Tektronix 2235 - Dc Restorer

O pe r ati ng Pr oce du res-2235 ΑΝ / US M -488
O p e r ato r s
I
NT EN SI F I E D ZONE
TO BE
M
AG N
I
F I ED
4 . Set t he Α S E C/DI V switc h
to d isplay t
h
e measu r e-
°°

ment p oints of i n terest on t h e waveform .
Ensu r e t h at t h e
Α
T R
AC
E
t

SE C/DI VV aria b le control
is in t
h
e CA L dete n t .
L
Nt
CEΒ T R A

5 . Select ALT H O R IZO N TA L M
OD E an da dju st b ot h t he
app ropriate vertical P OSITIO N
co
n
t
r
ol a nd Α / ΒS WP S EP
ό

---

control to dis p lay t h e Α t r ace ab ove t h
e
Β
trace (see F igu r e
4-13) .
ME
AS
URE
~ Ι
~-
J ITT ER
TIME FROM --- I
TO

(0
F
ig ur e 4-12 . Pulse j itte r .
2 . Ad j ust t h e Β TR IGG ER LEVEL
co
n trol
so t h e i n te n si-
fied zone on t he Α trace is stable .
ΝΟΤΕ
Th e intensified zone see n in t he A LT H
OR IZO N TA L
M OD E dis p lay will move f r om t r igge r
point to t r igger
point as t he Β DE LAY TIME P OSITION
co n trol is
r otate d .
3 . T he app are n t magnification facto r
can b e calc u lated
from t h e formu la sh own in ste p8 of t he " M agnifie
d Swee p
Ru ns After Delay" pr oced ur e .
DEL AY E D-S WEEP TIME ME AS UREMEN
TS
O pe r ati n g t h is instrument wit h t he H
O
R IZO
N TA L M OD E
set to eit h er ALT or Β will p ermit time
measurements to b e
ma de wit h α greater deg r ee of accuracy t h
an attained wit h
H OR IZO N TA L M OD E set to Α . T he followi n g
pr oce d ures
desc
r
ibe h ow t h esemeasurements are
accom
p lis
h e d .
Time Differe n ceon Si n gle W aveform
4732-11
3 . Set t h e
appr o pr iate VO L TS/DI V switc h to p r oduce α
dis p lay of a pp roximately 2 or 3 d ivisions in
am p litu de .
6 . Set t he Β S E C/DI V switc h
to
t h
e fastest swee p s p eed
th at pr ovi d es α usea b le (visi b le) intensifie d
zone .
Α T R AC E
B TRACE
IN T EN SIF I E D
/ ZONE
A L T
HO
R IZ DIS
PL
AY

\
VER TICAL
REFEREN C E L I NE
F
igure 4-13 . Ti m e d iffe r en ce on si n gle
wavefo
rm .
C4207-23
To measu r e time b etween two
poi n ts on α waveform,
use t h e following procedure :

7 . A
d ju st t heΒ D ELAY TIME P OSITIO N con tr ol to move
1 . Pr eset i n st r ument controls
a
n
d obtai n α baseline

t h
e
intensified
zo ne to t he leadi ng edge on t h e first point of
trace .

i n
te
r
est (on t he Α trace) ; t hen fine ad ju st u ntil t he selected
p o r tio n (on t h eΒ
trace) is centere d at any conve n ie n t verti-
cal gratic u le line
(see
F igure 4-13)
.
2 . Apply t he sig n al to eit h er vertical-c h
an
n
el i np ut con -
n ecto r and set t he VER TICA L M OD E switc h
to d isplay t h e
c
h
ann el use d .

8 . Recor d t he Β D ELAY
TIME P OSITIO N d ial setting .