Tektronix DC503a User manual

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7~Ictronbc
INSTRUCTION MANUAL
Tektronix, Inc .
P .O . Box 500
Beaverton, Oregon

97077

Serial Number
COMMITTED TOEXCELLENCE
PLEASE CHECK FOR CHANGE
INFORMATION
AT THE REAR OF THIS MANUAL .
D C 50~A
UNIVERSAL
COUNTER/TAMER
With Options
070-2971-00

First Printing JUN 1980
Product
Group 75

Revised DEC 1981

Copyright © 1980 Tektronix, Inc .
All rights reserved .

Copyright ©

1980
durch
Tektronix, Inc . Alle
Rechte vorbe-
Contents of this publication may not be
reproduced in any

halten . Der Inhalt dieser Publikation dart ohne
Genehmigung
form without the written
permission of Tektronix, Inc .

von Tektronix, Inc . nicht weitergegeben werden .
Products of Tektronix,
Inc . and its subsidiaries are covered

Produkte von Tektronix, Inc . and seinen Tochtergesellschaften
by U .S . and
foreign patents and/or pending patents .

sind durch
US-and
Auslandspatente and/oder schwebende
Patente abgedeckt .
TEKTRONIX, TEK, SCOPE-MOBILE,
and

are reg-
istered trademarks of
Tektronix, Inc .

TEKTRONIX, TEK, SCOPE-MOBILE and

sind
geschutzte
Warenzeichen von Tektronix, Inc .
Printed in U .S .A
. Specification and price
change
privileges
are reserved .

Gedruckt

in

U .S .A .

Spezifikations- and

Preis~nderungen
bleiben vorbehalten
.
Copyright © 1980
TEKTRONIX INC . Tous droits r~serv~s .
Le contenu de ce
manuel ne peut ~tre reproduit sous quelque for-
me que ce soit sans I'accord
de Tektronix Inc .
Tous les produits
TEKTRONIX sont brevets US et Etranger et
les logotypes TEKTRONIX, TEK SCOPE MOBILE, sont
d~pos~s .
©
1980
~KTR~~PjT~T ~J
I'
Ca =l
~~f,~ Ta~~~~
TEKTRONIX, TEK,
SCOPE-MOBILE,
ItT7 h o=7~~f~sS~~~
z~a
Imprim~ aux USA
. TEKTRONIX se reserve le droit de modifier
:

*(~ i=
-~ ~~]~I) 
1f~']<j'Z iJ1f~~~13
~ q
~a
C ~~~~f~
pract~ristiques
et prix daps le cadre de d~veloppements techno-
logiques .

o
h
:
~
h
~ ~

LIST OFTABLES
. . . . . ..................,
vi
OPERATOR'S SAFETY SUMMARY
...........
vii
SERVICE SAFETY SUMMARY ...............
viii
TABLE OF
CONTENTS
Section 1
SPECIFICATION ........... . ...
1-1
Instrument Description . ...... . .
1-1
Instrument
Options ........... .

1-1
Standard
Accessories .......... 1-1
Performance Conditions ........
1-1
Electrical
Characteristics ........

1-2
Miscellaneous
............... 1-7
Environmental ...............
1-7
Physical Characteristics ........
1-8
OPERATORS PART-ENGLISH
Introduction
................. 2-1
Installation
and Removal ........ 2-1
Controls
and Connectors ......... 2-2
Display and Unit Indicators ......
2-2
Mode Selection and Control
Functions ......... .........
2-2
Channel
A Input and Level Functions 2-4
Input Considerations . . ...... .

. 2-4
Input Sources .... . ....... ...
2-4
Input Coupling ...... .........
2-4
Attenuators
and Maximum Input
Volts ...............
....... 2-4
Sensitivity and Frequency
Range . . 2-4
Slope and Level ............. .
2-4
Operators Familiarization
........ . 2-5
Preparation ................. 2-5
Display Tests ................
2-5
Readout Segment Test .......
2-5
Frequency A Displays ........

2-5
Period
B, Width B, andTimeA -- B
Displays .......... .......
2-5
DC 503A
LIST OF ILLUSTRATIONS ................. v

Section 2

OPERATING
INSTRUCTIONS (cont)
Events
A During B and Ratio A/B
Displays
........... ...... 2-6
Time
Manual Displays . . . . ....

2-6
Totalize A Display ...... ....
2-6
Channel A Slope ......... . .
2-7
Channel B Slope ...........
2-7
Operating Modes . . .............
2-7
General ...........
......... 2-7
Frequency
A Mode . .... ....... 2-7
Period
Modes . ......... ......
2-8
Time Interval Modes ....... ....
2-8
Events A During
B Mode ..... ... 2-10
Ratio Mode
.......... ...... .
2-10
Time Manual Mode ....... .....
2-11
Totalize A Mode .......... ....
2-12
Repackaging for
Shipment ...... . . 2-12
Section 2 OPERATING INSTRUCTIONS ... ...
2-1

OPERATORS PART-FRENCH
Chapitre 2 INSTRUCTION
D'UTILISATION
I ntroduction

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

2-1
Installation et retrait

..... .....

2-1
Commande~ et prises

. .... .....
2-2
Indicateurs d'affichage et d'unites

. .

2-2
Selection du mode d'utilisation et
roles des commander

. .......

2-2
Entree
de
la vole A et fonctions de
niveau . . . ...............
2-4
Description des entrees

........

2-4
Sources . .................
2-4
Couplage ................
2-4
Attenuateurs et tensions d'entree
maximales ..............
2-4
Sensibilite et plage de fr~quence . .

2-4
Pente et niveau de declenchement
.

2-4
Familiarisation de
I'utilisateur avec
I'appareil

........... .....
2-5
Mire en
service

......... ...

2-5
Tests de I'affichage

...... ....

2-5
Test des segments de
1'affichage .

2-5
Affichage de la mesure de
la
fr~quence A

... ..... . .

2-5
Affichage des mesures de
la
p~-
riode B, de
la largeur B et du
temps A ~ B

..... .....

2-6

DC
503A
TABLE OF
CONTENTS
(cont)
Chapitre 2

INSTRUCTION
D'UTILISATION (cont)

Kaptiel 2

BEDIENUNGSANLEITUNG (cont)
Affichage du nombre
d'~v~ne "
ments
presents sur A durant B
et du rapport
A/B

......

2-6
Affichage de la mesure
manuelle
de temps

........ . . . .

2-6
Affichage de la mesure de
tota-
lisation A
(TOTALIZE A) . .

2-6
Pente de la vole A ...... ....

2-7
Pente de la vole B

... .... .

2-7
Modes d'utilisation

....... . . . . .

2-7
G~n~ralit~s ..... . . ... . . ....
2-7
Mode «Mesure de fr~quence»
du
signal de la voie A

. .....

2-7
Mesure de p~riode

..... .....

2-8
Mode «Mesure
d'intervalle de
temps» ... . . ...
. . ...... 2-8
Mode «Mesure des
t :venements A
durant B»

..............
2-10
Mode
«Mesure du rapport»

....
2-11
Mode
«Mesure de temps manuelle»
2-12
Mode
«Mesure de la totalisation A»
2-12
Instructions de r~emballage pour
expedition .......... ....
2-12
OPERATORS
PART-GERMAN
Kapitel2 BEDIENUNGSANLEITUNG
Seite
Einfiihrung
. . ...... . ..... . .....
.2-1
Installation and Auswechseln .... . .
2-1
Bedienungselemente and Stecker
. . . . 2-2
Darstellung and
Anzeige
der
Einheiten ... . ..... . ...... ...
2-2
Wahl der Betriebsarten
and Steuerfunktionen
.. ...... . ...
2-2
Eingang Kanal
A
and Pegelfunktionen
. . ..... . . .... 2-4
Signaleingang
.... .....: ...... . ....
2-4
Eingangsquellen ... . . .... . .....
.2-4
Eingangskoppelung ... .... . . ....
.2-4
Teiler
and
max . Eingangsspannungen . ..... .
.2-4
Empfindlichkeit and
Frequenzbereich . ...... . ...... .
.2-4
Flanke and Pegel
...... ....... .. .2-4
Einfiihrung in
die Bedienung ...... ...
2-5
Vorbereitung ... ...... . ..... . . . .
.2-5
B %J .
Uberpriifung
der Anzeige .... . ....
2-5
lJberpriifung der
LED-Segmente . . .
...... . .... .2-5
Frequenz-Darstellungen
A ...... 2-5
Periodendauer
B, Pulsbreite B
and Zeit
A -' B Darstellungen ... .
2-5
Ereignisse
A w~hrend B and
Verhilltnis A/B - Darstellungen
. . 2-6
Manuelle
Zeitdarstellung .... . . .2-6
Darstellung
SummeA . ...... . . .
2-6
Flanke Kanal A ...... ...... . ...
2-7
Flanke Kanal B ...... ...... . ...
2-7
Betriebsarten ... . ..... . ..... . . ...
.2-7
Allgemeines
. . . ...... ...... . ...
.2-7
Frequenz
A-Betrieb . . .... . . ......
2-7
Periodendauermessungen . . .....
.2-8
Zeitintervallmessungen ... . ...... .2-8
Ereignisse
A w~hrend B . . . ...... .
2-10
Verh~ltnismessung ..... . ...... .
.2-10
Manuelle Zeitmessungen
. ...... . . 2-11
Summierung A .. ....... ....... .. 2-12
Verpackung des
Ger~tes ... . ...... .. 2-12
OPERATORS
PART-JAPANESE
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TABLE OF
CONTENTS (cont)
Page
#'fll~I~
. . ..... . . ..... . ..... . ........................ . .......
~zT T
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F
. ..... . .... . . ........................ . .......
2
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.... . ...... .2-5
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. ..... . .
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... . ......... .p
- 5
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. ..... . .
2
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~T~
..... . .... . ................... . .......
2
_
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2
WARNING
THE FOLLOWING
SERVICING INSTRUCTIONS
AREFOR USE BYQUALIFIED PERSONNEL ONLY
.
T O AVOIDPERSONAL INJURY, DO NOT
PER-
FORMANYSERVICING OTHER THAN
THATCON-
TAINED IN OPERATING
INSTRUCTIONS UNLESS
YOU ARE
QUALIFIEDTO DOSO .
Section 3

THEORY OF
OPERATION

........

3-1
BLOCK DIAGRAM DESCRIPTION ... 3-1
Introduction . ................
3-1
Channel A and B
Amplifiers ..... 3-1
FREQUENCY A
(Variable Gate) ... 3-1
PERIOD
B (Variable Clock) ...... 3-1
PERIOD B
(Averageable - 100 ns
Clock)
............... . . .... 3-1
WIDTH B (Variable Clock)

. . . . . .
3-1
WIDTH B (Averageable - 100 ns
'

Clock) ................. .... 3-1
Section 3

THEORY OF
OPERATION (cont)
DC
503A
Page
TIME A
-
B (Variable Clock) .... .

3-2
TIME A
-
B (Averageable -
100 ns
Clock) . . ...................
3-2
EVENTS A DURING B (Averageable) 3-2
RATIO A/B (Averageable) .......
3-2
TOTALIZE A ................
3-2
TIME MANUAL
(Variable Clock) . . 3-2
Decade
Accumulators, 6_Decade
Counter/8-Decade Latch ... ..... 3-2
Measurement Cycle Timing ...... 3-2
Decimal Point and Annunicator
Encoder .... . . . ... ..... . .
3-2
Time Base . ....... ......... .
3-3
Power Supplies
....... ....... 3-3
DETAILEDCIRCUIT DESCRIPTION
Introduction ............. ....
3-3
CH A and CH
Amplifiers

~ O2

....... . . 3-3
Introduction to Signal
Routing 3O ......

.....
3-4
Time
A -- B Generator

. 3O

...

3-4
Signal Routin and Gate
Generator 3 . . ..........
3-4
N Circuit

~

...... .

.
3-7
Measurement Cycle Timin

. 5O

3-8
Decade
Accumulators

~

O7

3-9
ipple Through
.... ....... ... 3-9
Decimal Poi t and
Annunciator
Encoder ~ .......... ....
3-10
Display
O

.......... ....
3-10
Switching Logic (FUNCTION,
AVGS/TIMING)
O
...... . . 3-10
Time Base

10

......... .
3-11
Power Supplies

10

........ 3-11
6-Decade
Counter
Section 4 CALIBRATION ............ .....
4-1
Performance
Check Procedure . .... 4-1
Introduction
. . . .... ........ . . 4-1
Calibration Interval ....... .....
4-1
Services Available ....... .....
4-1
Test Equipment
Required ... .... 4-1
Time Base
Checks ........ .... 4-3

DC 503A
TABLE OF
CONTENTS (cont)
Page

Page
Section 4 CALIBRATION (cont)

Section 5 MAINTENANCE (cont)
CH A and CH
B Checks ..... ... 4-3

Circuit
Board Removal ........ . 5-5
Minimum Pulse Width Checks . . . .

4-7

Switch
Maintenance . ...... ....

5-5
Two Channel Function
Checks ... 4-10

Front Panel Latch Removal . . . ...
5-5
Trigger Level Checks
.......... 4-11

Rear Interface Information
..... ... 5-6
Rear Interface
Checks ......... 4-13

Functions
Available at Rear
Adjustment
Procedure . ..........
4-15

Connector .................. 5-6
Introduction
. . . .... ..........
4-15
Test
Equipment Required
....... 4-15

Section
6 OPTIONS
Preparation . ........ ... .....
4-15

OPtion 01
. . ................ 6-1
Section s MAINTENANCE
............ . . . .
5-1
General
Maintenance Information
. . . 5-1
Static-Sensitive Components
..... 5-1
Cleaning ...................
5-1
Obtaining
Replacement Parts ....
5-2
Soldering Techniques ..........
5-2
Semiconductors
.............. 5-3
Interconnecting
Pins . . .........
5-3
Square
Pin Assemblies . . .......
5-3
Circuit Board Pins and Ferrules
... 5-3
Dual Entry Circuit
Board Pin Sockets 5-4
Bottom Entry
Circuit Board Pin
Sockets
............ ........
5-4
Multipin
Connectors ....... ....
5-4
Section 7
REPLACEABLE ELECTRICAL
PARTS

7-1
Section 8 DIAGRAMS
AND ILLUSTRATIONS
Block Diagram
Adjustment Locations
Schematic Diagrams
Component Reference
Charts (Grid
Locators)
Section 9 REPLACEABLE
MECHANICAL PARTS 9-1
FIG . 1 EXPLODED VIEW
ACCESSORIES
CHANGE
INFORMATION

LIST OF
ILLUSTRATIONS
DC 503A
Fig .

Fig .
No .

Page
No .

Page
2-1

Plug-in
installation/removal ...... .... 2-1

5-1

Typical square
pin assembly . . . . ..... 5-3
2-2

Controls and connectors .......... . .

2-3

5-2

Exploded view of circuit board pin and
2-3

Triggering circuitresponsetoimproper(A)

ferrule .................. . ......

5-3
and proper (B) level settings ........ .

2-5

5-3

Dual entry
circuit board pin socket ....
5-4
2-4

Representation of interval
measurements

2-9

5-4

Bottom
entry circuit board pin socket

. . 5-4
2-5

Typical CH A and CH
B Level Out voltage

5-5

Orientation and disassembly of
multipin
settings for various time interval

connectors

......... ....... .....

5-4
measurements .................. . 2-10 5-6

Rear
frame removal

..... ...... ....

5-5
2-6

Illustration of CH A events
counted from
portion of CH
A signal pulses during the

5-7

Circuit board removal ....... ... . . . .
5-5
counter gate open time (controlled by the

5-8

Pushbutton switch removal
. ... ..... .

5-5
CH B signal) . . ..................
2-11

5-9

Rear interface connector
assignments . . 5-7
5-10

Rear interface
timing for a display of
3-1

Typical DC 503A
timing diagram ......

3-5

1079 .0674 .... ................ ..

5-8
4-1

Check set-up for the high
frequency
sensitivity
using X1 and X5 attenuation . . 4-4
4-2

Check set-up for lowfrequency ac and do
sensitivity . ...... . . ........... 4-6
4-3

Check set-up for minimum pulse width
signals .... ........ ............
4-8
4-4

Check set-up for two channel functions .

4-10
4-5

Check set-up
for trigger level range (±3 .5
V) and accuracy(±20 m V ±0 .5% of reading) 4-12
NOTE
The following
illustrations are found in the
foldout
pages
at the rear of this manual .
8-1

Main Board
(A15 Assy) Adjustment Locations
8-2

Auxiliary Board (A12 Assy)
Adjustment Locations
8-3

Auxiliary Board (A12
Assy) Parts Location
8-4

Main Board
(A14 Assy) Parts Location

LIST OF
TABLES
Table
No .

Page
1-1

Electrical Characteristics ........ ....

1-2
1-2

Miscellaneous .................. .
1-7
1-3

Environmental ................... 7-7
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
NOTE
The following fables
are found in the foldoui pages
at the rear of
this manual .
8-1
thru

Component Reference
Charts (Grid
8-10 Locators)

The general safety information
in this part of the summary

250 volts rms between the supply
conductors or between
is for both
operating and servicing personnel
. Specific

either supply conductor
and ground . A protective ground
warnings and cautions will be found
throughout the

connection by way of the groundingconductor
in the
manual where they apply,
but may not appear in
this

power cord is essential
for safe operation .
summary .
In This
Manual
OPERATORS SAFETY
SUMMARY
TERMS
CAUTION statements
identify conditions or practices that
could
result in damagetothe equipment or
other property .
WARNING statements identify conditions or
practices
that could result in personal
injury or loss of life .
As Marked on
Equipment
CAUTION indicates a personal
injury hazard not im-
mediately accessible
as one reads the marking, or
a
hazard
to property including the
equipment itself .
DANGER
indicates a personal injury
hazard immediately
accessible as one reads the marking
.
SYMBOLS
As Marked on Equipment
DANGER - High
voltage .
Protective ground (earth) terminal
.
ATTENTION - refer to manual
.
Grounding
the Product
This product is grounded through
the grounding conduc-
tor of the
power module power cord . To avoid
electrical
shock, plug the power cord into a
properly wired recep-
tacle before
connecting to the product input or
output
terminals . A protective ground
connection by way of the
groundingconductor in the power module
power cord is
essential for safe operation .
Danger Arising From Loss of
Ground
Upon loss of the protective-ground
connection, all
accessible conductive
parts (including knobs
and con-
trols
that may appear to be
insulating) can render an
electric shock .
Use the Proper Fuse
In This Manual

To avoid
fire hazard, use only the fuse of
correct type,
voltage rating and current rating as
specified in the parts
This symbol

indicates where applicable

list for your product .
I

cautionary
or other information is to be
found .

Refer fuse replacement to
qualified service personnel .
Do Not
Operate in Explosive Atmospheres
DC
503A
To avoid explosion, do
not operate this product in an
explosive
atmosphere unless it has been specifically
certified for such operation .
Do Not Operate
Without Covers
Power Source
To
avoid personal injury, do
not operate this product
This product is
intended to operate from a power
module

without covers or
panels installed . Do not apply
power to
connected to a power source
that will not apply morethan

the plug-in via a plug-in extender
.