Tektronix 7B52 User manual

ΙΝ ST RU CTI ΟΝ
ΜΑΝ V A L
7 Β52
Serial Nu mber
DUAL
TIME BASE
Tek
tro n ix, Inc
. *
Ρ . Ο . Box 500
"
B eaverton, Oregon 97005 " Ph one 644-0161
"
Cables :
Te k tronix
070-1043-00

670

TABLE OF CONTENTS
Abbreviations and symbols used in this manual are based on or taken
directly from
IEEE
Standard 260 "Standard Symbols for Units",
MIL
STD-12B
and other standards of the
electronics industry . Change information, if any, is located at the rear of this manual .
71352
SECTION 1 SPECIFICATION Page
Preventive Maintenance 4-1
Introduction
1-1
General 4-1
Electrical Characteristics 1-1
Cleaning 4-1
Main Sweep (Table 1-1) 1-1
Transistor FET, and Integrated
Dly'd Sweep (Table 1-2) 1-1
Circuit Checks 4-1
Triggering (Table 1-3) 1-2
Recalibration 4-1
Mixed Sweep, Variable Time Delay
Troubleshooting 4-2
(Table 1-4) 1-2
Introduction 4-2
Amplifier (Table 1-5) 1-3
Troubleshooting Aids 4-2
Environmental Characteristics
Troubleshooting Equipment 4-3
(Table 1-6) 1-3
Troubleshooting Techniques 4-3
Corrective Maintenance 4-4
SECTION 2 OPERATING INSTRUCTIONS
Obtaining Replacement Parts 4-4
Soldering Techniques 4-5
General 2-1
Component Replacement 4-5
Installation 2-1
Front Panel Controls and Connectors 2-2
SECTION5 PERFORMANCE CHECK/CALIBRATION
Test Set-up
Chart
2-9
First-Time Operating Instructions 2-9 Introduction 5-1
Sweep Calibration Check 2-9
Test Equipment Required 5-1
Simplified First-Time Operation 2-9 Short
Form Procedure 5-2
General
5-5
SECTION3 CIRCUIT DESCRIPTION
Procedure 5-5
Introduction 3-1
Simplified Block Diagram 3-1
SECTION
6 ELECTRICAL PARTS LIST
Main Sweep Mode 3-1 Abbreviations and Symbols
Delayed Sweep Mode 3-1 Parts Ordering Information
Mixed Sweep Mode 3-3 Index of
Electrical Parts List
External Horiz Input 3-3
Circuit Description 3-4
SECTION 7 DIAGRAMS AND MECHANICAL PARTS
Introduction 3-4
ILLUSTRATIONS
Main Trigger Generator 3-5
Main Sweep Generator 3-7
Diagrams
Delayed Trigger Preamp
3-10
Mechanical Parts Illustrations (on
Delayed Trigger Generator 3-11
reverse side of Diagrams)
Delayed Sweep Generator 3-11
Horizontal Preamp 3-13
SECTION 8 MECHANICAL PARTS LIST
Time/Div Readout Switching 3-14
Mechanical Parts List Information
Index of Mechanical Parts Illustrations
SECTION4 MAINTENANCE
Mechanical Parts List
Introduction 4-1 Accessories

F ig . 1-1 . 7Β52 Du al
Time B ase .

Introduction
T he 71352 D u al Time Base
is designed s p ecifically for use
wit h t h e 7503 In d icato r Oscilloscope
; h owever, it is com-
p ati
b le wit h all 7000-Series Indicator
Oscillosco p es . T he
71352
features cali b rated swee p s
from 5 s/div to 50 n s/ d iv
(0 .5 s/ d iv to 5 n s/ d iv wit h Χ 10
M agnification), triggering to
100 MHz, an d fo u r d is p lay
mo d es . Ot h er featu r es incl ude
lig h te d p u s hbu tto n
switc h es, 0 to 10 times continuou s
sweep d elay, brig h
t
b ase
line in A U TOmo d e in a b se n ce of
a d e q uate triggering signals, an
dan A MPL p osition fo r Χ - Υ
operation .
Display mo d es i n clu de MAIN S WEEP, I NT EN SI F I
E
D
S WEEP, D EL AY E D S WEEP, an d M IX E D S WEEP
.
In t h e
M IX E D mo d e, t h e Main Swee p is d is p laye d to αp oint selec-
te d by t he D EL AY TIME MUL T, after w h ic
h
t he
sweep
rate is determine d by D L Y'D S WEEP
setti ng . T h is mo d e
p ermits sweep magnificatio n of any p
oint on t he n ormal
( M ain) sweep selected by t he D EL AY TIME M UL
T control .
T he Performance
C h eck p rocedure given in Section 5
provi d es α
convenient met h od of c h ec k ing p erformance of
t
h is
instr u ment . T he followi ng electrical ch
aracteristics
apply over α calibration i n terval
of 1000 h ours o r six -
mo n t h s (wh ic h ever occurs
first) at an am b ient temperatu r e
of 0 ° C to +50 ° C, unless oth
erwise note d . W a r mup time for
given accuracy is 20
minutes . T he instrument m u st be
operating in α cali b rate d in d icator
oscillosco p e for given
accu racy .
ELE CT R ICA L C H A R ACT ER
ISTICS
MAIN
S WP E lect r ical C ha r acteristics
Time Interval
Ce n ter 8
Divisions
50 ms/Div
to
.5 μ s/Div
Ch
ange infor mation, if any, affecti
n g
t h is
section will be fou n d at t h e rear of t h is manual
.
TA BLE 1-1
Differential Sweep

M easured in 7500-Series
Accuracy' Ι Oscillosco p e
'T h e term "Diffe r en tial Sweep" r efe rs to Sweep d is p lay meas
u
re d
over t he cente r 8 divisions of t h e g r atic u le .
2 Meas u re Mag acc ur acies betwee n fi r st a nd ni n t h segme n t of un-
magnified sweep .
S
E CTIO N l
S
PE
CI
F I CA ΤΙΟΝ
TA BLE 1-1 (co n
t)
TA
BLE 1-2
D L Y'D S W Ρ Elect
r
ical Characteristics
Perfo r ma n ce Re qu
i r eme n t
M easured i n 7500-Series
Oscilloscope
71352
Cha r acte r istic Perfo r ma n ce R e q uirement
5 s/Div to 3% 3 .5% 4% 5%
.1 s/Div
and
.2 μ s/Div to
.05 μ s/Div
Any two Divi- 5% of 7% of
sions with in Ce n - meas u rement measurement
ter 8 Divisions
Swee p R ate MAIN Continuo u sly varia b le between cali-
V A R IA BLE R ange b rate d sweep rates . Exten ds sweep
rate to at least 12 .5 s/Div .
Swee p L engt h 10 .4 Divisio ns with in
0
.3
Divisio n
at
1 ms/Div . (Ad j uste d at t h is rate .)
10 .0 to 13 .0 Divisio ns at all ot h er
swee p rates .
Swee pHold off
Time
5 s/Div to 1 times t h e ΤΙΜΕ /DI V switc h
10 μ s/Div setting or less .
5 μ s/Div to
2 .5 μ
s
or
less
.05 μ s/Div
N
ormal/
M
ag W
it h i n 0 .5 Division .
R egistration

Specification-7B52
C ha r acteristic

Ι

Performance R equiremen t
Any two Divi-
sions wit h in Cen-
ter 8 Divisions
C h aracteristic
Trigger Sensitivity
Cou p li n g 3
Jitter
AC
DC
Single Swee p
( M ain Only)
.5 s /Div to
.1 s /Div and
.2 μ s/Div to
.05 μ s /Div
Internal Trigger
TA BLE 1-2 (cont)
10 .4 Divisions
with in 0 .3 Divisio n
at 1 ms/Div .
10 .0 to 13
Divisions at all oth er
swee p rates .
Determine d by MAIN SWP TIME/
DI V switc h setti ng .
TA BLE 1-3
Trigge r ing Electrical C h aracteristics
AC LF REJ 4
( M ain Only)
AC
HF REJ
( M ai
n Only)
1 ns or less at 75 MHz .
ment
mum
ηαΙ
υ ice d
Performance
R eq uire
Triggering
Frequency
R ange
30 Hz-10
MHz
10 MH z-100 MH z
30
kH z-10 MHz
150 kH z-10 MH z
10 MH z-100 MH z
30 Hz-50 kH z
DC -
10 MH z
10 MH z-100 MHz
M ini
Sig
R e q
ΙΝΤ
0 .3 Div
1 .5 Div
0 .3 Div
1 .5 Div
0 .3 Div
0 .3 Div
1 .5 Div
Triggeri n g re qu irements same as
M ain Swee p . Wh en triggere
d , sweep
generator p ro d uces 1 swee p .
ΕΧΤ
150 m V
750 m
V
150 m
V
750 m
V
150 m
V
150 mV
750 m V
3 Οη I n ter n al
T r iggeri ng Only, t he s p ecifie d upp er -3 d B
f r
equen
cy
of the Vertical System
re p laces any f r e qu encies i n t h e ab ove ta
b le
w h e n t h e numb e r i n t h e table is greater t ha n t h e upp er -3
dB
f r e qu ency
of t he i n d icator oscilloscope V e r tical Am p
lifier .
4 W ill not trigger on sine
waves of 3 Divisions or less i n te rn al, or 1 .5
volts exte r nal, below 120 Hz .
TA
BLE 1-3 (cont)
TA BLE 1-4
M ixe d Swee p , V ariable Time
Delay
Electrical C h a r acteristics
C h aracteristic
Performance R e q
uirement
Exter n al Trigger
Input
M axim um I n p ut
500 volts (DC p l u s p ea
k AC) . 500
Voltage
volts (pea k -to- p ea k AC to
1 kH z or
less) .
Input R
esistance 1 mego h m
with in 2°/ ο .
In pu t Ca p
acitance 20 picofara dwit
h in 2 p icofara d .
L evel R
ange
ΕΧΤ
At least +3 .5 volts to -3 .5 volts .
ΕΧΤ
-
10
At least
+35 volts to -35 volts .
( M
ai
n Only)
Auto Brig h t Base L ine Swee p
free-runs in ab sence of tr ig-
( M ain Only) gering signal
in AU TO .
C h aracteristic Performance R equirement
Mixed Swee p
Swee p Accuracy 2°/ ο p lus measure d MAIN S WP error .
Exclu de following portions of
M ixe d Swee p ; first 0 .5 Divisio n s of
M ain Swee p an d0 .2 Division or 0 .1
μ s, w h ic h ever is greater, after tran-
sition of Main Sweep to Dly'd
Swee p .
Varia b le Time Delay
Differential Delay
Accuracy
Center 8 Divi-
sions
5 s/Div to W it h i n 2°/ ο
1 s/Div
.5 s/Div to W it h in 1%
1 μ s/Div
Multi p lier L
inearity W it h in 0 .2% of full scale (1 mi n or
d ivision) .
Jitter 1 p a rt or less in
20,000 of 10 times
t he TI ΜΕ /DI
V switc h setti n g .

TABLE 1-5
Am p lifier Electrical Characteristics
Transportation
Specification-71352
TABLE 1-6
ENVIRONMENTAL C HARACTERISTICS
T his instrument
will
meet the electrical characteristics
given over the following environmental limits .
C haracteristic
Altitude
Non-Operating
P erformance R
e quirement
To
50,000 feet and -55 ° C .
Qualified un d er N ational Safe Tran-
sit Committee test p roce d ure 1 Α ,
category ΙΙ .
C h aracteristic P erformance R equirement
Deflection F actor
ΕΧΤ , Χ 10 M AG 10 millivolts/division
within 10% .
ΕΧΤ
100 millivolts/division within 10% .
ΕΧΤ
-
10
1 volt/ d
ivision within 10% .
F re q uency R es p onse System -3 dB p oints in 75-Series
Oscilloscope
L ower -3 dB Up p er -3 d B
AC
40 H z 2 MHz
AC LF REJ 16 kHz 2 MHz
ACHF REJ 40 H z 100 kHz
DC DC 2 MHz

General
T h e 71352 Dual Ti m e Base U nit is designe d s p
ecifically
for use wit h Te ktronix 7500-Series I nd icator Oscillosco p
es
having one h orizontal p lug-in com p artment ; h owever, it is
compati b le wit h all Te ktronix 7000-Series In d icator
Oscillosco p es . To effectively use t he 71352, its o p eratio n
and ca p abilities s hould be k nown . T h is section d escribes t h e
o p eration of t he front- p anel controls, gives first-time an
d
general o p erating information, lists someb asic a pp lications
and tells h ow to ma k e t h e instrument co mp ati b le with all
7000-Series oscillosco p es .
Installation
T h
e
71352 is designe
d to o p erate in t h e h orizontal p lug-in
comp artment of t he oscillosco p e . T he
71352
can also be
installe d in α vertical p lug-in co mp artment to p rovi d e α
swee p t h at runs vertically on t h e C R T . H owever, w hen use d
in t h is manner, t here is no retrace blank ing or internal trig-
gering p rovisions, an d t h e unit may not meet t he s p ecifica-
tions gi v en in Section 1 . T h e instructions in t h is manual are
written for use of t h e 71352 in t h e horizo n tal p lug-in
comp artment .
Before procee d ing w it h
installation,
it is
necessary to set
two internal 71352 switc
hes w h
ic
h p rovide pro p er triggering
SECTION 2
O
P E R A TI N G
I N
ST RU
CTIO N S
C h ange info r mation, if any, affecting t h is section
will
be
found at t h e r ear of t h is manual .
F ig . 2-1 . L ocation of DE L AY E D T R IGG ER SO UR C E and MAIN-
FRAME
D EL AYI N G M OD E switc h es .
signals from wit h in or to t he in d icator oscillosco p e main-
frame . T he D EL AY E D T RIGG ER SO UR C E and MAIN-
FRAME D EL AYI NG M OD E switch es p erform t h
ese
functions ; see F ig . 2-1 . Table 2-1 lists t h e SOUR C E an d
M OD E
switc h p ositions for using t h e 71352 in any
7000-Series
Indicator Oscillosco p e .
TA BLE 2-1
I wwttc h m ust be in t h is p osition to obtain intensified
sweep .
71352
2 Fun ctio n al only wh e n 71352 is
place d in Α H O R IZ compartme n t of
7504 or 7704 .
In d icator Oscillosco p e an d H orizontal
Plug-in Com p artment U se d
Switc h 7503 7504-7704 7504-7704
P osition Α H O R IZ Β H O R IZ
D EL AY E D
T RIGG ER
SO UR CE
MAIN H orizontal Α H
orizontal
ΒH
orizontal
Trig Selector Trig Selector Trig
Selector
A U X L eft
V ertical
Β
H orizo n tal Α H orizontal
Signal Trig Selector Trig Selector
MAIN-
FRAME
D EL AYI NG
M OD E
In d e p
en d ent N ormal N ormal N ormal
( R ear)
Ru ns After ------ Delaying Sw
p
------
(Center
)2
( Β H
orizontal
R
uns After
Delay
Interval)
Triggerable ------ Delaying Sw
p ------
After ( F ront) 2 ( Β
H orizontal
Triggerable
After Delay
Interval)

O p erating
Instructions-71352
To install t he 71352 into
α plug-in com p artme
n t, push it
in until it fits firmly
into t he com p artment
. To remove, pull
t he release latc h
(see F ig . 2-2) to d
isengage t he unit from
t he in d icator
oscillosco p e an d pull
it out of t hep lug-in
com p
artment . E ven t h oug h t
heh orizontal gain of t h
ein d i-
cator
oscillosco pe is stan d ar d
ize d to minimize a d j
ustment
w hen inserting p lug-ins, t
he swee p calibratio nof
t he 71352
sh oul d be ch ec ked
. T heprocedure for ch ec
k ing t he unit is
given
under Swee p Calibratio n C
hec k i n t he F irst-Time
O p
erating Instructions of t
h is section .
F
ig . 2-2 . L ocatio n of release
latc h .
FR O N T- P A NEL CO
NTR O LS an d CO
NNE CTO RS
General
All
controls require
dfor t he o p eration of
t h e 7 Β 52 are
locate d on th efront
p anel of t he unit (see
F ig . 2-3) wit h
t he exce p tion
of t h e internal D EL AY
E D T RIGG ER
SO UR CE an d MAIN-FRAME
D EL
AYI N
GM
OD Eswitches .
Toma k efull
use of t h e ca p ab ilities
of t h is instrument, the
o p erator
s h o u l d be familiar
with t he function and use of
eac hof t hese controls . Α
d etailed descri p tion of t he
front-
p anel controls and
connectors is given h ere .
M ain Triggering
Controls
LEVEL /S L O PE
2-2
T he LEVEL /S L O PE
control d eter-
mines w h et her t he
trigger circuit
responds on t h e p
ositive-going or
negative-going portion
of t he trigger
signal . Wh en t
h e indicator line on
t he outer
ring of t h e LEVEL /
S L O
PE control is to th e left of
center, t h
e
d is
p lay starts
on
t he
p ositive-going portion of
t he wave-
form (notice
p ositive-going wave-
form symbol to left of control) .
To

TR IG'D L A MP
t h e rig h t of center, t he dis p lay
starts on t he negative-going p ortion
of the
waveform (notice negative-
going waveform symbol)
. Wh en
several cycles of α
signal app ear in
t he dis p lay, t he
selection of t h e
trigger slo p e
is often unim portant .
H owever,
if
only
α certain p ortio
n
of αcycle
is to be d is p layed,
correct
setting of t h e LEVEL /S L O
PE
con-
trol is im portant to p
rovi de α dis-
play w h ic h starts on
t hed esire d
slo pe of
the in p ut signal .
T he LEVEL /S
L
O
PE control deter-
mines t he
voltage level on t he
trig-
ger signal
at w h ic h t he dis p lay
is
triggered, as well as selecting
t he
trigger slo pe . T h e center
k no bof
t h e LEVEL /SL O PE
control p ro-
vi des
about α 3 :1 re d uction
in rela-
tion to t h e outer in d icator
ring, to
allow p recise level
selection . T h is
control can also be turne
d t h roug h -
out
t he com p lete 360 °
rotation to
allow contin uous triggering
over t he
selecte
d slo p e . Wh en t h e
LEVEL
/
SL O
PE control is set to t
he line
on
eit h er t hep ositive-going
or nega-
tive-going waveform sym
b ol t he
swee p is triggere d near
t h e zero-volt
level
of t he trigger
signal (AC
cou p
le d only) . As
t he LEVEL /
S L O
PE control is
rotate d away
from
t h e zero line,
t h e d is p laye d
waveform starts at
α point corre-
s p ond ing to
t he p osition of
t he
in d icator
line
on
t h e associate d
slo pe waveform
symbol . For
exam p le, if t he
LEVEL /S L O PE
control is turned
clockwise from
t he zero line on
t hep ositive-going
slo pe
symbol, t hed is played wave-
form starts at α morep ositive
level .
B efore setting t
h e triggering
level, select t
he
T
RIGG ER I N G
M OD E , CO
UPL I N G an d SO UR CE .
T h en
ad
j ust
t he LEVEL /SL O PE
control so
t hed is p laye d waveform
starts at t he desire d point . T h
e trig-
gering slo pe can be c h ange
d at
any
time by rotating
t h e LEVEL /
SL O PE
control to t h e corre-
sp on ding p
oint
on
th e ot h er slope
waveform
symbol .
The TR IG'D lam p provides α con-
venient in d ication of t he
condition
of t h e trigger circuits . If t
h e
MAIN

TR
IGG ER I NG M OD E , CO U -
PL I N G, an d
SO UR CE switc h es are
correctly set an d
α suitable trigger
signal is a pp lie d , t h e
T R IG'D lam p
is on . U n d er certain
con d itions, t h e
T R IG'D lam pmay
be off, in d i-
cating t h at
t
h
e swee p is not trig-
gered . T h e
cause mig h t be α mis-
ad j ustment of t he
LEVEL /S L O PE
control, incorrectly set
CO UPL I NG
or SO UR C E switch es,
low trigger
MAIN
TRt Γ ,
Γ ,f : R I NG
C, ON'
ί P ,
Ω IS
Ω tε;{
` t- Ι! Υ
"ι '? Q ς :ιF _
( : ΠΝΤ R Πι S
OF LAY
Γ) ΝΤί3
Π
γ
.  ...
.~
.
C
.
αι :e~ .
α .
Τιπ 1 Ε ;D Ι V o t τ DU Y
TIME
F ig . 2-3 . F ro n t- Pa
n el co n trols a n d conn ectors .
Operating
Instructions-711352
signal
am
p
litu d e, or α trigger signal
re p etition rate
outside t h e acce p t-
able fre q uency range
. T h is feature
can be use d as α general
indication
of
correct triggering . It is p artic-
ularly useful
w hen setting up t he
trigger circuits
w hen α trigger signal
is available wit h
out α dis p lay on t h e
CRT . It also indicates t h
at t
h
is unit
is
correctly triggere d w h en
o p
er-
ating as α
D L Y'D S WEEP .
lil Υ Π
TM ,i ;I N
i,
GC),
. .
:1 esζ jL ~,
INPUT
CONNECTORS
2- 3

Ope r ating
Instructions-71352
M OD E
2-
4
A U TO
N O RM
T he pu
s hb uttons locate dund
er the
M OD E title select t
he mode i n
w h ic h t he sweep
is triggere d . T he
selected
mo d e i n w h ic h t he swee p is
triggered .
T he selected mo de is i n di-
cate
d by α lig h te d p u s hb utton .
Wh
en t he AU TO p us hb utto n is
illumi n ated, α triggere d d isplay is
p rese n te d with t h e correct setti ng
of t h e LEVEL /S L O PE control
w heneve r an a d e qu ate trigger sig
n
al
is a pp lied . T he ra
n ge of t he
LEVEL /S L O PE control
i n t h is
mo de is ±8 vertical
divisio n s . T h e
TR IG'D lig h t i n d icates
w hen t h e
d isplay is
triggere d .
Wh en t h e trigger
repetition rate is
below abo u t 30
h ertz (or outsi d e
t he freque ncy range
selecte d by t h e
CO UPL I N G switc h ) or
w hen t he
trigger signal is
i n a de q u ate, t he
sweep
free-ru n s at t he swee p rate
in d icate d b y t h e ΤΙΜΕ
/DIV or
DL ' Υ TIME
switc h to produce α
refere n
ce
trace (T R IG'D lig h t off) .
Wh
en an adeq uate trigger signal is
again a pp lie d , t he free-r unn ing con-
dition en d s and α trigge r ed d isplay
is p roese n ted . Wh en t h e LEVEL /
SL O PE co n trol is at α setting o u t-
si de the am p litude range of t h e
t r igger sig n al, t h e swee p also free-
runs at t he sweep rate in d icate dby
t he ΤΙΜΕ /DI V or DL'Y TIME
switc h . T h is type of free-r u nni
n g
dis p lay can be u sef u
l
to measure
only
t h
e
maximum peak
-to-pea
k
am p litu de of α sig n al without ob -
serving t he waves hap e (suc h as in
ban d width measurements) .
Wh en
the N O RM p us hbu tton
is
p ressed, α triggere d d isplay is p
re-
se
n
te
d wit h t he correct setting of
t he
LEVEL
/S
L O PE con trol
w h en-
ever an adeq uate trigger
signal is
ap p lied . T he
range of t he LEVEL /
SL O PE
control in t h is mo d e is ±8
vertical d ivisions .
Th e TR IG'D lig h t
in d icates
w h en t h e d is p lay is trig-
gere d .
T h e N O RM
trigger mo d e must be
u se d to p ro
duce triggered d is p lays
with
trigger repetitio n rates below
SI NG LE S WP
30 h ertz . Wh en the LEVEL /S L O
PE
con trol is at α setting o u
tsi de the
amplit ude range of t he trigger sig-
nal, w hen t h e trigge r repeition rate
is ou tsi de the
fre
quency ra
n ge
selecte d by t he CO UPL I
N
G
switc h ,
or
w hen t h e trigger signal is i na d e-
q u ate, t h ere is
no
trace (T R IG'D
lig h t is off) .
Non-repetitive,
ran d
om
signals
can
be d
is p
layed i n t h e single-sweep
mo
de b y first obtaining t he b est
p ossi b le d is p lay in t he N O RM
M OD E with α sig n al w h ic h is a b out
the same am p litu d e a nd fre q uen cy
as t
he
random
signal .
T
hen with o u t
ch angi ng t h e ot h er T R IGG ER
I
N
G
controls,
press t he
SI
N
G
LE
S
WP
p us hbutton . Wh en ready for t h e
ran d om sig n al, p ress t he RE S ET-
RE ADY pu s hbu tton . T he RE S ET-
RE ADY pus hb utton remains
lig h ted to i nd icate t h at t h e u n it h as
b een reset a nd is rea dy to pr o duce α
sweep . T he lig h t goes ou t after t h e
ra n dom signal triggers t h e u nit . To
p re pa r e t he unit fo ra n ot h er single-
sweep dis p lay, p r ess t he RE S ET-
RE ADY pu s hbu tton agai n .
Wh
en u sing t h e si n
gle-swee p mo d e
to ph otogra ph
waveforms, t h e grati-
cule must be ph otogra
phed sepa-
rately i n t he normal
manner to
preve n t
over-exposi ng t he film . B e
sure t h e
camera system is well pro-
tecte d agai
n
st
stray lig h t, or operate
t he system
in
α
d ar ken e d room . F o r
r epetitive
wavefo r ms, p ress t h e
RE S ET- RE
ADY p us hb utto n only
once
for each waveform un less t h e
signal is com p letely symmet r ical
.
Ot
h erwise, multi p le waveforms may
a p pear on t he film . F o r ra n dom
sig
n als, the came r a le ns can be left
o p
en until t h e ra nd om signal trig-
gers t he unit ( RE S E T- RE ADY
p us hbu tton lig h te d ) . Fu rt h er i n
for-
mation on ph otograp h ic tec h
ni qu es
is given in t h e camera
instruction
ma
n
ual
.
Wh en t he signal to be d is p layed
is
not re p etitive or varies in am p
li-
t u d e, waves h ape or re p
etition rate,
αcon ventional
repetitive type dis-
play may p ro duce an un sta b le pre-

sentation . Α stable dis p lay can
often be obtaine d un d er t h ese cir-
cumstances by usi ng t he single-
swee pfeature of t h is unit . T h e
SI N G LE S WPM OD E is also useful
to ph otogra ph non-repetitive or un-
stable dis p lays .
To obtain α single-swee p d is p lay of
α re p etitive signal, first obtain t h e
best p ossi b le d is p lay in t he N ORM
M OD E . T h en wit h out c h anging t h e
ot h er T RIGG ER I NG controls, p ress
t h e SINGLE S WP push button .
Wh en rea d y to view t h e single-
swee p dis p lay p ress t he RE S ET-
RE ADY PU S HBUTTO N . Α single
trace
is p resente d each
time
t h e
RE
SE
T- RE ADY push button is
p resse d (as long as t h e re p etitive
sig-
nal remains connected to t h e
system and T RIGG E R I NG controls
are correctly set) and furt h er
swee p s cannot be p resented until
t h e RE S E T- RE ADY p us h button is
p resse d again . If t he d is p laye d
sig-
nal is α com p lex waveform com-
p osed of p ulses of varying am p li-
tud e, successive single-swee p d is-
CO UPL I NG
AC
=06-
~~~~ : E
~C ~~ . . .ΝΙΙ ~ . . Ν
IIT~
. . ~ . "1
ME!
1 :~
.1111-01,11111111111111
:~ : - μ _,
σ -

 11_`_-,
ΝΙΙ

.
~
M
111
σ : : :
~ Ν "1
11 I'm ~~ .
Ισσ : :
?= : α =
σΙ :: Ο: σ
== θ : :
1
:ά ~~ θ := : ϋί
ι
~~ θ := : ϋί
~ . . . ., .
F ig . 2-4 . F re qu ency ra n ge of eac h CO UPL I NG switc h
position .
Op erating
Instructions-71352
p lays may not start at t he same
point of t he waveform . To avoi d
confusion due to th e CRT p ersist-
ence, allow
t h
e
disp
lay
to
decay
be-
fore p ressing t he RE
S
E
T- RE
ADY
push button again . At fast swee p
rates, it may be difficult to view t he
single-swee p dis p lay . T he apparent
trace intensity can be increase d by
re d ucing t he ambient lig h t level or
using α viewing
h oo das recom-
men ded in t he
in
d
icator instruction
manual .
T h e pus h buttons locate d below t h e
CO UPL I N G title selects t he met h o d
in w h ic
h
t h
e
trigger signal is con-
necte d to
t
he trigger
circuits . T h e
selecte d cou p ling is in
d
icate d
by α
lig h
te dpush button . E ac hp ositio n
permits
selection or re j ection of t h e
fre q uency
com p onents of t he trig-
ger signal
w h ic h trigger t h e swee p .
F ig . 2-4 gra
p
h
ically illustrates t h e
ban dof fre quencies
covered by
eac h p osition
of t he CO UPL I NG
switc h .
In t he AC p osition of t h e CO U -
PL I NG switc h , t h e DC com p onent
2-5

Ope r ating Instructions-71352
2-6
AC LF
REJ
ACHF REJ
DC
of t
h e trigge r signal is b loc ked . Sig-
n als with low-frequency com
p o-
nents below a b o ut 30 h e
r tz are
atte n uate d . In
general, AC
CO UPL I NG
can be used for most
ap
plicatio n s . H owever, if t h e sig n al
con
tai n s un wa n te d fre qu ency com-
po nen ts or if the sweep is to be tr ig-
ge r e d at αlow r epetitio n r ate or DC
level, one of t h e
remai n i ng
CO UPL I NG switc h p
ositio n s will
p rovide αb etter d is p lay .
T he trigge r i ng p oint
i n
t
he AC p osi-
tion d epends upon t
he average volt-
age level of t he trigger
sig n al . If t he
trigger signal occu
r s r andomly, the
average
voltage level will vary,
ca u sing
t
he trigge
r ing p oi n t to vary
also . T h is s h
ift
of
the triggering
p oi n t may be enoug
h so it is
im p ossible to mai n tain α sta
b le
dis-
play . In s uch cases, use
DC
cou p li ng .
In t h e AC LF
REJ position, DC is
re j ecte d and
low-frequency trigger
signals below about 30
k ilo h ertz are
attenuate d . T h erefore,
t h e swee p is
triggere d only by
t h e h ig h e r -
fr e quen cy compo
nen ts of the tr ig-
ger signal . T
h is position is partic-
ularly useful
for provi d ing sta b le
triggering
if t he trigger signal con-
tains li n e-fre quency compone
n ts .
Also, t he AC LF REJ
positio n p ro-
vides t he best
alternate mo de verti-
cal
d
is p lays
at fast sweep rates
w
h en com p aring two or more un-
related sig n als (wit h d ual-t r ace ve
r -
tical or slave d triggeri
ng operatio n
for d u
al-vertical u nit op eration) .
T he ACHF
REJ p osition passes all
low-frequency
signals between
ab
out
30
h ertz and 50 k ilo h ertz .
DC is r e j ecte d and signals ou tside
t h e above r ange are atte n uated .
Wh e n trigge r i ng from com p lex
waveforms, t h is p ositio n is u seful
fo r provi d ing α sta b le d is p lay of t
he
low-frequency com pone n ts .
DC CO UPL I NG ca n be used to pr o-
vide sta b le triggeri n g wit h low-
frequency sig n als w h ic h wo u
l d b e
SOUR C E
I NT
L I NE
ΕΧΤ
atte n uate d in t he oth er mo d es, o
r
with low-repetition rate sig n als . It
can also b e used to t
r igge r t h e
swee p w h e nth e
trigger signal
reac h es α DC
level selected b y t h e
setting
of t h e LEVEL /S L O PE con-
t r
ol
. Wh en u si ng i n ternal t r igge r ing,
the setti ng of t h e vertical un it posi-
tion con trol affects t he DC
trig-
ge r i n g point .
T he p us hb uttons locate d below
t he
SO UR CE title select t he
source of
t h e trigger sig
n
al
w h ic h is con-
nected to
the tr igger circ u its . T he
selecte
d so
u
rce is in d icated b y α
lig h te d pu s hb utto n .
In
t h e ΙΝΤ p osition of t he
SO UR
CE switc h , t he trigger sig n al
is
d erive d from t he associate d verti-
cal un it . Fu rt he r selectio n of t h
e
i n ter n al trigger sig n al may be
pr o-
vi ded by t he associate d ve
r
tical un
it
or i n dicator oscillosco pe ; see
t h e
i n str u ctio n manuals
for th ese
i n struments
for information . F or
most a pp
licatio n s, the ΙΝΤ -
SOUR C
E p ositio n
can
b e use d .
H oweve
r , some app licatio n s requi r e
s p ecial triggeri ng
w h ic h cann ot be
o b tai ned
i n t h e ΙΝΤ -SO UR C E posi-
tio
n .
In
s uch cases L I NE- o r ΕΧΤ -
SO UR
CE must be
used .
T h e L I
NE p ositio n of t he SOUR C E
switc h con
n
ects
α sam p le of t he
p owe
r -line voltage, to w h ic h t h e
i n
dicator oscilloscope is co n necte d ,
to t he trigger circ u it . L i ne tr iggeri n g
is useful w he n t he i np ut signal is
time-related (multi p le o
r
su
b -
multiple) to the
li
ne
fre quen cy . It is
also
u seful
fo r p r ovi d ingα sta b le
d is p lay of α li n e-f r e q u ency compo-
nent in α com p lex waveform .
An
exter n al sig
n
al
con n ecte d to t
he
MAIN T R IG
1 Ν con nector can
b e
used to trigger t h e sweep
i n t he
E XTSOUR C
E p osition . T he exter-
nal signal
must be time- r elated
to
t he d is p
laye d wavefo r m fo
r α sta b le
display . An exter n al
tr igger sig n al
can be used
to pr ovi d eα t r igge
r
e
d
d isplay
w hen t he inter n al
sig n al is
Ο

Swee p Controls
too low in am p litu d
e for correct
triggering or co n
tains signal com p o-
nents
on
w h ic h it is not desire d to
trigger . It is also useful w hen sig n al
tracing in am p lifiers, p h ase-s h ift
n etwor k s, wave-s h api n g circuits,
etc . Th e signal from α single p oint
in t he circuit un d er test can be con -
nected to t he MAIN TR IG IN con-
nector t h roug h α p robe or cable .
T he sweep is t h en triggere dby t he
same sig n al at all times an d allows
am p litude, time relations h ip or
waves h a pe ch a n ges of signals at
various p oi n ts i n t h e circuit to be
exami ned wit hout resetting t he
T R IGG ER I NG controls .
ΕΧΤ
-
10

O p eration i n t he ΕΧΤ
-
10 p osition
is t he same as d escribed for
ΕΧΤ
excep t t h at t he external sig n al is
attenuate d10 times . Atte
n uation
of h ig h -am p litude external trigger
sig n als is d esirable to b
roa den t he
range of t h e LEVEL /S L O PE
control .
ΤΙΜΕ /DI V or

T he ΤΙΜΕ /DI V or DUY TIME
D L ' Υ TIME

switc hp rovi d es 25 calibrate d
swee p
rates ranging from
.05 μ
s/ d iv to five
secon d s/ d iv . T he MAIN V A R I-
A BLE control m u st be in t he CA L
p ositio n (loc k e d i n) an
d
t he
Χ 10
M
AG switc
h
must
be off (loc ked
in)
for
t he in d icated swee p
rate .
D L Y'D S WEEP

The
D
L Y'D S WEEP switc h p rovides
22 calibrate d sweep rates ranging
from .05 μ s to .5 second .
MAIN
V A R IA BLE

T he MAIN V A R IA BLE control
incor p orates α two-position switc
h
to d etermi ne w h et h er t he sweep
rate is cali b rate d or un calibrate d .
Wh en t he knob is i n t he inwar d
p osition, t he MAIN V A R IA BLE is
ino p erative and t he sweep
rate is
calibrate
d .
Wh
en p ressed and re-
lease d , t he MAIN V A R IA BLE k nob
W it h DIS PL AY M OD E switc h at
ΙΝΤΕΝ or D L Y'D S WP, pull out on
t h e D L Y'D S WEEP switc h and
rotate cloc k wise .
O p erating Instructions-71352
moves outward to activate t h e
MAIN V A R IA BLE control for
un calibrated rates . Α calibrated rate
may be obtained at any
p osition of
t
he
MAIN
V A R IA BLE con trol b y
p ressing in and loc k ing . T h is feature
is useful w h en α s p ecific un cali-
brated swee p rate h as been ob -
taine dand it is desire d to switc h
between t h is un calibrate
d sweep
rate an d α cali b rate dsweep
rate .
T h e MAIN V A R IA
BLE control
allows
t h e sweep rate in each
ΤΙΜΕ /DI V switc h p ositio n to b e
re
d uced to at
least t he swee p rate
of t
he
n ext a
d j acent switc h posi-
tio
n .
T
h is p rovides an overall υη -
calibrated varia b le sweep range
from 50 ns/ d iv to a bout 12 .5
second s/ d ivision .
P OSITIO N

T he P OSITIO N control provi d es
h orizontal positioning of t he CR T
d isplay .
S WP CA
L

T he S WP CA L con trol
is α screw-
d river a d j ustment to set t h e
am
p
li-
tu de of t he outp ut sawtooth wave-
form .
Χ 10 ΜΑ G

T he Χ 10 M AG switc
h ex pa n ds t he
swee p
ten times .
T he ce
n
ter
d ivi-
sion of t he unmagnifie
d d is p lay is
t
h
e p ortion
visi b le
on
t h e CR T in
magnified form . Eq uivalent le n gt h
of t he magnifie dswee p is 100
d ivisions .
Dis
p lay
M
od
e Controls
MAIN
S WP

T he MAIN S WP selects swee p rates
as determi n e d by t he ΤΙΜΕ /DI V
switc h .
ΙΝΤΕΝ

T
h is is one of t he d elaye dswee p
f u nctio n s . In ΙΝΤΕΝ mode, α p or-
tion of t he
mai nsweep is i n te n si
fie d d uring t h e time t
h
at
delaye d
swee p is
i
n o p
eration as determined
by D L
Y'D
S
WEEP . (MAIN FR A ME
D
EL AYI N G M OD E switc h must be
in I nd e p endent p osition .)
2- 7

O
p erating Instructions-71352
D L Y'D S WP
M IX E D S WP
Delay Control
D EL AY TIME
MULT
Dly' d Triggering
Controls
D L Y'D
LEVEL
SL O PE
CO
UPL I NG
2- 8
One of t h e d
elayed swee p fu n c-
tions . In D L
Y'D
S
WP, t h e d elaye d
sweep is d is p layed
at t he en d of
eac h d elay p erio
d as d etermine d b y
t h e D L ' Υ TIME
a n d D EL AY TIME
MUL T control
setti n gs .
M ain
and d elaye dsweep
function .
In
M IX E D S WP
position, t h e main
sweep is d is p
layed
on
t he CR T to
t h ep oi n t d
etermine d by t he D E -
L AY TIME
MUL T control, fol-
lowed by t he d elaye d sweep .
T
he D EL AY TIME
MUL T (DT M )
provi d es variable
delay of 0 to 10
times t he b asic d elay
time selected
b y t h e D L ' Υ TIME switc
h .
Two p ositio n switc h actuated
b y
the
LEVEL control . At t he 'IN'
position,
the LEVEL, SL O PE, CO U -
PL I N G, an
d SO UR CE switc h es are
i nop erative .
H owever, t h e D L Y'D
Sweep
will ru n after DI' γtime as
determi
ne d by t he DL'Y TIME
switc
han
d setting of t he D EL AY
TIME MUL T control . In t h e'O U
T'
p osition, t he LEVEL, SL O
PE, CO U -
PL I N G, and SO UR C E switc
h es are
o p erative . In t h is con
dition, t he
Dly' d Swee p is triggerable .
P us hb utton switc h to select
eit h er
positive or negative slo p e of
d e-
layed trigger .
P us hbutton
switc h to select eit h er
AC (in) or DC (out) coupling .
AC : R
e j ects
DC
an d attenuates AC
sig n als below about 20 H z . Accepts
signals between 30 Hz and100
MHz .
DC : Acce p ts all triggers betwee
n
DC a nd100 MHz .
SO UR C
E
Input Connectors
MAIN T R IG IN
A MPL IN
DL Y'D TR IG IN
Am p lifier
P us h button
switc h to select trigger
source
.
ΙΝΤ (i
n
)
: Trigger signal obtai ned
from
vertical unit .
ΕΧΤ (out) : Trigger signal obtaine
d
from D L Y'D TR IG IN
connector .
BN C in p ut co
n nector for
external
triggeri
ng sig n al .
BN C i
np ut connector for
external
signal
. ΤΙΜΕ /DI V or DL'Y TIME
switc
h must b e i n A MPL an d
t h e
MAIN
TR IGG ER I NG SO UR
C E
switc h m u st be set for ΕΧΤ or ΕΧΤ
10 .
BN
C input con n ector
for exter-
nal d ly'd triggering
signal . D L Y'D
LEVEL control must be
out an d
t he
D L Y'D SO
UR C E switc h
must
be set for EXT .
in
some a pp
licatio n s, it is desirable
to
d is p lay one signal vs .
a n
ot
h er
(X-Y)
rat h er t han against time
. T he
A MPL p
osition of t h e ΤΙΜΕ
/DI V
or D L ' Υ TIME switc h , in
con j un c-
tio n with α signal app
lie d to t he
A MPL IN con nector,
provi d es α
mea n s of a p plying t h is sig
n al to t he
h orizo n tal am p lifier
. T he correct
MAIN TR IGG ER
I N G CO UPL I NG
and SO UR C E
switc h es must be
selecte d to corres
p on d to t he t h e
signal ap p
lie d to t he A MPL IN
connector .
Two modes of external
h oirzontal
operation are
p
rovide
d .
Wh
en t he
MAIN T R IGG
ER I NG SOUR C E
switc h is set to
ΕΧΤ or ΕΧΤ
-
10
p ositio n s,
external h orizontal d e-
flectio n is p rovide
d by t he signal
a pp
lie d
to
t h e A MPL IN con n ector .
T h e sig
n al coupling p rovi d ed b y t he
CO
UPL I N G switc hcan b e use d to
select or re j ect components of t
h e
exter
n
al
h orizontal signal .

General
Swee p Calibration C h ec
k
F irst-Time O p eration
T he external h orizontal
deflection
factor is app roximately
100 m V / d iv
in ΕΧΤ and 1 V
/div in ΕΧΤ
-
10
p ositions of
t h e
SO
UR CE switc h .
T E ST S ET UP C H A RT
F ig . 2-5 s
h ows t h e front p anel of t
he 71352 . T h is ch art
can
be re p ro d uce d a n d u se d as
α
gest
setup record for
s
p
ecial measurements, app lications,
or p ro d uces ; or it may
be used as α training ai
d for familiarization with t h is
i nstrumen t .
FIRST-TIME O PER ATI NG I N ST RU
CTIO N S
Wh
enever
t
he
71352
is inserte d i n to α plug-in com p art-
ment of an indicator oscilloscope ot h er t h a n t h e one in
w
h ic h it
was originally cali b rate d , t he sweep cali b ration
must be ch ec
ke d and read j uste d if necessary . Set t he two
i n ternal switc h es (see Installation t h is section), install t he
71352 into t h e p l u g-in compartment of an indicator oscillo-
scope, an d allow at least 20 minutes warmu p before p ro-
ceed i ngwith t he following :
1 . Connect α 1 kH z calibrator signal from t he in d icator
oscillosco p e Cal Out con nector via α 50 oh m BN C coaxial
cable to t he In p ut connector on t h e V ertical plug-in unit .
2 . Set t he 71352 ΤΙΜΕ /DI V or D L ' Υ TIME switc h to 1
ms, press t h e DIS PL AY M OD E MAIN S WP switc h a n d press
t he
MAIN
T R
IGG
ER I NG A
U TO, AC, a n
d
ΙΝΤ switc
h es .
3 . Set t he V ertical p lug-in unit for α C R T d isplay ampli-
tu
d
e of 2 to 4 d ivisions using DC coupli ng .
4 . R otate t he LEVEL /S L O PE co n trol for α triggere d
dis p lay .
5 . C h ec k t he CRT d is p lay for one com p lete cycle of
calibrator sig n al for eac
h
ma j or d ivision . (See F ig . 5-2 of
PERF O RM AN C EC HE CK /CA L I BRATIO N p roce d ure .)
6 . A d j ust S WP CA L ( α front- p anel screw d river a d ju st-
ment)
for
exactly 1 complete
cycle
of
cali
b
rator
sig n
al
for
eac h
ma j
or d ivision
on
t he
CRT . U se only t
he
center 8
graticule d ivisions .
U se t he following first time
operati n g procedure to b e-
come ac q
uainte d with t he 71352 . F or α com p lete d esc r ip-
Operating Instructions-71352
tion of eac h con trol a nd connector,
refer to CO NTR O LS
and CO NNECTO R S in t h is sectio
n .
1 . Complete p arts 1 t
h
roug
h6 of t he Sweep Calibration
C h ec k .
2 . R otate t he LEVEL /S L O
PE
con
trol and note t h at t h e
C R T dis p lay is triggere
d
on
t h e positive slo p e of t h e d is p lay
with LEVEL /S L O
PE on +, free-runs with LEVEL /S L O PE
control at to p and
b ottom, an d triggers on t he n egative
slo p e of t he dis p lay
with LEVEL
/S
L O PE on - . Also, check
t h at t he T R IG'D lam p is on
with triggere d d is p lay .
3 . P ress t he MAIN TR IGG ER I NG N O RM
switc h a nd
re p eat p art 2 . N ote t
h
at
t he CR T display is t he same,
exce p t w h
e
n t he LEVEL /S
L
O
PE control is at the to p a n d
at t
h e b ottom . At t h ese two positions, t h ere s h oul d be no
C
R T d
is p lay .
4 . P ress t h e MAIN T R IGG ER I NG SI
NG LE S WP switc h
and rotate t he
LEVEL
/S
L
O
PE control 360 ° . Note t h at
t
h
ere is no C
R
T
d isplay . R eturn t he LEVEL /S L O PE co n -
trol to
0/+ .
5 . O b serving t he CR T, press t he MAIN T R IGG ER I NG
RE ADY switc h . N ote t h at t h ere is one sweep eac h time t he
RE ADY switc h is presse d .
6 . Disconn ect t he Cali b rator signal from t he V ertical
unit I n p ut con nector an d p ress t h e MAIN T R IGG ER I NG
RE ADY switc h . Note t
h
at no sweep occurs, bu t t he
RE ADY
switc
h lig h t is
on .
7 . Observi ng t he C R T, connect t he Calibrator sig n al to
t he V ertical unit I n p ut connector . N ote t h at one sweep
occurs an d at t
he end of t he sweep t he RE ADY lig h
t
is
out .
8 . Pr ess t he MAIN TR IGG ER I NGA U TO switc h an d
rotate t h e . LEVEL /S L O PE control for α triggere d d is p lay .
R otate t he P OSITIO N con trol t h roug hout its range . Note
t h at t he d is p lay moves left an d rig h t across t h e C R T . P osi-
tion t he start of t he CRT display to t h e fift h vertical grati-
cule li ne (see F ig . 5-2 in PERF O RM A N C EC HE CK /
CA L I BR ATIO N proced ure) .
9 . P ress in t he Χ 10 M AG switc
h
an
d release . N ote th at
t he d is p lay still starts near t he fift h vertical
line
on t
he
C R T . R otate t he P OSITIO N control to
start t he display on
t he zero vertical
line . Note t h at t he d isplay now consists of
one
cycle
of
t he Calibrator signal rat h er t han 10 cycles . T he
rate of t h e d is p laye d signal is t he resulta n t of dividing t he
ΤΙΜΕ /DI V switc h setting
b y
10 .
2- 9

O p erating
Instructions-7B52
NOT E S :
7 Β 52 T EST
SET- U P C HART
MAIN T R IGG
ER I
N
G
7R16'
Ο Ο
LE V EL /S L O PE
52
0 :~
Ιι . . -Λ /
P OSITIO N
INTER
Ο DLY'D
3W P
_ j MIXED
D ELAY TIME MULT
SWP
CA L
1 Ν
-RU
N S

Ι
Α f ΤΕ .
Γ2
OILY TIME
ιΕνΕ t n
s
Ι
MAINVA R IA BLE ICA
L
IN)
ΟΤΙΜΕ /DI V O R DUY TIME
2
ms
5
.5
2
DISPLAY

10

5 ^ 0
us
MODE
ηευ r ε l Ι
MAIN
TIME/Dry
5Ο20

οιy
" ρ
51ηi
FF A

2a
M ODE
- . ϋ
5
ό ,
ι~
A MPL
5
2
S ELE CT MAIN SO U RC
E
AND CO U PL I NG .
TEKTRONIX @
OR
A MPL
`-O U T- OL YT S WP
TR IGG ER A BLE
SLO PE CO UPL
I
N G
SO UR CE
ΓΜΑΙΝ T R IG IN
F
ig . 2-5 . 7 Β 52 Test Setup C h art .
DL Y"0
T RIG
IN
F74-5-21

D
U AL TIME B AS
E
ΜΟΟΕ CO
UPL ING SOURCE
AUTO
AC INT
'
NORM AC LP REJ
LINE
SINGLE ,
AC N fRE J ΕΧΤ
RE SET I
DC ΕΧΤ +10
READY

10 . L oc k t h e Χ 10 M AG switc
h
in
(off) .
11 . Pull o u t on t h e D L
Y'D S WEEP switc hand rotate
cloc k wise to .1 ms .
P ress t he DIS PL AY M OD E ΙΝΤΕΝ
switc h . N ote t
h
at αno
r mal swee p ( M ain Swee p ) with an
i n te
n sifie dp ortio n (Dly'd Sweep) is d is p laye d on t he CRT .
R
otate t he
D
EL AY TIME MUL T (DT M ) con trol a nd note
t h at the i n te n sified po r tio n of t h e dis p lay is co n trolle db y
t h e DT M .
12 . R elease t he D L Y'D LEVEL control and
r otate it
from one e nd of rotation to t he ot h er (it is assume
d t h
at
t h e D L Y'D SL O PE, CO UPL I N G, and SO UR CE switc
h es are
loc ke d in :
+,
AC, and ΙΝΤ ) . N ote t h at rotatio
n of t h e
D L Y'D LEVEL control con tr ols t
h e triggering of t h e i n te n -
sified p ortion . R otate
t h e DT M , and observe t h at one com-
p
lete
r
evolutio
n
is re qu ired to
move t he i n te n sifie d sweep
one d ivision on t
he
C
R
T as
compare d wit h r otati ng t h e
DT M in p art 11 . L ock
in t h e DL Y'D LEVEL co n trol an d
set t
he
DT
M
to 5-00 .
13 . N ote t he sta r ti n g p ositio n of t h e i n te n sified p ortio n .
It s hou l d start at the fift h ve r tical line on t h e CRT . N ote
t he le n gt h of t he i n te
n sifie d portio n . It s h ould be o n e divi-
sio n , or o ne com p lete cycle of Calibrator sig n al . T h e
starti n g p ositio n of the intensified sweep is d ete r mi ned by
t h e res u ltant of m u ltiplying t h e D L ' Υ TIME switc h setting
(same as ΤΙΜΕ /DI V ) a nd t he DT M d ial setting . T he le n gt
h
of t h e i n te n sifie d portion is d etermined by t h e setti n g of
t h e D L Y'D S WEEP switc h setti ng .
14 . P
ress
t h e DIS PL AY M
OD
E DL Y'D S WP switc h .
N ote t h at the CR T d is p lay now consists of o n e cycle of
Calib r ator signal . T h is is also t h e i n tensifie d p ortio n o b-
serve d in p a rt 13, and gives t he sa m e result as obtai ned in
p art 9 . T he a d vantage of t h is mo d e over t he one u se d in
p
art 9 is t h
at any
cycle of t he Cali b rator sig n al may be
viewed in
α
mag n ifie d form b y merely rotati n g t h e DT M
control . ( R otate t he DT M to ve r ify .) R etur n t h e DT M to
5-00 .
15 .
Pr ess t he DIS PL AY M OD E M IX E D switc h . N ote
t
h at
t he CR T d is p lay now co n sists of 5 com p lete cycles of
normal sweep ( M ai n Swee p ) and 1/2 cycle of Dly' d sweep .
N ote also t h at t h e 1/2 cycle starts at t he fift h vertical li ne .
Und er t h e above conditio n s, t he first 5 cycles of Cali
br
ato
r
sig n al a r ep resente d at α rate of 1 ms (setti n g of ΤΙΜΕ
/DI V
switc h ), t h e Dly' d sweep sta
r
ts 5 m s after t he M ai n swee p
(DT M d ial setti ng times the D L '
Υ
TIME switc
h
setti n g),
a
nd t h e Dly' d swee p is r un ning at α rate of .1
ms (setti
n g
of
D L Y'D S WEEP switc h ) .
ΝΟΤΕ
Op
e r ati ng Instructions-71352
See t he Specification section fo r any deviatio n in t he
setti n gs liste d above .
16 .
R otate t h e DT M an d note th at, agai n , any portio n
of t h e Calibrato r signal may be viewe d .
17 . Disconn ect t h e Cali
b rator sig n al from the V ertical
U nit I npu t conn
ector an d r econnect it to t h e A
MPL
(MAI N
T R IG IN)
co nn ecto r . Set t he ΤΙΜΕ /DI V or DL'Y TIME
and DL
Y'D S WEEP switc h es to A MPL and pr ess
t
h e MAIN
TR IGG ER I N G ΕΧΤ switc h . N ote
t h at t he CRT d is p lay
now co n sists of two d ots se
p arately by ap p roximately 4
ma j or divisio n s .
18 . P ress the MAIN TR IGG ER I NG ΕΧΤ
-
10 switc h .
N ote th at the C R T dis p lay now co n sists of two h orizo n tal
dots se p arately b y a pp roximately
.4 d
ivisio n s .
T h is com p
letes t he F irst-Time O p eratio n . It s h oul d be
remem b ered diffe r ent sig n al i npu ts re q ui r e d iffere
n
t 71352
con trol settings, b ut t h e p roce d u r e for viewi ng th
ese signals
is esse n tially the same as give n in t
h
is p roce
d
u
r e .

Introduction
M ain Sweep M o d e
S
E CTIO N 3
CIRCUIT D E SC R I P TIO N
Ch ange info r matio n , if any, affecting t h
is
section will be fo und at t he rear of
t h is man u al .
T h is section of t he ma n ual con tai ns α d escri p tion of the
circ u itry used in t he 71352 Dual Time Base . T he d escri p tio n
b egi n s wit h αd isc u ssion of t h e ma j o r circ u it fu nctio n s u si n g
αsimp lifie d b loc k d iagram .
SI MPL I F I E D BL OC KDIAGR AM
T he Sim p lifie d B loc k Diag r am, F ig . 3-1, s h ows i n ter-
connection of t h eb asic circ u it b loc k s i n t he 71352 . In some
cases, suc h as t he M ain Swee p Trigger, t he b loc k inclu d es α
n umbe r of se p arate circ u its
. T
he
indivi du al circuits a r e
d isc u ssed in d etail later in t h is
sectio n .
Wh en t he DIS PL AY M OD E switc h is set to select MAIN
S WP,
o p eration is as follows
:
M ai n Sweep T r igge r . T h is bloc k incl u d es ci r cu itry for
selecti ng t h e trigger source, ty p e of coupli n g, triggeri n g
mo d e, and p oi n t on t h e trigge r sig n al w he r e trigge r i ng
occ u rs . Also, r egar d less of t he trigger sig n al s ha p e o r ampli-
t ude (wit h in
s p ecificatio
n ),
t
h
is circ u itry p rovi d es α fast-
r ise, un iform-am p litu de pu lse
to t
h
e
M
ai n Swee p Start
Mu lti . Termi n ation
of
t he
pulse
(or
gate) occurs at t h e
r
ise
of M ai n Swee p H ol d off .
M ai n Sweep Start ΜυΙ t ί. T h is circ u it is activate d by t he
p ositive gate from t he M ai n Sweep Trigger b loc k . T he o u t-
p ut sig n al coupled to t he M ain Sawtoot h Generator is α
positive gate wit h t he same d uration as t h e sweep . T h is gate
is also coupled to t he Swee p Gate Out b loc k . Α n egative-
goi n g
gate (coinci den t with t he positive gate) is coupled to
t he Delaye d Swee pL
oc
k
o u t Mu lti an d t he Delayed Swee p
Start Co n tr
ol b loc ks .
M ai n Sawtoot h Generato r . T h e main sweep
sig n al is
develo ped by t h e M ai n Sawtoot h Ge ne r ato r . Wh e n
α p osi-
tive gate from t h e M ain Sweep Start M ulti is app lie d , α
Sawtoot h wavefo r m is ge n erate d . T h e Sawtoot h d uratio n is
d ete r mine d by the p
ositive gate du r atio n . Rate of change of
t he Sawtooth is set b y Ct an d R
t, selecte d b y t he TIME/
DI V switc h .
71352
Sweep Stop Compa r ato r . O
ne
si d e of th is com p arato r is
d riven b y t h e mai n
sweep Sawtoot h signal, a nd t he ot h er
si de is set by t he M ai n
Sw
p
Sto p a dju stment . Wh e n t he
Sawtoot h waveform p asses t h ro ugh t h e
setti
ng of the
M ain
Sw p Sto p a dj ustment, t he o u t pu t of t he Swee p
Sto p Com-
parator switc h es to α p ositive level . T h is positive ste p is
a pp lie d to t he M ai n Swee p H ol d off an d via α small ca p aci-
ta n ce to t he M
ai
n
Sweep Start Mu lti . T h is resets t he M ain
Swee p Start Mu lti so t h at it is rea d y to receive
an ot
he r
trigger sig n al .
M ai n Swee p H ol d off . T h is circ u it d evelo p s α gate w h ic h
is used to preve n t ge n eratio n of α trigge r sig n al un til t h e
sweep ci r c u its have stabilize d after αswee p . T he p ositive
ste p f r om the Swee p Sto p Com p
ar ator i n itiates t he p ositive
h ol d off gate . T he d uration of t he h ol d off gate is varia b le,
depe nd i ng on t he setti ng of t he TIM Ε /DI V switc h . H ol d off
timi ng ca p acito rs are se p arate from swee p timing ca p aci-
tors . H ol d off is lo n ger for slowe r swee p rates .
Output from the M ain Swee p H ol d off is coupled to t h e
M ai n Swee p T r igger a nd t he Delaye d Swee p Trigger b loc k s .
Α t
r
igge
r
sig
n
al ca nn ot b e generate d d uring t h e h oldoff
i
n terval
.
T h e h oldoff serves to reset t he tr igge r ci r cuits so
th at t h ey are rea d y to receive
an
i
npu t trigger sig n al after
h ol d off .
H o r iz Out pu t . T he H oriz
O
u t pu tb loc k i n
cl ud es
theE
xt
H oriz Amp, P osition Am p , H oriz Dis p lay Selecto r , a nd
H oriz O u t Am p ci r cu its .
W it h t he DIS PL AY M OD E switc h set to MAIN S WP, t h is
bloc k selects t h e signal from t he M ai n Sawtoot h Ge n e r ator,
am p lifies
t he sig n
al,
and con verts t h e si n gle-en d e d i npu t to
α
push-pull
out p
ut
sig n
al
.
Α DC p ositioni ng level is also
a pp lie d to th is b loc k .
Delayed Sweep M ode
To ge ne r ate t he d elaye d sweep , t he M ain Sawtoot h
Ge ne r ato r m u st fi r st be gate d on (see M ai n Swee p M od e) .
Delay P ic k off . T h is circ u it s upp lies
αp
ositive
gate w h ic h
starts w hen t he mai n Sawtoot h sig n al p asses
t
hr
o ugh t he
level
selecte d by t he D EL AY TIME M OL T control .
T
he
gate en d s with
t
he
main Sawtooth sig n al . T he output sig n al
is coupled to t he Delay
Gate Amp .

Circ
u it Description
-7B52
3- 2
Fig . 3-1 . 7Β 52 Sim p
lifie dB loc k Diagram .

Delayed Sweep Trigge r . Wh en t he Delayed Trigger
LEVEL is pu s h e d in, t he
o
u
tp ut
trigger
is ge n erate d as soon
as t h e Delay Gate sig n al is
ap p
lie d .
If t he LEVEL co n trol is
out, t he outp ut
trigger is i
n
itiate d by the next i npu t trigger
after t he Delay Gate is
a pp
lied
.
T he Delaye d Swee p Trigger out p ut is α positive gate
w h ic h is termi n ate d b y t he H ol d off signal and/or t h ep osi-
tive step from t he Delaye d Swee p Stop circuit . Th ep ositive
o u t p
ut
gate is
cou p
le d to t he
Delayed Sweep Start M ulti .
Delayed Swee p Start M ulti . T he signal from t he Delayed
Swee p Trigger causes t h e Delaye d Swee p Start M ulti to fli p
so th at α positive gate is cou p le d to t he Delayed Swee p
Start Control, and α
negative gate
is a pp lied to t h e M ixe d
Swee p Comparator
.
T
he outpu
t gates
are
t he same i
n
d ura-
tio n
as t
he p ositive gate from t h e
Delayed Swee p Trigge
r .
Delayed Swee p Start Control . F or D L Y'D S WP mode of
o p eration the Delaye d Swee p Start Co n trol serves to couple
t
he
positive gate
from t he Delayed Swee p
Start Mu
lti
to
t he
Delaye d Sawtoot h Ge n erator a nd t he Sweep Gate
O
u t .
In p ut signals from t h e M ain Swee p Start Mu lti and t he
Delaye d Swee p L oc k out M ulti are not effective i n t h is
mo de .
Delaye d Sawtooth Gene r ator . T he d elaye d sweep sig n al
is develo ped by t h e Delaye d Sawtoot h Generator . T he saw-
toot h is ge n erate d d u ring t h e time t h at αp ositive gate is
applie d from t he Delaye d Swee p Start Co n trol . Rate of
chan ge of t h e sawtooth is set b y Ct a nd R t, selecte d by t he
ΤΙΜΕ /DI V (Dly' d ) switc h .
T he sawtoot h out pu t sig n al is coupled to t he M ixe d
Swee p Com p arator an d t he H oriz O u t p ut circuits .
Delayed Swee p Sto p Circ
u
it . Α positive ste p occurs at
t he outp ut of t he Delayed Swee p Stop circuit w
he n
t
he
d elayed sawtoot
h p asses t h ro ugh t h e level selected b y t he
Dly'd Sw p L engt h ad j u stme n t . T h is ste p is coupled to t he
Delayed Swee p Trigger and t he Delayed Swee p L ock out
Mu lti .
Delay Gate Am p . T h e positive gate from t h e Delay P ic k -
off
circuit is coupled t h roug h t he Delay Gate Am p to t he
Delayed Swee p Trigger b loc k .
Also, α n egative-going Delay
Gate sig n al is co up le d to co n nector
Β9 w hen t h e i n ter n al
M ai n frame Delayi ng M ode switc h (S59) is set
to any p osi-
tio n ot h er t han "I n d epend ent" an d t he DIS PL AY M
OD E
switc h is in any selectio n ot h er t han
MAIN SWP .
M ixe d Swee p M ode
E
xternal H oriz In p ut
Ci r cuit Description -71352
In t h is mo de of o p eration, t h e swee p is first r u nning at
t he MAIN S WP rate and t h e n, after t he selecte d d elay inter-
val, r un s at t he D L Y'D S WP rate . T h e mai n sweep an d
d elayed sweep are i n itiate d as previously d escri b e d . O p era-
tio n of ot h er circ u it b loc k
s
follows
.
M ixe d Sweep Comparato r . T
h
is
circuit d etermi n es
w h
ic
h sweep sig n al is coupled to
t h e H oriz O u t p ut stage .
F irst, t he main sweep
sawtooth is coupled t h ro ugh t he
M ixe d Swee p Com
p arator an d t h e Delayed Sawtoot h
Generator
to t
he H oriz O u t p ut stage . T h ese stages p erform
as
an
op erational amplifie r during t he time t h at t h e main
sweep is being dis p laye d .
Wh en αp ositive gate
from
t he Delaye d Swee
p
Trigger is
ap p lied to t he Delaye d Swee p Sta rt M ulti, α negative gate is
generated and couple d to t h e M ixe d Sweep Com p arato r .
T h is o p e n s t h e M ixe d Swee p Com p arator circuit, p reventing
the main sweep sawtooth f r om b ei ng
cou p
le d to t h e H oriz
O
ut p ut circ u it .
Simultaneously, t he positive gate from t he Delayed
Swee p Start M ulti is coupled t h roug h t he Delayed Swee p
Start Co n trol to t
he Delayed
Sawtoot h Generator
.
T
he
d
elaye
d sweep sawtooth is ge
n
erate d
a
nd coup le d to t he
H oriz
Out
p
ut
stage .
Delayed Swee p L ockout M ulti . T h ep ositive ste p from
t he Delaye d Swee p Sto p C kt is i n verte db y t
he
Delaye
d
Swee p L oc kout Mu lti and co up le d to t
he Delayed Swee p
Start Control, t
h
us
tur n i ng off t he Delaye d Sawtoot h
Generator .
Swee p Gate
Out . Depen d i ng on t h e selection of t h e
DIS PL AY M OD E switc h , t h is stage coup les t h e positive
gate from eit h er t he M ain Swee p Start Mu lti or t he Delayed
Swee p Start Co n trol to connector Α 1 . T h e Swee p Gate
signal serves to unb lan k t he C R T in t he I n d icator Oscillo-
sco pe du ri ng t h e swee p .
Wh en t he ΤΙΜΕ /DI
V switc h
is
set
to
A MPL, p art of t h e
M ai n Swee p
Trigger circuitry b ecomes t he H oriz In pu t
Am p . An exter
n
al sig
n al
con nected to
t
he MAIN TR
IG
IN
or A
MPL
in p ut
is am p lifie d a nd t hen coup le d to t he H oriz
Out p ut stage . T he main an d d elaye d sawtooth ge n erators
are d isa b le d to p reve n t i n te n sity mo d ulatio n of t h e CRT
trace b y t he unb la nk ing waveforms .
3-3