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Instruction Manual
'Tektronix
DC 504A
Counter/Timer
070-4291-00
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Instruction Manual
Tektronix
i
DC 504A
Counter/Timer
070-4291-00
Warning
The servicing instructions are for useby qualified
personnel only. To avoid personal injury, do not
perform any servicing unless you arequalified to
do so . Refer to the Safety Summary prior to
performing service.
Please check for change information at therear
of this manual.
First Edition: January 1983
Last Revised: June 1988
Tektronix warrants that this product will be free from defects in materials and workmanship for a period of one (1)
year from the date of shipment. If any such product proves defective during this warranty period, Tektronix, at its
option, either will repair the defective product without charge for parts and labor, or will provide a replacement in
exchange for the defective product .
In order to obtain service under this warranty, Customer must notify Tektronix of the defect before the expiration
of the warranty period and make suitable arrangements for the performance of service. Customer shall be
responsible for packaging and shipping the defective product to the service center designated by Tektronix, with
shipping charges prepaid . Tektronix shall pay for the return of the product to Customer if the shipment is to a
location within the country in which the Tektronix service center is located. Customer shall be responsible for
paying all shipping charges, duties, taxes, and any other charges for products returned to any other locations .
This warranty shall not apply to any defect, failure or damage caused by improper use or improper or inadequate
maintenance and care. Tektronix shall not be obligated to furnish service under this warranty a) to repair damage
resulting from attempts by personnel other than Tektronix representatives to install, repair or service the product ;
b) to repair damage resulting from improper use or connection to incompatible equipment; or c) to service a
product that has been modified or integrated with other products when the effect of such modification or
integration increases the time or difficulty of servicing the product.
THIS WARRANTY IS GIVEN BY TEKTRONIX WITH RESPECT TO THIS PRODUCT IN LIEU OF
ANY OTHER WARRANTIES, EXPRESSED OR IMPLIED . TEKTRONIX AND ITS VENDORS
DISCLAIM ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A
PARTICULAR PURPOSE . TEKTRONIX' RESPONSIBILITY TO REPAIR OR REPLACE DEFECTIVE
PRODUCTS IS THE SOLE AND EXCLUSIVE REMEDY PROVIDED TO THE CUSTOMER FOR
BREACH OF THIS WARRANTY TEKTRONIX AND TTS VENDORS WII,L NOT BE LIABLE FOR ANY
~a INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES IRRESPECTIVE OF
WHETHER TEKTRONIX OR THE VENDOR HAS ADVANCE NOTICE OF THE POSSIBILTTY OF
SUCH DAMAGES .
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TABLE OF CONTENTS
List of Illustrations. . . . . . . . - . . . . . . . . . . . . ' . . . . . iii
List of Tables iii wA R N I KG
Operators Safety Summary . . . . . . . . . . . . . . . . . . . iv
E Servicing Safety Summary . . . . . . . . . . . . . . . . . . . v
THE FOLLOWING SERVICING INSTRUCTIONS
ARE FOR USE BY QUALIFIED PERSONNEL ONL Y.
Section 1 SPECIFICATION TO AVOID PERSONAL INJURY, DO NOTPERFORM
ANY SERVICING OTHER THAN THAT CONTAINED
Instrument Description . . . . .. . . . . . 1-1 IN OPERATING INSTRUCTIONS UNLESS YOU ARE
Standard Accessories . . . . . 1-1 QUALIFIED TO DO SO. REFER TO OPERATORS
Performance Conditions . . . . . . . . . . . 1-1 SAFETY SUMMARY AND SERVICE SAFETY SUM-
Electrical Characteristics . . . . . . . . . . 1-2 MARY PRIOR TO PERFORMING ANY SERVICE.
_ Environmental . . . . . . . . . . . . . . . . . . 1-6
Physical Characteristics . . .. . . . . . . 1-7
Section 2 OPERATING INSTRUCTIONS
Page
Introduction . . . . . . . . . . . . . . . . . . . . 2-1
Preparation For Use . . . . . . . . . . . . . 2-1 Section 3 THEORY OF OPERATION
First Time Inspection . . . . . : . . . . 2-1
Operating And Non-Operating Introduction . . . . . . . . . . . . . . . . ... . 3-1
Environments . . . . . . . . . . . . . . . . 2-1 Block Diagram . . . . . . . . . . . . . . . .. . 3-1
Rear Intertace Considerations . . . 2-1 Input Conditioning . . . . . . . . . . . ... . 3-1
Installation And Removal . . . . . . . . . 2-1 Signal Routing . . . . . . . . . . . . . . .... 3-1
Controls And Connectors . . . . . . . . . 2-2 Direct . . . . . . . . . . . . . . . . . . . . . . 3-1
Operating Considerations . . . . . . . . . 2-5 Prescaler . . . . . . . . . . . . . . . . . . . . 3-1
Input Connections . . . . . . . . . . . . . . . 2-5 X100 Multiplier . . . . . . . . . . . . . . 3-1
Maximum Safe Input Voltage Limits 2-5 Counter . . . . . . . . . . . . . . . . . . . . . . . 3-2
Connecting External Signal Sources 2-5 Function, Range, And Decimal Select 3-4
Input Coupling, Noise, Function Select . . . . . . . . . . .. . . . 3-4
And Attenuation . . . . . . . . . . . . . . 2-5 Range Select . . . . . . . . . . . .. . . . 3-4
Triggering . . . . . . . . . . . . . . . . . . . 2-6 Decimal Point Logic . . . . . . . . . . . 3-4
Input Coupling Switch . . . . . . . 2-6 Autorange . . . . . . . . . . . . . . . . . . . . . 3-5
Trigger Level . . . . . . . . . . . . . . 2-6 Display . . . . . . . . . . . . . . . . . . . . . .. . 3-6
Reducing Measurement Errors . . . 2-6 Power Supplies . . . . . . . . . . . . . . .. . 3-6
Frequency Measurements . . . . . . . . . 2-6
Measurement Intervals . . . . . . . . . 2-6
Overflow . . . . . . . . . . . . . . . . . . . . 2-6 Section 4 CHECKS ANO ADJUSTMENTS
Frequencies Lower Than 10 MHz 2-7
Frequencies Higher Than 10 MHz 2-7 Performance Check Procedure . . . . . 4-1
Period Measurements . . . . . . . . . . . . 2-8 Introduction . . . . . . . . . . . . . . . . . . 4-1
Low Frequencies . . . . . . . . . . . . . 2-8 Adjustment Interval . . . . . . . . . . . 4-1
0 Period Averaging . . . . . . . . . . _ . . 2-8 Services Available . . . . . . . . . . . . . 4-1
Width Measurements . . . . . . . . . . . . 2-8 Test Equipment Required . . . . . . . 4-1
Width Averaging . . . . . . . . . . . . . . 2-8 Adjustment Procedure . . . . . . . . . . . . 4-7
Totalizing . . . . . . . . . . . . . . . . . . . . . . 2-9 Introduction . . . . . . . . . . . . . . . . . . 4-7
Starting The Count . . . . . . . . . . . . 2-9 Test Equipment Required . . . . . . . 47
Repackaging For Shipment . . . . . . . . 2-9 Preparation . . . . . . . . . . . . . . . . . . 4-7
DC 504A
TABLE OF CONTENTS (cont)
Page
Section 5 MAINTENANCE Section 6 OPTIONS
Static Sensitive Components . . . . . . 5-1
Test Equipment . . . . . . . . . . . . . . . - . 5-1 Section ? REPLACEABLE ELECTRICAL PARTS
Cleaning Instructions . . . . . . . . . . . . . 5-2
Exterior . . . . . . . . . . . . . . . . . . . - - 5-2
Interior . . . . . . . . . . . - . . . . . . . - - 5-2 Section 8 DIAGRAMS AND ILLUSTRATIONS
Obtaining Replacement Parts . . . . . . 5-2
Ordering Parts . . . . . . . - - . . - - - - - - - 5-2 Adjustment Locations
Soldering Techniques . . . . . . . . . . . . 5-2 Block Diagram
Interconnecting Pins . . . . . . . . . . . - . 5-3 Schematic Diagrams
Square Pin Assemblies . . . . . . . . . . . 5-3 Parts Location Grids And
Multipin Connectors . . . . . . . . . . . . . 5-3 Reference Charts
Semiconductors . . . . . . . . . . . . . . . . . 5-3
Release Latch Removal . . . . . . . . . . 5-4
Main Circuit Board (A12) Removal . . 5-4 Section 9 REPLACEABLE MECHANICAL
Display Circuit Board (A10) Removal 5-4 PARTS
Internal Jumpers . . . . . . . . . . . - . . . - 5-5
Test Fixture Connectors . . . . . . . . . . 5-5
Rear Interface Connector . . . . . . . . . 5-5
Functions Available . . . . . . . . - . . - 5-5
Change Information
DG 504A
LIST OF ILLUSTRATIONS
Fig.
No .
Page
2-7 Plug-in Installation And Removal . . . .. . . . . , . . . . . . .,,, . . ,,,. , , , ,..,,, . , , , . . .. , . . .. , . ..
~ . . . .~ 2-2
2-2 Controls and Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ._ 2~
2~ Advantages In Signal Attenuation . . . . . . . . . . . . . . . . . . . . . , . . . . _ - , _ . . . - . . . ~ ~. - ~ ~ .. . 2-5
2-4 ~
Frequency Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-
~ 2-7
2-5 Period Measurement . . . . . . . . . . . . . . .. . . . . . .... . . . . . .. . . . . ..... . . . .. .. . . . . ... . . . . . . . . . 2-8
2-6 Width Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .'
2-9
3-1 Relationship of display update and counter reset signals . . . . . . . . . . . . . . . . . . . . . . , , , . _ , , , _ , , - . , . ~ ~ 3~
5-1 Typical Square Pin Assembly . . . . . . . . . . . . . . . . . . . . , . , . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ~ ~ 5-3
5-2 Orientation And Disassembly of Multipin Connectors . . . . . . . . . . . . . . . . , , . , , . , _ , , , _ _ . , . . . - . . - . , . . 5-3
5-3 Rear Intertace Connector Assignments . . . . . . . . . . . . . . . . . . . . , , . , , , , , , , , , , . , , , , . . . , , - . . . . _ _ . . , 5-6
NOTE
The following illustrations appear in the Diagrams and Illustrations fold-
out section.
&1 Adjustments And Test Points (Display Board)
8-2 Adjustments And Test Points (Main Board)
8-3
Thru Parts Location Grids
8-9
LIST OF TABLES
Table
No.
Page
1-1 E~ectrical Characteristics . . . . . .. . . . . . . . . ... . ..... . . . . . . . .. . . . . . .. . . . . . . . . . . . . . .. .. . . . . . . 1-2
1-2 Environmental . . . . . . . . . .
. . . . . .... . . . . . . . . .. . . . . .. . .... . . . . . ... . .. . . . . . . .. . . . . . . . . . . . 1-6
1-3 Physical Characteristics . .. . . . . . . . . . . . . . .. . ... .,. . . . . . . .. . . '
. . .... . . . . . . . . . . . . .
2-1 Gate Time vs Measurement Resolution . . , . . . . . . . . . . . . . . . , . . , , , ,,, , , ,.,, . . . _ _._ _ _ ~ ~ ~ ~ ~ ~ ~ 2-~
3-1 Counter Input, Function/Range Select, And Time Slot Relationships . . .. . . . . . . . . . . .., , . . , . , . _ , . , , , 3-4
&2 Time 51ot to Decimal Point Relationship . . . . . . . . . . . . . . , , . . . , . _ . ,, , , . , , , . . . , , -.. . . - . . . - . . . - 3-5
4-1 List of Test Equipment Requirements . . . . . . . . . . . . . . . , . . . . . , , , , , , , _ . , , . . - , , . . . , , - _ - ~ . 4-2
5-1 Relative Susceptability To Static Discharge Damage . . . . . . . . . . . . . . , . . . . , , , . , , , . , . , , _ , . . . . . _ . . .
5-1
NOTE
The following fables appear in the Diagrams and Illustrations foldout
section.
&1
Thru Component Reference Charts
8-5
DC 504A
OPERATORS SAFETY SUMMARY
This general safety information is for both operating and Power Source
servicing personnel. Specific warnings and cautions will be
found throughout the manual where they apply, but may not This product is designed to operate from a power module
appear in this summary. connected to a power source that does 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
TERMS cord is essential for safe operation .
In This Manual
CAUTION statements identify conditions or practices that Grounding The Product
can result in damage to the equipment or other property . This product is grounded through the grounding conductor
of the power module power cord . To avoid electrical shock,
WARNING statements identify conditions or practices that plug the power cord into a properly wired receptacle before
connecting to the product input or output terminals. A pro-
can result in personal injury or loss of life . tective ground connection by way of the grounding conduc-
tor in the power cord is essential for safe operation.
As Marked on Equipment
CAUTION indicates a personal injury hazard not immediate- Danger Arising From Loss of Ground
ly accessible as one reads the marking, or a hazard to prop- Upon toss of the protective-ground connection, all accessi-
erty including the equipment itself . ble conductive parts (including knobs and controls that may
appear to be insulating) can render an electric shock.
DANGER indicates a personal injury hazard immediately ac-
cessible as one reads the marking.
Use The Proper Fuse
To avoid fire hazard, use only the fuse specified in the parts
SYMBOLS fist for your product, and which is identical in type, voltage
rating and current rating .
In This Manual
This symbol indicates where applicable Refer fuse replacement to qualified service personnel.
cautionary or other information is to be found.
Do Not Operate in Explosive Atmospheres
As Marked on Equipment To avoid explosion, do not operate this product in an atmo-
sphere of explosive gases unless it has been specifically
certified for such operation.
DANGER - High voltage.
Protective ground (earth) terminal . Do Not Operate Plug-In Unit Without Covers
ATTENTION - refer to manual . To avoid personal injury, do not operate this product with-
out covers or panels installed. Do not apply power to the
Refer to manual plug-in via a plug-in extender .
iv
SERVICING SAFETY SUMMARY
FOR QUALIFIED SERVICE PERSONNEL ONLY
Refer also to the preceding Operators Safety Summary
Do Not Service Alone Do Not Wear Jewelry
Do not pertorm internal service or adjustment of this prod- Remove jewelry before servicing this instrument . Rings.
uct unless another person capable of rendering first aid and necklaces, and other metallic objects could come into con-
resuscitation is present. tact with dangerous voltages and currents .
Use Care When Servicing With Power On
Power Source
Dangerous voltages may exist at several points in this prod-
uct. To avoid personal injury, do not touch exposed connec- This product is intended to operate from a power module
lions and components white power is on . connected to a power source that will not apply more than
250 volts rms between the supply conductors or betwen
either supply conductor and ground . A protective ground
Disconnect power before removing protective panels, sol- connection by way of the grounding conductor in the power
Bering, or replacing components. cord is essential for safe operation.
504A COUN7ERlTIMER
DC
VI
Section 1-DC 504A
SPEC1FtCAT10N
Instnrment Description NOTE
The TEKTRONIX DC 504A is a multi-function counter/timer Refer to the tabbed Accessories page at the rear of
designed to operate in one compartment of any TM 500 or this manual for more information .
TM 5000-Series power module .
Performance Conditions
Frequency measurements to 100 MHz are within the capa-
bility of the DC 504A . Frequencies above 10 MHz are inter- The limits stated in the Performance Requirements column
nally prescaled. Measurement of pulse widths and periods of the following tables are valid only if the DC 504A has
at rates up to 2.5 MHz is possible . Width and Period averag- been adjusted at an ambient temperature between +20