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TM 9-6625-474-14&P-3



TECHNICAL MANUAL


OPERATOR, ORGANIZATIONAL,
DIRECT SUPPORT, AND GENERAL SUPPORT
MAINTENANCE MANUAL
(INCLUDING REPAIR PARTS)
FOR



UNIVERSAL COUNTER/TIMER,
TEKTRONIX, MODEL DC 503A
(NSN 6625-01-114-4890)




DEPARTMENT OF THE ARMY 26 DECEMBER 1984
TM 9-6625-474-14&P-3


WARNING




DANGEROUS VOLTAGE
is used in the operation of this equipment
DEATH ON CONTACT
may result if personnel fail to observe safety precautions



Never work on electronic equipment unless there is another person nearby who is familiar with the
. .
operation and hazards of the equipment and who is competent in administering first aid. When the
technician is aided by operators, he must warn them about dangerous areas.
Whenever possible, the power supply to the equipment must be shut off before beginning work on the
equipment. Take particular care to ground every capacitor likely to hold a dangerous potential. When
working inside the equipment, after the power has been turned off, always ground every part before
touching it.
Be careful not to contact high-voltage connections when installing or operating this equipment.
Whenever the nature of the operation permits, keep one hand away from the equipment to reduce the
hazard of current flowing through vital organs of the body.

WARNING


Do not be misled by the term "low voltage." Potentials as low as 50 volts may cause death under adverse
conditions.
COMMON and probe ground straps are electrically connected. Herefore, an elevated reference applied to
any is present on each - as indicated by the yellow warning bands under the probe retractable hook tips.
For Artificial Respiration, refer to FM 21-11,

Power Source

This product is intended to operate in a power module connected to a power source that will not apply more
than 250 volts rms between the supply conductors or between either supply conductor and ground. A
protective ground connection by way of the grounding conductor in the power cord is essential for safe
operation.

a/(b blank)
TM 9-6625-474-14&P-3


Copyright 1980 Tektronix, Inc. All rights reserved.
Reproduced by permission of copyright owner.

TECHNICAL MANUAL HEADQUARTERS
DEPARTMENT OF THE ARMY
No. 9-6625-474-14&P-3 Washington, D. C., 26 December 1984


OPERATOR, ORGANIZATIONAL, DIRECT SUPPORT,
AND GENERAL SUPPORT MAINTENANCE MANUAL
(INCLUDING REPAIR PARTS)
FOR
UNIVERSAL COUNTER/TIMER,
TEKTRONIX, MODEL DC 503A
(NSN 6625-01-114-4890)

REPORTING OF ERRORS

You can help improve this manual. If you find any mistakes or if you know of a way
to improve the procedures, please let us know. Mail your Ietter or DA Form 2028
(Recommended Changes to Publications and Blank Forms), direct to: Command-
er, US Army Missile Command, ATTN: DRSMI-SNPM, Redstone Arsenal, AL
35898-5238. A reply will be furnished to you.

TABLE OF CONTENTS
Page
L I S T O F I L L U S T R A T I O N S iii
LIST OF TABLES . . . . . . . . . . . . . . . . . . . IV
SECTION 0 GENERAL NFORMATION 0-1
Scope 0-1
indexes of Publications 0-1
Forms, Records, and Reports 0-1
Reporting Equipment Improvement Recommendations (EIRs) 0-1
Administrative Storage 0-1
Destruction of Army Electronics Materiel. 0-1
SECTION 1. SPECIFICATION . . . . . . . . . . . . . . . . . . . 1-1
SECTION 2. 2-1
2-1
2-2
2-4
2-4
2-5
2-7
SECTION 3. THEORY OF OPERATION. 3-1
SECTION 4. 4-1
4-1
4-8
SECTION 5. MAINTENANCE 5-1



This manual is, in part, authenticated manufacturer's commercial literature. Recommended Spare Parts List has been added to supplement the commercial
literature. The format of this manual has not been structured to consider levels of maintenance.
TM 9-6625-474-14&P-3

TABLE OF CONTENTS (CONT)
Page

SECTION 6. OPTIONS 6-1

SECTION 7. REPLACEABLE ELECTRICAL PARTS 7-1

SECTION 8. DIAGRAMS AND CIRCUIT BOARD ILLUSTRATIONS 8-1

SECTION 9. REPLACEABLE MECHANICAL PARTS 9-1

APPENDIX A. REFERENCES A-1

APPENDIX B. MAINTENANCE ALLOCATION CHART (MAC) B-1

APPENDIX C. RECOMMENDED SPARE PARTS LIST C-1

APPENDIX D. MANUAL CHANGE INFORMATION D-1




ii
TM 9-6625-474-14&P-3

LIST OF ILLUSTRATIONS

Fig. No. Title Page

0-1 DC 503A Universal Counter/Timer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0-2
2-1 Plug-ln lnstallation/Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
2-2 Controls and Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
2-3 Triggering Circuit Response to Improper (A) and
Proper (B) Level Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
2-4 Representation of lnterval Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9
2-5 Typical CHAand CH B Level out Voltage Settings for
Various Time interval Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10
2-6 Illustration ofCH A Events Counted from Portion of
CH A Signal Pulses during the Counter Gate Open
Time (Controlled by the CH B Signal) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11
3-1 Typical DC 503A Timing Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
4-1 Check Set-Up for the High Frequency Sensitivity
Using X1 and X5 Attenuation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
4-2 Check Set-Up for Low Frequency ac and dc Sensitivity . . . . . . . . . . . . . . . 4-6
4-3 Check Set-Up for Minimum Pulse Width Signals . . . . . . . . . . . . . . . . . . . . . 4-8
4-4 Check Set-Up for Trigger Level Range (3.5V) and
Accuracy (Y20mVf0.59'0 of Reading) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-12
5-1 Typical Square Pin Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3
5-2 Exploded View of Circuit Board Pin and Ferrule . . . . . . . . . . . . . . . . . . . . . . 5-3
5-3 Dual Entry Circuit Board Pin Socket . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4
5-4 Bottom Entry Circuit Board Pin Socket . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4
5-5 Orientation and Disassembly of Multipin Connectors . . . . . . . . . . . . . . . . . 5-4
5-6 Rear Frame Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-5
5-7 Circuit Board Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-5
5-8 Pushbutton Switch Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-5
5-9 Rear Interface Connector Assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-7
5-10 Rear Interface Timing for a Display of 1079.0674 . . . . . . . . . . . . . . . . . . . 5-8




iii
TM 9-6625-474-14&P-3

LIST OF TABLES

Table No. Title Page

1-1 Electrical Characteristics . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
1-2 Miscellaneous . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
1-3 Environmental . . . ....... . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
1-4 Physical Characteristics ... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8

2-1 Frequency A Display Check. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
2-2 Period B, Time A-B, Width B (Timing Mode)
Display Check 2-6
2-3 Period B, Time A- B, Width B (Averaging Mode)
Display Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
2-4 Ratio A/B and Events A During B Display Check . . . . . . . . . . . . . . . . . . . . . 2-6
2-5 Gate Time vs Measurement Resolution . . . . . . . . . . . . . . . . . . . . . . 2-8
3-1 PROM Selection Code . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10
4-1 List of Test Equipment Requirements . . . . . . . . . . . . . . . . . . . . 4-2
5-1 Relative Susceptibility to Static Discharge Damage 5-1




iv
TM 9-6625-474-14&P-3


SECTION 0

GENERAL INFORMATION


0-1. Scope. This manual contains instructions for 0-4. Reporting Equipment Improvement Recom-
the operator, organizational, direct support, and gen- mendations (EIR). If your DC 503A needs im-
eral support maintenance of and calibration proce- provement, let us know. Send us an EIR. You, the
dures for Tektronix Universal Counter/Timer, Model DC user, are the only one who can tell us what you don't
503A. Throughout this manual, Tektronix Universal like about your equipment. Let us know why you don't
Counter/Timer, Model DC 503A is referred to as the like the design. Tell us why a procedure is hard to
DC 503A. perform. Put it on an SF 368 (Quality Deficiency
Report). Mail it to Commander, U.S. Army Missile
0-2. Indexes of publications. a. DA Pam 310-4. Command, ATTN: DRSMI-QMD, Redstone Arsenal,
Refer to the latest issue of DA Pam 310-4 to deter- AL 35898-5290. We'll send you a reply.
mine whether there are new editions, changes, or
additional publications pertaining to Tektronix Univer- 0-5. Administrative Storage. To prepare the Tek-
sal Counter/Timer, Model DC 503A. tronix Universal Counter/Timer, Model DC 503A for
placement into and removal from administrative stor-
b. DA Pam 310-7. Refer to the latest issue of DA
age, refer to Section 3, Chapter 4, AR 750-25-1,
Pam 310-7 to determine whether there are modifica-
Maintenance of Equipment and Supplies. Temporary
tion work orders (MWO'S) pertaining to Tektronix
storage should be accomplished in accordance with
Universal Counter/Timer, Model DC 503A.
TB 750-25-1, Section 2, Maintenance of Supplies and
Equipment.
0-3. Forms, Records, and Reports. Department of
Army forms and procedures used for equipment main-
0 - 6 . D e s t r u c t i o n o f A r m y Electronics
tenance and calibration are those prescribed by TM
Materiel. Destruction of Tektronix Universal Counter/
38-750, The Army Maintenance Management System.
Timer, Model DC 503A to prevent enemy use shall be
Accidents involving injury to personnel or damage to
in accordance with TM 750-244-2.
materiel will be reported on DA Form 285, Accident
Report, in accordance with AR 385-40.




0-1
TM 9-6625-474-14&P-3




Fig. 0-1. DC 503A Universal Counter/Timer


0-2
TM 9-6625-474-14&P-3

SECTION 1


SPECIFICATION
Instrument Description Instrument Options
The DC 503A Universal Counter/Timer is designed to Option 01 replaces the internal 10 MHz time base
operate in a TM 500-series power module. (clock) circuit with a self-contained proportional
temperature controlled oven oscillator for increased ac-
curacy and stability.
The instrument has two input channels, CH A and CH
B, each with 125 MHz capability. Each channel has
separate triggering level, triggering slope, attenuator, and
coupling mode controls.
Standard Accessories
The DC 503A has eight measurement functions: FRE- 1 Instruction Manual
QUENCY A, PERIOD B, WIDTH B, TIME A - B,
RATlO A/B, EVENTS A DURING B, TOTALIZE A, and 1 Cable assembly, bnc-to-tip jack.
TIME MANUAL. All of the modes except FREQUENCY A,
TOTALIZE A, and TIME MANUAL have the capability of
averaging the selected measurement over a range of 1 to NOTE
10* times the input signal. The signals to be counted or
measured can be applied via front panel bnc connectors or Refer to the tabbed Accessories page at the rear of
through the rear Interface. this manual for more information.

The triggering level for each channel can be monitored
via the front panel or the rear i nterface connections. The
buffered voltage available at these connectors cor- Performance Conditions
responds to the trigger levels set by the front panel
controls. The limits stated in the Performance Requirements
columns of the following tables are valid only if the
DC 503A has been calibrated at an ambient temperature
The output of the internal signal shaping circuits can between +20