REF

CHECK

ZERO
REF
SET

MULTI-

PLIER

DISTANCE

Function

Meter to indicate

the relative charge

of the power pack.

Momentary contact
Pushbutton. When
pushed, checks

the horizontal lo­cation of the inci–
dent pulse on the
crt when the DIS­TANCE dial is
being used.

horizontal pulse
position control
for crt display.
Sets the incident

pulse edge to a

vertical reference

line of the crt

when the DIS-

TANCE dial is at

000 or the ZERO

REF CHECK but-

ton is pushed.

Two-position

switch (red con–

trol) for X.1 or

X1 multiplier.

Affects both the

DISTANCE dial

and the FEET/

DIV control.

Inicates the dis-

tance from the

TDR to the point

on the cable where

the display win-

dow begins. Two

ranges:
at X.1 or 1000
feet at X1. Dis-

abled when the

FEET/DIV is at

200 (FIND).

100 feet

2-2

TM 9-6625-2801-14&P

Table 2-1.

Figure 2-1

index no

14

15

16

TDR Front Panel Controls

and Indicators – Continued

Control or

indicator

FEET/DIV

CABLE
DIELEC­TRIC

SOLID
POLY

SOLID
PTFE

OTHER
VAR

RECORD/
CAMERA

Function

Selects the hori­zontal deflection
factor:

X1=1 - 200 ft/
div.

X.1=0.1 - 20
ft/div.

Three pushbuttons
and a screwdriver
adjust.
the proper velocity
of propagation.
VAR from 0.55 to

1.0 when the
OTHER pushbutton
is pressed. Fully
cw if for air die–
lectric.
trol has reference
marks every 30°
to indicate rela­tive propagation
constants.

Two-position lever
switch; pushed up
and then released,
it initiates X-Y
Recorder or a

Selects

VAR con-

Figure 2-1

index no.

17

18

19

Control or

indicator

AC LINE
FUSES

X-Y
OUTPUT
MODULE

X, Y,
and PEN
LIFT

Function

Chart Recorder;
pushed down, it
floods the crt ­during retrace to
display graticule
for photography.

Protection fuses
for line power
and battery charg­ing circuits (0.3
A fuses for 115
Vac; 0.15 A fuses
for 230 Vac).

The standard plug­in module for the
TDR. Used to
drive an external
X-Y Chart Re­corder.

Six front panel
jacks used for

driving an ex-

ternal X-Y re­corder.
are for horizon­tal drive.
are for vertical

drive.

jacks are for pen

control.

X jacks

Y jacks

PEN LIFT

Section II.

Be extremely careful when working
in the vicinity of batteries when the
battery ease is open. Do not use
uninsulated tools. Do not wear
rings or watches. Metal articles will,
if allowed to contact connectors,
cause severe arcing with possible
injury to personnel and damage to
the battery.

OPERATION

2-2. Operating Power Selection.

When substituting a dc power

supply or external battery for
the battery pack, be sure the
polarity is correct (see figure

2-2).

2-3

TM 9-6625-2801-14&P

Figure 2-2. Battery connector polarity

a.

Battery Connections. A 12 Vdc
power supply may be substituted for the
TDR battery pack by removing the pack
from the unit and connecting the power

supply to the terminals inside the battery

pack compartment.

The power pack can be stored at any
temperature between -40oC and +50°C
with the battery cells either fully or
partially charged.
rate of the cell increases with increased
temperature.
will lose about 50% of its charge in 3 to 4
months if stored at +20°C to +25°C.
Therefore, the battery pack should be

completely recharged before using if it
has been stored without power supplied

to its charging circuit for more than a
month.

A fully charged battery

The self-discharge

2-3. Turn-on Procedures.

If crt displays no signal, check
fault isolation paragraph 5-6.

Figure 2-3.

Preparation.

a.

NOTE

230 Vac transformer wiring

When the TDR is wired for 230
Vac, be sure that the two front
panel fuses are changed to 230 V,

0.15A slow-blow fuses and the
proper plug is installed on the
ac cable.

b.

230 Volt Operation. The battery

charger is factory wired for 115 Vac or

230 Vac if Option 6 is ordered. The
standard 115 Vac unit can be changed to
230 Vac operation by rewiring the line
transformer.
per wiring configuration for 230 V opera­tion.

Figure 2-3 shows the pro-

2-4

(1) To gain access to the front panel,

pull the two side latches forward and re-

move cover.
TDR as a stand, position it to raise the
unit to a convenient operating position

(figure 1-1).

(2) The battery pack is fully charged

in 16 hours when connected to an ac power

source and the unit is switched off. The

TDR may be operated while the battery

pack is charging; however, the charging

time will increase.

overcharge if the charger is left on long-

er than 16 hours.

may remain connected to an ac source
without damaging the batteries. Approxi-

mately once a month or every 15 -charge–
discharge cycles, the batteries should be
charged for approximately 24 hours.

Using the handle of the

The batteries will not

Therefore, the TDR

Approximately 30 minutes of operating
time can be expected from a 1-hour partial
charge. To avoid reverse charging, the
full 16 hour charge should be completed
in preference to a partial charge when­ever possible.

Control Settings (TDR).

b.

(1) Set front panel controls as

follows:

TM 9-6625-2801-14&P

FOCUS

INTENSITY

ZERO REF
POSITION
/DIV

DISTANCE
FEET/DIV

X1-x1
CABLE DIE-

LECTRIC

POWER

(2) Adjust INTENSITY and FOCUS

controls for a clear bright trace.

(3) Adjust POSITION controls to set

trace 2 divisions below horizontal center–

line.

(4) Attach precision 50 cable (012-

0482-00) to CABLE connector (stored in

cover).

(5) Turn ZERO REF SET button ccw
until incident pulse edge is located on a
vertical reference line. The incident
pulse edge is the initial rise of the step
pulse. The vertical reference line may be
any line you choose from center line to
left side of crt graticule. An arrow in
the second vertical line indicates a
commonly used reference line.

The reflected pulse from the open

end of the 50 cable should ap-

pear three horizontal divisions to
right of reference line. Open end
of cable is indicated by start of a

second rise in trace (see figure

2-4).

Midrange
Full range
Fully cw
Midrange

500
000

1
X1
SOLID POLY

ON

NOTE

Figure 2-4. Incident and reflected pulses

(6) Turn ZERO REF SET button
throughout its range to see that the inci–
dent pulse edge can be set on any verti­cal graticule line.
edge on vertical reference line.

(7) Set DISTANCE dial to 050 and
check that top of step (open cable re–
flection) is displayed.

(8) Press ZERO REF CHECK button
and check that incident pulse edge re­turns to vertical reference line of grati­cule.

POSITION controls so top of incident
pulse is on horizontal centerline.

and check for a reduction in displayed
noise as well as a reduction in scan rate.
Reset /DIV to 500, and release (by
depressing a second time) NOISE FILTER
button.

Note crt display; entire crt should be
flooded on retrace to illuminate graticule
when taking photographs. Release
CAMERA switch.

Reset DISTANCE dial to 000.

(9) Change /DIV to 50 and adjust

(10) Press NOISE FILTER pushbutton

(11) Press and hold CAMERA switch.

Set incident pulse

2-5

TM 9-6625-2801-14&P

(12) Lift up and hold RECORD switch.
Check that bright spot appears at left
edge of crt.

(13) Release RECORD switch. Slow

scan of spot will trace displayed wave­form.
automatically return to its normal mode
of scanning.

When scan is complete TDR will

c.

Control Settings (Accessories).

NOTE

The X-Y OUTPUT MODULE is
wired for either a positive or

negative pen lift signal. Be-

fore using the X-Y OUTPUT
MODULE , be sure that the pen
lift circuit on the etched cir­cuit board is properly connected.
Figure 2-5 shows the proper
connection for either a positive
or negative pen lift signal.

(4) To position stylus at desired
position on paper, adjust STYLUS POSI­TION screw while RECORD/CAMERA

switch is in the RECORD position.

(5) Release RECORD/CAMERA to
precede with recording. Chart record
circuits automatically shut off when re­cording is completed.

NOTE

In evaluating a graph, the dis-

tance between two dark hori-

zontal lines corresponds to one
vertical division of the crt dis–
play with respect to the
DIV setting; the distance be­tween two dark vertical lines
corresponds to one horizontal
division of the crt display with
respect to the FEET/DIV setting.

d. Use of Accessories.

Figure 2-5.

(1) If not already in place, install
X-Y OUTPUT MODULE into its compart­ment on front panel of TDR.

(2) Connect X, Y, and PEN LIFT
inputs of recorder to corresponding
jacks of X-Y OUTPUT MODULE.

(3) Position and hold RECORD/
CAMERA switch to RECORD to prepare
for recording.

X-Y output module strap

(1) Mesh Filter for the crt. A mesh
filter is provided with the TDR which
makes viewing of the crt easier when the

unit is being used in the sunlight. This

filter is placed over the crt by sliding it
onto the slots of the crt bezel.

provides shading for the crt and can be
installed over the crt by sliding it down
over the crt bezel sides.
must be removed before the viewing hood
will connect to the crt bezel.

If a Camera Adapter (Tektronix Part
Number 016-0327-00) is attached to the
crt bezel of the TDR, a C–30A/31 cam–

era can be used to take photographs of
the crt display.

illumination, the RECORD/CAMERA

switch must be pushed down and held
while the photograph is being taken.
After the trace is completed the entire crt

is flooded to provide a light background

to allow the dark graticule to appear in
the photograph.

.

(2) Viewing Hood. The viewing hood

The mesh filter

(3) Using a Camera with the TDR.

To obtain graticule

2-6

TM 9-6625-2801-14&P

2-4.

the TDR to the BNC connector (CABLE)
on the front panel.

ter as required.

Cable Testing.

Do not connect live circuit cables
to the input of the TDR. Volt­ages in excess of 5 volts can dam­age the sampling gate or tunnel
diode.

Bleed cables before connecting
them to the TDR to remove static
charge from them. The 50 ohm

termination and BNC adapter
supplied may be used to bleed
any cable charge.

When testing antennas, be sure
that you are not close to trans-

mitters that can be keyed at the
antennas receiving frequency.
Keying of transmitters in close
proximity can cause damage to
the TDR.

Connecting a Cable for Testing.

a.

(1) Connect cables to be tested by

Use connector/adap-

150 feet long, set

and the multiplier

Use the X.1 multiplier whenever
possible to lessen the effects of
jitter.

(2) Measure the distance between

the incident pulse rise and the reflected

pulse rise.

The distance from the sampling

bridge to the CABLE connector

(2. 5 inches) should be taken in­to account when measuring
cables less than 2 feet in length.

(3) To more accurately locate the

discontinuity, set the FEET/DIV control
to a lower setting. (The reflected
pulse does not need to be in the display

window).
button and adjust the ZERO REF SET
control so that the incident pulse rise is

set at a convenient vertical reference

graticule line.
contol may have to be readjusted when

changing the FEET/DIV control.

Push the ZERO REF CHECK

the FEET/DIV to 200

at X.1.

NOTE

NOTE

The ZERO REF SET

(2) Adjust FOCUS and INTENSITY
controls for a sharp and bright display
on the crt.

b. Locating a Discontinuity in a Cable.

The DISTANCE dial and the FEET/DIV
control make it possible to evaluate cables
as long as 2000 feet. The entire length
can be displayed directly on the crt if
desired.
only that portion of the trace seen on the
crt will be recorded on the graph. To
check cables using the crt, proceed as
follows:

(1) Set crt display window so it is

longer than the cable under test by set-

ting the FEET/DIV control and the X1/
X.1 control,

If a chart recorder is used,

For example, if the cable is

NOTE

Always set the incident and re­flected pulse to the 10% points of
their amplitude (see figure 2-6).

(4) Turn the DISTANCE dial clock-

wise until the reflected pulse is located
on the reference graticule line. The
reading on the DISTANCE dial times the

multiplier gives the length from the
CABLE connector to the end of the cable

(or to the discontinuity).

NOTE

When checking cables longer
than 1000 feet, adjust the DIS­TANCE dial until the reflected
pulse reaches the right-hand

2-7

TM 9-6625-2801-14&P

edge of the graticule, then
add the graticule display dis­tance to that on the DISTANCE
dial for the total length. The
reading of the DISTANCE dial,
plus the number of divisions

(from the reference line) across
the graticule times the FEET/
DIV setting gives the total
length of the cable. Remember
that in the 200 FEET/DIV set­ting the DISTANCE dial is in­operative.

Figure 2-6. Crt display of pulse

(5) The CABLE DIELECTRIC push-

buttons allow the TDR to accurately lo­cate discontinuities in cables of various

relative propagation velocity constant

(Vp).
brated to check solid polyethylene die­lectrics which have a Vp of 0.66. The

SOLID PTFE button is calibrated to check

solid polytetrafluoroethylene (Teflon)
which has a Vp of 0.70. The OTHER
button is variable from 0.55 to 1.00 and
is controlled by the screwdriver adjust–

ment control VAR.
control is turned to the fully clockwise
position, it is calibrated for air dielectrics
which have a Vp of 1.00. If all three of
the CABLE DIELECTRIC buttons are

released, a default condition leaves the
instrument calibrated for air dielectrics

(Vp) = 1.00).

The SOLID POLY button is cali-

When this screwdriver

/DIV control determines the vertical
deflection that can be seen on the crt or
recorded on a graph if a chart recorder

is used.

measure the ratio of the reflected signal
amplitude to the incident signal amplitude
in rho ( ), which is called the voltage

reflection coefficient.

measurement of reflected signal amplitude

and can be used to determine the im–

pedance of a discontinuity. Note that no

reflection is obtained from a cable that
has no discontinuities if the cable is ter-

minated with its characteristic impedance.

If a cable has an open, i.e., a break

(infinite impedance), the reflected step

amplitude is +1 ;

short (zero impedance), the reflected

step amplitude is -1

of a TDR display labeled to identify the
incident and reflected voltage signals.

When =0, the transmission line is ter-

minated by a resistance equal to its

characteristic impedance (Z0) which, in

this case, is 50

the transmission line load is a short. If
the line is terminated by RL > 50
is positive and if the line is terminated by
RL < 50 is negative.

ting reflected pulse amplitude to impe-

dance.

teristic impedance, Z0, of the cable under

test and the load (or the impedance of

the discontinuity), R

Therefore, a can also be defined as:

the cable problems that can be analyzed

with the TDR include opens, shorts, pin-

holes in the cable shield, opens in the

shield, kinks in the cable, mismatched

connectors, and corroded connectors.

c.

Evaluating a Discontinuity. The

This control is calibrated to

Rho ( ) is the

and if a cable has a

(1) Figure 2-7 shows the two parts

.

When equals +1,

(2) Figure 2-8 is a chart for conver-

Rho is dependent on the charac-

, on the cable.

L

Typical Cable Problems. A few of

d.

2-8

TM 9-6625-2801-14&P

Figure 2-7.

TDR display of RL vs Z

O

Figure 2-8.

Impedance nomograph

2-9

TM 9-6625-2801-14&P

Figures 2-9 through 2-12 show typical
examples of these problems.

Figure 2-9. Open cable

e.

Checking Cables with Other than

50 Ohms Impedance.

(1) Cables with a characteristic

impedance other than 50 can be evalu-

ated by adjusting the GAIN control
(screwdriver adjust) to correct the re-

flected pulse for +1 at the open end of
a cable.

incident pulse will no longer be 1

dance other than 50 , either connect

an impedance–matching adapter (50 to

75 , 50 to 93 50 to 125 etc.) to the

CABLE connector and connect a short
length of cable (with impedance the same
as the adapter, i.e., 75 125 etc.)

to the adapter or connect the cable to be

tested to the CABLE connector. With the

/DIV control set at 500, position the

trace on the graticule so that the display

of the cable appears in the display. Now

When the GAIN is changed, the

.

(2) To reset the GAIN for an impe-

Figure 2-10.

Figure 2-11. Crimped cable

Shorted cable

2-10

TM 9-6625-2801-14&P

adjust the GAIN control so that the open
end display (reflected pulse) is set 2
divisions above the cable display (hori-

zontal centerline). This sets the re­flected pulse to +1 from the character­istic impedance.

NOTE

If an impedance adapter is not

used, secondary reflections

will re–appear as discontinu­ities beyond the open end of
the cable.

Figure 2-12.

Frayed cable

2-11/(2-12 blank)

CHAPTER 3

SERVICE AND PREVENTIVE MAINTENANCE

TM 9-6625-2801-14&P

Section I.

3-1. Unpacking and Inspection. When the TDR is
received, it will be packed in a corrugated card­board carton. Inside packing and re-enforcement is
also fabricated from corrugated cardboard. Gain
access to the TDR by carefully cutting the sealing
tape on top of the carton, open carton, remove the
top packing, and withdraw TDR from carton,

Carton should be stored for future use in reship­ping. Visually inspect the TDR for

Section II.

3–3. Repair Parts. Repair parts are

listed in Appendix C of this manual.

SERVICE UPON RECEIPT OF MATERIAL

damage.
panel and controls for damage. Open in­side cover. Remove, unwrap and check
for all items listed in table 1-1 and in­spect all items for damage.

3-2. Checkout Procedures. Perform
procedures given in paragraphs 2-3 a
and b to ensure the equipment is in op­erational condition.

REPAIR PARTS , SPECIAL TOOLS AND EQUIPMENT

Section III.

LUBRICATION

Release cover and inspect front

3-4. General. This equipment does not

require periodic lubrication.

Section IV.

Dry cleaning solvent or mineral
spirits paint thinner is flammable
and should not be used near an
open flame. Fire extinguishers
should be provided when these
materials are used.
ventilated areas.

Use only in well

PREVENTIVE MAINTENANCE

3-5. General.
consists of cleaning, visual inspection,
etc. Preventive maintenance performed

on a regular basis will help improve the

reliability of the instrument. The se-

verity of the environment to which the

TDR is subjected determines the fre-

quency of needed maintenance. A con­venient time to perform preventive
maintenance is preceding recalibration of
the instrument.

Preventive maintenance

3-1

TM 9-6625-2801-14&P

3-6. Cleaning.

a.

General. Accumulation of dirt in
the instrument can cause overheating and
component breakdown. Dirt on compo­nents acts as an insulting blanket and
prevents efficient heat dissipation. It
also provides an electrical conduction
path.

b.

Interior.
in a manner that protects the interior of
the instrument from dust.

When the cabinet is removed,
the watertight integrity may be
compromised.
tions (in this section) on remov­ing and replacing the cabinet.

Therefore, the interior of the TDR
should not require cleaning unless the
unit has been left with the front cover
removed and the plug–in compartment
empty.
terior is to blow off the accumulated dust
with low–pressure air.
that remains with a soft brush or a cloth
dampened with a mild detergent and
water solution.
cator is useful for cleaning in narrow

spaces on circuit boards.

The best way to clean the in-

The TDR is constructed

NOTE

See the instruc-

Remove any dirt

A cotton-tipped appli-

rinsed with clear water.
cumulated on the front panel is best
removed with a small brush or a soft
cloth dampened with a mild detergent and
water solution.
not be used on the front panel.

d.

CRT Implosion Shield. The face of
the crt can be cleaned by using isopropyl
alcohol applied and wiped very gently
dry with lens paper (NSN 6640-00-559-

1385).

3-7.
pack should be inspected every two
months.
be replaced if venting or corrosion has
occurred.

3-8. Water-tight Seals. The TDR is pre­pared to be operated in any weather
(rain, snow, dust, etc.). To prevent

moisture and dust from getting inside the
instrument, special seals are used around
the pushbuttons,
and rotary controls.
the components on the front panel will
require special resealing procedures to
retain their water–tight integrity.

3-9. Calibration.
measurements, check the calibration
every 120 days.
Procedure Technical Bulletin for Time

Domain Reflectometer, Tektronix Type

1502-1, TB 11-6625-2860-35 for calibra­tion procedures.

Servicing battery. The battery

The entire battery pack should

Abrasive cleaners should

crt, power switches,

To ensure accurate

Refer to Calibration

Loose dust ac-

Removal of any of

Avoid the use of chemical clean­ing agent which might damage

the plastics used in this instru­ment.
contain benzene, toluene, xy–
lene, acetone or similar solvents.

c.

can be washed with soap and water and

Avoid chemicals which

Exterior.

The cabinet exterior

3-2

CHAPTER 4

FUNCTIONAL ANALYSIS

TM 9-6625-2801-14&P

4-1.

TDR uses radar principles to check cable
conditions.
the pulses down the cable under test,

and the sampler circuits sample the echos
and provide the vertical signal for dis­play on the crt.

tunnel diode in a 50 ohm strip line (cavi­ty). It contains all biasing and timing
circuits required for operation of tunnel

diode CR1703.

Simplified Circuit Analysis. The

The pulser circuits transmit

Pulser. The pulser is basically a

a.

b.

Sampling.

(1) Sequential equivalent-time samp­ling is used to develop a display (see
figure 4-1).
a fast ramp and a slow ramp. The fast
ramp is compared to the slow ramp or a

fixed reference to generate trigger pul­ses for the sampler and the pulser respec­tively.
the pulser and sampler comparators.

These comparisons are made by

Two ramps are generated,

Figure 4-1.

Simplified block diagram

4-1

TM 9-6625-2801-14&P

(2) A short time after the pulser
transmits the step pulse into the cable
under test, depending on the amplitude
of the slow and fast ramps, a sampling
trigger from the sampler comparator
causes the sampler to sample–and–hold
the voltage level appearing at that time.
This voltage is taken at the point where
the sampler is connected to the 50 ohm
strip line.
fied and sent through the vertical ampli­fiers to the crt.

(3) The slow ramp generator pro-

vides the horizontal sweep for the crt
and, combined with the vertical sample,

This voltage sample is ampli-

provides a display of the sampled value.
Ensuing sampling triggers taken later
during the next fast ramp time, cause

additional samples to be displayed next to

the first one, until a line of very short

dashes is formed across the crt, appear­ing as a solid line (figure 4-2).

c.

Chart Recorder.

(1) The amplified vertical and ramp
signals are also sent to X–Y interface
connectors. These signals, along with a
pen lift control signal, provide the in­formation for driving external X-Y record-

ers.

4-2

Figure 4-2.

Simplified sampling diagram

CHAPTER 5

PERFORMANCE CHECKS/

FAULT ISOLATION

Section I. GENERAL

TM 9-6625-2801-14&P

5-1. Introduction.
detailed performance checks for the TDR.

Performance checks may be made without

5-2. Preparation for Performance Checks.

a.

Ensure that a battery is installed in

the TDR.

b. Connect TDR to ac power source.

c.

Pull the POWER switch to turn the
unit on.
the relative level of charge on the battery
pack. If the battery pack is fully charged

(charged for 16 hours), the BATTERY
meter needle will be approximately at the
top mark on the meter.

5– 3. Performance Checks.

a.

graph 5-2 and then set front panel con-

trols as follows:

INTENSITY
ZERO REF
POSITION Midrange
/DIV
DISTANCE
NOISE FILTER
FEET/DIV

MULTIPLIER X1

CABLE DIELECTRIC

b. Preset the POSITION and GAIN con-

trols so the trace is on screen and the

BATTERY meter will indicate

Perform procedures given in para-

SOLID POLY
SOLID PTFE
Other
VAR

This chapter provides

Section II.

Fully cw
Fully cw

500
000

Out

200

In
Out
Out
Fully cw

PERFORMANCE

any test equipment. Performing the
checks will also identify a fault present
in the

equipment.

CHECKS

amplitude is approximately 4 divisions.
Adjust the FOCUS and INTENSITY con­trols for a clear, bright trace.

FEET/DIV
MULTIPLIER
CABLE DIELECTRIC

SOLID POLY

SOLID PTFE
Other
VAR

b. Preset the POSITION and GAIN
controls so the trace is on screen and the
amplitude is approximately 4 divisions.

Adjust the FOCUS and INTENSITY con-

trols for a clear, bright trace.

c.

Adjust the GAIN control so that the

total amplitude of the display is exactly 4

divisions.
depot for repair.

d.
MULTIPLIER to X1.

e.
counterclockwise to locate the pulse at
center screen.

form as shown in figure 5-1a. If the

display is not correct, forward TDR to
depot for repair.

f. Connect the precision 50 terminator

(Tektronix Part No. 011-0123-00) to the
CABLE connector. Turn the GAIN control
fully counterclockwise and note the

If incorrect, forward TDR to

Set FEET/DIV control to 2 and

Turn the ZERO REF SET control

Check for correct wave-

200

X1

In
Out
Out
Fully cw

5-1

TM 9-6625-2801-14&P

amplitude of the pulse. Turn the GAIN
control fully clockwise. The amplitude
should be 4 times greater than the ampli-

Figure 5-1.

tude with the GAIN control fully counter­clockwise.
as necessary.)

Pulse display

(Adjust the POSITION control

g.

Set the /DIV control to 200, the
FEET/DIV control to 20 and the MULTI­PLIER control to X1.

h.

Adjust the ZERO REF SET control
so that the pulse is at the center of the
screen.
actly 5 divisions of amplitude.

i.
and remove the 50 terminator.
litude of the pulse must be 4 divisions

±0.12 division (±0.6 minor division). If

not, forward the TDR to depot for repair.

j.

adjust the ZERO REF SET control so the

leading edge of the incident pulse is set
on the vertical centerline.

k.
X1.

pulse must be within 1 division of the
vertical centerline. (If not, check the X1

Position calibration, para. 5-5k (5). If still
incorrect, forward TDR to depot for repair.

Adjust the GAIN control for ex-

Change the /DIV control to 500

The amp-

Set the FEET/DIV control to 1 and

Change the MULTIPLIER control to

The leading edge of the incident

l. Attach the 3 foot precision cable

(Tektronix Part No. 012-0482-00) to the
CABLE connector and change the FEET/
DIV control to 5.
SET control to locate the incident pulse on
the graticule reference line (as indicated
by the arrow on the graticlde line). The
reflected pulse should be 6.3 divisions to
the right of the incident pulse.

m.
reflected pulse is located on the graticule
reference line.
read 031.5 ± 1 digit.

n.
the incident pulse should return to the

graticule reference line. If the incident

Adjust the ZERO REF

Adjust the DISTANCE dial until the

The DISTANCE dial should

NOTE

When using the more sensitive ran­ges of the FEET/DIV control, the

0.3 foot between the CABLE connec­tor and the sampler must be taken
into consideration.

Push the ZERO REF CHECK button;

5-2

TM 9-6625-2801-14&P

pulse does not return to the graticule re-

ference line, adjust the ZERO REF SET
control so that the incident pulse is located

on the graticule reference line. Release

the ZERO REF CHECK control and check

that the reflected pulse is located on the

graticule reference line. Adjust the DIS­TANCE dial if necessary; it must remain

031.5±1 digit.

(If incorrect, forward TDR

to depot for repair). Return the DISTANCE

dial to 000 when this step is completed.

NOTE

To more accurately check the DIS­TANCE dial, a known length of solid

polyethylene (V

=0.66) cable (1000 to

p

1600 feet) should be used.

o.

Change the FEET/DIV control to 20,
the MULTIPLIER control to X1, and the
/DIV control to 200. Adjust the ZERO
REF SET control so that the reflected
pulse is located exactly on the eighth gra­ticule line from the left-hand edge of the

graticule.

of graticule).

The DISTANCE dial should
read between 167 and 173. Push in the
OTHER button (VAR control must be fully

C

w) and locate the reflected pulse on the

0 graticule line with the DISTANCE dial.

The DISTANCE dial should read between

240 and 250. (If incorrect, forward TDR
to depot for repair). Return the DIS­TANCE dial to 000 when this step is com­pleted.

s.

Change the FEET/DIV control to 1,
the MULTIPLIER control to X1, disconnect
the 3 foot cable from the CABLE connector,
and connect the precision 50 terminator
to the CABLE connector.

Adjust the ZERO

REF SET control to locate the pulse on the

graticule center.

Adjust the POSITION

control to center the pulse on the graticule.

Check that the jitter is not greater

t.

than 0.1 division (200 ps) (see figure 5-2),

Adjust the DISTANCE dial to locate

p.

the reflected pulse on each graticule line.
The DISTANCE dial should read as follows

(if incorrect, forward TDR to depot for

repair):

Graticule Line

8
7
6
5
4

3
2
1
0

Return the DISTANCE dial to 000,

q.

Distance Dial Reading

000

020±1 digit

040±1
060±1.2
080±1.6
100±2
120±2.4
140±2.8
160±3.2

change the MULTIPLIER control to X1 and
repeat the above step.

r.

Push the SOLID PTFE button (do
not readjust the ZERO REF SET control)
and adjust the DISTANCE dial so that the
reflected pulse is located on the 0 grati­cule line (first vertical line at left edge

Figure 5-2. Jitter check

Change the MULTIPLIER control to

u.
X1 and adjust the ZERO REF SET control
to locate the pulse on the graticule center.
Check that the jitter is not greater than

0.2 division (40 ps). If not, forward TDR

to depot for repair.

Change the /DIV control to 50,

v.

and turn the POSITION control counter­clockwise to display the top of the trace
on the graticule,

then adjust the ZERO

5-3

TM 9-6625-2801-14&P

REF SET control to locate the pulse on

the reference graticule line.

w.

Set the DISTANCE control to 500
and adjust the POSITION controls to cen–
ter the trace on the graticule, then return
the DISTANCE dial to 000.

x.

While viewing the trace, adjust the
DISTANCE dial from 000 to 100. The
trace must remain within ±1 division of the
centerline (±5% peak for the first 10 feet of

rise) (see figure 5-3).

set the DISTANCE dial to 500, re–center

the trace, then return the DISTANCE

dial to 100.

DISTANCE dial from 100 to 999.
trace must remain within ±1 division of
the centerline (0. 5% peak beyond 10 feet).

and push the NOISE FILTER button. While

viewing the trace,

dial from 100 to 999. The trace must re­main within ±0.4 division of the centerline

(0.2% peak beyond 10 feet with noise filter).
If there is a problem with aberrations or
noise,

return the DISTANCE dial to 000, and set
the /DIV control to 200.

entire incident pulse is displayed on the

crt and check that the rise time is less
than 0.55 division (100ps or 0.055 foot).

See figure 5-4 for definition of rise time.

Change the /DIV control to 5,

y.

z.

While viewing the trace, adjust the

The

aa.

Return the DISTANCE dial to 100

adjust the DISTANCE

forward TDR to depot for repair.

ab.

Release the NOISE FILTER button,

ac.

Adjust the POSITION control so the

Figure 5-3. Position check

Figure 5-4.

ad.

Remove the 50 terminator from

the CABLE connector and connect a

shorted terminator to the CABLE

Rise time and fall time

5-4

TM 9-6625-2801-14&P

connector.
so the entire reflected pulse is on the crt.
Check that the fall time is less than 0.7
division. Remove the shorted terminator
from the CABLE connector.

ae. Push the RECORD/CAMERA switch

to CAMERA and see that fogging oscilla-

tions fill the entire crt during retrace.

(If fogging does not occur, return to de-

pot.)

5-4. Detailed Performance Checks.

a.

Introduction.

the detailed procedure recommended for

verif

ying that a TDR performs according
to specifications.
DULE will be covered in this procedure.

b. Equipment Required. Digital multi-

meter, Fluke Model 8000A or equivalent.

This will be referred to as DM 8000A or

DM.

c.

Preliminary Connections and Set-Up.

(1) Remove the battery pack from the
rear of the TDR case. Remove the front
cover of the TDR.

Adjust the POSITION controls

This paragraph gives

The X-Y OUTPUT MO-

INTENSITY
ZERO REF SET
POSITION
/DIV
NOISE FILTER
GAIN
DISTANCE Dial
FEET/DIV

MULTIPLIER

FOCUS
CABLE DIELECTRIC
SOLID POLY
SOLID PTFE

Other
VAR

(6) Set the DM 8000A RANGE/FUNC-

TION control of the digital multimeter to

200 DC VOLTS.

the V- common INPUT terminals.

d. Power Supply Checks. Power supply
checks are not to be considered perform­ance checks.
points are shown in figure 5-5. See table
D-1 for location of board. Measure the

supply voltages with the digital multimeter
(Fluke 8000A).

Voltage Measurements.

e.

Connect the test leads to

The location of the test

Fully cw
Fully cw

Midrange

500
Out
Fully cw
000
200 (FIND)
X1
Adjust for a

clear trace

In
Out
Out
Fully cw

(2) Loosen the four screws at the
rear of the case and set the unit face up,
Push down on the handle to break the
seal;
surface.
case and pull free.

then place it face down on a flat

Take hold of the sides of the

(3) Remove the EMI shields from the
top and bottom of the unit. Place the
battery pack in the rear of the TDR,
taking care that the polarity is correct.
Connect the ac power cord to the ac
outlet, at the rear of the unit, and to a

115 Vac (230 Vac for Option 6) power

source.

(4) Pull the POWER switch to turn
the unit on and allow 20 minutes warm-up
before proceeding with checks.

(5) Preset the front panel controls

as follows:

(1)

Connect the lead from the common
terminal
the TDR

terminal

voltmeter reads +25 V (±0.25) V.

to TP6411 (violet test point).

switch to 20 Vdc.

voltmeter reads +10 V, ±0.1V.

to TP6227 (green test point) and check
that the voltmeter reads +5 V ±0.25V.

to TP 6332 (black test point) on

power supply board.

Connect the lead from the V-

(2)

to TP 6256 (red test point).

Adjust R6358 (HV ADJ) so the

(3)

(4) Move the test lead from TP6256

(5) Change the RANGE/FUNCTION

(6) Adjust R6514 (+10 ADJ) so the

(7) Move the test lead from TP6411

5-5

TM 9-6625-2801-14&P

Figure 5-5.

(8) Move the test lead from TP6227 to

TP6218 (orange test point) and check

that the voltmeter reads -5 V ±0.25 V.

(9) Change the RANGE/FUNCTION

switch to 200 Vdc.

(10) Move the test lead from TP6218
to connector P66 pin 6 (see figure 5-5)
and check that the voltmeter reads +100V;
tolerance +20 V, -5V.

(11) Move the test lead from P66 pin

6 to P66 pin 7 and check that the voltmeter

reads +165 V; tolerance +25 V, –5V.

f. CRT Check.

(1) Attach the precision cable to the

CABLE output.

(2) Check for a step pulse on the crt.

Power supply board test points and adjustments

Trance Focus and Astigmatism.

g.

(1) Set the FEET/DIV to 2 with the

MULTIPLIER control to X1.

(2) Locate the trace with the ZERO

REF SET at the center of the graticule.

(3) Set the front panel FOCUS con-

trol for the clearest possible trace.

(4) Remove the precision cable.

h. Trace Rotation.

(1) Set the /DIV

(2) Turn the ZERO
clockwise and adjust the
trols so that the trace is located on the
horizontal centerline.

control to 200.

REF SET fully

POSITION con-

5-6

TM 9-6625-2801-14&P

(3) Check that the trace aligns with

horizontal centerline. focus.

the

i.

Trace Geometry.

(1) Move the trace with the POSITION

controls so that it is located 3 divisions

below the horizontal centerline.

(2) Check that the trace aligns with

the graticule line (has no bow).

(3) Move the trace with the POSITION
controls so that it is located 3 divisions
above the horizontal centerline.

(4) Check that the trace aligns with

the graticule line (has no bow).

(5) Recheck the trace rotation and

Vertical Checks.

j.

(1) Pulse Strobe and Rise Time.

(a) Set the /DIV control to

500.

(b) Use the ZERO REF SET and

POSITION controls to locate the pulse

at the graticule center.

(c) Check that the incident and
reflected pulse both have equal ampli­tudes (see figure 5-6 for the correct

display).

Figure 5-6.

(2) Loop Gain.

(a) Set the FEET/DIV to 200, MUL-

TIPLIER to X1, and /DIV to 200.

(b) Connect the precision 500

terminator (Tektronix Part No. 011-0123-

00) to the CABLE connector.

(c) Use the ZERO REF SET control to
locate the pulse on the graticule. Use the
POSITION controls as necessary to locate

Pulse display

AR918079

the entire pulse step on the graticule.

(d) Adjust the front-panel GAIN

screw driver control for a pulse amplitude

of 5 divisions. (Adjust the POSITION
controls as necessary.)

(e) Check that the rise of the pulse

occurs within 0.1 division horizontally

and there is no spike at the top of the
pulse.
incorrect displays.

Figure 5-7 illustrates correct and

5-7

TM 9-6625-2801-14&P

(3) Noise.

(a) Set the /DIV to 5 and adjust
the POSITION controls so the top of the
trace is located on the horizontal center-

line.

(b) Check that the peak-to-peak

noise is not greater than 5 (1 division).

(c) Push the NOISE FILTER button
in and check that the peak–to–peak noise
is less than 2 (0.4 division).

(d) Change the FEET/DIV control
to 20.

(e) Use the POSITION controls to

set the bottom of the noise pulse at the

horizontal centerline.

(f) Check that the peak-to-peak
noise is less than 2

(g) Release the NOISE FILTER but­ton and check that the peak-to-peak noise
is less than 5

(4) DC Balance.

(a) Set the /DIV to 100.

(b) Use the POSITION controls to

locate the base of the pulse at the hori-

zontal centerline.

(c) Remove the 50 terminator and

check that the trace shift is less than 1/2

division.

(5) Vertical Attenuation.

the /DIV to 500, and turn the DIS-

TANCE dial completely clockwise.

switch to 2 on the DC VOLTS scale.

Replace 50 terminator.

(a) Remove the 50 terminator, set

(b) Set the DM RANGE/FUNCTION

Figure 5-7.

5-8

Loop gain adjustments

(c) Connect the lead from the DM

common terminal to the
of C2137 (on the VERT
board, figures 5-8 and

grounded terminal

AMP/SLOW RAMP

5-9).

TM 9-6625-2801-14&P

Figure 5-8.

PC board location

(d) Connect the lead from the V­terminal to the left end of R2229. See
figure 5-9 for the proper connection
points.

(e) Set the TDR POSITION controls
so that the DM reads 1.000 ±0.008 volt.

(f) Move the test lead from R2229
to R2326 (see figure 5-9). The DM
should read 0.400 ±0.008 volt.

(g) Move the test lead from R2326

to R2325 (see figure 5-9). The DM

should read 0.199 ±0.004 volt.

(h) Move the test lead from R2325

to R2323 (see figure 5-9). The DM

should read 0.991 ±0.002 volt.

(i) Move the test lead from R2323

to R2322 (see figure 5-9). The DM

should read 0.405 ±0.0008 volt.

Figure 5-9. Vertical amplifier/

slow ramp board

(j) Move the test lead from R2322

to R2321 (see figure 5-9). The DM

should read 0.200 ±0.0004 volt.

5-9

TM 9-6625-2801-14&P

(k) Move the test lead from R2321

to R2223 (see figure 5-9). The DM

should read 0.0100 ±0.0002 volt.

(l) Remove the test leads from the
TDR and turn the DISTANCE dial fully
counterclockwise.

k. Horizontal Checks.

(1) DISTANCE dial.

(a) Set controls as

/DIV
FEET/DIV 1

MULTIPLIER X1.

Attach the precision cable to the CABLE
output.

(b) Set the front panel DISTANCE

dial to exactly 031.5. Check that the leading
edge of the reflected pulse is located on the

graticule reference line within 0.1 division.

follows:

500

to locate the leading edge of the incident

pulse on the graticule reference line.

the reflected pulse is 6.3 divisions ±0.1

division away from the incident pulse.

MULTIPLIER control X1.

the TDR.

so that the leading edge of the incident

pulse is set on the vertical centerline.

the incident pulse is located within 1 divi-

sion of the vertical centerline when the

MULTIPLIER control is changed to X1.

(b) Use the ZERO REF SET control

(c) Check that the leading edge of

(3) X1 Positioning.

(a) Set the FEET/DIV to 1 with the

(b) Remove the 3-foot cable from

(c) Adjust the ZERO REF SET control

(d) Check that the leading edge of

(c) Push the ZERO REF CHECK
button; the incident pulse should return
to the graticule reference line. If this
check fails, adjust the ZERO REF SET
button, while holding the ZERO REF
CHECK button in, so the incident pulse

is located on the graticule reference line.

(2) X1 MULTIPLIER Control.

(a) Set the DISTANCE dial to 000

and FEET/DIV to 5.

l.

Fogging Circuit Adjustments.

(1) Push the CAMERA/RECORD

switch to CAMERA and see that bright

(fogging) oscillations appear across the

entire crt screen during retrace.

(2) Adjust the R3237 (FOG) located on

the OUTPUT AMPS board, (figures 5-8 and

5-10) while holding the CAMERA/RECORD

switch to CAMERA, until fogging vertically

covers the entire crt screen during retrace.

5-10

Figure 5-10.

Output amplifier board fog adjustment

TM 9-6625-2801-14&P

m.

X-Y Output Module Checks.

(1) Pen Lift Signal.

(a) Set the Digital Multimeter
RANGE/FUNCTION control to 20 on the
DC VOLTS scale.

(b) Turn the TDR upright.

(c) Place the terminal connection
link of the OUTPUT MODULE board on the

negative slope terminals (see figure 2-5).

(d) Connect the lead from the DM
V- terminal to the X-Y OUTPUT MODULE
PEN LIFT red terminal and the lead from
the DM common terminal to the X-Y OUT­PUT MODULE PEN LIFT black terminal.

(e) Check that the DM shows

approximately +5 volts.

(f) Momentarily push the RECORD/

CAMERA switch to RECORD, then release

the switch.
to +0.5 volt or less and returns to approx­imately +5 volts at the end of the sweep.

(g) Move the terminal connection

link to the positive slope terminals on the

X-Y OUTPUT MODULE board.

(h) Check that the DM reads ap-

proximately -0.5 volt.

Check that the voltage goes

(i) Push the RECORD/CAMERA

switch to RECORD and check that the DM

reads +4 volt or greater, then returns to

approximately 0.5 volt at the end of the
sweep.

(2) Y Output.

(a) Move the test leads from the
PEN LIFT terminals to the corresponding
Y terminals of the X-Y OUTPUT MODULE.

(b) Set the TDR ZERO REF SET
completely clockwise.

(c) Push the RECORD/CAMERA
switch to RECORD and adjust the TDR
POSITION controls so that the DM reads

0.0 volt.

(d) Turn the TDR ZERO REF SET
completely counterclockwise and check

that the DM reads approximately +0.04
volt .

terminals.

CAMERA switch to RECORD, then re–
lease.

from 0 to 1 V (100 mV/div) as the dot
moves across the screen.

Release the RECORD switch.

(e) Move the test leads to the X

(f) Momentarily press the RECORD/

(g) Check that the voltage reads

Section III.

5-5. Introduction.

be confined to power failure. A power

failure indication would be no display on
the crt or no indication on the battery
meter.

does not restore power, forward TDR to

depot for repair.

Para.

ref.

7-4b
2-3a

If the required corrective action

Trouble shooting will

Parts location drawings

Table 5-1.

No CRT display
No battery indication
Battery does not charge

TDR Troubleshooting Procedure

Symptom

FAULT ISOLATION

are referenced in the troubleshooting
tables as required. Replacement parts
are listed in Appendix C. Procedures
for parts replacement are given in Chap­ter 6.
paragraph 5-2 and perform troubleshooting

given in table 5-1.

Perform procedures given in

Corrective Action
Check fuses

Charge battery
Replace battery

5-11/(5-12 blank)

CHAPTER 6

MAINTENANCE INSTRUCTIONS

TM 9-6625-2801-14&P

Section I.

6-1. General.
direct support maintenance level person- (d) install; (e) replace the equipment.
nel.
level personnel are shown in the Mainten­ante Allocation Chart (MAC) in Appendix accordance with TB 11-6625-2860-35 for
B.

6-2. Maintenance Efforts. Table 6-1

lists the various maintenance efforts re-

quired, the frequency of performance,
and references to the actual procedures

to be performed.

The maintenance functions of the DS

The maintenance functions are to:

The TDR is maintained by

Section II.

MAINTENANCE INSTRUCTIONS

Table 6-1.

Maintenance effort

Frequency of performance

GENERAL

(a) inspect; (b) test; (c) service;

Calibration of the TDR is performed by
a separate calibration/repair facility in

the TDR.

Battery pack replacement. See

a.
figure C-1 for location. Loosen the two
thumbscrews and pull out the battery

pack.

secure the two thumbscrews.

Insert new battery pack and

Maintenance Efforts

Reference

Installation, replacement

Inspect and services:

Preventive mainte-

nance

Battery maintenance

Preparation for ship-

ment and storage

Tests

Repair

On receipt of equipment

As required

Every 30 days

As required

Every 30 days or

after repair and

service

As required

Para 3-1

Paras 3-6, 3-7

Para 3-7

Chapter 9

Para 5-3, 5-4

Chapter 7

6-1/(6-2 blank)

CHAPTER 7

REPAIR INSTRUCTIONS

TM 9-6625-2801-14&P

Section I.

7-1. Responsibilities. Repair at the di­rect support (DS) level consists of re­placing damaged or malfunctioning compo-

nents found during inspection and
checkout.
is performed only to the extent necessary
to accomplish the required repairs. Re­fer to the Maintenance Allocation Chart

(MAC) in appendix B

level of responsibility

7-3. General.

structions for removal and replacement
of assemblies and parts that need repair.
Refer to appendix C for location of parts.

7-4. Repair and Replacement Instructions.

Removal of major assemblies

to determine the

for maintenance

Section II.

This section contains in-

REPAIR OF TDR

GENERAL

functions. Items not identified in the
MAC, such as accessory equipment, may
be repaired by direct support mainte­nance personnel, if authorized by perti­nent directives.

7-2. Depot Repaired Components. Items

that cannot be repaired or disposed of

at DS should be sent to depot for repair

or disposition.

Refer to the MAC.

a. Fuses.

on the front panel. All dc fuses and

spares are located on the power supply
board inside the instrument. Remove

the TDR from its case (See paragraph

5-4c).

the top of the unit. The fuses are up-

right plug-in types located near the

center of the instrument (see figures

7-1 and C-1).

b.

ease on the TDR proceed as follows:

adapters from the cable connector.

Remove the aluminum shield from

When the cabinet is removed high
voltages may be present.

Replacing Case. To replace the

(1) Remove any termination and

All ac line fuses are located

Figure 7-1.

(2) Remove the battery pack and

power cord from the back of the TDR.

Power supply board DC fuse

location

7-1

TM 9-6625-2801-14&P

(3) Place the EMI shields on the top

and bottom of the TDR.

(4) Stand the TDR on its face.

(5) Slide the case over the back of

the unit, until it has reached the sub-

panel.

(6) Tighten the four screws on the
back of the case until the case is aligned
with the groove at the back of the sub–

panel.

(7) Make sure the case is in the
groove; then, using a torque screw­driver, tighten the four screws to 10

inch–pounds.

NOTE

If the screws are not tightened
equally to the required torque,
the watertight integrity of the
case can be destroyed.

(8) Place the battery pack in its

compartment and tighten the two screws

(finger tight is sufficient).

(9) Place the power cord and the

rest of the accessories in the front cover

storage compartment and latch it closed.

(10) Place the front cover over the

front cover panel and close the latches.

7-2

CHAPTER 8

FINAL INSPECTION

TM 9-6625-2801-14&P

Section I.

8-1. General.
condition of the TDR after repair or re–
placement, a final inspection must be
made.

8-2. Final Inspection Checks. Table 8-1

lists final inspection checks for the TDR

Assembly repaired
or replaced

Assembled TDR

(main case) and

all accessories.

The inspection is to be made

To ensure operational

Section II.

Table 8-1.

Assembly
reference
designation

FINAL INSPECTION CHECKS

TDR final inspection checks

a.
b. Check for completeness.
c.

Inspect for visible damage.

Perform turn-on procedures.

GENERAL

before the TDR is either returned to use

or placed in stock.

series of checks.

after it is repaired or replaced. Refer­ences are provided for each check.

Checks

The inspection is a

References

Paragraph 1-5 b.
Table 1-1.
Paragraph 2-3.

8-1/(8-2 blank)

CHAPTER 9

PREPARATION FOR SHIPMENT AND STORAGE

TM 9-6625-2801-14&P

Section I.

9-1. General.
plies to the TDR when contained in the
shelter.
quired, but the following general steps
should be taken:

No special preparation is re-

Preparation for travel ap-

PREPARATION FOR TRAVEL (IN SHELTER)

Section II.

9-2. Preparation of TDR.

Packing.

a.

(1) Place TDR in corrugated contain­ers in which it was shipped in accordance
with Federal Specification PPP-B–636,
style RSC (export), type CF, grade W5c,

class WR.

(2) At the corners of each container,

and to block the panel assembly above
and below, re-use built-up corrugated
blocking with double wall ac flute in ac­cordance with Federal Specification PPP–
F-320, type CR, grade DW200, class DOM.

a.

Place all accessory equipment and

group test cables in the TDR cover.

b.

Secure the cover in the closed

position with the two side clamps.

SHIPMENT

(3) Apply adhesive per MIL-A-101

to flaps of containers and close the flaps.

(4) Apply 2-inch waterproof tape in
accordance with Federal Specification
PPP-T-76 over all corners and open

seams.

(5) Mark container in accordance
with MIL–STD-129.

b.

Shipping Documents. Prepare
shipping documents to accompany all
freight in accordance with AR 725.50

Section III.

9-3. Preparation.

a.

Perform applicable checks listed in

table 8-1 to ensure operational readiness
of the equipment.

performed every 90 days while equipment
is in administrative storage.

b. Select a storage area or site that
best conforms to the following require­ments:

(1) Level storage surface.

These checks must be

STORAGE

(2) Maximum protection

weather and pilferage.

(3) Adequate drainage.

(4) Access to permit inspection,

maintenance, and removal from storage.

c.

Place equipment on blocks or dun-

nage to prevent contact with the ground

or a damp floor.

against

9-1

TM 9-6625-2801-14&P

d.

Mark or tag the equipment “admin-

istrative storage.”

operated while in the administrative stor–
age category except at the 90–day inter­vals when checkout is performed to en–
sure operation condition (refer to TM

740-90-1).

9-4.

least once each month.

stored outdoors, a visual inspection
should be made immediately following

hard rains, heavy snow storms, wind­storms, and other adverse conditions.

Inspection and Maintenance.

a.

Visually inspect the equipment at

Equipment will not be

For equipment

b. Disassemble or unpack equipment

only as necessary to determine the full

extent of deterioration or damage found
during visual inspection.

Perform preventive maintenance or

c.
repair immediately to correct any deterior–
ation or damage.

d. Record each inspection, condition
of the equipment at time of inspection,
and corrective action taken. Attach this

record to the equipment in such a manner

as to be protected from the elements.

9-2

APPENDIX A

REFERENCES

TM 9-6625-2801-14&P

A-1.

A-2.

A-3.

A-4.

A-5.

Administrative Aids

Index of Administrative Publications . . . . . . . . . . . . . . . DA Pam 310-1

The Army Maintenance Management System . . . . . . . . . . . . .

Related Maintenance Technical Manuals

Materials Used for Cleaning, Preserving, Abrading and Cementing Ordnance

Materiel and Related Materials Including Chemicals . . ..TM 9-247

Painting Instructions for Field Use . . . . . . . . . . . . . . . .

Related Commercial Maintenance Manuals

Tektronix 1502-1 Time Domain Reflectometer, Instruction Manual-070-

1792-00, September 1975

Related Calibration Manuals

Calibration Requirements for the Maintenance of Army

Materiel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Calibration Procedure for Time Domain Reflectometer

Tektronix Type 1502-l...... . . . . . . . . . . . . . . . . . . .

Other Related Publications

TM 38-750

TM 43-0139

TB 43-180

TB 11-6625-2860-35

Requisitioning, Receipt, and Issue System . . . . . . . . . .

Administrative Storage . . . . . . . . . . . . . . . . . . . . . . . . . .

Destruction to Prevent Enemy Use . . . . . . . . . . . . . . . . .

Marking for Shipment and Storage . . . . . . . . . . . . . . . . .

Tape, Pressure-Sensitive Adhesive Paper (for carton

sealing) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Tape, Pressure-Sensitive Adhesive, Masking, Paper. . .

Adhesive, Water Resistant . . . . . . . . . . . . . . . . . . . . . . .

Fiberboard; Corrugated and Solid, Sheet Stock

(Container Grade), and Cut Shapes

Plastic Film (Polyethylene Thin Gage) . . . . . . . . . . . . . .

Box, Fiberboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

AR 725-50
TM 740-90-1
TM 750-244-2

MIL-STD-129

PPP-T-76
UU-T-106
MMM-A-260
(Replaces MIL-A-101)

L-P-378
PPP-B-636

A-1/(A-2 blank)

APPENDIX B

MAINTENANCE ALLOCATION CHART

TM 9-6625-2801-14&P

Section I.

B-1. General.

a. The maintenance allocation chart

identifies the maintenance operations that

must be performed. It assigns each of
those operations to the lowest level of

maintenance authorized to perform the
complete task, or any part of the task,
in terms of availability of time, tools,
test and support equipment, skills and

employment of the subsystem.

b. The Maintenance Allocation Chart

(MAC) in section II designates overall
responsibility for the performance of
maintenance functions for the TDR.

c.

Section III lists the special tools
and test equipment required for each
maintenance function as referenced from

section II.

d. Section IV contains supplemental
instructions on explanatory notes for a
particular maintenance function.

B-2. Maintenance Functions.

a. Inspect. To determine the service­ability of an item by comparing its phys­ical, mechanical and/or electrical charac­teristics with established standards

through examination.

INTRODUCTION

replenish fuel, lubricants, hydraulic
fluids, or compressed air supplied.

d. Adjust.

scribed limits, by bringing into proper

or exact position, or by setting the opera-

ting characteristics to specified para­meters.

e.

Align. To adjust specified variable
elements of an item to bring about opti­mum or desired performance.

f. Calibrate.

corrections to be made or to be adjusted
on instruments or test measuring and
diagnostic equipments used in precision
measurement.

two instruments, one of which is a certi-

fied standard of known accuracy, to de-

tect and adjust any discrepancy in the ac-

curacy of the instrument being compared.

Install.

g.

ing or fixing into position an item, part,
or module (component or assembly) in a
manner to allow the proper functioning of
an equipment or system.

h. Replace.

serviceable like type part, subassembly,

or module (component or assembly) for an

unserviceable counterpart.

To maintain, within pre-

To determine and cause

Consists of comparisons of

The act of emplacing, seat-

The act of substituting a

b. Test.
detect incipient failure by measuring the
mechanical or electrical characteristics of
an item and comparing those characteris­tics with prescribed standards.

Service. Operations required

c.
periodically to keep an item in proper op­crating condition i.e., to clean (decon­taminate), preserve, drain, paint or

To verify serviceability and

Repair.

i.

nance services1 or other maintenance ac-

tions 2 to restore serviceability to an item

1

Services - inspect, test, service, adjust,

align, calibrate, or replace.

2

Action – welding, grinding, riveting,
straightening, facing, remachining, or
resurfacing.

The application of mainte-

B-1

TM 9-6625-2801-14&P

by correcting specific damage, fault, mal­function, or failure in a part, subassem­bly, module (component or assembly),
and item, or system.

j.

Overhaul.

(services/actions) necessary to restore
an item to a completely serviceable/opera­tional condition as prescribed by mainte­nance standards (i.e., DMWR) in appro­priate technical publication. Overhaul is
normally the highest degree of mainte­nance performed by the Army. Overhaul
does not normally return an item to like
new condition.

k. Rebuild.
vices/actions necessary for the restoration
of unserviceable equipment to a like new
conditions in accordance with original
manufacturing standards. Rebuild is the
highest degree of materiel maintenance
applied to Army equipment. The rebuild
operation includes the act of returning
to zero those age measurements (hours/
miles, etc.) considered in classifying
Army equipments/components.

B-3. Column Entries Used in the MAC.

a.

Column 1, Group Number. Column

1 lists group numbers, the purpose of
which is to identify components, assem–
blies, subassemblies, and modules with
the next higher assembly.

b.

Column 2, Component/Assembly.
Column 2 contains the names of compo­nents, assemblies, subassemblies, and
modules for which maintenance is author–
ized.

c.

Column 3, Maintenance Functions.
Column 3 lists the functions to be per­formed on the item listed in column 2.

(For detailed explanation of these
functions , see para. B-2).

d. Column 4, Maintenance Category.

(1) Column 4 specifies, by the listing

of a “work time” figure in the appropriate

sub-column(s), the lowest level of

The maintenance effort

Consists of those ser-

maintenance authorized to perform the
function listed in column 3. This figure
represents the active time required to
perform the maintenance function, at the
indicated level of maintenance.

(2) If the number or complexity of

the tasks within the listed maintenance
function vary at different maintenance

levels, appropriate
will be shown for each level. The num­ber of man-hours specified by the “work
time” figure represents the average time
required to restore an item (assembly,

subassembly, component, module, end
item, or system) to a serviceable condition
under typical field operating conditions.
This time includes preparation time,
troubleshooting time, and quality assur­ance/quality control time in addition to
the time required to perform the specific
tasks identified for the maintenance func­tions authorized in the maintenance al­location chart.

for the various maintenance levels are as

follows:

C - Operator or crew.
O - Organization maintenance.
F - Direct support maintenance.

H - General support maintenance.

D - Depot maintenance.

e.

Column 5, Tools and Equipment.

Column 5 specifies,

mon tool sets (not individual tools) and

special tools, test,

ment required to perform the designated

function.

f. Column 6, Remarks. Column 6
contains a letter code in alphabet order
which is keyed to the remarks contained

in section IV.

B-4. Column Entries Used in Tool and

Test Equipment Requirements (Section
III).

a.

Column 1, Tool or Test Equipment
Reference Code. The tool and test equip­ment reference code correlates with a

“work time” figures

The symbol designations

by code, those com-

and support equip-

B-2

TM 9-6625-2801-14&P

maintenance function on the identified
end item or component.

b. Column 2, Maintenance Category.

The lowest level of maintenance author-

ized to use the tool or test equipment.

c.

Column 3, Nomenclature. Name or

identification of the tool or test equip-

ment.

d. Column 4, National/NATO Stock

Number.

The National or NATO stock

number of tool or test equipment.

Section II.

MAINTENANCE ALLOCATION CHART FOR TIME DOMAIN

REFLECTOMETER TYPE 1502-1 (TDR)

(1)

GROUP

NUMBER

1

1

COMPONENT. ASSEMBLY

Tektronix Time

fh,ttery

(2)

Domain

fteflectometer Type

1502-%

MAINTENANcE

FUNCTION

Inspect

Test
Service

lnst.dl
Replace

e. Column 5, Tool Number. The manu-

facturer’s part number.

B-5. Explanation of Columns to Section IV.

a.

Reference Code.

The code scheme

recorded in column 1, section III.

b. Remarks.

This column list infor­mation pertinent to the maintenance
function being performed as indicated on
the MAC, section II.

(3)

Service
Replace

MAINTENANCE C4TEGORY

—

c

(4)

o

F

.1

.5
.5
.2
.2

!.

o

D

H

(5)

TOOLS AND

EQUIPMENT

(6)

REMARKS

B-3

TM9-6625-2801-14&P

SECTION III. TOOL AND TEST EQUIPMENT REQUIREMENTS

FOR TEKTRONIX TIME DOMAIN REFLECTOMETER TYPE 1502-1

TOOL OR TEST

EQUIPMENT MAINTENANCE NATIONAL/NATO TOOL

REF NUMBER CATEGORY NOMENCLATURE STOCK NUMBER NUMBER

1 F FLUKE 8000A

DIGITAL MULTIMETER

2 F SHORTED BNC CONNECTOR

B-4

APPENDIX C

MAINTENANCE REPAIR PARTS LIST

TM 9-6225-2801-14&P

C-1. Introduction.
authorized repair parts for performance
of maintenance of the Time Domain Re­flectometer Tektronix Type 1502-1.

C-2. Explanation of Columns. The
following provides an explanation of
columns found in the listings.

a.

Figure.

figure number of the illustration in which

the item is shown.

b. Item.
number used to identify each item called
out in the illustration.

c.

Part No. This column indicates the
primary number used which controls the
design and characteristics of the item by
means of its engineering drawings, speci­fications, standards, and inspection re­quirements, to identify an item or range
of items.

When a stock numbered item is
requisitioned, the repair part
received may have a different
part number than the part
being replaced.

d. Description.

the item name and a minimum description

to identify the item.

e.

Manufacturer.
vides the name of the manufacturer of a
part where the manufacturer differs
from the manufacturer of the Time
Domain Reflectometer.

C–3. Abbreviations.

"
#

Actr

This column indicates the

This column indicates the

Inch
Number size
Actuator

This appendix lists

NOTE

This column provides

This column pro-

Adptr
Align
Al
Assem
Assy
Atten
AWG
Bd

Brkt
Brs

Brz

Bshg
Cab
Cap
Cer
Chas
Ckt
Comp

Conn
Cov
Cplg
Crt
Cur
Deg

Dia

Dwr
Elctrn
Elec
Elctlt
Elem
EPL
Eqpt

Fb

Ext

Fil
Flex
Flh
Flm
Fltr
Fr
Fstnr
Ft
Fxd

Gskt
Hd
Hdl
Hex
Hex hd

Adapter

Alignment
Aluminum
Assembled
Assembly
Attenuator
American wire gage
Board
Bracket
Brass
Bronze

Bushing
Cabinet
Capacitor
Ceramic
Chassis
Circuit
Composition

Connector
Cover
Coupling
Cathode ray tube
Current
Degree
Diameter
Drawer
Electron
Electrical
Electrolytic
Element

Electrical parts list
Equipment
Fast blow
External
Fillister head
Flexible

Flat head
Film

Filter

Frame or front
Fastener
Foot
Fixed
Gasket
Head

Handle

Hexagon

Hexagonal head

C-1

TM 9-6225-2801-14&P

Hex soc
Hlcps
Hlext
Hv
IC
ID
Ident
Implr
In
Incand
Insul
Intl
LED
Lphldr
Mach
Mech
Met
Mtg
Nip
Non wir
OBD
OD
Ovh
PC
PCB
Ph brz
Pl

Plstc
PN
Pnh

Pwr
Qtz
Rcpt

Res

Rf

Rgd

Hexagonal socket
Helical compression
Helical extension
High voltage
Integrated circuit
Inside diameter
Identification
Impeller
Inch
Incandescent

Insulator
Internal
Light emitting diode
Lampholder
Machine
Mechanical

Metal
Mounting
Nipple
Not wire wound

Order by description
Outside diameter

Oval head

Printed circuit

Printed circuit board

Phosphor bronze

Plain or plate

Plastic

Part number

Pan head

Power

Quartz

Receptacle

Resistor

Radio Frequency

Rigid

Rlf
Rtnr

Sch
Scope
Scr
SE
Sect
Sel
Semicond
Sens
Shld
Shldr
Skt
Sl
Slflkg
Slvg

Spr
Sq
SST
Stl

Sw
T

Term
Thd

Thk
Tnsn
Tpg
Trh
V
Var

W/
Wshr
WW
Xfmr
Xstr
Xtal

Relief
Retainer
Socket head
Oscilloscope
Screw
Single end
Section
Selected
Semiconductor
Sensitive
Shield
Shouldered
Socket
Slide
Self-locking
Sleeving

Spring
Square
Stainless steel

Steel

Switch
Tube

Terminal
Thread

Thick
Tension
Tapping

Truss head
Voltage
Variable
With
Washer
Wire wound

Transformer
Transistor

Crystal

C-2

TM9-6625-2801-14&P

TABLE C-1. REPLACEABLE ELECTRICAL PARTS

FIGURE ITEM FIGURE DESCRIPTION

C-1 1 159-0029-00 *FUSE, CARTRIDGE:0.3A,3AG, SLO-BLOW

C-1 1 150-0029-00 *FUSE, CARTRIDGE:0.3A,3AG,SLO-BLOW

C-1 2 159-0128-00 *FUSE, CARTRIDGE:2A,125V, 5SEC

C-1 2 159-0128-00 *FUSE, CARTRIDGE:2A,125V, 5SEC

C-1 2 159-0128-00 *FUSE, CARTRIDGE:2A,125V, 5 SEC

C-1 2 159-0128-00 *FUSE, CARTRIDGE:2A,125V, 5 SEC

C-1 3 016-0595-00 BATTERY PACK

TABLE C-2. STANDARD ACCESSORIES

FIGURE ITEM PART NO. DESCRIPTION

C-2 1 016-0297-00 VISOR, CRT:

C-2 2 103-0028-00 ADAPTER, CONN:BNC TO BNC

C-2 3 011-0123-00 TERM, COAXIAL:50 OHM, BNC

C-2 4 012-0482-00 CABLE ASSY, RF:50 OHM, 36 INCH LONG

C-2 5 161-0066-00 CABLE ASSY, PWR:3 WIRE, 98 INCH LONG

C-2 6 003-0700-01 RULE, SLIDE:TIME DOMAIN REFLECTOMETER

C-2 7 159-0029-00 FUSE, CARTRIDGE:0.3A,3AG,SLO-BLOW

159-0054-00 FUSE, CARTRIDGE:0.15A,3AG,250V,

SLO-BLOW

C-2 8 378-0055-00 FILTER, MESH:CRT

*STOCKED ITEM

C-3

TM 9-6225-2801-14&P

C-4

Figure C-1.

Replaceable electrical parts

TM 9-6225-2801-14&P

Figure C-2.

Standard accessories

C-5/(C-6 blank)

TM 9-6625-2801-14&P

INDEX

Chapter, Para.

Figure, Table

Subject

Number

A, B

Accessories, Control Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3c

Accessories, Use. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3d

Camera Use with TDR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3d(3)

Mesh Filter for the CRT... . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3d(1)

Viewing Hood . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3d(2)

C

Cable Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Cable Problems, Typical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Cable Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Connection of Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Evaluating a Discontinuity . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Locating a Discontinuity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Other Than 50 Ohms Impedance . . . . . . . . . . . . . . . . . . . . . . . . .

Typical Cable Problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Camera Use With TDR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Checkout Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Checks, Detailed Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Cart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Equipment Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Fogging Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Horizontal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Preliminary Connections and Set-up . . . . . . . . . . . . . . . . . . . . . .

Trace Focus and Astigmatism . . . . . . . . . . . . . . . . . . . . . . . . . . .

Trace Geometry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Trace Rotation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Vertical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Voltage Measurements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

X-Y Output Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Circuit Analysis, Simplified . . . . . . . . . . . . . . . . . . . . . .. .....

Chart Recorder ...... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Puller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Sampling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Cleaning

Crt Implosion Shield . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Exterior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Interior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Content Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Control Settings

Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

TDR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2-4
2-4e
2-4
2-4a
2-4c
2-4b
2-4e
2-4d
1-3, 3-9
2-2d(3)

3-2
5-4
5-4f
5-4b

5-4l
5- 4k

5-4a

5-4d

5-4c

5-4g

5-4i

5-4h

5-4j
5-4e
5-4m
4-1

4-1c

4-1a
4-1b

3- 6d
3- 6

C

3-6a
3-6b
1-1b

2-3c
2-3b

Index 1

TM 9-6625-2801-14&P

Subject

INDEX - Continued

Chapter, Para.

Figure, Table

Number

D,E

Depot Repaired
Description . . .

Accessories
General . . .

Main Case .

Destruction of Material to Prevent Enemy Use . . . . . . . . . . . . . . . .

Detailed Performance Checks and Adjustments . . . . . . . . . . . . . . . .

Crt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Equipment Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Fogging Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Horizontal.. . . . . . . . . . .

Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Preliminary Connections and Set-up . . . . . . . . . . . . . . . . . . . . . .

Trace Focus and Astigmatism . . . . . . . . . . . . . . . . . . . . . . . . . . .

Trace Geometry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Trace Rotation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Vertical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Voltage Measurements.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

X-Y Output Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Discontinuity

Evaluation of . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Location of . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

7-2
1-6
1-6b(2), T 1-1
1-6a
1-6b(1)
1-4
5-4
5-4f
5-4b
5-4l

5-4k
5-4a
5-4d
5-4C
5-4g
5-4i
5-4h
5-4j
5-4e
5-4m

2-4c
2-4b

F, G, H

Fault Isolation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Final Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Final Inspection Checks. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Forms and Records . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Front Panel Controls and Indicators . . . . . . . . . . . . . . . . . . . . . . . .

Fuses, Repair and Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . .

5-5, T 5-1
8-1
8-2, T 8-1
1-2
2-1, T 2-1,
7-4a

F 2-1

I, J, K

Incident and Reflected Pulses . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Inspection and Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

F 2-4

9-4

L

Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-4

Index 2

TM 9-6625-2801-14&P

INDEX - Continued

Chapter, Para.

Figure, Table

Subject

Number

M, N

Maintenance Allocation Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1

Maintenance Efforts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2, T6-1

Maintenance Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1

Maintenance Repair Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-1

Mesh Filter Use . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2-3d(1)

O

Operating Power Selection

Battery Connections . .

230 Volt Operation . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . ........

2-2
2-2a, F 2-2
2-2b, F 2-3

P, Q

Performance Checks . . . . .

Performance Checks/Fault Isolation . . . . . . . . . . . . . . . . . . . . . . . .

Preparation for Shipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Packing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Shipping Documents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Preparation for Performance Checks . . . . . . . . . . . . . . . . . . . . . . . .

Preparation for Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Preparation for Travel (In Shelter) . . . . . . . . . . . . . . . . . . . . . . . . .

Preventive Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Purpose . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5-3
5-1
9-2

9-2a
9-2b

5-2

9-3
9-1
3-5
1-1a

R

References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Repair and Replacement Instructions . . . . . . . . . . . . . . . . . . . . . . .

Case . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Fuses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Repair Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Repair Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Replaceable Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...

App. A

7-4
7-4b
7-4a
7-1

3-3

C-1

S

Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ......

Servicing Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Shipment, Preparation for . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Packing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Shipping Documents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Simplified Circuit Analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Chart Recorder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Pulser . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...

Sampling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Storage, Preparation for . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-1
3-7
9-2
9-2a
9-2b
4-1
4-1c
4-1a
4-1b

9-3

Index 3

TM 9-6625-2801-14&P

Subject

INDEX - Continued

Chapter, Para.

Figure, Table

Number

T

Tabulated Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

TDR Control Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Travel (In Shelter), Preparation for . . . . . . . . . . . . . . . . . . . . . . . .

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Turn-on Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-7, T

2-3b

9-1
T 5-1
2-3

1-2

U

Unpacking and Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-1

V

Viewing Hood Use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2-3d(22)

W, X, Y, Z

Watertight Seals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-8

Index 4

By Order of the Secretary of the Army:

Official:

ROBERT M. JOYCE

Brigadier General, United States Army

The Adjutant General

Distribution:

TM 9-6625-2801-14&P

E. C. MEYER

General, United States Army

Chief of Staff

To be distributed in accordance with Special List.

TM 9-6625-2801-14&P

049589