Tektronix 7B71 User manual

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SE CTIO
N
1
SECTION 2
P age
S PECIF ICATIO N S
Introduction
1-1
E lectrical C h aracteristics 1-1
Swee pR ate 1-1
Swee p Acc u racy 1-1
Swee p L engt h 1-1
Swee pH ol d -Off Time 1-1
V ariable - Time Delay 1-1
Delay Time Accuracy 1-1
M ulti p lier Incremental L inearity 1-1
J itter 1-1
Differential Ti m e M easure m ent Accuracy 1-2
Trigger Sensitivity 1-2
Internal Trigger J itter 1-2
External T rigger In p ut 1-2
L evel R ange 1-2
Ρ - Ρ Auto Sensitivity 1-2
E
nviron m e n tal C h aracteristics
Altitude 1-2
Ph ysical C h aracteristics
F inis h
1-2
Dime n sions 1-2
W eig h t 1-2
O P ERATI N G I N STR U CTIO N S
General 2-1
Installation
2-1
F ront P
anel
Controls
2-1
Test Setu p C h art
2-4
General O p erating Infor m ation
2-4
Swee p Calibration C h ec k 2-4
Si m plified O p erating Instructions 2-6
Normal Swee p 2-6
M agnifie d Swee p 2-6
Delaye d Swee p 2-6
P us h button Switc h L ogic 2-6
Triggere d L ig h t 2-7
Trigger M o d e 2-7
Trigger Cou p ling 2-9
Trigger Source 2-10
Trigger Slo p e 2-10
Trigger L evel 2-10
H ori z ontal Swee p R ate 2-12
Swee p M agnifier 2-12
H ori z ontal P osition Control 2-13

Page
SECTION 2 OPERATING INSTRUCTIONS (cont)
Applications
2-13
General
2-13
Measurement Techniques
2-13
Time Duration Measurements
2-14
Determining Frequency
2-15
Risetime Measurements
2-15
Delay Sweep Time Measurements
2-16
Delayed Sweep Magnification
2-17
Displaying Complex Signals Using Delayed Sweep
2-18
Pulse Jitter Measurements
2-18
SECTION 3CIRCUIT'
DESCRIPTION
Introduction
3-1
Block Diagram Description
3-1
Detailed Circuit Description
3-1
Trigger Input
3-1
Input Source 3-1
Trigger Amplifier
3-2
General
3-2
External Input
Amplifier 3-2
Input Stage
3-2
Peak Detector
3-3
Slope Comparator
3-3
Output Stage
3-4
Trigger
Generator 3-4
Trigger Pulse Generator 3-4
Sweep
Gate Stage 3-4
Triggered
Hold-Off Stage 3-4
Bright Line Auto 3-5
Time-Base Generator 3-5
General 3-5
Normal Trigger Mode Operation 3-5
Single Sweep Operation 3-8
Alternate Operation 3-8
Delayed Sweep Operation 3-8
Delay Pickoff 3-9
Horizontal Preamp 3-9
Readout Block 3-9
SECTION 4 MAINTENANCE
Preventive Maintenance
4-1
General
4-1
Cleaning
4-1
Visual Inspection 4-1
Transistor and Integrated Circuit Checks
4-1
Recalibration
4-1

CHANGE
INFORMATION
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 .
SECTION 4 MAINTENANCE (cont) Page
Troubleshooting
4-2
Troubleshooting Aids
4-2
Troubleshooting
Equipment 4-2
Troubleshooting Techniques 4-2
Corrective Maintenance 4-6
General 4-6
Obtaining Replacement Parts 4-6
Soldering Techniques
4-7
Component
Replacement 4-7
Instrument
Repackaging 4-10
SECTION 5 PERFORMANCE
CHECK/CALIBRATION
Introduction
5-1
Test Equipment Required 5-1
Short-Form Procedure and Index
5-2
Performance Check/Calibration Procedure
5-4
General
5-4
Preliminary Control Settings 5-5
Check/Adjust Steps (refer to Short-Form Procedure 5-6
for index to steps)
SECTION 6 ELECTRICAL PARTS LIST
Abbreviations and Symbols
Parts Ordering Information
Index of Electrical
Parts
List
SECTION 7
DIAGRAMS AND MECHANICAL PARTS ILLUSTRATIONS
Diagrams
Mechanical Parts Illustrations
SECTION 8 MECHANICAL
PARTS LIST
Mechanical Parts List
Information
Index of Mechanical
Parts Illustrations
Mechanical Parts List
Accessories

7 Β 71
F ig . 1-1 . 7Β 71 Delaying Time Base .

In tro d uction
VA R IA BLE R ange
( u ncali b
rate
d )
5 s/ d iv to 0 .1
s /div an d 0 .2
μ s /d iv
to 0 .02
μ s /d iv
50 ms/ d iv to
0 .5 μ s/ d iv
Over any 2 div
i n terval wit h in
center 8 d iv
Ch ange information, if any, affecting t h is section will be found at t h e rear of t h e man u al .
T he 71371 Time Base U nit is d
esigne d specifically for use
with Te k tronix 7700-Series
Oscillosco p es . H owever, it is
com p ati b le wit h all 7000-Series Oscillosco p
es . T he 71371
p rovi d es cali b rate d swee p s from 5 seco
n d s/ d ivision to 0 .02
microseco n ds/ d ivision (2
nanosecon d s/ d ivision with Χ 10
M AG N I F
I ER ) . Sweep r ates may b e varie d continuously
( u ncali b rated) between calibrate d steps . Swee p triggeri ng is
to 200 mega h ert z or ve r tical a m p lifier b an dwid th, w h ic h -
ever
is less
.
T h e d elaying sweep feature of the 71371, in
delaye
d swee p operation, gives co n tin u ous sweep d elay
from 0 to 10 times the setting of the ΤΙΜΕ /DI V O R D L
Y
5 secon d s/ d ivision to 0 .02 micro-
seco n d s/ d ivisio n in α 1-2-5 se-
qu ence . Χ 10 mag n ifier exten d s
swee p r ate to 2 n an oseco nd s/
d ivision .
Continuously varia b le betwee n cali-
br ate
d sweep
rates
.
Extend s uncali-
b rate d sweep
rate to at least 12 .5
seco nd s/ d ivision .
M easure d in 7700 series mainframe
+15 0 C to +35 ° C

0 0 C to +50 ° C
U η m αg Κ I _-_
Μ α
9
_ Γ ._
U nmag T M
ag
_ ._ .
3% ο
TA BLE 1-1
Electrical C ha r acteristics
TIME selector . T h e sweep free-runs provi d ing αb rig h t b ase-
line in t h e a b se n ce of ade qu ate triggeri ng signal i nΡ - Ρ
A U TO a nd AUTO t r iggering mo d es .
T h e P erformance C h ec k proce du re
given in Section 5 of
t h is man u al p rovi d es α convenient met h
od of ch ec k ing p er-
formance of t h is instrument .
T h
e
followi ng elect r ical
ch aracteristics apply at
an ambient tem p erature of 0 0 C to
+50 0 C, unless ot h erwise
noted . W armu p time for given
accuracy is 20 m inutes .
Exclude Following
P ortions of
Sweep H ol d-Of f Ti m e
5 s/ d iv to
5 μ s/ d iv
2 μ s / d iv to
0 .02 μ s/ d iv
Varia b le Time
Delay
Delay
Time
Accuracy
5 s/ d iv to
1
s/div

W ithin 2% ο
Multi p lier
Incremental
L inearity

W it h in 0 .2%
10 d ivisions to 13
divisions . s .
713711
En d of Swee p ; b eyon d 100 divisions
J itter

1
1 part o r less in 50,000 of 10 ti m es
t he ΤΙΜΕ /DI V setting

Sp ecification
--7 Β 71
Trigger Sensitivity
T
ABLE 1-1 (cont)
-------------
Perfor m ance Characteristic
Differential Time
Measurement
Accuracy
Delay Time
1 μ sto0 .5s
1 sto5s
ουριιη g
AC
AC LF REJ Z
AC HF REJ
DC
Single Sweep
Internal Trigger Jitter
W ithin 1°/ ο and 2 minor divisions
W ithin 2°/ ο and 2 minor divisions
Triggering
Fre q uency
sweep only .
Minimum Trig-
gering Signal
R equire d
__
I
_
NT_
.___
ΓΕΧΤ
___
7575 mV
375 mV
75 mV
375 mV
75 mV
75 mV
375 mV
Triggering re quirements same as
nor m al swee p . When triggere d ,
swee p generator p rod uces one
1 n anosecond or less at 150 mega-
hertz .
TABLE 1-1 (cont)
_ ._ . . :
Characteristic

Performance
Input
R and C
L evel R ange
(Excluding
Ρ - Ρ AU TO)
ΕΧΤ
ΕΧΤ = 10
Ρ - Ρ AUTO op eration
Sensitivity
L ow Freq
uency
R es p onse
Characteristic
Altitude
1 megohm
within 2%, 20 picofarads
within
2 p icofara d s .
At
least +1 .5 volts to --1 .5 volts .
At
least +15 volts to --15 volts .
0 .5 div
Internal, 125 millivolts
E xternal
200 Hz to 20 MHz . U pp er
frequency
an d am p litude limits
same
as NOR M AL Trigger
Sensi-
tivity .
M ust Trigger on50
h ertz, 2 division
signal .
TABLE 1-2
E nvironmental Characteristics
This instrument will meet the electrical characteristics given
in Table 1-1 over the following environmental limits .
E xternal Trigger Input
M aximu
m
I nput 500 volts (DC + P eak AC) . 500
Voltage volts (P- Ρ AC) at 1 kilohertz or less .
TABLE 1-3
Physical Characteristics
1
On Internal
Triggering
Only ; t he specifie du pp er -3 dB frequency
Finish Front panel is anodize d aluminum
.
of the V ertical System replaces upper limit fre
q uencies in t he
above
table
when the number in the table is
greater than the -3dB Dimensions
Fits single plug-in com partment of
frequency of the Vertical System .
7000-series
oscilloscope
.
2 W ill not trigger on sine waves of 3 divisions or less internal or 1 .5
volts external below 120 Hz .
W eight A p
proximately 2 .88 poun d s .

General
Installation
General
C hange information, if any, affecting this section will be found at the rear of the manual .
The 71371 d elaying sweep p lug-in unit op erates with α
Tek tronix 7000-series in d icator oscillosco p e and α 7A-series
vertical plug-in un it to form α complete oscillosco pe
system . To use t he 71371 effectively, its o p eratio nand
capabilities sh oul d be kn own . 'T h is section d escribes t he
ope r ation of t he front- p anel controls, gives first-time and
general o p erati n g information and lists some basic a pp lica-
tions for th is i n strument .
The 71371 is desig ned to op erate in t he h orizontal p lug-in
com p artments of Tektronix 7000-series oscilloscopes . The
71371 can also b e installe d in α vertical p lug-in com p artment
to p rovi d e αsweep t h at ru n s vertically on t he CRT . How-
ever,
w hen
use
d in
t
h is
ma nn er, t h ere is no retrace blan k ing
or i n ter n al
triggering
p rovision
an
d
t
he
unit may not meet
t he s p ecifications given in Section 1 .
The instructions in
this manual are writte n for use of t he 71371 in α h orizontal
p lug-i n com p artment of t h e oscillosco p e .
Wh en t he 71371 is u se dwith an oscillosco pe w h ic h h as
two h
orizo n tal p lug-i n com p artments, install t h is unit i n t h e
Α (DE L AYI N
G TIME BASE) compartment . Then, if a
d elaye d -swee
p
unit is installe d in t he Β (rig h t) compart-
me n t, d elayed-swee p o p eration is available . 'T he 71371 will
operate p ro p erly in t he Β com partment for
all
h
orizo n tal
mo d es of operation excep t d elayi ng swee p .
To
install the 71371 into
α p lug-in co m partment, push it
in u
n
til it fits firmly i
n to
t he indicator p lug-in com p art-
ment . To remove, pull t he release latc h (see Fig . 2-1) to
dise n gage t
he
unit
from
t
he
i n d icator and pull it out of t he
p lug-in compartment . Even t h oug h t h e h orizontal gai n of
t he in d icator oscillosco p e is sta nd ar d ize d to min imi ze
a d j ustme n t w h en i n serting p lug-in units, t he sweep calib r a-
tion of t he 71371 sh oul dbe c h ec k ed w hen it is inserte d into
t h e in d icator to verify measureme n t accuracy . The pro-
ce d ure for check ing the unit is given und er Swee p Cali b ra-
tion C h eck in t h is section .
FRONT-PANEL CONTROLS
All
controls requi r e d for t he o pe r ation of the
71371
are
locate d
on
t he front p anel of
t
he u n it (see Fig . 2-2) . To
Α
F ig . 2-1 . Locatio n of release
latc h .
ma ke full use of t he ca p abilities of t h is i n stru m e n t, t he
o pe r ator s h oul d be familiar wit h t he fu n ctio n an d use of
each of t h ese con trols . Α b r ief descri p tion of t h e fro n t-
p anel con trols an d con n ector is give n h ere . More d etailed
informatio n
is given under Ge n eral O p erating Information .
Triggering Controls
713711
LEVEL IS L O PE

Selects t he amplitu de p oi n t a nd
slope of trigge r signal on w h ic h t he
sweep is triggere d . Wh en t he in d ica
tor line on t he outer ring is to t he
left
of center, t he sweep is triggere d
on t he positive-going slo pe of t he
trigger signal, as s h own by t he
p ositive-going waveform . To t he
rig ht of center, t he swee p is trig-
gere d on t he negative-goi ng slo pe of
t he trigger signal as s h own b y t he
n egative-going waveform .
ΤR IG'D

L ig h t in d icates t h at t he sweep is
triggere d and will produce α display
with co r rect setting of t he POSI
TION con trol and t he controls on
t he associated ve r tical unit an d i nd i-
cator oscillosco p e .

Ope r ati ng Instructions-713711
TR IGG ER I NG
TR IG'D "

MODE

CO UPL I NG
LEVEL /S L OPE
Ρ - Ρ
AUTO AC
ι r ιτ
ιη ~ ; ιπι ., , CA L
IN
Ι , ΧΙΜΕ
/DI
V O R D L Y TIME
εΙ

ms
'5 .2 7_ ~lj
2
T RIGG
ER
CO N T RO LS
S WEEP
CO N T
RO LS
T RIGG ER
CO N T RO L
M OD E
2-2
Se r ies
of push-button switc h
es to
select t he trigge r m ode .
Selecte d
mo d e is i nd icated by
lig h te d
b
utto n .
Ρ - Ρ AU TO :
Swee p automatically
t r igge r ed
at p oint selecte d b y t he
LEVEL/SLOPE
control w hen
the tr igge r signal re p etitio n r
ate
is
a b ove a b out 200 h e r tz a nd
wit
h
i n t he freq uency ra n ge
Fig .
2-2 .
Fr o n t- P an el co n trols and
co nn ectors .
selecte d by t h e CO UPL I NG
switc
h . T r igge r ed sweep can b e
o b tai ned
t hroug h out t he r an ge
of t h e LEVEL /S L O PE control .
Wh en t h e t r igge r r ep etition r ate
is b
elow t he lowe r freq u e ncy
li m it
(o
r
above upp e r limit fo r
AC HF
REJ) o r w hen t he tr igger
sig n
al is i nade q uate, the swee p
f r
ee r uns at the swee p r ate
selecte d b y t he ΤΙΜΕ /DI V
switc h to pr oduce α r efere nce
tr ace .

A U TO : Swee p i n
itiate d by t h e
app lied trigge r
signal at p oi n t
selecte d b y t h e
LEVEL /S L O PE
co n trol w h e n t h e
trigger sig n al
re p
etitio n rate is
above abo u t 30
h
ertz a n d wit h in t h
e fre q u ency
range selecte d
by t h e CO U -
PL I
N
G switc h . Triggere d sweep
can be obtai ned only ove r t
he
am p
lit ud e range of t he app
lie d
trigger signal . Wh en the LEVEL
/
SL O PE co n trol is
outsi de the
am p lit ude r an ge,
t
he
t r igge r
re p etition rate is b
elow t he
lower fre q uency limit
(or above
up p er limit for
ACHF REJ) or
t he t r igger sig n al is
inade q uate,
t he swee p free r uns
at t he sweep
r ate selecte d by t he
ΤΙΜΕ /DI V
switc h to p ro duce
α refere n ce
trace .
NORM : Swee p i n
itiate dby t he
a pp lie d trigger signal
at any
p oint selecte dby t he
LEVEL /
S L O PE control over t h e
fre-
q uency
r an ge selecte db y t
he
CO UPL I NG
switc h . Trigge r ed
swee pcan b e
obtaine d only over
t he am p litu d e
range of t he
a pp lied trigger signal .
Wh en t h e
LEVEL /S L O PE
con trol is out-
si d e t he am p litu d
e range, t h e
trigger re p etition rate
is outsi d e
the fr e q uency range
selected b y
the CO UPL I N G switc h
or the
t r igger signal is ina de q
uate, t h ere
is no trace .
SI NG LE S WP : Swee p i n itiate d by
t he a pp lie d trigger signal at any
p oi nt selecte dby t he LEVEL /
SL O
PE
control over the fre-
q uency range selecte d by t he
CO UPL I NG switc h . Triggere d
swee pcan be o b taine donly over
t he am p litu d e range
of a p p
lie d
trigger signal . After t h e first
sweep is d is p laye d , furt h er
swee p s cannot bep r ese n te du n til
the RESE T- RE ADY p us h -
b utton is presse d . Wh en t he
LEVEL
/S
L O PE
control is out-
si d e t he am p litu d e ra n ge,
t
he
trigger r ep etition rate is outsi de
t he fr equency range selecte d by
t he CO UPL I NG switc h , the trig-
ger sig n al is ina d eq
uate or
w
h en
t he RE SET"-RE ADY
lig
h
t is
off,
t h ere
is no t r ace
.
CO UPL I N G
SOUR C E
Op e r ating Instructions---71371
RE
S
E
T-
R EADY : P
us
h
-butto
n
to
reset t h e Swee p Ge n erator for
th e next sweep in t h e single-
swee p mo d e . T h e RESET-
READYbutto
n remains lig h
te
d
to
i n
dicate t
h
at t
h eu n
it is
r
eady
to b e triggere d . Afte r t h e unit is
triggere d an d α sweep is com-
p leted, t he RESET-READY lig h t
goes out until t he button is
p resse d agai n .
Series of p us h -button
switc h es to
select t he trigger cou p ling . Selected
coup li ng is in d icate d b y lig h te d
b utto n .
AC : R e j
ects DC an d attenuates AC
sig
n
als below a b out 30 h ertz .
Acce p ts sig n als between 30 h ertz
and 200 mega h ertz .
AC

LF

REJ : R e j ects

DC

an d
attenuates signals below ab o u t
30 k ilo h ertz . Acce p ts sig n
als
b etween 30 k ilo he r tz
an d 200
mega h ertz .
AC HF R EJ : Acce p ts signals
be-
tween about 30 h ertz an d
50
k ilo h ert z . R ejects DC
an d atte n -
uates sig
n als outsi d e t h is fre-
q ue n cy
range .
DC : Accepts all trigger signals from
DC to 200 mega h ertz .
Series of push -button switc h es to
select t he trigger source . Selecte d
so urce is in d icate d b y lig h te d
button .
ΙΝΤ : Trigger signal obtained inter-
nally
from α vertical unit .
L I N E : Trigger signal obtai ned
internally from α sam p le of t h e
line voltage a pp lie d to t h is
instrument .
ΕΧΤ : Trigge r sig n al obtaine d from
an external signal app lie d to t h e
ΕΧΤ TRIG IN con n ector .
ΕΧΤ -~ 10 : Trigger signal obtai ned
from an exter n al signal a pp lied
to t he ΕΧΤ TRIG IN connector
as in t he ΕΧΤ p osition . In t h is
2- 3

O pe r ati ng I n structions--71371
ΕΧΤ TRIG
IN
Swee p Co n trols
P OSITIO N Controls h orizo n tal p
osition of
d isplay .
FINE
ΤΙΜΕ /DI VO R
DL
Y
TIME
VAR IA BLE
M AG N I F I ER
2- 4
p ositio n t he
exter n al signal is
atte nu ate d10 times
befo
r
e it is
a pp lie d to t h e t r igger circuit
.
In p ut con nector for external trigger
signal .
Pr ovi d es more p recise
co n trol of
h orizontal p ositions .
Selects the basic sweep rate
of t
he
out p u t sawtoot h
a nd selects basic
d elay ti m e (to be
multi p lie d b y t he
D EL AY
TIME MUL T dial setting) .
T he V
A R IA BLE control must be in
calibrate d positio n and M AG N I-
F I E D
switc h set to Χ 1 for in d icate d
swee p rate .
Two-position switc h actuate d by
t he VA RIA BLE kn ob to select cali-
brate d or un calib r ate d swee p r ates .
At t
he
in p osition, t he V A R IA BLE
control is
ino p erative and t he swee p
rate is
calibrate d . Wh en
p resse
d an d
release d , t h e kn ob moves
out to
activate t h e VA R IA BLE control for
uncalib r ated swee p rates . The
swee p rate in each ΤΙΜΕ /DI V
switc h p osition ca n be re d uce d to
at least t h e sweep rate of the next
a d j acent position, to p r ovi de
con-
tinuously variable sweep rates fro m
2 nanoseco nd s/ d ivision
(X10-
MAGNIFIER on) to about 12 .5
secon d s/division, with M AG N I-
F I ER at Χ 1 .
P ush -button switc h es to select
t
h
e
h orizo n tal mag n ification .
T h e
Selecte d magnification is in
d icate d
by α lig h te d button
.
Χ 1 : M
agnifie d swee p at t he b asic
sweep
rate
i
n d icate dby TIME/
DI V
switc h .
Χ 10 : M ag n ifie d swee p
at α swee p
rate 10 ti
m es
faster
t han t he
b asic swee p r
ate in d icate dby t he
ΤΙΜΕ /DI V switc h .
T
h e p
ortio n
of the normal sweep with in t he
ce n ter d ivisio n of t he graticule is
t he
p
ortio n sh own in magnifie d
form .
S WP
CA L Screw d river

ad j ust m ent to set
amplitu de
of t he outp ut sawtooth .
Delay Controls
Β D EL AY M OD E
Series of p u sh -button
switc h es to
( Α ΙΝΤΕΝ

select t he d
elay logic to t he com
D UR I NG Β )

p anion delaye
d -swee p unit ( Β ) .
Selecte d d elay
mo de is in d icate d by
α lig h te d b utton
.
General
Swee p Calibration C h ec k
INDEPENDENT
: T he 71371
and
t he
com p an ion d elaye d -swee
p
unit ( Β ) o p erate i nde
p end ently
as normal time-base
units .
Β STA R TS A F TER D EL AY : T he
com pan ion d elayed-swee p unit
( Β ) p ro d uces αsweep immediate-
ly following t he d elay time
selecte d by t he ΤΙΜΕ /DI VO R
D L Y TIME switc h an d t he
D EL AY TIME MUL T d ial .
Β TRIGG ER A BLE
A
FT
ER
D EL AY : T he com p
anion d elaye d -
sweep unit ( Β )
pro d u ces αsweep
after t he
first trigger p ulse is
receive d followi ng t he d elay
time selected b y t he ΤΙΜΕ /DI V
O
R
D L
Y
TIME switc han d t h e
DELAY TIME MUL T DIA L .
D EL AY TIME MUL T

P
rovides varia b le

delay fo r t he
delay p ulse to t he com p anion
d elaye d -swee p u n it ( Β ) from 0 to
10
times t h e basic delay time selec-
te d b y
t h e ΤΙΜΕ /DI V O R D EL AY
TIME switc h .
'TEST S E TU P C H A RT
F ig . 2-3 s h ows t he front panel
of t h e 71371 . T h is ch art
ca n be re pr od uced and use d
as α test-setu p recor d for
sp
ecial measureme n ts, app licatio n s
or proce d ures, or it may
be use d as α trai n ing ai d for
familia r ization with t h is
instr u ment .
G
E
NER A L OPERATING INF
O RM ATION
W he n ever t h e 71371 is
inserted into α p lug-in com p art-
m ent oth er t h a n t he one
in w h ic h it was calibrated, t he
sweep calib r ation s h
ould b e ch ec ke d and r ead j uste
d
if

F ig . 2-3 . 7Β 71 Test
Set
up C h art .
O
p erating Instructions-7B71
2-5

O p erating Instructions
 71371
n ecessary . Allow five
m
i
n utes warmu
p before performing
t h is proce d ure .
1 . Connect αone-k ilo h ertz calibrator signal from the
In d
icator
Oscillosco p e Cali b rator
to
t he V ertical unit in p
ut
conn ector .
2 . Set t h e ΤΙΜΕ /DI V switc h to 1 ms an d p ress t he to p
T R IGG ER I NG and Β D EL AY M OD E pu s hb utto n s .
3 . Set t
he V
ertical
unit to d
isplay at least two divisions
of
t he signal vertically .
4 .
C
h
ec
k t he CR T d
is p lay for one co m plete cycle p er
d ivisio
n
.
5 . If necessary, ad j ust t he S WP CA L a d ju stment for one
com
p
lete cycle per division .
Si
m
plifie d O p erating Instructions
T he following information is p rovi d e d to ai d in q uic k ly
obtaining t he correct settings for t he 71371 to p resent α
display . T he o p erato r s h oul d be familiar with t he com p lete
functio n an d o pe r ation of t he unit as d escribe d in this
section before usi ng t h is p roce d ure .
Normal Swee p . T he followi ng p roce dure will
provide a
stable d isplay
for most n ormal-sweep a pp
lications .
1 . Select the TRIGG ER
I
N
G M ODE, CO UPL I N G an d
SOUR C E w h ic h fit t he r e q ui r
ements of t h e signal to be
d isplaye d .
2 . Tu rn t h e LEVEL
/SL O
PE
control to t he d esire d slo pe .
3 . If the green 'TRIG"D lig h t is n ot on, a dj ust the
'LEV EL /S L O PE control t hr oug h out the ra nge of t he selec-
te d slo p e until t he TRIG"D lig h t comes on . If the lig ht d oes
n ot come on at any
setti
ng of
t he LEVEL
/S L
O PE control,
t
he
tr
igger sig
n al is i n a de q uate or t
he
CO U
PL
I N G and
SO UR CE switc h es are set i n correctly .
4 . Set the ΤΙΜΕ /DI V switc h and P OSITIO N control for
αd isplay w h ic h remains on t he d is p lay area h orizontally
(V
A R IA BLE control s h oul dbe in CA Lp osition for cali-
b rate d swee p rates) .
5 . If t he d is p lay d oes not start at t he correct point
on
.t he waveform, rea d j ust t he L E VEL /S L O PE control for t h e
d esire d triggeri n g .
2-6
M agnifie d Swee p . Α
magnifie d -swee p d is p lay can b e
ob
tained as follows after αn ormal-swee p d is p lay is obtaine d
as
given in steps 1-5 above .
1 . A d j ust t h e
P
OSITIO N control to move t h e area to be
m agn ifie d wit h in t he ce n ter d ivision of t he C R T .
2 . If necessary, change t he ΤΙΜΕ /DI V switc h setting so
the co m plete area to be magnified is with in t he center d ivi-
sio n .
3 .
P
ress t he X10-MAGNIFIER pus h -butto n .
4 . U se t he fi ne range of t he P OSITIO N control
to
establis h precise p ositio n ing of t h e m agnifie d d isplay .
Delaye d Swee p . T he followi n g p rocedure can b e use d to
o b tain αd elaye d -swee p
dis p lay w hen t he 71371 is use d in an
oscillosco p e t h at h as d ual time
base ca p abilities and w h en
use d wit hα compa n ion
d elaye d -swee p unit ( Β ) . Obtain α
d is p lay as give n in ste p s 1-5
un d er Normal Swee p . Then
procee d as follows :
1 .
Pr ess t h e Β STA R TS A F TE R D EL AY push -button .
2 .
Set
t
he i
n
d
icator
oscillosco pe h orizontal mo de to dis-
play the Α time base (71371) .
3 .
Set the time/ d ivision switc h of t h e
com p a n ion
d elaye d -swee
p unit ( Β ) so t he inte n sifie d zone
on
t h
e dis-
play is t he d esired
lengt h (i n tensified zone will bed is p laye d
in d
elayed
form) .
If t he intensified zone is not visible,
a dj ust
t
he
in d icato r i n te n sity controls .
4 . Ad j ust t he D EL AY
TIMEMUL" Τ` d ial to p osition t he
i n te n sified zone to t he portio n
of t he d is p lay to be d elayed .
5 . Set t he in d icato r
oscillosco p e h ori z ontal mo de to dis-
play t h e Β time
base ( d elaye d swee p u n it) .
6 .

If αd elaye d sweepwith less j itter is desire d , p ress t he
71371 Β TRIGG ER A BLE A F TE R D EL AY p us h -b u tto n .
T he
triggering controls of t h e com p anio n d elayed-sweep
u nit ( Β ) m u st be set
to obtain α stable d is p lay . See t he
instr u ction manual for that unit for furt h er
information .
P
us h butto n Switc h L ogic
T he 'TRIGG ER I N G M OD E , CO UPL I NG and SOUR C E
switc
h es an d t he Β DE L AY M OD E switch are arrange d in α

sequence w h ic h p laces th e m
ostoften-used positio nat the
top of eac h series of p us h buttons . W it h
t
h
is ar r a n gement, α
stable d is p lay can usually be o b taine d by p r
essing t he to p
p us h
-b
u
tto
ns ; Ρ - Ρ
AU TO, AC, ΙΝΤ a n d I N DEPE N D EN T .
Wh en an
a
d eq
uate t
r
igger signal is app lied, t he unit is trig-
gere d as i n dicate d by
t
he
illumi n ated TRIG'D lig h t at any
setting of the LEVEL /S L
O
P E
control . If t h e T R IG'D lig h t
is n ot on, eit h er t he trigger
signal a p plie d to t h is unit from
t h e vertical u n it is i na d eq uate or
it is below t he lower fr e-
quency limit of t he ACCO UPL I NG
switc hp osition . If the
d esire d d is p lay is not
o
b
tained wit h t he pu s hb utto n s
p us he d in, ot h er selections
must be ma d e . Refer to t he
following d iscussions or t he
instruction manuals for t he
associate d in d icator oscilloscope
an d vertical unit for more
informatio n .
T riggere d L ig h t
The 7RIG'D lig h t pr ovides
α convenient in d ication of t h e
con
ditio n of t he triggeri ng circuits . If t he T R IGG ER I N G
controls a r e correctly set an d an adeq uate trigge r signal is
ap
plie d , t
he
ΤR IG'D lig ht is on . Un d er certain con d itions,
t he TRIG'D lig h t may be off, in d icating t h at t he swee p
is
n ot triggere d . T he cause migh t be
α misa d
j
uste d LEV EL/
SL O PE control, i n correctly set
CO UPL I
N
G or SO UR C E
switc h es, low t r igge r signal am p litu d e,
o
r
α trigger sig n al
re p etitio n r ate outsi de t heaccep table f r equency
range . T h is
feature can be use d as α general in d ication of correct
trig-
ge r ing . It is p a r ticularly useful w h en setti ng up
t
he
trigger
circuits w hen α trigger signal is available wit
hout α d is p lay
on the CRT . It also in d icates th at t h is u n
it is co
r
rectly
tr
iggere d w h en op erating as α delayi n g-swee p unit ( Α ) .
α :
ι c ιν υυαι rιcα ;
INN
.-
,-_ +
p r ε
» ιι
Fig . 2-4 . View of fro n t panel s h owi ng pu s h-bu tto n s associate d wit h
t h e M OD E , CO UPL I NG a nd SO UR CE switc h es .
COUPLING
SOU R CE
pus h buttons !! p us h b u ttons
Trigger M ode
O perating Instructions-71371
The p us hbuttons locate d un d er t he M ODE title
(see
F
ig .
2-4) select t he mo d e in w h ic h t he sweep
is triggered . T he
selected mo d e is indicate d by α
lig
h
te dp us hb utto n .
iι e LEVEL
/S L O
P E
c υιι t r οΙ can be set so t he d is p layed wavefo r m
starts at any
p oint with in th is r a n ge on eit h er slo p e .
In t
he Ρ - Ρ
A U TO
mode, t he trigger circuit automatically
com
p
ensates fo r
c h anges in trigger signal am p
litude
for
signals above t he
minimum amplitude re q uire m
ent . Therefore, if t he
L E VEL /S L O PE con trol is set so
t
he
dis p laye d waveform
sta r ts at α certain pe r ce n
tage-point on the lea d ing ed ge of α
low-amplitude signal, it triggers
at the same p ercentage-
point on t h e lea d i ng ed ge of α h ig h-amp
litude sig n al if t he
LE V EL /S L O PE control is n
ot chan ge d . T h is op eration is
illustrate d in F ig . 2-5 .
Wh en t h e t r igger re p etition rate is belowabout 200 h ertz
(o r outsi de t hef r e q uency range selecte d by t h e CO UPL I N G
switc h ), or w hen t h e trigge r signal is ina d equate, t he swee p
free
ru
n s
at
t he sweep
rate in d icate d by 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
nap
p lie d , t he
f
r ee-
running con d itio n end s a n d α triggere
d display is pr ese n te d .
Τ h - ~

node is p articularly useful w h en
ob servi ng
α
se r ies
of waveforms, since it is not necessary to
reset
t
he LEVEL
/S L O
PE
control for each observatio n .
Also, because of t h e ease of obtaining α triggere d dis p lay in
th is mo d e, t he Ρ - Ρ A U TO trigge r mo de can be used for
most ap plications and t h e remaining mo d es used only for
s p ecial a pp lications o r w hen sta b le triggering is not obtain-
able in t h is mode .,-~

~
ι N hen t he AU TO pu s h -button is il f uminate d , α
t r iggered d is p lay is prese n ted wit h t he correct setting of
t
he
L EVEL /S L O PE control (see
T
r
igge r L evel d iscussion)
w h enever an ade q uate trigge r
signal is a p p lie d . T he range of
t he LEVEL /S L O PE control i n t h is
mo
de
is ±8 vertical divi-
sions . The TRIG'D lig h t indicates w hen
t he d is p lay is
triggere d .
Wh e n t he trigger repetitio n r ate is b elow
about 30 h ertz
(or outsi dethe fre q ue ncy ra n ge selected
by t he CO UPL I NG
SNι
it r !
, 1
υ V ηεη all ad e q uate it igger signal is agai n
applie
d ,t he free-
running condition e nd
s andα triggere d d is p lay is p resente d .
2-7

Op erating Instructions  71371
F ig . 2-5 . LEVEL /S L O PE control op eration for (P-P) AU TO mo d e t r iggeri n g .
(
Α
)
LE VE L /S L O PE co n trol set so dis p laye d waveform starts at
a b o u t 25% poi n t of α two- d ivisio n waveform .
(
Β
)
displayed waveform still triggere d at a b o u t 25% of lea d i ng ed ge, w h e n sig n al amplitude
increases to pro d u ce α six- d ivision d is p lay
(L
E VEL /S L O PE control at same setti n g for bot h waveforms) .
Wh
en
t h eL E VEL
/SL
O PE control is at α setting outsi de t he
am p litu
de range of t he trigger signal, t he swee p also free
ru n s at t
he swee p r ate i nd icate d by the ΤΙΜΕ /DI V switc h .
T h is ty p e of f r ee-ru n ning d is p lay can be useful,w hen it is
d esire d to meas u r e o n ly t he maximum p eak -to- p ea k am p li-
tude of α signal with out observing t he waves hap e (suc h as in
b an d wid t h meas u rements) .
~ Nh
en
t he NORM η us h - b ιι tt οη is p ressed,
. Γh
e range of the LEVEL /S L O PE control in th is
mode
is ±8 vertical divisions . T he T R IG"D lig h t i n d icates
w h en t he d is p lay is triggere d .
T h e NORM trigger mo de m u st be used to p ro d uce trig-
gere d d isplays with trigge r re p etitio n rates below about 30
h ertz . Wh en t he LEVEL /S L O PE control is at α setting out-
si de t he am p lit u de range of t h e trigger signal, w hen t he
trigger re p etition rate is outside t he fre quency range selec-
te d b y t he CO UPL I NG switc h or
SI NG LE S WP . Wh e n t he signal to be d is p laye d is not
re p etitive or
varies in amplitu d e, waves hape or repetition
rate, α conventional re p etitive ty p
e
dis
p
lay may produce an
un stable p resentation . Α stable dis p lay can
often be obtain-
ed u n d er t
h ese circumsta n ces b y u sing t he single-sweep
feature of t
h is unit . T he
SI
NG LE S WP M ODE is also useful
to p
h otogra
ph non-repetitive
or unstable d isplays .
To obtai
nα single-s w ee p display of α re p etitive sig n al,
first obtain t he best possible d is p lay in t he NORM M OD E .
2-8
Then with out c h anging t h e oth er TRIGG
ER
I
N G controls,
p ress t he
SI
N G LE
S
WP p u s hb utton . Wh en rea dy to view
t he single-swee p dis p lay, p ress t h e RE S E T- R EADY pu s h-
b utto n . Α single trace is p r esente d each time t he RESET-
READY pushbutton is pressed, (as long as t h e repetitive
signal remains connected to t he system an dTRIGGERIN G
controls are correctly set) and furt h er swee p s cannot be
p resente d until the RE SE T- R EADY p us h button is p ressed
again . If t h e d is p laye d sig n al is α com p lex waveform com-
p ose d of
p ulses of varying am p litu d e, successive single-
sweep d is p lays may not
start
at
t
he same
p
oi
n t
of
t he wave-
form . To avoid confusion d ue to t h e CR T p ersistence, allow
t he d is p lay to d ecay before p r essi n g t
h e R ES E T-READY
p us hb utton again . At fast sweep rates, it may be difficult to
view t he single-swee p d is p lay . T h e app arent trace intensity
can be increase d by re d uci ng t he ambie n t lig h t level or
using α viewing hoo d as recommen ded in the in d icator
instructio n manual .
Non-repetitive, ran d om signals can
be displayed in t h e
single-swee p mo de by
first ob taining t h e best possible dis-
play in the N O RM
M
OD
E with α signal w h ic h is about the
same amplit ude an d fre q uency as
t
he ra nd om signal
. T h en
without ch anging t he ot h er TR IGG ER I NG controls, pr
ess
t
he
SI
NG
LE S
WP p
u s
hb
utton
. Wh en rea dy for t h e ran d om
signal, p ress t he RE S E T- RE ADY p u s hb utto n . T he RE SE T-
RE ADY p us h button remains lig h ted to indicate t h at the
un it h as b een reset and is rea d y to p ro duce α swee p . T he
lig h t goes out after t he ran d om signal triggers t h e unit . To
p repare t he unit for
an ot
h
er single-sweep display, press t he
RE
SET-READY p us hbu tton
again .
Wh en u si ng t he single-sweep mo de to
p h otog
r aph wave-
forms, t he graticule must be ph otog r a ph ed
se p arately i n t he
nor m al manner to p reve n t over-ex p osi ng
t
h e
film . Be sure

t he camera system is well
p
r otecte
d
against
stray lig h t, o r
operate t he system in α
dar kened room . For repetitive
waveforms, p ress t he RE
S
E
T-READY push bu tton only
once for eac h waveform unless
t h e signal is com p letely
symmetrical . Ot h erwise, multi p le waveforms
may appear on
t he film . F or ra nd om signals,
t
h e
camera lens can be left
o
p en
un
til t he
ran
d om signal triggers t he unit (RE S E T-
RE ADY p us h butto n lig h te d ) . F urt h er information on
p hotog
r aph ic tec h niques is given in t he camera instructio n
ma n ual .
ι he pus hb uttons locate d below the CO UPL I N G title
(see F ig . 2-4) select t he met h od i n w h ic h t he trigge r sig n al is
conn ecte d to t he tr igger ci r cuits . T he selecte d cou p ling is
in d
icate dby α
lig h
te
d p
us
h
butto n .
E
ac h p osition permits
selection
or re j
ectio n of
t he
fre q uency
com po n e n ts of t he
trigger signal w h
ic
h trigger
t
he swee
p .
F
ig . 2-6 gra ph ically
illustrates t he ban d of fre q uencies
cove r ed b y eac h position
of t he CO UPL I N G switc h .
In ge
n eral,
ACCO UPL I NG can be use d for most
αμμιι cαt
ίοη s .
H owever, if
t he signal contains u n wante d fre-
que
n
cy com p onents or if the sweep is to be triggered at α
low re p etition rate or DC level,
one of the r emaining
CO UPL I N G switc h p ositio n s
will p rovi de α bette r d is p lay .
T he t r iggering p oint
in t
he
AC p ositio n d ep en d s upon
t he average voltage level
of t he trigge r signal . If t he trigger
signal occu rs
randomly, t he average voltage level will vary,
causi ng the
trigge r i ng p oint to vary also .
This
s h ift
of t
he
triggering point may be enoug h so it is imp
ossible to main-
tai n α stable d is p lay . In such cases, use
DC cou p li ng .
AC LF REJ .
In t he AC LF REJ positio n , DC is re j ecte
d
an d
low-frequency trigger signals below about 30 kilo h ertz
are attenuate d .
T
h
erefore, the swee p is triggere d only by
t he h ig h er-fre que n
cy com
pon
ents of t he trigger signal .
This
position is p articularly
useful for p rovi d ing sta b le triggering
if the trigger signal
con tains line-fre q uency com p one n ts .
Also, t he AC LF REJ p ositio n p
rovi d es t h e best alternate-
mo d e vertical d is p lays at fast
sweep rates w hen com p aring
two or more unrelate d signals (wit h
d ual-trace vertical or
slave d triggering op eration for d ual-vertical
unit op eration) .
AC HF REJ .
T h e AC H F REJ p ositio n p asses all low-
frequency signals between about 30 hertz and 50 kilo h ertz .
DC is re j ecte d and signals
outsi de t he above range are atte n -
uate d . Wh en triggering from
com p lex waveforms, t h is posi-
tion is useful for provi d ing sta b le
display of t he low-
frequency com p onents .
O p erati ng Instructions-7871
200 MHz

Operating Instructions - 7 Β 71
DC . DCCO UPL I N G can be use d to p rovi de stable trig-
gering with low-frequency signals w
h
ic
h
woul d be atten-
uate
d i n t he ot h er mo d es, or wit h
low-repetition
rate
sig n als . It can also be use d to t r igger t he swee p w hen the
trigge r sig n al r eac h es α DC level selecte d b y the setting of
t he LE VEL /S L O PE con trol . Wh en usi n g i n te rn al triggering,
t h e setting of the vertical unit p osition controls affects the
DC triggering p oint .
Trigger Source
T he p us h buttons located below t he SO UR CE title (see
F ig . 2-4) select t he source of t he trigger sig n al w h ic h is
conn ecte d to t h e trigger circuits . T he selected source is i nd i-
cated by α lig h te d pushbutton .
INT . In t he ΙΝΤ position of t he SOUR C E switc h , the
trigger signal is
derived f
r om
t he
associate d vertical un it .
F urt he r selectio n of t he inter n al trigge r signal may be pro
vided by t he associated vertical unit or in d icator oscillo-
sco pe ; see t h e instruction manuals for t h ese i nstrumen ts for
i n formatio n . F or most a p plications, the ΙΝΤ -SO UR CE p osi-
tio n can be used . However, some applications re q uire
special triggering w h ic h ca nnot be ob taine d in t he ΙΝΤ -
SO UR CE position . In suc h cases L I N E- or ΕΧΤ -SO UR C E
must b e use d .
LINE . T he L I NE
p
ositio n of t he SO UR C E switc h con-
nects α sam
p
le of t h e
p
ower-line voltage, to w h ic h t he i n d i-
cato
r
oscillosco p e is connected , to t h e trigger ci r cuit . L ine
triggering is
useful
w h en
the in pu t sig n al is time- r elate d
( m ulti p le
or su
b -multiple)
to t
h
e line fre q uency . It is also
useful for p rovi d ing α stable d is p
lay of α line-frequency
com p onent in α complex waveform .
EXT . An external signal connected
to t
he ΕΧΤ
T R IG
IN connecto r can be use d to trigger t he swee p
in t
he ΕΧΤ
-
SO UR CEp ositio n . T he external signal must be time-relate
d
to t he d is p laye d waveform for
α
stable
d is p lay . An exte rn al
trigger sig n al
can be used to p rovi de α triggere d d is p lay
w he n t h e i n te rn
al
signal is
too low i n am p litu de for correct
triggering or con tai ns sig n
al compone n ts on w h ic h it is not
d esire d
to t r
igger
. It is also useful w hen sig n al tracing in
am p
lifiers, ph ase-s h ift n etwor k s, wave-s hap ing circuits, etc .
T he sig
n al
fr
o m α single p oint in t he circuit u nd er test can
be connecte d to t h e ΕΧΤ TRIG IN con nector t hroug h α
probe or cable . 'The swee p is t hen triggere d b y t he same
signal at all times and allows a m plit ud e, time relatio n s h i p or
waves hape ch anges of signals at various points in t h e circuit
to be examine d wit hout resetting t he TRIGG ER I N G
co n trols .
ΕΧΤ -

10 .
Operatio n in the ΕΧΤ
-
10 p ositio n is t he
sa
m e
as d escribe d fo
r ΕΧΤ
except t h at t h e external signal is
attenuate d 10 times . Attenu ation of h ig h -am p litu de exte r -
2-10
ηαΙ trigge r sig n als is desirable to b roa d en t he range of t he
LEVEL /S L O PE co n t r ol .
Trigger
Slo p e
The L E V EL /S L O PE co n trol d etermines w h et h er t he
trigger circuit res pon d s on t he p ositive-going or n egative-
going portion of t h e trigger signal . Wh en t he i nd icator line
on t he ou ter ring of t h e LEVEL /S L O PE control is to t he
left of center, t he d is p lay starts on t h e positive-goi ng por-
tio n
of t
he
waveform (notice positive-going waveform to
left
of con trol
.
To t he rig h t of ce n ter, t h e d is p lay starts on
the n
egative-going p ortion of t h e waveform (notice
n egative-going waveform) .
T h e effect of t h e LEVEL /
SL O PE control
on the
d is p
laye d waveform is s h ow n in F ig .
2-7 . W hen seve r al cycles of α signal
app ear in t he dis p lay,
t he selection of t h e trigger slope is often
unim p orta n t .
However, if only α certain p o r tio
n of α cycle is to be d is-
p laye d , correct setting
of t
he
LEVEL /S L O PE con trol is
im p o r ta n t to p rovi d e α d isplay
w h ic h starts on t he d esired
slo p e of t he in p ut signal .
Trigger L evel
T he LE VEL /S L O PE con trol d
etermines t he voltage level
on t he trigger signal at w h ic h t he d
is p lay is tr iggere d , as well
as selecting the trigger
slo p e . The center kn ob of t h e
LEVEL /S L O PE control provi d es
about α3 :1 reductio n in
relation to t he outer i nd
icator ri n g, to allow p recise level
selection . T h is control can also be tu rn e d t h roug hout the
complete 360 ° rotatio n to allow continuous triggering over
t h e selecte d slo p e . T h is is p articularly useful i n t he Ρ - Ρ
AU TO M OD E . Wh en t he LEVE L/S L O PE control is set to
t h e "" Ο "" on eit h er t he p ositive-going or negative-going wave-
form, t he swee p is triggere d near t he zero-volt level of the
trigger sig n al . As t h e LEV EL/S L O PE control is rotated
away from the "" Ο "", t he d is p laye d wavefo r m sta r
ts at α
p oi n t co r res po nd ing to t h e position of t he i n dicator line
on
the associate d slope waveform (wit h i n am p litu de range of
trigger signal
exce p t in
Ρ - Ρ
AU TO M OD E w h ic hp rovi d es
triggere d dis p lay t h
roug
hout
entire slo p e) . F or example if
t he LEVEL /S L O PE
co n trol is turne d cloc k wise from t he
"" Ο "' on the p ositive-going
slo p e, t he d is p laye d wavefor m
starts at α more positive level . F
ig . 2-7 illustrates t h e o p era-
tion of t he L E VEL /S L O PE con trol at
different levels an d
slo p es of αd is p laye d waveform .
B efore
setting t he triggering level, select t h e
TR IG-
G ER I N
G SLOPE, M ODE, CO UPL I NG an d SOUR CE . T hen
a d j ust t he LEVEL
/S L O
PE
control so t he d is p laye d wave-
form starts at
t
he
d esire d p oi n t . T he t r iggeri ng slo pe can be
c h anged
at any time by rotati n g t he LEV E L /S L O P E con-
trol to t he corres p
on d ing p oi n t on t he oth er slope
waveform .

O p erating
Instructions-7B71
C RT d isplays
o
b tained wit h
LEVEL/SLOPE
co
ntr
ol in
p ositive-slo pe
r egio n
C R T d isplays
obtained wit h
LE V E L /S L O PE
control in
negative-slope
r egion
LEV EL %S L β Pt
0000
0000
*000
0000

O p erating Instructions-713711
H orizontal SweepR ate
The ΤΙΜΕ /DI V switc h p r ovides 26 calibrated swee p
rates ranging from 0 .02 microsecond/division to five
seconds/division . T he VA R IA BLE ΤΙΜΕ /DI V co n trol must
be in th e cali b rated position and t he MAG N I
F IER
at Χ 1
for the indicated sweep rate . T he VA R IA BLE ΤΙΜΕ
/DI V
control incorporates α two-position switchto determine if
t h e swee p rate is calibrated or uncalibrated . Wh en t he
V A R IA BL E k nob is i n t he i n ward positio n , the VA R I-
A BLE ΤΙΜΕ /DI V control is i noperative and t he sweep rate
is calibrated . W henpressed and released, t h e VA R IA BLE
k nob moves outward to activate t he V A R IA BLE TIME/
DI V cont r ol fo r uncali b rated sweep rates . Α calibrated
sweep rate can be obtained at any position of t he VARI-
ABLE ΤΙΜΕ /DI V control by pressing in t he VA R IA BLE
k nob . T h is feature is useful w hen α specific uncalibrated
sweep rate h as been obtained and it is desired to switch
b etween t h is
un
calibrated sweep rate and α calibrated sweep
rate
.
Switc
h ing from uncalibrated to calibrated o peration or
vice versa does not affect t
h
e setting of t he
V
A
R
IA
BLE
ΤΙΜΕ /DI V control . The VA R IA BLE ΤΙΜΕ /DI V control
allows the swee p rate in each ΤΙΜΕ /DI V switch position to
be reduced to at least t he sweep rate of the next ad
j acent
switc h position . T h is provides an overall uncalibrated vari-
able swee p rate range from 20 n anoseconds/division
(from
2 n
anoseco n ds/division
with MAG N
I
F I ER
at
Χ 10) to about
12 .5 seconds/division
.
Wh
en
m
ak ing time measurements from t h e graticule, t he
area
between t he second-division and tent h -divisio n vertical
li n es of t he graticule provides t h e most linear time measure-
ment (see Fig . 2-8) . Therefore, t h e first and
last divisio n of
t hed isplay area sh ould not be used w hen
ma k ing accurate
time measurements . Position t he start of t he timing
area to
t he second-division
vertical line (second line
from t
he
left)
and ad j ust the ΤΙΜΕ /DI V switc h so t h
e
end
of t
he
timing
area falls between t he second-division
and tenth -division
vertical lines .
Swe c p M annifier
E quivalent lengt hof t he magnified sweep is more t h an 100
divisions ; any 10-division portion can be viewed by
ad j usti n g t he h o r izontal POSITIO N control to bring t h e
desired portion o nto t he viewing area . T he dual-ra nge
feature of t he h orizontal
POSITION
control is particularly
usef u l w hen t h e MAG N I F I ER isset to Χ 10 (see Horizo n tal
P ositio nCo n trol discussio n w h ic hfollows) .
To use swee pmag n ification, fi r st move t he portion of
thed isplay w h ic h is to be expanded to t he center of t h e
gratic u le . 'T hen press t he X10-MAGNIFIER pus h button ;
t he Χ 10 b utton lig h ts to indicate t h at t he h orizontal sweep
rate is magnified . Wh enever t he
X10-MAGNIFIER p us h -
2-12
Fig . 2-8 . Area of gratic u le used for acc u rate time m eas ur e m ents .
( Α ) Unm ag n ifie d
W aveform
( Β ) M agnified W
aveform
F ig .
2-9 . O p eratio n of swee p magnifier .