Tektronix 71310 User manual

7eI~ronbc
Tektronix, Inc .
P
.O .
Box 500
Beaverton, Oregon

97077

Serial Number
COMMITTED TO EXCELLENCE
PLEASE CHECK
FOR CHANGE INFORMATION
ATTHE REAR OF THIS
MANUAL .
71310
TIME BASE
OPERATORS
INSTRUCTION MANUAL
070-2317-00

First Printing SEP 1978
Product Group 42

Revised OCT 1983

Normal
The NORMMODE provides a triggered
display with the
correct settings of the LEVEL control whenever an
adequate trigger signal is applied . The TRIG'D light
indicates when the display is triggered .
The normal trigger mode must be
used to produce
triggered displays with trigger repetition rates
below
about 30 hertz . When the TRIG'D light is off, no trace
is
displayed .
Single Sweep
When the signal to be displayed is not repetitive
or varies
in amplitude, waveshape, or repetition rate,
a
conventional repetitive type display may produce
an
unstable presentation . Under these circumstances, a
stable display can often be obtained by using the single-
sweep feature of this unit . The single-sweep mode is also
useful to photograph non-repetitive or unstable displays .
To obtain a single-sweep display of a repetitive signal,
first obtain the best possible display in the NORM MODE .
Then, without changing the other
TRIGGERING controls,
press the SINGLE SWP RESET button .
A single trace is
presented each time this button
is pressed
.
Further
sweeps cannot be presented until the SINGLE
SWP
RESET button is pressed again . If the displayed signal
is a
complex waveform composed of varying amplitude
pulses, successive single-sweep displays may not start at
the same point on the waveform .
To avoid confusion due
to the crt persistence, allow the
display to disappear
before pressing the SINGLE SWP RESET
button again . At
fast sweep rates, it may be difficult to view the single-
sweep display . The apparent trace intensity can
be
increased by reducing the ambient light level or by using
aviewing hood as recommended in the mainframe
instruction manual .
When using the
single-sweep mode to photograph
waveforms, the graticule may have
to be photographed
separately in the normal
manner to prevent over
exposing the film . Be sure the
camera system is well
protected against stray light, or operate the
system in a
darkened room . For repetitive waveforms,
press the
SINGLE SWP RESET button only once for each
waveform
unless the signal is completely symmetrical . Otherwise,
multiple waveforms may appear on the film . For
random
signals, the lens can be left open until the signal triggers
the unit . Further information
on photographic techniques
is given in the appropriate
camera instruction manual .
TRIGGERING COUPLING
The TRIGGERING
COUPLING push buttons select
the
method in which the trigger signal is connected
to the
trigger circuits . Each
position permits selection or
rejection of some frequency components
of the signal
which triggers the sweep .
AC
AC
COUPLING
blocks the do component of the trigger
signal .
Signals with low-frequency components
below
about 30 hertz are
attenuated . In general, AC COUPLING
AC LF REJ
AC
HF REJ
DC
TRIGGERING SOURCE
Internal
Line
Operating Instructions-7B10 Operators
can be used for most applications . However, if the signal
contains unwanted frequency
components or if the
sweep
is to be
triggered
at a low repetition rate or do
level, one of the other
COUPLING switch positions will
provide a better display .
AC LF
REJ
COUPLING rejects dc, and attenuates low-
frequency trigger
signals below about 50 kilohertz .
Therefore, the sweep
is
triggered
only by the higher-
frequency components of the trigger
signal . This position
is particularly useful for providing
stable triggering if the
trigger signal contains line-frequency
components . Also,
the AC LF REJ position provides the
best alternate-mode
vertical displays at fast sweep rates when
comparing two
or more unrelated signals .
AC HF REJ COUPLING passes all
low-frequency signals
between about 30 hertz and 30 kilohertz . Dc
is rejected
and signals outside the above range
are attenuated .
When triggering from complex waveforms,
this position
is useful to provide a stable display of the
low-frequency
components .
DC COUPLING can be used
to provide stable triggering
from low-frequency signals which
would be attenuated
in the other COUPLING switch positions .
DC COUPLING
can be used to trigger the sweep when
the
trigger
signal
reaches a do level set by the LEVEL control .
When using
internal triggering, the setting of the vertical unit
position
control affects the triggering point .
The TRIGGERING SOURCE push
buttons select the
source of the trigger signal which
is connected to the
trigger circuits .
The INT position connects
the
trigger
signal from the
vertical plug-in unit .
Further selection of the internal
trigger signal may be provided by the
vertical plug-in unit
or by the mainframe ; see the instruction
manuals for
these instruments for more
information . For most
applications, the internal source can be used .
However,
some applications require special triggering
which
cannot
be obtained in the INT position . In such
cases, the
LINE or EXT
positions of the SOURCE switches
must be
used .
The LINE position connects a
sample of the power-line
voltage from the mainframe
to the trigger circuit . Line
triggering is useful when the input
signal is time-related
(multiple or submultiple) to the line frequency
. It is also
useful for providing a stable display of a
line-frequency
component in
a complex waveform .
2- 5

COMMITTED TO EXCELLENCE
P~.EA E CH

K ~`

~HAN~

INF'tJRMATlt3
ATTHE DEAR 4I' THIS MANI~AL .
I N

`T~ F~ l_J

~` I CJ N

M .~,N hJ A L
Tektronix, Inc .
P .O . Box 500
Beaverton, Oregon

97077

Serial
Number .__

~_
070-2316-00

First
Printing SEP 1978
Product Group 42

-vi
;~ed JAN 1983

REVSEP
198 2
TB10 Instruction
PAGE

PAGE
LIST OF ILLUSTRATIONS
........................,,..,. . , , ,
iii

SECTION 3 THEORY OF OPERATION
LIST
OF TABLES . . . . . . . . ........,........,,,,.,,,,,,,, , , 
iii

BLOCK DIAGRAM DESCRIPTION .............. .,......
3-1
OPERATORS SAFETY
SUMMARY .............,,. , , , , . . , ,.,
iv

TRIGGER GENERATOR .............. . . . . , . . , ,,.,,,,
3-1
SERVICING SAFETY SUMMARY .................. , . , , . , . , ,
, ,
v

SWEEP
GENERATOR

................ . . . , .,,,...,.,

3-1
LOGIC
..............................
. .............
3-1
DETAILED CIRCUIT DESCRIPT~ON ...... . ............,.
3-1
LOGIC FUNDAMENTALS ... . . . . . . . .................
3-1
SYMBOLS
........
. . . . . . . . . . ...................
. 3-1
SECTION 1 GENERAL INFORMATION

LOGICPOLARITY ........... . . . . ...,,,.,,,,,,,,,
3-1
INI~RODUCTION .............................. . . . . .... 1-1

INPUT/OUTPUT
TABLES . . . .................. . . . .
3-2
OPERATORS MANUAL .................. . . . . . . . . ... 1-1

NON-DIGITAL DEVICES
. . . .................... ., . . . 3-2
INSTRUCTION MANUAL
....................... . . . . . 1-1

FRONT-PANEL WIRING
..................... . . . . . . .
3-6
INSTALLATION
............................
. . .
. . . ..... 1-1

TRIGGER GENERATOR ...................... . , , ....
3-6
SPECIFICATION ............... . . . . . . .......,,.,.,,,,,
1-2

EXTERNAL TRIGGER AMPLIFIER .......... . . . ....
3-6
STANDARD ACCESSORIES
....... . . . . . ............... 1-4

TRIGGER AMPLIFIER AND SOURCE
SELECTOR ... 3-6
SLOPESELECTOR AND TRIGGER
GENERATOR ... 3-6
GATE GENERATOR ................ . . . ....,...,.
3-7
LOGIC ............................ . .
...........:.. 3-7
TRIGGER
MODE SWITCHING . . . . . . . .............
3-8
HOLD OFF TIMING ......... . . . . ...............,.
3-8
SECTION 2
OPERATING INSTRUCTIONS

LOCKOUT BUFFER
AMPLIFIER ...................
3-8
CONTROLS, CONNECTORS,
AND INDICATORS .........
2-1

HOLD OFF OUTPUT
AMPLIFIER . . ..............,.
3-8
OPERATORS CHECKOUT . . . . .
..............,.,....,,, 2-1

SWEEP GENERATOR . ..............,,,....,,,,, ,,.
3-8
SETUP PROCEDURE .....................,,.,.,,,,,
2-1

TIMING CURRENT SOURCE ................... ...
3-8
SWEEP FUNCTIONS . . . . .......................,,,.
2-1

RAMP
GENERATOR .................,..,.. .,, , , ,
3-9
TRIGGERING FUNCTIONS .................... . . , , .
. 2-4

OUTPUT PREAMPLIFIER .............,..,.,..,._,
3-9
DETAILED OPERATING INFORMATION ........... . . . . .
. 2-4

AUXILIARY
SWEEP PREAMPLIFIER ......... ......
3-9
TRIGGERING SWITCH LOGIC ........... . . . . . .......
2-4

SWEEP GATE GENERATOR
............. ......... 3-9
TRIGGERING MODE ....................., , . , , . .,,,
2-4

TIME/DIVISION AND
READOUT SWITCHING ........
3-9
TRIGGERING
COUPLING ............ . . . . . ..........
2-5

BASIC READOUT SYSTEM .......... . .......,....
3-9
TRIGGERING
SOURCE ........... . . . . .............. 2-5

INTERFACE CONNECTORS AND
POWER SUPPLY ... 3-10
TRIGGERING SLOPE ............. . . . . . ........,,.,,
2-7
TRIGGERING
LEVEL ....... . . . . . ............,...,,, 2-7
HORIZONTAL SWEEP
RATES . . .....................
2-7
TIME MEASUREMENTS
. . . . . . . . . ............... 
2-7
SWEEP MAGNIFICATION . . . . . . .................,.,,
2-8

SECTION 4 MAINTENANCE
VARIABLE HOLD OFF . ....................,.. , . , . , ,
2-8

PREVENTATIVE MAINTENANCE ................. .....,
4-1
MAINFRAME OPERATING MODES ......... . . . . . . . . .
2-8

CLEANING
. . . . . ....................,........ . ..... 4-1
APPLICATIONS . . . . .
. . . ......................... . .
. . . . 2-8

EXTERIOR . . . . . . .......................... ......
4-1
TIME-INTERVAL
MEASUREMENTS ............... . . . . .
2-8

INTERIOR .............................. . ........
4-1
PERIOD AND
FREQUENCY MEASUREMENTS ........
2-8

SWITCH CONTACTS ................ . ............
4-1
RISE-TIME AND FALL-TIME
MEASUREMENTS .......
2-9

VISUAL INSPECTION ...................... . . .......
4-1
PULSE WIDTH MEASUREMENTS
. . . . . . ............ 2-10

LUBRICATION ......................... .......... .,
4-1
DELAYED-SWEEP MEASUREMENTS
. . . . . . ............ 2-11

CAM SWITCH LUBRICATION ............ ......... 4-2
SEMICONDUCTOR
CHECKS ............ ............ 4-2
ADJUSTMENT AFTER REPAIR ....... ... ............ 4-2
TROUBLESHOOTING
.................,... .......,.,,, 4-2
TROUBLESHOOTING
AIDS ....... . . . ............... 4-2
DIAGRAMS ...................... ...............
4-2
L ._ .__ .___ ._____ .___ . ._ ., ._u-

VOLTAGES AND WAVEFORMS
. . . . .............. 4-2
We4RNING
TROUBLESHOOTINGCHART . . . . . . ..............,
4-2
CIRCUIT-BOARD ILLUSTRATIONS
. . .............. 4-4
SWITCH
IDENTIFICATION ...................... . . 4-4
THE REMAINING PORTION
OF THIS TABLE
OF

DIODE COLOR
CODE . . . . ...................... . . 4-4
CONTENTS LISTS THE SERVICING
INSTRUCTIONS .

WIRING COLOR
CODE ..................... . . . . . 4-4
THESE SERVICING INSTRUCTIONS
ARE FOR USE

SEMICONDUCTOR BASING
................. . . ... 4-4
BY
QUALIFIED

PERSONNEL ONLY .
T O AVOID

INTER-BOARD PIN
CONNECTOR IDENTIFICATION . 4-4
ELECTRICAL
SHOCK, DO NOT PERFORM
ANY

MULTI-PIN CONNECT"OR
IDENTIFICATION . . . ..... 4-4
SERVICING
OTHER THAN THAT CALLED
OUT IN

INTERFACE CONNECTOR PIN
LOCATIONS . . . ..... 4-5
THE

OPERATING

INSTRUCTIONS

UNLESS

ADJUSTMENT AND PERFORMANCE
CHECK . . . ... 4-5
QUALIFIED
TO DO SO .

TROUBLESHOOTING EQUIPMENT ........ . . . .....
4-5

7810 Instruction
TROUBLESHOOTING TECHNIQUES . . . . . . . . . ........ 4-5

PART I--PERFORMANCE CHECK ...................... 5-7
1 . CHECK CONTROL
SETTINGS . . . . .............. 4-5

PERFORMANCE CHECKPROCEDURE INDEX ........ 5-7
2
. CHECK ASSOCIATED EQUIPMENT ............,
4-6

PERFORMANCE CHECK POWER-UPSEQUENCE ..... 5-7
3 . VISUAL CHECK . . . . . . . ..... . . . . . . . . .........,.
4-6

A . TRIGGERING SYSTEM ........................... 5-8
4 . CHECK INSTRUMENT ADJUSTMENT ...........
4-6

B . HORIZONTAL SYSTEM ......................... 5-12
5 . ISOLATE TROUBLE
TOA CIRCUIT ............. 4-6

PART II--ADJUSTMENT
AND
PERFORMANCE CHECK . 5-16
6 . CHECK VOLTAGES AND WAVEFORMS
........ 4-6

ADJUSTMENT AND PERFORMANCE CHECK
7 . CHECK INDIVIDUAL COMPONENTS ............ 4-6

PROCEDURE
INDEX ............... . . . . . .... . . . . . . .
5-16
8 . REPAIR AND ADJUSTMENT ................... 4-7

ADJUSTMENT AND PERFORMANCE CHECK
CORRECTIVE MAINTENANCE ..............,,....,..,, 4-7

POWER-UP SEQUENCE ........... . . . . . . . . . . . . . . . . 5-16
OBTAINING
REPLACEMENT PARTS ................. 4-7

A . TRIGGERING SYSTEM ..................... . . . . . 5-17
SOLDERING TECHNIQUES ......................... 4-7

B . HORIZONTAL SYSTEM .....................,,.. 5-22
COMPONENT REMOVAL AND REPLACEMENT
....... 4-8
CIRCUIT BOARDS ............................... 4-8
SWITCHES .................................... 4-10
SEMICONDUCTORS ............................ 4-13
HYPCON CONNECTORS ........................ 4-13

SECTION 6 INSTRUMENT OPTIONS
INTERCONNECTING PINS ....................... 4-16
CIRCUIT-BOARD PINS .......................... 4-17
FRONT-PANEL LIGHTS ......................... 4-17
ADJUSTMENT AFTER REPAIR ..................... 4-18

SECTION 7 REPLACEABLE ELECTRICAL PARTS
INSTRUMENT REPACKAGING ..................... 4-18
SECTION 5 CALIBRATION

SECTION 8 DIAGRAMS AND CIRCUIT BOARD
ILLUSTRATIONS
CALIBRATION . . . . .... . . . . . . . . ..... . ..... . . . ... . . . . . . . 5-1
PRELIMINARY INFORMATION ............ . . . . . .,,. , 5-1
USING THESE PROCEDURES . . . . . . . ... . . . . . . . . . . 5-1
ADJUSTMENT
INTERVAL
. . . . . . . .... . . . . . . . . . . . . . 5-2

SECTION 9 REPLACEABLE MECHANICAL PARTS
TEKTRONIX
FIELD SERVICE .... . .... . . . . . . . . ..... 5-2
TEST EQUIPMENT REQUIRED . . . . ..... . . . . . . . . . . . . . 5-5
SPECIAL FIXTURES . . . . . . . . . . ...... . . , . . .....,,.
5-5
TEST EQUIPMENT ALTERNATIVES
. . . . .
.
.
. . . .....
5-5

CHANGE
INFORMATION

I L

~I
7B10
Instruction
FIGURE

FIGURE
NO .

PAGE
NO .

PAGE
Fronds-

4-7

Coaxial end-lead connector
assembly
...........
4-10
piece

.... . . . . . . . . . . . . . . .................
vi

q_g

Cam switch removal procedure ................
4-11
1-1

Location of release latch . . . . . . . . . . . . ............ 1-1

4-g

Removal procedure for typical push-button
1-2

7810
dimensional drawing ..... . ...............
1-4

switch .......................................
4-12
2-1

Front-panel controls, connectors, and

4-10

Hypcon connector removal and replacement .... 4-14
indicators ... . . . . . . . . . . . . . . . . . . . ............... 2-2

4_11

Exploded view of circuit-board pin and ferrule . . . 4-17
2-2

Effect of LEVEL control and SLOPE switch on

4-12

Front- anel li ht socket assembl
crt display .....................................
2-6 P

9

y ....... . . . . . . . 4-17
2-3

Area of graticule used for most accurate time
measurements ....................... ......... 2-7

The illustrations in section 8 are located near their associated
2-4

Operation of sweep magnifier . . . . ............... 2-8

diagrams on the foldout page .
2-5

Measuring the period and determing the
frequency of a displayed waveform .............. 2-9
2-6

Measuring the rise time and fall time of a

8-1

Semiconductor lead configurations .
displayed waveform ...... . . . . ................. 2-10

8-2

Location of circuit boards in the 7810 .
2-7

Measuring the pulse width of a displayed

8-3

A1-Interface circuit board assembly .
waveform .................................... 2-10

8-4

A2-Trigger circuit board assembly .
3-1

Basic block diagram
of the 7810 Time Base

8-5

A3-Readout circuit board assembly .
unit
........................................... 3-2

8-6

A1-Interface circuit board assembly .
3-2

Timing diagram for Gate Generator stages

8-7

A2-Trigqer circuit board assembly .
0160, 0164, and 0174 . . . . . . . . ................
3-7

8-8

A3-Readout circuit board assembly .
4-1

Lubrication procedure for a
typical cam switch ... 4-2

8-9

Location of Sweep Timing adjustments .
8-10

Location of Triggering adjustments .
4-2

Semiconductor lead configuration ...............
4-3
4-3

Inter-board multi-pin connector assembly ........ 4-4
4-4

End-lead multi-pin connector assembly .......... 4-5
4-5

Location of pin numbers on Interface connector . . 4-5
4-6

Readout board removal procedure ............... 4-9
TABLE
NO .

PAGE
1-1

Electrical Characteristics
. . . . . . . . . . ............. 1-2
1-2

Environmental
Characteristics . . ................ 1-4
1-3

Physical
Characteristics ........................ 1-4
3-1

Basic Logic Reference
.......................... 3-3
3-2

Readout Character Selection ................... 3-10
5-1

Performance Check Summary ................., .
5-2
5-2

Test Equipment ............................. . . .
5-5
5-3

Sweep Timing ................................
5-14
5-4

Magnified Sweep timing .......................
5-15
5-5

Sweep Timing ................................ 5-25
5-6

Magnified Sweep Timing ...................... 5-26
REVJUN 198 1

III

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REV SEP 1982
INTRODUCTION
OPPRATORS MANUAL
INSTRUCTION
MANUAL
INSTALLATION
The Operators Manual contains information
necessary to
effectively
operate the 7B10 Time Base and
is divided
into three sections
: Section 1 provides a basic
description
of the 7810
with instrument specifications
and
accessories, section 2
contains operating information
for
the instrument, Instrument Option
information is located
in section 3 of the manual .
The
Instruction Manual
provides both
operating
and
servicing
information for
the 7810
Time Base .
The
Instruction
Manual is divided
into
nine sections
.
Operating
information is covered
in the first
two sections
;
servicing information
for
use by
qualified service
personnel is contained
in the
remaining seven
sections
of the
manual .
Schematic diagrams
are located
at the
rear of the
manual and
can be unfolded
for
reference
while reading
other parts
of the manual .
The reference
designators and
symbols
used on the
schematics are
defined on the first
page of
the Diagrams
and Circuit
Board Illustrations
section . All
abbreviations
used in this
manual,
with the
exception
of the parts
list and
schematic
diagrams,
comply with
the American
National
Institute Y1 .1-1972
publication .
The parts
lists are
computer
printouts
and use
computer-supplied
abbreviations
. Instrument Option
information is
located
in section 6
of the Instruction
Manual .
To install
the unit in a plug-in
compartment, push
it in
until it
fits firmly into the
compartment . The
front panel
of the unit
should be flush
with the front panel
of the
mainframe
. Even though the
gain of the mainframe
is
standardized,
the sweep calibration
of the unit
should be
checked when
installed . The
procedure for checking the
unit
is given under
Sweep Functions
in the
Operators
Checkout procedure
in section 2 .
To remove the unit,
pull the release latch (see Fig . 1-1 ~
to
disengage the unit from the
mainframe, and pull it
out of
the plug-in compartment .
I'
I'
I,
I
I
I .
I,
I
I
I
I
f
I
I
I
I
I
i
fG 9
Ifo~o
GOSITION

\

~
P

~~

OFF
MPG
The time-base
unit is designed
to operate in the

T
horizontal
plug-in compartment of
the mainframe . This

RELEASE
LATCH

p
s58-31z3t 7-z
instrument
can also be installed
in a vertical plug-in

__
compartment
to provide a vertical
sweep on the
crt .
However,
when used in this manner,
there are no
internal triggering or
retrace blanking provisions,
and the
unit may not meet specifications
.

Fig . 1-1 .
Location of release latch .
TNIGGEgING
MODf COUPONG SOONCf
TIME/DIV
Section 1-7810

070-2318-00
Product Group 42
IN
Tektronix,
Inc .
P
.O . Box 500
Beaverton, Oregon

97077

Serial Number ___
COMMI1`T"ED TO
EXCELLENCE
K

CHANGE
INFORMATION
2 OF THIS MANUAL .
N MANUAL
First
Printing OCT 1978
Revised APR 1984

T
L
PAGE
LIST OF
ILLUSTRATIONS ................ ... iii
LIST OF TABLES
... ................. ...... iv
SAFETY SUMMARY . ............... ........ .
v
SECTION 1 OPERATING INSTRUCTIONS
INSTALLATION . . . . ............... 1-1
CONTROLS, CONNECTORS,
AND INDICATORS . . ... . ............ 1-1
FUNCTIONAL CHECK . .............. 1-1
Setup Procedure . . . . . . ............ 1-1
Sweep Functions . . ................ 1-4
Triggering Functions . .............. 1-4
GENERAL OPERATING INFORMATION . . 1-5
Triggering Switch Logic ............. 1-5
Triggering Modes ............... . . . 1-5
Trigger Coupling ... ............... 1-6
Trigger Source ................ . . . 1-6
C
WARNING
NT
'THE
REMAINING SECTIONS OF THIS MANUAL CONTAIN SER-
VICING INSTRUCTIONS .
THESE SERVICINGINSTRUCTIONS
ARE
FOR
USE
BY QUALIFIED PERSONNEL ONLY . T O AVOID
ELECTRICAL SHOCK,
DO NOT PERFORM ANY SERVICING
OTHER THAN THAT CALLED OUT IN THE OPERATING
IN-
STRUCTIONS UNLESS QUALIFIED TODOSO .
7B50A Instruction
PAGE
Trigger Slope .................... 1-7
Trigger Level .................... 1-7
Horizontal Sweep Rates ............. 1-7
Time Measurement .............. . . 1-7
Sweep Magnification ...............
1-7
Variable Hold Off ................. 1-7
Mainframe Operating Modes .......... 1-9
APPLICATIONS ........................ 1-10
TIME-INTERVAL
MEASUREMENTS ... . .
1-10
Period and Frequency
Measurements
..... 1-10
Rise-Time and Fall-Time
Measurements
. . .
1-11
Pulse Width Measurements
. . . . . . . . . ..
1-12
DELAYED-SWEEP MEASUREMENTS . . . . .1-12
X-Y PHASE MEASUREMENTS . . . . . . . . . . 1-12
SECTION 2 SPECIFICATION
STANDARD ACCESSORIES . . .... . . . . . 2-3

7B50A Instruction
SECTION 3 THEORY
OF OPERATION
TABLE OF C
BLOCK DIAGRAM
DESCRIPTION ... . . . . .... 3-1
DETAILED CIRCUIT DESCRIPTION
. . ... . . . . 3-1
LOGIC
FUNDAMENTALS .......... .
. .
3-1
NON-DIGITAL DEVICES
............. . 3-2
FRONT-PANEL DISTRIBUTION

1O ..... 3-7
TRIGGER GENERATOR
O
.......... 3-7
LOGIC
0
.... .
... . . . ............ 3-9
SWEEP GENERATOR O . . . . .......
.3-11
TIME/DIVISION READOUT
O
. . . .... .3-14
INTERFACE CONNECTORS AND
POWER SUPPLY

/,~, ...... ..
. ......
3-14
PAGE
SECTION 4
MAINTENANCE
PREVENTIVE MAINTENANCE .......
. . . ... 4-1
CLEANING . ...................
. . .
4-1
VISUAL INSPECTION ............. . ..
4-1
LUBRICATION
. ................... 4-1
SEMICONDUCTOR
CHECKS . .......... 4-2
ADJUSTMENT
AFTER REPAIR ...
.
...... 4-2
TROUBLESHOOTING
. . .
..
... ............ 4-3
TROUBLESHOOTING AIDS
. .......... 4-3
TROUBLESHOOTING
EQUIPMENT . ..... 4-5
TROUBLESHOOTING
TECHNIQUES . .... 4-6
CORRECTIVE MAINTENANCE .. .
. . . . . . .... 4-9
OBTAINING
REPLACEMENT PARTS . .... 4-9
VENTS (CONT
.)
PAGE
SOLDERING
TECHNIQUES . ...........
4-9
COMPONENT REMOVAL AND
REPLACEMENT . . . . . . . . . . . . . . . . . ... 4-10
Circuit Boards ..... . . . . . . . . . ...... 4-10
Switches

....... . . . . .... . . . . . . . . 4-12
Semiconductors

.... . . . . . . . . . . . . . . 4-12
Interconnecting Pins

. . ..... . . . . . . . . 4-13
Front-Panel Lights ....... . ..... . . . . 4-16
ADJUSTMENT
AFTER REPAIR ......... 4-16
INSTRUMENT
REPACKAGING ......... 4-16
SECTION5 PERFORMANCE
CHECK AND
ADJUSTMENT
PRELIMINARY INFORMATION
........ 5-1
TEST
EQUIPMENT REQUIRED ......... 5-1
INDEX - I - O PERFORMANCE
CHECK
AND ADJUSTMENT
PROCEDURE . ...... 5-3
PRELIMINARY PROCEDURE . . . . . .
.... 5-3
SECTION
6 REPLACEABLE ELECTRICAL PARTS
SECTION
7 INSTRUMENT OPTIONS
SECTION
8 DIAGRAMS AND CIRCUIT BOARD
I LLUS
rRATIONS
SECTION
9 REPLACEABLE MECHANICAL PARTS
CHANGE
INFORMATION

FIGURE
NO .
Frontispiece . . . . . ... . ............. vi
1-1

Location of release latch . . ........... 1-1
1-2

Front-panel controls, connectors,
and indicators ........ ............ 1-2
1-3

Effect of LEVEL control and SLOPE
switch on crt display . . . .. .......... 1-8
1-4

Area of graticule used for most accurate
time
measurements ........ ........ 1-9
1-5

Operation of sweep magnifier
... ...... 1-9
1-6

Measuring the period
and determining
the
frequency of a displayed waveform . . .1-10
1-7

Measuring the rise time and
fall time of
a displayed waveform ........... . . . .1-11
1-8

Measuringthe pulse width of a displayed
waveform
.................
. . . . . .1-12
2-1

7B50A
dimensional drawing ...... . . . . 2-3
3-1

Basic block diagram of the 7B50A
Time-Base Unit ............... . . . .
3-2

Detailed block diagram of Trigger
Generator .................... ..
3-3

Functional diagram of Trigger Source
Selector . . ..................... .
3-4

Timing
diagram for Gate Generator
(Q92,
096,Q98) . .................
3-5

Detailed block
diagram of Logic circuit . .
.33-6

Detailed block diagram of Sweep
Generator . . ... ................
.34-1

Lubrication procedure for a typical
cam switch
. . . . ..................
4-2

Semiconductor
lead configuration ......
4-3

Inter-board multi-pin
connector
assembly ....... . . ..............
4-4

End-lead multi-pin connector
assembly ....... . . . . . ...........
LIST OF ILLUST
FIGURE
PAGE NO .
i
N
7B50A Instruction
4-5

Location of pin numbers
on Interface
connector ......................
4-5
4-6

7B50A troubleshooting
chart ..........
4-8
4-7

Readout board removal procedure ..... .4-11
4-8

Coaxial end-lead connector assembly .... .4-12
4-9

Cam switch removal procedure ........
.4-14
4-10

Removal procedure for
typical
push-button switch

................ 4-15
4-11

Exploded view of circuit-board pin
and ferrule . . ... . . . ............. .4-16
4-12

Front-panel light socket assembly . . .... .4-16
The illustrations in Section
8
are
located near their associat-
ed Diagrams on the foldout
pages .
PAG E
3-2
8-1 Semiconductor lead configurations .
8-2
Location of circuit boards in the 7B50A .
3-6 8-3
A1-Interface circuit board assembly .
8-4 A2-Trigger
circuit board assembly .
3-8 8-5
A3-Readout circuit board assembly .
8-6 A1---Interface
circuit board assembly .
3-9 8-7
A2 Trigger
circuit board assembly .
-10 8-8
A1-Interface
circuit board assembly .
8-9 A1-Interface circuit
board assembly .
-12
8-10 A3--Readout circuit board assembly .
8-11 A1--Interface circuit
board assembly .
4-2
8-12
A3-Readout circuit board assembly .
4-4
8-13 A1-Interface
circuit board assembly .
8-14 A5-X-Y Switch
circuit board assembly .
4-5
8-15 Location of Sweep Timing adjustments .
8-16 Location of Triggering adjustments
.
4-5

7B50A Instruction
LIST
TABLE
NO . PAGE TABLE NO . PAGE
2-1 Electrical Characteristics
.............
2-1
3-2 Readout
Character Selection
......... .3-15
2-2 Environmental Characteristics ......... 2-3
5-1 Test Equipment .................. 5-2
2-3 Physical Characteristics .............. 2-3 5-2
Sweep Timing .................... 5-10
3-1 Basic
Logic
Reference .............. 3-3 5-3
Magnified Sweep Timing ......... . ... 5-10

7B50A, 7B80 & 7B85

M31882

10-20-77
PRODUCT

CHANGE REFERENCE

DATE
CHANGE :
DESCRIPTION
SCHEMATIC CORRECTIONS
DIAGRAM <2) TRIGGER GENERATOR - Partial
i
Ra3
T5
C .R?-
4

( : - :- o
.~6
PAGE 2
OF 2
+5 V
4

SECTION 1
SECTION2
Type
71351
SPECIFICATION
Page
Introduction
1-1
Electrical Characteristics
1-1
Sweep Rate
1-1
Sweep Accuracy
1-1
Sweep Length
1-1
Sweep Hold-Off Time
1-1
Delay Time Multiplier
1-1
Range
1-1
Accuracy
1-1
Linearity
1-2
Delay Jitter
1-2
Trigger Sensitivity
1-2
Internal Trigger Jitter
1-2
External
Trigger Input 1-2
Level Range
1-2
Bright
Baseline
1-2
P-P Auto
Sensitivity
1-2
Environmental
Characteristics 1-2
Altitude
1-2
Transportation
1-2
Physical Characteristics
1-2
Finish
1-2
Weight
1-2
Dimensions
1-2
OPERATING
INSTRUCTIONS
General 2-1
Installation
2-1
Front Panel Controls
and Connectors 2-1
Test Setup Chart 2-4
General Operating
Information 2-4
Sweep Calibration Check 2-4
Simplified Operating Instructions 2-g
Normal Sweep 2-g
Magnified
Sweep
2-g
Delayed
Sweep
2_g
Pushbutton Switch
Logic
2-g
Triggered Light 2-7
Trigger Mode 2-7
Trigger
Coupling 2-g
Trigger
Source
2-10
Trigger
Slope 2-10
Trigger Level
2-10
Horizontal
Sweep Rate 2-10
Sweep Magnifier
2-12
Horizontal Position
Control
2-12
Applications
2-13
Measurement
Techniques
2-13
Time
Duration Measurements
2-14

Type 71351
SECTION 3
SECTION 4
N

~ ``
`r

c

rr°t
Determining Frequency
2-14
Risetime Measurements
2-15
Delayed Sweep Time
Measurements 2-16
Delayed Sweep
Magnification 2-17
Pulse Jitter
Measurements 2-18
CIRCUIT DESCRIPTION
Introduction 3-1
Block Diagram Description 3-1
Detailed Circuit Description 3-3
Trigger
Preampand Input Switching 3-3
Trigger Generator 3-3
Input Stage 3-3
P-P Auto Stage 3-3
Slope Comparator 3-3
Trigger TD Stage 3-6
Pulse Amplifier 3-6
Sweep Gate Stage 3-7
Bright Line Auto 3-7
Sweep Generator
3-7
Disconnect Amplifier
3-7
Sawtooth Generator
3-9
Sweep Start Amplifier
3-9
Sweep Stop Comparator
3-9
Holdoff Capacitor and Amplifier
3-9
Sweep Holdoff Multivibrator 3-9
Reset Control Amplifier 3-10
Sweep Reset Multivibrator 3-10
Single Sweep Operation 3-10
Alternate Operation
3-10
Delayed Sweep Operation
3-10
Delay Pickoff Circuit 3-11
Horizontal
Preamp 3-11
Readout Block 3-12
MAINTENANCE
Preventive Maintenance
4-1
General
4-1
Cleaning
4-1
Transistor Checks
4-1
Recalibration
4-1
Troubleshooting
4-2
Troubleshooting Aids
4-2
Troubleshooting Equipment
4-2
Troubleshooting
Techniques 4-2
Corrective
Maintenance 4-6
Obtaining Replacement
Parts 4-6
Soldering
Techniques 4-7
Component Replacement 4-7

AT" cont
Abbreviations and symbols used in this manual are based on or taken directly from IEEE
Standard 260
"Standard Symbols for Units", MIL STD-1213 and other standards of the
electronics industry . Change
information,
if
any, is located at the rear of this manual .
Type 71351
SECTION5
PERFORMANCE CHECK/CALIBRATION
5-1
Introduction 5-1
Test Equipment
Required 5-1
Short Form Procedure
5-2
Performance Check/Calibration
Procedure 5-4
General
5-4
Preliminary Control Settings
5-4
Check or
Adjust
Level Center
5-4
P-P Auto Level Range
5-5
Internal Trigger
Centering 5-6
Level/Slope
Range 5-6
Trigger Bandwidth 5-6
External Trigger Input Compensation 5-6
Sweep
Jitter
5-7
Trigger
Modes 5-7
Sweep
Calibration
5-8
Magnified Sweep Gain 5-8
Magnifier Registration
5-9
Sweep Length 5-9
Variable Time/Div Range 5-9
5 its Timing 5-10
0 .2 ps Timing
5-10
Sweep Timing
Accuracy 5-10
Magnified
Sweep Timing 5-10
Sweep
Inhibit
5-11
Delay Start (13590)
and
Delay Stop
(13500) 5-12
Delay Time Accuracy
5-13
Delay Time Jitter
5-13
Line Trigger
Source 5-14
SECTION 6 ELECTRICAL PARTS LIST
Abbreviations and Symbols
Parts Ordering Information
Index of Electrical Parts List
SECTION 7 DIAGRAMS AND
MECHANICAL PARTS ILLUSTRATIONS
Diagrams
Mechanical Parts Illustrations (on
reverse side of Diagrams)
SECTION 8 MECHANICAL PARTS LIST
Mechanical Parts List Information
Index of Mechanical Parts Illustrations
Mechanical Parts List
Accessories

Type
7851
TRIGGERING
MODE
COUPUNO SOURCE
P-P
AUTO 
AC

INT
Fig
.
1-1
.
Type 7851 Delaying Time-Base
.

Maintenance-Type 7851
Insert the Type 71351 and a vertical plug-in unit into
a calibrated oscilloscope . Turn,the
power on and
allow a few minutes warm-up . Check that all push-
buttons will light when pressed .
Set horizontal and vertical POSITION controls to
midrange, press the top TRIGGERING buttons, set
the TIME/DIV to .5 ms, MAGNIFIER to X1, and
vertical VOLTS/DIV to 10 mV . Advance the Inten-
sity until a free-running trace is observed .
R o tate the horizontal POSITION control through-
Lout its range . Check for movement of trace .
Set the oscilloscope Calibrator to 1 kHz and 40 mV .
Connect the Calibrator output to the vertical unit .
Check for about 5 complete cycles/10 divisions .
Set t he TIME/DIV to 5 ms and press the X10
MAG-
NIFIER button
.
Check for about 5 complete
cyc
l
es/10 divisions .
moves along the trace .
4-4
W
yes
button and repeat the above check .
yes
Insert the Type 71351 into the left (A) horizontal
compartment and the companion time-base into the
right (B) horizontal compartment . Set the oscillo-
scope horizontal mode to A . Set the Type 71351
TIME/DIV to
.5 ms and press the B STARTS
AFTERDELAY pushbutton .
Set the B time-base
TIME/DIV to .1 ms . Check for an intensified por-
NOTE : An Indicator Oscillo-
scope having two hori-
zontal plug-in compart
ments is required for the
following checks .
Rotate the DELAY TIME MULTIPLIER through-
out its range . Check that the intensified portion
Press the B TRIGGERABLE AFTER DELAY push-
buttons do
not light
trace does
not appear
trace does
no
no
Fig . 4-2 .
Troubleshooting chart for the Type 71351 .
Check at +5 volt test point
for +5 volts . Check push-
button light
bulbs .
Remove vertical unit
from
indicator oscilloscope .
Check for free-running
trace .
Check horizontal pre-amp .
Check that VARIABLE
TIME/DIV is set to CAL
IN (pushed
in)
.
yes
Check hors
zontal pre
amp . Check
rel ay K780-',
Check delay
comparator,
delay multivibrator and de-
lay output emitter-
follower . Check delay con-
trol (TP 490) for +4 .5
outputs present
See instruction
manual for indicator
oscilloscope and B
j time-base .
Check DELAY
no

TIME MULTI-
PLIER potentio-
meter . Check delay
comparator .
no trace
trace appears
Check delay control
(TP 490) for
about
+3 volts . Check
switch S490B .

Check Type 7851
control settings
(triggering
MODE
must be P-P
AUTO
or AUTO
. Check
sweep output .
output
Check sweep
generator and
horizontal
pre-amp cir-
cuits
.
no
sweep
output
For a
trouble not covered by this chart,
use the
troubleshooting methods in steps 6
and 7 of the
troubleshooting techniques .
Set triggering
COUPLING to EXT
and apply a 1 kHz
signal to the EXT
TRIG IN connector .
Check trigger
pre-amp
and
input
cou-
pling
circuits .
Fig . 4-2
. Troubleshooting chart for the Type 7B51 .
Check sweep
generator and
trigger gener-
ator circuits .
sweep T R I G'D
lamp lights
Maintenance--Type 7B51
Check trigger
generator cir-
cuit .
4- 5