Tektronix 7B50 User manual

1 Ν ST F Z U C Τ 10 Ν
ΜΑΝ
V A L Serial Nu mber
ή :-! : ~ j

_3
c
7 Β50
TIME B AS E
Te k tr o n ix,
I
n
c .
S .
W . M illi k an W
ay
" Ρ .
Ο . Box 500
"
B eave r to n , Orego n 97005 " Ph
o
n e 644-0161 " Cables : Te k tronix
070-0975-00

1069

Ι " ι 1 αη U f ο ; ς:
f ι or the
Α ηΝ
r a n ty
up
-
A
i
Τ el,4ori
serv
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,ni,, are ' ν v crrcrc ί e
ir? σιη eη t .
with respect to
t he
ωα
r-
9io
ιι e d above should be ta k e
n
νου rΤ ekt ιοη l χ F ield
E nl
i n
eer
.
repair mind replacen~enl - part
'_ ιε ~
α
1'e d directly to the fiel d ,
έ here_'I ο re all re qu ests for repairs and re-
placement ρι - ι rts should be directed to tl~e
Tektronix F iel d G t
ί ξρ
or r e p ι e-s ύ r!t
r
_st ϊ ve
in your area . This p roce d u re will ass u re
you t h e fastest possible service . P lease
include the instr u me n t Ty p e a nd -Serial--or-
M o d
el N
u m ber with
all
re q u
ests
for p arts
or service
.
S p ecificatio n
s
an
d p rice c
han
ge
p ri
v
i-
leges reserved
.
Co p yrig h t

°'

1969
by-
Te k tronix,

Inc
.,
β eaverton, Orego n . P rinte
d in
t he
U
nite d
States of America .
All
rig
h ts reserved
.
Contents of t h is pu blication m ay not be
reproduced in any f orm , v it h out per m is-
sion of the
copyright owner .

TA BLE
O
F
CO
N TEN TS
S E CTIO N 1
S E CTIO N 2
Type 7Β 50
S PE CI F ICATIO N
Page
I n troduction
1-1
E lectrical C h aracteristics
1-1
Swee p R ate
1-1
Sweep Accuracy
1-1
Sweep L engt h
1-1
Swee p H old-Off Time
1-1
E xternal H orizo n tal Amplifier
1-1
Deflectio n F actor
1-1
Frequency R espo n se
1-2
Trigger Se n sitivity
1-2
Internal Trigger J itter
1-2
E xternal Trigger Input 1-2
L evel
R a n ge 1-2
Brig
h t Baseli n e 1-2
Ρ - Ρ Auto Sensitivity 1-2
E nviro n me n tal C h aracteristics 1-2
Altitude 1-2
Tran sportatio n 1-2
Ph ysical C h aracteristics 1-2
Finis h 1-2
W eig h t 1-2
Dime n sio n s 1-2
O PER ATI NG I N ST RU CTIO N S
General 2-1
Installatio n 2-1
Front Panel Co n tr ols and Connectors 2-1
Test Setu p Ch art 2-4
Ge n eral Operating Information 2-4
Swee p Cali br ation C h ec k 2-4
Simplified Operati ng I n st r uctions 2-6
N ormal Sweep 2-6
M agnified Sweep 2-6
Delayed Swee p 2-6
Pus h button Switc h L ogic 2-6
Triggere d L ig ht 2-6
Trigger M ode 2-7
Trigge r Cou p li ng 2-8
Trigge r Source 2-9
T r igger Slope 2-10
Trigger L evel 2-10
H orizo n tal Sweep R ate 2-10
Sweep Magnifier 2-12
H orizontal Position Cont r ol 2-12
Dis p lay M ode 2-12

Type
71350
TABLE
OF CONTENTS 
cont
SECTION
3
SECTION
4
Applications
2-13
Frequency
Comparison
2-13
Time
Duration Measurements
2-14
Determining
Frequency
2-14
Risetime
Measurements
2-1 ς
Delayed
Sweep Time Measurements
2-16
Delayed
Sweep Magnification
2-17
Pulsc
Jitter Measurements
2-18
Χ
-
Υ
Phase Measurements
2-19
CIRCUIT
DESCRIPTION
Introduction
3-1
Block
Diagram Description
3-1
Detailed
Circuit Description
3-3
Trigger
Preamp and Input Switching
3-3
Trigger
Generator
3-3
Input
Stage
3-3
Ρ
-
Ρ
Auto Stage
3-3
Slope
Comparator
3-3
Trigger
TO Stage
3-6
Pulse
Amplifier
3-6
Sweep
Gate Stage
3-7
Bright
Line Auto
3-7
External
Amplifier
3-7
Sweep
Generator
3-g
Disconnect
Amplifier
3-10
Sawtooth
Generator
3-10
Sweep
Start Amplifier
3-1 ρ
Sweep
Stop Comparator
3-1 ρ
Holdoff
Capacitor and Amplifier
3-10
Sweep
Holdoff Multivibrator
3-11
Reset
Control Amplifier
3-11
Sweep
Reset Multivibrator
3-11
Single
Sweep Operation
3-11
Alternate
Operation
3-11
Delayed
Sweep Operation
3-12
Horizontal
Preamp
3-12
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

TA BLE O F CO N T EN
TS

cont
A bb
reviations and symbols u se d in t h is manual a r
e base
don
or ta k en d i r ectly from IEEE
Stan d a r
d
260
"Sta nd a r d Symbols for Un its", M I L
STD-12B and ot h er stan d ards of the
electronics
industry .
C
h an ge i n formation, if any, is locate d
at th e rea r of t h is ma nu al .
Type 7 Β 50
Obtaining R eplacement P arts
4-6
Sol d ering Tec hn i q ues 4-7
Com p on en t R ep lacement 4-7
SECTIO N 5 PERF O RM A N C E C HE CK /CA L I BR ATIO N 5-1
Int r odu ction 5-1
Test Equ ipment R equ ire d 5-1
Sh ort F orm P rocedure 5-2
Performance C h ec k /Calibration P rocedure 5-4
Ge n e r al 5-4
Pr eliminary Control Setti n gs 5-4
Ch eck or A d ju st
L evel Cente
r 5-4
Ρ - Ρ A u to L evel R
a
n
ge
5-5
Internal Trigger Centeri
n g
5-5
L evel/Slo p e R ange 5-6
Trigger B and wi d th 5-6
E xte rn al Trigger I np ut Compe n sation 5-6
Swee p J itter 5-7
T r igger M od es 5-7
Sweep Cali b ratio n 5-8
M ag n ifie d Swee p Gain 5-8
M ag n ifier R egist r atio n 5-9
Swee p L en gt h 5-9
V aria b le Time/Div R a n ge 5-9
5μ s Timing 5-10
0 .2 μ s Timing 5-10
Sweep
Timing
Accuracy 5-10
M agnifie d Swee p Timi n g 5-11
Sweep I nh ibit 5-11
Am p lifie r V aria b le R ange 5-11
E xternal H orizo n tal Center 5-12
Am p lifie r Deflection F actor 5-12
Am p lifie r B and wi d th
5-12
SE CTIO N 6 ELE CT R ICA LP AR TS L IST
Abbreviations an d Sym b ols
P arts Or de r ing Information
In dex of E lectrical P a r ts L ist
S E CTIO N 7 DIAG R A M S A ND ME C HAN ICA L P A R TS I LLU ST R ATIO NS
Diag r ams
M ec h a n ical P arts Ill u strations (on r
everse si d e of Diagrams)
SECTIO N 8 ME C H AN ICA L P A R TS L IST
M ec h a n ical P arts L ist Information
In dex of M ec h anical P arts Illustratio
n s
M ec h anical P arts L ist
Accessories

Fig . 1-1 . Type7850Time Base .
GAWN-1 ."

Introduction
The Type
71350
Time Base unit is d esigned
specifically
for use with Tektronix Type 7500-Series Oscilloscopes ;
however, it is also compatible with all other 7000-Series
Oscilloscopes . The Ty p e 71350 features calibrated sweep
rates from 5 secon d s/ d ivision to 0 .05 microseconds/ d ivision
(5 nanosecon d s/division with MAGNIFIER at Χ 10), trigger-
ing
to 100 megahertz or vertical amplifier b an d width,
whichever is
less
and an external
h orizontal amplifier .
Sweep
rates may be
varied continuously
(uncalibrated) be-
tween calibrate d steps
. The sweep
free-runs p roviding α
S E CTIO N l
S PE CI F ICA ΤΙΟΝ
Ch ange information, if
any, affecting t h is section will be fou n d at t h e rea r of t h e ma n ual .
TABLE 1-1
ELECTRICAL C HARACTERISTICS
Type 71350
b right base-line in the absence of adeq uate triggering
signal
in Ρ - Ρ AUTO an d AUTO triggering mo d es .
The Performance
Check proce d ure given in
Section 5
provi d es α convenient
metho d of checking p erformance
of
this instrument . The
following electrical characteristics
apply at an ambient temperature
of 0 ° C to +50 ° C, unless
otherwise noted . W armup time for
given accuracy is 20
minutes .
Characteristic P erformance
Sweep R ate
Calibrated R ange 5 s/div to 0 .05 μ s/ d iv, steps in
α
1-2-5 se quence . Χ 10 magnifier ex-
tends swee p r ate to 5 ns/ d iv .
VARIABLE Continuously variable b etween cali-
Range
brate d steps . Extend s sweep rate to
at least 12
.5 s/div .
Sweep Accuracy Measure d in 7500 series
mainframe .
Calibrated with mainframe
calibra-
tor .
Time Interval +15 ° C to
+35
° C 0 ° C to +50 ° C
Over Center Unmag Mag U nmag Μα g
8 d iv
5 s/ d iv to 0 .1
s/div an
d
0 .2
μ s/div to
3% 3 .5% 4% 5%
0 .05
μ
s/div
50 ms/div to
2%
2 .5% 3% 4%
0 .5 μ s/ d iv
Over any 2 d iv
interval within 5% 7%
center 8 div
Characteristic Performance
E xclu d
e following Start of Sweep En d of Swee p
p ortions of
Magni-
first 50 ns
b eyon d t he
fle d
Sweep
100th d iv
Sweep L ength 10 d ivisions to 13 divisions
Swee p Hold -Off Time
5 s/Div to 1 .5 times the ΤΙΜΕ /DIV setting or
5 μ s/Div
less .
2 μ s/Div
to
3
.5 microseconds or
less
.
0 .05 μ s/Div
External H orizon-
tal Amplifier
Deflection Factor
ΕΧΤ
V A
R IA BLE 90 millivolts/ d ivision wit h in
10
fully cloc k -
millivolts/divisio n
wise
ΕΧΤ =
10
VARIABLE 900
millivolts/division within 110
Fully clock-
mill ivolts/clivision
wise
VARIABLE At least 10 to 1
R ange

Specificatio n -Ty pe71350
' Οη i n te rn
al
triggeri n g
only,
t
h
e
s p ecifie d -3 d B fr e qu en cy of t he
vertical
system re p laces any
fr
e qu e n cies i n
t
heab ove ta b le w h e n t he
nu m b e r in
t
h e table is g r eate r t han
t
h
e vertical am p lifie r up pe r -3
dB p oi n
t .
E
xternal Trigge r
In pu t
M aximum I np ut
V oltage
In pu t R a n dC
L evel R an ge (ex-
clu d i n g Ρ - Ρ
AU TO)
B rig h t B ase- L ine
Ρ - Ρ A U TO O p e r a-
tion
Sen sitivity
Altit ude
Non-Operating
Tran s po r tatio n
F i n is h
2 W ill n ot
t r igge
r
on
si n e
waves of 3 d ivisio n s o r less i n te rn al o r 1 .5
volts exte rn al b elow 120 H ertz .

W e i g h t
C h aracteristic
ΕΧΤ
ΕΧΤ = 10
ENV I R O NMENTA L CHA R ACT ER ISTICS
C h aracte r istic
C h aracteristic
Dime n sions
500 V (DC
+
P ea k AC) . 500 V Ρ - Ρ
AC at 1 k ilo h e r tz or less
1 mego h m with in 2% ο , 20 p icofa r a d s
wit h in 2 picofara ds
At least +3 .5 volts to -3 .5 volts
At least +35 volts to -35 volts
Swee p free-ru ns in ab sence of trig-
gering signal i n A U TO and Ρ - Ρ
A U TO
0 .5 d iv internal, 250 m V exte rn al
200 Hz to 10 MH z . 1 .5 d iv internal,
750 m V external 10 MH z to 100
MH z
TA BLE 1-2
TA BLE 1-3
P erformance
P erfo r mance
To
50,000 feet
an d -55 ° C
Q u alified
un d er N ational Safe T r an -
sit
Committee test p roce du re 1 Α ,
Category Ι Ι
PH YSICA L CH A R ACT E R ISTICS
P erfo r mance
F ro n t Pan
el is a no d ize d aluminum
14 1/4 i n c h es long
by 2 5/8 inc h es
wi d e b y 5 inc h es h ig
h overall
A b o u t 1 3/4 p ound s
Ch a r acteristic
P erformance
N ominal
F re quency R es p on se System -3dB p oi n ts in 7500-series
oscillosco
p es
L ower -3dB U pp er -3 dB
AC
16
H z
500 kH z
AC LF REJ
70 k H
z
500 kH z
AC HF REJ 16 H z 100 kH z
DC DC 500 kH z
Trigger Sensitivity Triggeri n g M inimum Trig-
F requency gering Signal
Ran ge' R e q uired
Cou p li ng
ΙΝΤ ΕΧΤ
AC 30 H z to 0 .3 Div 150 m V
10 MHz
10 MH z to 1 .5 Div 750 m V
100 MH z
AC
LF REJ 30kH z
to
0 .3 Div 150 m V
10 MH z
150 kH z to 150 m V
10 MHz
10 MH z to 1 .5 Div 750 m V
100 MHz
AC HF REJ Z
30 Hz to 0 .3 Div 150 m V
50 kH z
DC DC to 10 MHz 0 .3 Div 150 m V
10 MH z to 1 .5 Div 750 m V
100 MH z
Si n gle Sweep Triggering re qu irements
same as
no r mal swee p . Wh en triggere d ,
swee p generato r p ro du ces o n e
swee p only .
Internal T r
igger
1 nanosecon
d or less at 75 mega-
J itter h ertz

General
T h e Type 71350 p lug-in unit op erates with α Te k tronix
7000-series indicator oscillosco p e and α 7A-series vertical
p lug-in unit to form α co mp lete oscillosco pe system . To
effectively use t he Ty p e 71350 its op eration and ca p abilities
s h ould be known . T h is section d escri b es the o p eration of
t he front- p anel controls, gives first-time an d general o p er-
ating information an d lists some basic a pp lications for th is
instrument
.
Installation
T he Ty pe 71350 is d esigne d to o p erate i n t h e h orizo n tal
p lug-in com p artments of Tek tronix 7000-series oscillo-
sco p es . T h e Ty p e 71350 can also be installe d in α vertical
p lug-in com p artment to provi de α sweep t h at runs vertically
on t he CRT . However, w h en use d in t h is manner, t h ere is
no retrace bla nk ing or internal triggering p rovision an d t he
unit may not meet t he s p ecifications given in Section 1 .
T he instructions in t h is manual are written for use of t he
Ty p e 71350
in
α
h orizontal p
lug-in com p artment of t
he
oscillosco pe .
Wh
en t he Ty pe 71350 is use d with an oscillosco p e w h ic h
h as
two
h
orizontal p lug-in com p artments, install th is unit in
T he Β
(rig h t)com partment . T h en, if α
d elaying-swee
p
unit is
installe d
in t h e Α (D EL AYI NG TIME BAS E ) com p artment,
d elaye d -swee p op eration is available . T h e Ty p e 71350
will
operate p r op erly
i n
t
he Α com p artment for all h o r izontal
mo d es of op
e r
atio
nexce p td elaying sweep .
To
install t h e Ty p e 71350 into α p lug-in com p artment,
p us h
it in until it fits firmly into t he in d icator p lug-in com-
p artment . To
remove, pull the release latc h (see F ig . 2-1) to
d isengage t he unit from
t he indicator an
d pull
it out of t he
p lug-in com partment .
Even th
oug
h
t h
e h orizontal gain of
t he in d icator oscillosco p e is stan d ar d
ize
d to minimize
ad j ustment w h en inserting p lug-in units, t h e sweep calibra-
tion of t h e Ty p e 71350 s h oul d be ch ec k e d w hen it is
inserte d into t h e in d icator to verify measurement accuracy .
T h e p rocedure for ch ec k ing t he u nit is given und er Swee p
Cali b ration C h ec k in t h is section .
FR O N
T-
P
A NEL CO NTR O LS AND CO NNE CTO RS
General
S
E
CTIO N 2
O
PER ATI N G I N ST RU CTIO N S
Ch
ange information,
if
any,
affecti
n g
t h is sectio n will be fou nd at t h e rear of t h e manual .
All controls re q uire d for the o p eration of t h e
Ty p
e
71350
are locate d on t he front p anel of t he unit
(see
F
ig
.
2-2)
.
To
ma k e full use of the ca p abilities of t h is
instrument, t h e
Fig . 2-1 . L ocatio n of release latc
h .
Triggering Controls
Type 71350
ope r ator s h oul d be familiar wit h t h e functio n an d use of
eac h of t h ese controls . Α brief d escri p tion of t h e front-
p anel con trols an d connector is give n h ere . M ore d etaile d
information is given un d er General O p erati ng Information .
LEVEL /S L O PE

Selects t h e am p litu dep oint and
slo p e of trigger signal on w h ic h t h e
sweep is triggere d . Wh en t h e in d ica
tor line on t he
outer ring is to t h e
left of center, t he sweep is triggered
on t he p ositive-going slo p
e
of
t he
trigger signal, as
sh own
by
t he
p
ositive-going waveform . To t he
rig h t of center, t he swee p is trig-
gere d on t he negative-going slo p e of
t h e trigge r signal as s h own b y t he
negative-going waveform .
TR IG'D

L ig h t in d icates t h at t h e swee p is
triggere d an d will p ro du ce α d is p lay
with correct setting of t he POSI
TION
control and t he controls on
the
associate
d
vertical unit and in d i-
cator oscilloscope .

Operati ng Instructio n s-Type
71350
MOD
E
2-2
Series of push -button switc h es to
select
t he trigger mo d e . Selected
mo d e is in d icate
d by lig h te d but-
ton .
Ρ - Ρ A U TO : Swee p automatically
triggere d at p oint selecte d by t he
LEVEL/SLOPE control w h
en
the trigger signal re p etition rate
is above about 200 h ertz an d
wit h in t h e fre q uency range
selecte d by t he CO UPL I NG
F ig .
2-2
.
F ro n t- P anel cont r ols a n d co nn ector .
switc
h . Triggere d swee p can be
obtaine d
t
h
roug hout t he entire
range of th e
LEVEL /S L O PE
control . Wh en the trigger
re p eti-
tion rate is below
t he
lower
fre-
q uency limit (or above upp
er
limit for AC HF REJ)
or w hen
t he trigger signal is ina
d
eq
uate,
t he sweep free runs at t h e swee p
rate selecte d by t he ΤΙΜΕ /DI V
switc h to pro d uce α reference
trace .

A U TO : Swee p i
n
itiated by t he
ap p lie d trigger
signal at poi n t
selected by t he LEVEL /S L O PE
control w hen t he tr igger sig n al
repetition rate is aboveabout 30
h ertz and with in t he fre q uency
ra n ge selecte d by t h e CO U -
PL I N G switc h . Triggere d sweep
can be ob taine d only over t
h e
amplitu de ra
n ge of t he app lie d
trigger
signal . Wh en t he LEVEL
/
SL O PE control is outsi de
t he
amplitude range, t h e
trigge r
re p etition rate is b elow t
he
lowe r fre q uency limit (or
above
u pp er limit for AC
HF REJ) or
the trigger sig n al is
inade q uate,
the sweep free r uns at t h e swee p
rate selecte d by t he ΤΙΜΕ /DI V
switc h to p ro duce α refere n ce
trace .
N
O
RM : Sweep i n itiate d b y t h e
applie
d trigge r signal at any
p
oint selected by
t h e LEVEL /
SL O
PE control ove r t he fre-
q uency
range selecte d by the
CO
UPL I N G switc h . Triggere d
swee p can be o b tai n e d only over
the amplitu de range of t he
a pp lie d trigger signal . Wh en the
LEVEL /S L O PE control is out-
si de t h e am p litu d e ra n ge, the
trigger repetitio n rate is outside
t h
e fre q
uency
range selecte d by
t h e CO UPL I N
G
switc h or
t he
trigger
signal is inadeq u ate,, t h ere
is
no
trace .
SI NG LE S WP : Swee p initiated by
t h e app lie d trigger signal at any
p oi
n t selecte db y t he LEVEL
/
SL O
PE
con
trol over t he fre-
quency
ra n ge selecte db y t h e
CO
UPL I NG switc h . Triggere d
swee
p
can be
obtai ned only over
t h e am p litu de range of
ap p lie d
trigger sig n al . After t he first
swee p is dis p layed, f u rt h er
swee p s ca nn ot be p rese n te d until
t he RE SE T- RE ADY pu sh-
bu tto n is presse d . Wh en t he
LEVEL /S L O PE con trol is out-
side the am p litude range, t he
trigge r repetition rate is o u tsi de
t he freque ncy range selecte d by
t he CO UPL I N G switc h , the trig-
ger sig n al is i n ade q uate or w h en
t he RE SE T- RE ADY lig ht is off,
t h ere is no trace .
CO
UPL I N G
SO UR C E
O p
erati ng I n structions-Type 71350
RE S ET- RE ADY : Pu sh -b u tton to
reset t he Sweep
Generator fo r
t h e next sweep
in t he single-
swee p mo de .
T he RESET-
READY butto n
remains lig h ted
to in d icate t h
at t h e unit is r eady
to be triggere
d . After t h e unit is
triggere
d
a n
d αsweep is com-
p leted,
t he RE S E T- RE ADY lig h t
goes
out un til the butto n is
p resse
d agai n .
Se r ies of push -b u tto n switc h es to
select the trigger cou p ling . Selecte d
coupling is i n d icated by lig h ted
button .
AC : Rejects DC an
d
atte
n uates AC
sig
n als
b elow abo u t 20 h e r tz .
Acce p
ts
sig n als between 30 h ertz
a
nd 100 mega h ertz .
AC LF REJ : Re j ects DC an d atte n -
AC HF REJ : Acce p ts sig n als b e-
twee n about 30 h ertz a nd 50
k ilo h ertz . Re j ects DC an d atten-
uates sig n als outsi d e t h is fre-
q uency range .
DC : Acce
p
ts all
trigger signals from
DC to
100 mega h ertz .
Series of push -butto n switc h es to
select the trigge r source . Selecte d
source is in d icate d by lig h ted
button .
ΙΝΤ : Trigger signal obtaine d inter-
nally f r om α vertical un it .
L I NE : Trigger signal o b taine d
i n ternally from α sam p le of t h e
line voltage a pp lie dto t h is
i n strument .
ΕΧΤ : Trigger signal obtaine d from
an external signal applied to t h e
ΕΧΤ T R IG IN conn ector .
ΕΧΤ
-
10 : Trigger signal o b taine d
from an external signal a pp lie d
to t he ΕΧΤ TR IG IN connector
as in t he ΕΧΤ p ositio n . In t h is
p ositio n t he exter n al signal is
attenuate d 10 times before it is
a pp lie d to t he trigger circ u it .
u ates sig n als b elow a b out 30
kilo h ertz . Acce p ts signals be-
tween 30 k ilo h ertz and 100
mega h ertz .

Ope r ati ng Instructions-Type
71350
ΕΧΤ T R IG IN or

Input
conn ector for exter n al trigger
ΕΧΤ V O L TS IN

signal
or amplifier input sig n al .
Swee p Controls
P
OSITIO N
F I NE
ΤΙΜΕ /DI V
V
A R IA BLE
M AG N I F I
ER
S WP CA L
2-4
Controls h o r izo n
tal
p
ositio n of dis-
play .
P rovi d es
more p recise control of
h orizontal positions
.
Selects the basic swee p rate of t he
output sawtoot h . T he V A R IA
BLE
con trol must be in cali b rate
d p osi-
tio n and M AG N I F I E D switc h
set to
Χ 1 for in d icated swee p r
ate .
Two-position switc h
act u ate db y
t he V A R IA BLE
kn o b to select cali-
brate d or
uncalibrate d swee p rates .
At t h e in
position, t h e V A R IA BLE
control is i n operative
an d t h e swee p
rate is calibrated
. Wh en p resse d an d
released, t he k nob moves
ou t to
activate the V A R IA BLE
control for
u n cali brate d sweep rates . T he
swee
p rate in eac h ΤΙΜΕ /DI V
switc h p
osition can be re d uce d to
at least t he
swee p rate of the n ext
a d j acent p osition,
to provi de con-
tinuously va r iable swee
p rates from
5 n anosecon d s/ d ivision
(X10-
MAGNIFIER
on)
to
about 12 .5
secon d s/division, wit h M
AG
N I-
F I ER at Χ 1 .
P us h -b u tton switc h es to select
t he
h orizo n tal magnification
. T he
Selecte d mag n ification is in
d icate d
b y α lig h te d b utton .
X1 :Magn ifie
d swee p at t h e basic
sweep
rate i nd icated by TIME/
DI
V switc h .
Χ
10 :
M
agnifie dsweep at αswee p
rate 10 times faster t han t he
basic sweep rate i n d icated by t he
ΤΙΜΕ /DI V switc h . T he p ortion
of t he normal sweep with in t he
center division of t he graticule is
t he p
ortion s h own in magnified
form
.
Screwd r iver
ad j ustme n t to set
am p litu d e of
t h
e
output sawtooth .
Dis p lay M od
e
TIME B AS E Selects
swee p rates
as d etermine d
b y
ΤΙΜΕ /DI V switc h .
A MPL I F I ER

Dis
p
lays signals app lie
d to t h e ΕΧΤ
T R IG
IN
or ΕΧΤ V
O L TS IN con-
nector . Select T R IGG ER I N G
SO UR CE and
CO UPL I N G .
V A R IA BLE

V
aries d eflectio n factor
by α factor
(am p lifie r)

of 10 .
General
Swee p Calibration
C h ec k
T E
ST S ET UP C HAR T
F ig . 2-3
sh ows t he front pa n el of t he Ty pe 71350 . T h is
ch art can
be re p roduce d and use d as α test-set up
recor d for
special
measurements, applications or procedu r es,
or it may
be use d as α traini ng ai d for familiarization with
t h is instr u -
me n t .
G ENER A L O PER
ATI N G I NF O RM ATIO N
Wh enever
the Ty p e 71350 is i n serte d into
α plug-in com-
p artment
ot h er than t he one i n w h ic h it
was calib r ated, t he
swee p
calibration s hou ld b e ch ec ked
an d rea dju ste d if
necessary .
Allow five minutes warmu p
before p erformi ng
t h is p r oced ure .
1 . Connect
α one- k ilo h ertz calibrator sig
n al from the
In d icator Oscilloscope Calibrator to
t he V ertical unit in p
ut
con n ector .
2 . Set t h e ΤΙΜΕ /DI V switc h
to
1
ms an d
press
t he top
TR IGG ER I N G and DIS
PL
AY M
OD E pu s h buttons .
3 . Set t h e V ertical unit to
d is p lay at least two
d
ivi-
sio n s of t h e signal vertically .
4 .
C heck t he CR T d is p lay for one complete
cycle p er
d ivision .
5 . If necessary, ad j ust t he S WPCA L
ad
j
ustme
n
t for one
com
p lete cycle p er d ivision .
Sim p lifie d
O p erating Instructions
T he
following informatio n is p rovi ded
to aid in q uic k ly
obtaini ng
t he cor r ect setti n gs
for
t
he Type 71350 to

7 Β 50
T E
ST S
E T- UP C H A R T
F ig . 2- 3 .
O p erating Instr u ctions-Type 7 Β 50

O p erating Instructions-Type 71350
p r esent α display . T h e op erator s ho u l d
be
familiar
with t he
com p lete fu n ctio n and o p e r ation of t h e u nit
as d
escribe
d
i
n
t h is sectio n before usi ng t h is p r oce du re .
Normal Swee p . T he followi ng proce
d ure will provide α
sta b le d is p lay for most normal-sweep a pp licatio n s .
1 . Select the TR IGG ER I NG M OD E , CO UPL I NG an d
SO UR C E w h ic h fit t h e r equi r eme n ts of t he sig n al to be
d isplayed .
2 . Turn t he LEVEL /SL O PE control to t h e d esired
slo p e .
3 . If
t
he
green
T R IG'D lig h
t
is not on, ad j ust the
LEVEL /S L O
PE control t h ro ugh out the range of t he
selecte d slope until t he T R Ι G'D lig h t comes on . If t he lig h t
d oes not come on at an y setting of t he LEVEL /S L O PE
co n trol, t he trigge r signal is inade q uate or t he CO UPL I NG
an d SOUR C E switc h es are set incorrectly .
4 . Set the
ΤΙΜΕ /DI V switc h an d P OSITIO N control for
α d is
p lay w h ic h remains
on
t h e d is p lay area h orizo n tally
(V A R IA BLE cont r ol s h oul d b e i n CA L position for cali-
brate d swee p
rates) .
5 . If t h e d is p lay d
oes not start at t h e correct point
on
t he waveform, rea d j ust t
h e LEVEL
/S
L
O
PE control for the
d esired trigge r i n g .
M ag n ifie d Sweep . Α magnifie d -swee p d is p lay can be
obtaine d as follows after α normal-swee p d is p lay is obtaine d
as given in ste p s 1-5 above .
1 . A dj ust t he P OSITIO N control to move t he area to be
magnifie d with i n t he center d ivision of t h e C R T .
2 . If n ecessary, ch ange t he ΤΙΜΕ /DI V switc h setting so
t he com p lete area to b e magnified is wit h in the cente r
d ivisio n .
3 . P ress t h e X10-MAGNIFIER pu
s
h
-button .
4 . U se t h e fine range of t he P OSITIO N control to esta b -
lis h p r ecise p ositio n i n g of the mag n ifie d display .
Delayed Swee p . T
he following proce du re can be used to
obtai nα delaye d -sweep
display w hen t h e Type 71350 is use d
2-6
i n an oscillosco p e t h at h
as
d
ual time b
ase
ca
p
abilities an d
w hen use d wit h α com p anio n d elayi n
g-swee p unit ( Α ) .
O b tain α d is p lay as given in ste p s 1-5 un de r N ormal
Swee p .
T hen p
rocee d as follows :
1 . P ress t he Β
STA R TS A F T ER D EL AY push -b u tton
on t he Α time-base .
2 . Set t h e i n dicator oscillosco p e h orizontal
mode to dis-
play t he Α time base .
3 . Set t he ΤΙΜΕ /DI V switc h of t h e
Type 71350 so t h e
intensified zone
on
t he d isplay is t he desire
d le n gt h (i n te n si-
fie
d zo ne will be d is p laye d in delaye d
form) . If t he intensi-
fied zone is not visible, a dj ust t he in
d icator intensity
controls .
4 . A d j ust t he Α
time-base D EL AY TIME MUL T
dial to
p ositio n t he i n
tensifie dzone to t h e p ortion of t h e
d isplay
to be d elayed
.
5 . Set t he in d icator oscillosco pe h orizo
n tal mode to dis-
play
t h
e Β time base (Type 7 Β 50) .
6
.

If
α delaye dswee p wit h less j itter is
desired, p ress the
Α time-base
ΒTR IGG ER A BLE A F
T ER D EL AY p us h -
butto n . T he
triggeri ng controls of t he Ty pe
71350 m u st be
set to obtain α stable
d isplay .
P us h button
Switc hL ogic
the T R IGG
ER I N G M OD E , CO UPL I N
G and SOUR C E
switc h es and t he
DIS PL AY M OD E switc h
are ar r an ge d i nα
se q uence w h ic h p
laces t he most ofte n -use d positio
n at t he
to p of eac h series of p
us h buttons . W it h t h is arrangeme
n t, α
stable normal-sweep d
is p lay can usually be obtai nedb
y
p ressing t he to p p
us h - b uttons ; Ρ - Ρ AU TO,AC, ΙΝΤ
an d
TIME BAS E . Wh en
an
a
de qu ate trigger signal is app lie
d , t he
u nit is triggere d as in d
icate d by t he illumi n ated T RIG'D
lig
h t at any setti ng of the
LEVEL /S L O PE control .
If t h e
T R IG'D lig h t is n ot
on, eit h e r t he t r igger signal
a pp lie d to
t h is unit from the
vertical unit is ina deq uate
or it is below
t he lower
frequency limit of the
ACCO UPL I N G switc h
p ositio n . If
t he d esire d d isplay is
not obtaine d wit h t he
push buttons
pushed in, ot h er
selections must be ma de .
Refer
to t he following discussio
ns or t h e instructio n
manuals
for t he associate d in d
icator oscillosco p e an d
verti-
cal unit
for
more i n formation .
Triggered L ig h t
T he T R IG'D lig h t p rovides α con ve n ie n t i nd icatio n of
t he con d ition of t h e triggering circuits . If t h e T R IG-
G ER I NG controls are correctly set an d an a d equ ate tr igger
sig n al is app lied, t h e T R IG'D lig h t is on . U
nde r ce r tai n

con d itions, t h e T R IG"D lig h t may be
off, indicati ng th at
t h e swee p is not triggered . T
he cause mig h t be α misad-
j usted LEVEL /S L O
PE
con
trol, incorrectly set CO UPL I NG
or SO UR CE switc
h es, low trigger signal am p litu d e, or α
trigger signal re
p etition rate outside t he acceptable fre-
q uency
range .
T h is
feature can be used as α general indica-
tion of correct
trigge r ing . It is particularly useful w hen
setting up t h e
trigger circuits w h en α trigger signal is avail-
a b le without α d
is p lay
on
the CR T . It also indicates t h at
t h is unit is
correctly triggered w h en op erati ng as α d elaye d -
sweep unit ( Β ) .
Trigger M od e
T he p us h buttons located und er t he M OD
E title (see F ig .
2-4) select t h e mo d e in w h ic h t he sweep is triggered . T
h e
selecte d mo d e is in d icated b yα lig h te d pushbutton .
Ρ - Ρ A U TO . Wh en t he Ρ - Ρ A U TO pushbutton is p resse d ,
α triggere d d is p lay is p rovi de d at any setti n g of t he LEVEL /
S L O PE control w h enever an adeq uate trigger signal is
a p plied . Th e range of the LEVEL /S L O PE control in t h is
mode is between about 10% οan d 90% ο of t he p ea k -to- p ea k
amplitu d e of t he ap p lied trigger signal . T he LEVEL /S L O PE
control can be set so t he d is p laye d waveform starts at any
p oint wit h in
t h is range on eit h er slo pe . In t he Ρ - Ρ AU TO
mo d e, the trigger circuit automatically
com p ensates for
ch anges in trigger signal am p litude for signals above t he
minimum amplitude re quirement . T h erefore,
if
t
he
LEVEL /S L O PE control is set so t he d is p laye d
waveform
starts at α certain p ercentage-point on t he lea d ing ed ge of α
low-amplitude signal, it triggers at t h e same percentage-
F ig . 2-4 . Exp lo d e d view of front pa n el s h owi ng pu s h
-butto
n
s asso-
ciate d wit h t h e MOD E , CO UPL I NG a nd SO UR CE switc h es .
Operating I n structio
n s-Ty p e 71350
p oint on t he leadi ng ed ge of α h ig h-am p litu d e sig n al if t he
LEVE L/S L O PE εοητ r οΙ is not ch
a
nged
. T
h is
o p
eration is
illustrated in F ig . 2-5 .
Wh en t he trigger re p etitio n rate is b elow a b out 200 h e r tz
(or outsi d e t he fre q uency range selecte d b y t he
CO
UPL I NG
switc
h ),
or
w
hen t h e trigger
signal
is
ina
de
q uate,
t h e sweep
free runs at t he sweep rate in d icate d b y t he ΤΙΜΕ /DI V
switc h to p ro d uce α reference trace (T R IG"D lig h t
off) .
Wh
en an ade q uate trigger signal is agai n a p plie d , t he free-
ru nn ing con d ition end s an d α t r iggere d d is p lay is p resented .
T h e Ρ - Ρ A U TO trigger mo d e is particularly useful
whe n
observi n gα series of waveforms, since it is n
ot
n ecessary to
reset t h e LEVEL /S L O PE control for eac h
ob servation .
Also, because of t he ease of ob taini n gα triggere d d
isplay in
t h is mo d e, t h e Ρ - Ρ A U TO t r igger mode
can be used for
most a pp lications and t he remaining
mo d es used only for
s p ecial
ap
p
lications .
A U TO .
Wh en t he AU TO p us h -butto n is illuminate d , α
triggere
d dis p lay is presente d wit h t he correct setting of t he
LEVEL
/S
L
O
PE
con trol (see Trigger Level d iscussion)
w hen ever an a de q uate
trigger signal is a pp lied . T h e range of
t he LEVEL /S L O PE con trol in
th is mo de is ±8 vertical d ivi-
sions . T he T R IG'D lig ht in d
icates w hen t he dis p lay is
triggere d .
Wh e n t he trigger re p etitio
n rate is belowabout 30 h ertz
(or outsi d e t he fre q uency
r a n ge selecte d by t h e CO UPL I N G
switc h ) or w h en t he trigger
signal is ina d eq uate, t h e swee p
free runs
at t h e sweep rate i nd icate d b y t he ΤΙΜΕ /DI V
switc h to p
ro duce α reference trace (T R IG"D
lig h t off)
.
W hen an ade qu
ate trigger signal is again a pp lied,
t he free-
running con d ition end
s an d α triggered d is p lay is p resented
.
Wh en t h e LEVEL
/S L O
PE
control is at α setting outsi d e t he
am p litu d e range
of t he trigger signal, t he sweep also free
ru n s at t
he swee
p
rate in d icate dby t he ΤΙΜΕ /DI V
switc h .
T h is
type of free-run n ing d isplay
can
b e
useful
w
hen it is
desire
d to measure only t he maximum p ea k -to- p
ea k am p li-
tude
of α signal with out o b servi ng t he waves hape
(suc h as in
ban d wi d t hmeasurements)
.
N O RM .
Wh en t he N O RM push -button is p resse
d , α trig-
gered dis p lay is p
resented with t he correct setting of t he
LEVEL /SL O PE control w h enever
an adeq uate trigger signal
is applie
d . T he range of t he LEVEL
/S
L O PE
control in t h is
mode is ±8 vertical divisions . T he TR IG'D lig h t in d icates
w h en t he dis p
lay is triggere d .
T h e N O RM trigger mo d e
must be use d to p ro duce trig-
gere d d is p lays with t r igger re p etition rates
below about 30
h ertz . Wh en t he LEVEL /S L O PE
control is at α setting out-
si d e t he am p litu de range of t he
tr
igger
signal, w h en t he
2- 7

Ope r ati ng Instr u ctions-Type 71350
F ig . 2-5 . LEVEL /S L O PE co n trol ope r atio n for (P-P) AU TO mo d e triggeri n g . ( Α ) LEVEL /S L O PE co n t r ol set so d is p layed wavefo r m sta r ts at
abou t 25 ο / ο p oi n t of α on e- d ivisio n wavefor m . ( Β ) d is p laye d waveform still triggere d at a bo u t 25 ο
/
ο of lea d i n g ed ge, w h e n sig n al a m plit ud e
i nc r eases, to pr odu ce αfour-division dis p lay (LEVEL /S L O PE co n trol at sa m e setti ng for bot h wavefo rm s) .
trigger re p etitio n rate is outside t he fre q uency r ange
selecte d by t h e CO UPL I N G switc ho r w h en t h e trigger
sig n al is i n ade q uate, t he r e is no trace (T R IG"D lig h t off) .
SI NG LE S WP . Wh en t h e signal to b e d isplayed is n
ot
re p etitive
or varies
in am p lit u d e, waves hape
or re
p etition
rate,
αcon
ve n tional repetitive
ty p
e
d is p lay may p ro duce an
un stable
p
rese n tation . Α sta b le d is p lay can often b e
o b tai ned unde
r
t h ese circumstances b y using t h e si n gle-
sweep featu
r
e of t h is un it . T he SI NG LE S WP M OD E is also
useful to p h otogra p h non-repetitive or unsta b le displays .
To ob tai nα si n gle-sweep d is p lay of α re p etitive sig n al,
first o b tain the best p ossi b le d isplay i n t he N O RM M OD E .
T h en with out cha
n
gi
ng
t he ot h er T R IGG ER I NG con trols,
p r ess
the SI
N
G LE S WP pu s hbutton . Wh en r eady to view
t he si n gle-swee p
d is p lay, press the RE SE T- RE ADY pu s h -
butto n .
Α single trace is p resented eac h time t he RE SE T-
RE ADY pus hbu tto n
is p resse d (as long as t he r e p etitive
signal remains connecte d to t he system
and T R IGG ER I N G
con trols are correctly set) a
nd
fu
r th er sweep s ca nn ot be
p resented u ntil t h e RE SE T- RE ADY
p
us hb
utton is p resse d
again . If t he dis p laye d sig n al is α com p lex waveform
com-
p ose d of p ulses of va r ying amplitu d e, successive si
n gle-
swee p d is p lays may not sta rt at the same p oint of
t h e wave-
fo r m . To avoi d confusio n due to t h e C R T p
ersiste n ce,
allow
t he d is p lay to decay b efore p ressing t h e RE SE T- RE ADY
pu s hb utton agai n . At fast sweep rates, it may b e d ifficult to
view t h e single-swee pd is p lay . T h e apparent tr ace
i n tensity
can be increase dby re d ucing the ambie
n t lig h t level or
using α
viewi ng h oo d as recommen ded in t he in d icator
instruction manual .
Non-repetitive, ran d om sig n als
can
be d isplayed in
t he
single-sweep
mo d e by first obtaining t he best p ossi b le
dis-
play in t h e NO RM
M OD E with α sig n al w h ic h is about t he
same am p litu de an d f r e quency
as t he ra n dom signal . T hen
without ch anging t he ot h
er T R IGG ER I NG co n t r ols, p ress
t h e SI NG LE S WP p us hb u tton .
Wh e n rea d y for the ran d om
signal, press t he RE SE T- RE ADY p
us hb utton . T h e RE S E T-
RE ADY push butto n remains lig h
te d to i n d icate t h at t he
unit h as been reset a n d is rea d y
to p ro d uce α sweep . T h e
lig ht goes out after t he ran d om sig n
al triggers t he unit . To
p r ep are t he unit for an ot h er
si n gle-swee
p
display, p ress t he
RE S E T- RE ADY pushbu tto n
agai n .
Wh en using t h e single-swee p mo d e to p h
otogra ph wave-
forms, the graticule must b e p h otogra p hed se p
ar ately i n t he
normal manner to p reve nt ove r -ex
p osing t he film . Be s u re
t he camera system is well protecte
d agai n st stray lig h t, o r
op erate the system in αd
ar kene d room . F or re p etitive
waveforms, p r ess t h e RE
S
E
T- RE ADY p ush b u tton only
once for each waveform
unless t h e sig n al is com p letely
symmetrical . Ot h erwise,
multiple waveforms may appea r on
t he film . Fo r
ran d om
sig
n als, t h e camera lens can b e left
open u n til t h e
ran d om signal triggers t he unit (
RE
SE
T-
RE ADY p us hb
utton lig h te d ) . F urt h e r information
on
p h otogra ph ic tec h ni q
ues is given i n t he camera i n
structio n
ma n ual .
Trigger Cou p ling
T he pus hb utto ns
locate d below t he CO UPL I NG title
(see F ig . 2-4) select t he met h
od in w h ic h t he trigger signal is
conn ecte d to t he trigger circuits . T he
selecte d cou p ling is

i n dicated by αlig h te d pus hb utton . E achposition permits
selectio nor re j ectio nof t h e frequency com p onents of t h e
trigge r signal w h ic h trigger t h e sweep . F ig . 2-6 gra ph ically
illustrates the band of frequencies covered by each p ositio n
of the CO UPL I N G switc h .
AC . In t he AC position of t he CO UPL ING switch , t he
DC component of the trigger signal is bloc k ed . Signals wit h
low-frequency com p onents below about 30 h ertz are atte n -
uated . In general, ACCO UPL I NG can be used for most
a pp licatio n s . H owever, if t he signal co n tains un wanted fre-
quency compo nents or if t h e sweep is to be triggered at α
low repetition rate or DC level, one of t he remaining CO U -
PL
I NG switch positions will provide αbetter display .
T
h e triggering point i n t he AC position de p ends upon
t he average voltage
level of t he t r igger signal . If t h e trigger
signal occurs
randomly, t he ave r age voltage level will vary,
causing t h
etr
igge
r
ing point to va
r y also . T h is s h ift of t he
triggering point may be
en oug hso it is im p ossible to mai n -
tain α stable disp lay . In
such cases, use DC cou p ling .
AC LF REJ . In the AC LF REJ position, DC is re j ected
and low-frequency trigger signals belowabout 30 k ilo h ertz
are attenuated . T h erefore, t h e sweep is triggered only by
t he h ig h er-frequency com p
onents of t he trigger signal . T h is
F ig
.
2-6 . Fr eq uen cy ra nge of eac h CO UPL I NG switc h p ositio n .
O p erati ng I n structions-Type
71350
position is particularly
useful for p r oviding stable tr iggering
if t he trigger sig n al contai n s
line-frequency com p onents .
Also, t h e AC LF REJ position
provides t he best alternate-
mode vertical dis p lays at fast swee p
rates w h en comparing
two or more unrelate d signals (wit h
dual-trace vertical or
slaved triggeri ng o p eratio nfor dual-vertical
unit o p eratio n ) .
AC HF REJ . T h e AC HF REJ position passes
all low-
frequency sig n als between a b out 30 h ertz
and 50
k ilo
h ertz .
DC is re j ected and signals outside t he a b ove range
are atten-
uated . Wh en triggeri n g f r om complex wavefo r
ms, t h is posi-
tion is useful fo r providing stable display of
t he low-
frequency compo n e n ts .
DC . DC
CO UPL
I N
G can be used to provide stable trig-
gering with low-frequency signals
w
h
ich would be atten-
uated in t he
ot
h
er modes, or wit hlow-repetition rate sig-
n als . It
can also be use d to trigge r t he sweep w hen t h e
trigger sig
n al reaches α DC level selected by t he setting of
t h e LEVEL
/S L O
PE
cont r ol . Wh en using internal trigge r ing,
t
he setting
of t he ve r tical unit position co n trols affects t h e
DC
triggering
point .
Trigger Source
T h e pus hbutton s locate d below t he SO UR CE title (see
F
ig . 2-4) select the source of t h e trigger signal w h ic h is
co nnecte d to t h e trigger circuits . T he selected source
is indi-
cated by α
lig h ted
pus
h
button
.
100 Hz

10 Ι ( Η 7 100 )(H z 10 MHz

100 M H 7
2-9

O pe r ating Instr u ctions-Ty p e 71350
INT .
In
t he ΙΝΤ
p ositio n of the SOUR C E switc h , t h e
trigger sig n al is derive d f r om t he
associated vertical un it .
F urt h er selectio n of t he inter n al t r igger
signal may b e pro-
vided b y t he associate d vertical un it
or in d icato r oscillo-
scope ; see t he i n st r uction
ma
n
uals for t h ese instruments for
informatio n . F or most app licatio n s,
t he ΙΝΤ -SO UR C E posi-
tio n can be used . H owever, some
a pp lications re q uire
special triggering w h ic h cannot be ob tai n
ed in t he ΙΝΤ -
SO UR CE p ositio n .
In such cases L I NE- or ΕΧΤ -SO UR C E
must be used .
L I NE . T h e L I NE p ositio n of t he
SO
UR C E switc h
con-
nects α sample of t h e power-line voltage, to w h ic h t he i nd i-
cato r oscillosco pe is connecte d , to t he t r igger circuit
. L
ine
triggering is useful w h en t he in p ut signal is time-relate d
(multi p le or su b -multiple) to t he line fre q uency . It is also
useful for p rovi d ing α stable d isplay of α line-fre quen cy
component i n α complex waveform .
EXT . An exter n al sig n al con n ecte
d to t
he
ΕΧΤ T R IG
IN
connector can be
use
d to trigge r t he sweep
in the ΕΧΤ -
SO UR C E p osition . T h e exter n
al
sig n
al must b e time-relate d
to t he d is p laye d waveform
fo
r
α stable d is p lay . An exter n al
trigger sig n al
can be used to p rovi deα triggered dis p lay
w hen t he internal signal is too low in amplitude for correct
triggeri ng or con tains signal com pone n ts on w h ic h it is not
desire
d to
trigger
. It is also useful w hen signal tracing i n
am p lifiers,
ph ase-s h ift n etwork s, wave-s ha p ing circuits, etc .
T
he sig n
al from α single point in t h e circuit un d er test can
be
connecte d
to
t he
ΕΧΤ T R IG IN connector t h roug h α
p r
obe or ca b le . T h e sweep is t hen triggered by the same
sig n al at
all times an d allows amplitu d e, time relations h ip or
waves hape ch anges
of
signals
at various points in t he circuit
to be examined wit h
out resetting t h e T R IGG ER I NG
cont r ols .
ΕΧΤ
-
10 . O p eratio n i n t h e ΕΧΤ
-
10 positio n is t he
same as d escri bed for ΕΧΤ
exce p t t h at t he external signal is
attenuate d 10 times . Attenuation of h ig h
-am p litu d e exter-
nal trigger sig n als is d esirable to broa d en t he ra n ge of
t
he
LEVEL /S L O PE con t r ol .
Trigger Slo pe
T he LEVEL /S L O PE control determines w h et h er
t
he
trigger circuit respo n ds on t he p ositive-going or negative-
going p ortio n of t h e trigger sig n al . Wh en t he indicator line
on
t he
outer ring of t he LEVEL /S L O PE con trol is to t he
left
of center, t he d is p lay starts on t he p ositive-going p ortio n of
t he waveform
( n
otice p ositive-goi ng waveform
to
left of
control . To t h e rig h t of ce n ter, t he d isplay starts
on t
he
negative-going po r tion of t h e waveform ( n otice
negative-
going waveform) . T h e effect of t h e LEVEL
/S L O
PE
control
on t h e d is p laye d
waveform is s h ow
n
in F ig
.
2-7
.
Wh en
several cycles of α signal
a p pear in t he d is p lay, t h e selectio n
of t he trigger slope is often
unim po r ta n t . H owever, if only α
certain p ortio n of α
cycle is to b e dis p laye d , correct setti ng
2-10
of t h e LEVEL /S L O PE control is important to p
rovi de α
d isplay w h ic h starts on t he d esi r e d slo p e of t he
input signal .
T he LEVEL /S L O PE control
dete r min es the voltage level
on t he trigge r signal at w h
ic
h t h
e dis p lay is triggere d , as well
as selecting the trigger slo p e . T h e
ce n ter k no b of t he
LEVEL /S L O PE con trol p rovi d es abo u t
α3
:1
r ed uction i n
relatio n to t he oute r in d icator ri n g, to allow
precise level
selectio n . T h is cont r ol can also be tur ne d t h
ro ughout the
com p lete 360 ° rotation to allow con ti nuous trigge ri n g
ove
r
t he selecte d slo p e . T h is is p articula r ly u seful in
t
he Ρ - Ρ
A U TO M OD E . Wh en t h e LEVEL /SL O PE
control is set to
t he "0" oon eit h er t he positive-goi ng or n egative-going wave-
form, t h e swee p is t r iggere d n ear t he ze r o-volt level
of
t h e
trigger sig n al . As t he LEVEL /S L O PE
con
tr
ol is rotate d
away from t h e "0", t h e dis p laye d
waveform sta r ts at α
point correspo nd ing to t he p osition of
t
he
i nd icator line on
t he associated slope waveform (wit h in
amplitu d e range of
tr igger signal exce p t in Ρ - Ρ AU TO M OD E w h
ic
h p
rovi d es
triggere d dis p lay throughout entire slope) . F o r exam p le, if
t
he
LEVEL /S L O PE con tr ol is t ur ned cloc k wise
from
t
he
"0"
on
t he
p ositive-going slo p e, t h e d is p layed wavefo r m
starts at α more p
ositive level . F ig . 2-7 illustrates t he op era-
tion of t he LEVEL /S L
O
PE
co n t r ol at d iffe r e n t levels an d
slo p es of α d isplaye d waveform .
B efore
setting t h e triggering level, select the T R
IG-
G ER I NG SL
O
PE, M
OD
E ,
CO UPL I N G and SO UR C E . T h en
ad j ust t he LEVEL /S L
O
PE
control so the d isplaye d wave-
form starts at t h e d esire d point . T he trigge r i ng
slope can b e
ch anged at any time by rotating t he LEVEL
/S L
O PE
con-
trol
to
t he correspo nd ing p oint on t he ot h er slo p e
waveform .
H orizontal Swee p R ate
T he ΤΙΜΕ /DI V switc h p rovi d es
25 calibrated sweep
rates r a n gi ng from 0 .05 mic r osecond / d ivision
to five
secon d s/ d ivisio n . T he V A R IA BLE ΤΙΜΕ /DI V
con trol must
be in t he cali b rated p osition and t h e M AG N I F I
ER at Χ 1
fo r t h e in d icated swee p rate . T he V A R IA BLE
ΤΙΜΕ /DI V
co n trol i n cor p orates α
two-position switc h to d etermine if
t he sweep r ate is
calib
r
ate d or uncalibrate d . Wh en t he
V A R IA BLE knob is in
t h e inward p osition, t h e V A R I-
A BLE ΤΙΜΕ /DI V
control is inope r ative and t he sweep r ate
is cali b rated
.
Wh en p
resse d an d release d , the V A R IA BLE
kn ob moves o utward
to activate t h e V A R IA BLE TIME/
DI V
control fo r uncalibrate d sweep rates . Α cali b rate d
sweep
rate can be obtaine d at any position of t h e V A R I-
A BLE
ΤΙΜΕ /DI V control b y p ressing in t he V A R IA BLE
kn
ob . T
h
is feature is useful w hen α s p ecific uncali b rate d
sweep r
ate h as been obtaine d and it is d esi r ed to switc h
between
t
h is
un cali b rate d sweep rate a n d α calibrate d sweep
rate . Switch i
ng
from uncali b rate d to cali b rate d o p eration or
vice
versa does n ot affect the setting of t he V A R IA BLE
ΤΙΜΕ /DI
V control . T he V A R IA BLE ΤΙΜΕ /DI V cont r ol

C
R T
d is p lays
ob tai n e d wit h
LEVEL
/S LO
PE
co
n
t
r
ol
i
n
p ositive-slo pe
regio n
C RT d is p lays
ob tai
n
ed
wit h
LEVEL /S L O
PE
co n t r ol i n
n egative-slo
pe
r
egio
n
m e - 0
LEVEL/SLOPE
F
ig .
2-7 . E ffect of LEVEL /S L O P E control
on
C RT d is p lay (A U TO Ρ - Ρ M OD E ) .
Operating Instr u ctions-Type 71350
HEMEMNEWEN
m
u 'mm m u
m m
mo
mm ιιι r ι r m ιυιι rm ιιιισ
ιιιιτιι " m Ε m υιιται
ιιιι mm ιιιι
ιιιιιι m ιιαι
. .
OMEN
Emmom
r ιηιΕ f r ιι r ιι ι
ιι
r ιιιιιιιιιιιιιι u m mu ιιιιΙιιι
Ο f ιιιι
mm ιιιι r
ιιιιιι
ιιτιι
mm
αιτιι
"m
ιΝι W ΕΕΝι r
ι
ιιιιΕΜιιιι
N egative
(-) slo pe
EMONNE
0 ιιιι 0 r ιι
W . υ1 ιιιιισ
N,
ME MEMO
No ι ,

Μ // /Μ
"N"1"1
mu 'm ι 1o lf amm m
mm r ιιιιιι " ι r ιιιιιιιιιι
ιτιιτι
< m
οιιτιοιι
ιιιΝιΕΕιΝιιι
ιιιιιιΕΕιι ιιι
2-11

Ope r ating
Instructions-Ty
pe
71350
allows t h e sweep r ate i n eac h ΤΙΜΕ /DI V switc h
position to
be re d uce d to at least t he swee p rate of t he n ext
ad j acent
switc h p
osition . T h is provi d es an overall u ncalibrate d vari-
a b le sweep r ate range from
50 nan osecon d s/division (f r om
5 nanosecon d s/ d ivisio n wit
h M AG N I F I ER at Χ 10) to about
12
.5 sec on ds/ d ivisio
n .
Wh en
ma
k ing time measureme n ts from t he gratic u le, the
area
between t he secon d - d ivisio nan d te n t h - d ivisio n ve r tical
li
n es of the graticule p r ovi d es the most linear time measure-
ment (see
F
ig . 2-8) . T h
erefore, t he fi r st
an d last d
ivisio n
of
the d isplay
area s ho
u ld
n
ot be used w hen ma k ing accurate
time measurements . P ositio n t h e sta r t
of t
he
timing area to
t h e second-divisio n ve r tical li ne (seco nd line fr om t he left)
a nd a d ju st the ΤΙΜΕ /DI V switc h so t he end of the timi ng
area falls between t h e secon d - d ivision a n d tent h - d ivisio n
vertical lines .
Swee p M agnifier
T h e sweep mag n ifier expand s t h e sweep
te
n
times . T he
ce n ter d ivision of t h eu
nmag
n ified
d is p lay is the po
r
tion
visible on t h e screen in magnified
form (see
F
ig . 2-9) .
Eq uivalent le n gt h of t he magnifie d
swee p is more than 100
divisio n s ; any 10- d ivisio n p ortion
can b e viewe d by
a d j usti n g t he h orizontal P OSITIO N cont r ol
to bring the
d esi r e d p ortio n on to the viewi ng area . T he
dual-range
feature of t he h orizontal P OSITIO N control
is p articularly
u sef u l w h en t he M AG N I F I ER issetto Χ 10
(see
H
orizo n tal
P
ositio n Control d iscussion w h ic h follows) .
To use swee p mag n ificatio n , first
move t he portio n of
t he d is p lay w h ic h is to
be expan d ed to t h e ce n te r of t he
graticule . T hen press t h e
X10-MAGNIFIER p us hb utto n ;
t h e X10 b utto n lig h ts to
in d icate th at t he h orizo n tal swee p
rate is magnifie d . Wh en ever
t h e X10-MAGNIFIER push -
button is lig h te d , t he e q uivalent
mag n ified swee p rate can
be d etermine d b y d ivi d ing t h e ΤΙΜΕ /DI
V switc h setting by
10 . F or example, if t he ΤΙΜΕ /DI V
switc h is set to .05 μ s,
t he e q uivalent mag n ifie d swee p
rate is 5 nanoseco n ds/
d ivision . T he eq uivalent magnified
swee p rate must b e use d
for all time measureme n ts w h en t h e
X10-MAGNIFIER
b utton is lig h te d . T he eq uivale n t magnifie d swee p
rate is
calibrate d w hen t he VA R IA BLE ΤΙΜΕ /DI V control is i n
t he calibrate d position .
H orizontal Position Co n trol
T he Ty p e 71350 provides both fine and
coa
r
se ad j ust-
ment of p ositioning . T he coarse a dj ustment
p rovi d es rapid
h orizo n tal positio n ing of t h e trace . F i n e p ositioni ng is p
ro-
vi d ed for more p recise cont r ol of trace p osition .
Dis p lay M o
de
Time-Base . W it h t he DIS PL AY M OD E switc h in t he
TIME B AS Ep osition t h e Ty p e 71350 functio n s as αnormal
time-base wit h t he sweep rate set b y t h e ΤΙΜΕ
/DI V switc h .
Η ++ Η - F Η
ξ
ε +++
τ
Seco nd -ve r tical Ten t h -ve r tical
li n e
F ig . 2-9 . O p eratio n of swee p magnifier
.
li n e
Ti m e M eas ur
eme n t -
a r ea
F ig . 2-8 . Area of gratic u le u se d for acc u rate ti m e meas ur eme n
ts .
INNER
Unmagnified waveform
r1l
..
ONEENIENE
wbooffiffiffiffiffil
.
me
OEM
;
1!! 0,01r-E m
MENEEMONg
%
It
NEENEEMENE 1
MENEEMENER,
VENOM
P .
ME
~ M"' .'W fflmmm
ONE
NOOMEMENE
Magnified ' wavelform
MENEM