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Tektronix 454A - Page 363

Tektronix 454A
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MOD
210
R
,
S, ¤
,
and
U
Al l
Ser i al
Num
b
er s
St ep
27
( cont )
( 1)
Set
t
h
e
¤™œ
/ DI
V
swi t c
h t o
1
ms
.
( 2)
Set
t
h
e
t i me- mar
k
gener at or
f or
0
. 1
ms
mar
k
er s
.
( 3)
P
osi t i on
t he
cent er
ei g
h
t - di vi si on
por t i on
of
t h
e
t ot al
magni f i e
d
sweep
i nt o
t
h
e
vi ewi ng
ar ea,
t
h
en
posi t i on
t
h
e
l ef t
mar
k
er
at
t
he
1st
di vi si on gr at i cul e
l i ne
.
( 4) C
HE
C
K
- - T
h
at
t h
e
mar
k
er at
t
h
e
9t
h
d
i vi si on
gr at i cul e
l i ne
i s
wi t
h
i n
t
h
e
t ol er ance
st at ed
a
b
ove
( 3%
or
0
. 24
ma
j
or
di vi si on)
.
c
.
Set
t
h
e
HO
R
I Z
DI S
PL
AY
swi t c
h
t o
( D
ELAY
ED S
WEEP)
.
d
.
C
HE
CK- - U
si ng
t h
e
and
¤™œ
/ DI
V
swi t c
h
and
t i me- mar
k
gener at or
set t i ngs
gi ven
i n
Ta
b
l e
5- 3,
c
h
ec
k
magni f i e
d
sweep t i mi ng
over
t
h
e
mi ddl e
ei g
h
t
d
i vi si ons
of
t
h
e
magni f i ed
di spl ay
.
N
ot e
t
h
e
por t i ons
of
t
h
e
t ot al
magni f i e
d
sweep
l engt
h
t o
be
excl uded
f
r om
t
h
e
measur ement
.
M
agni f i er
l i g
h
t
must
be on
.
T
h
e . 02
us
and
. 05
us
set t i ngs
s h
oul d
b
e
wi t
h
i n
4%
( 0 . 32
ma
j
or
di vi si on)
over
t
h
e
cent er
ei g
h
t
di vi si ons,
or
5%
( 0
. 10
ma
j
or
di vi si on) wi t
h i n
any
t wo
d
i vi si on
por t i on
of
t
he
cent er
ei g
h
t
di vi si ons
.
T
h
e
. 1 us
t
h
r oug
h
. 5
us
set t i ngs
s h
oul d
be
wi t
h i n
4%
( 0 . 32
ma
j
or
di vi si on) ,
t
h
e
1
. 0
u
s
t h
r oug
h
50
ms
set t i ngs
wi t
h
i n
3%
( 0 . 24
ma
j
or
di vi si on) ,
and
t
h
e
. 1
s
t
h
r oug
h
. 5
s
set t i ngs
wi t
h
i n 6%
( 0 . 48
ma
j
or
di vi si on) over
any
por t i on
of
t
h e
mi d
d
l e
ei g
h
t
di vi si ons
.
e
.
CA
L
I
BR
ATI O
N
- - See
st ep
28
of
A
dj
ust ment
p
r ocedur e
.
P
age
5- 23
TA
BLE
5- 4
CH
A
NG
E
:
T
he
t i t l e
of
t
he
t abl e
t o r
ead
:
Del ay
Ti me
Accur acy
C
H
A
NG
E
:
" Al l owa
b
l e
Er r or
f or
Gi ven
Accur acy"
i n
Ta
bl e
5- 4 f or
t
h
e . 1
us
t
h
r oug
h
50
ms
¤™œ
/ DI
V
swi t c
h
set t i ngs
t o r
ead
:
±6
mi nor
di al
di vi si ons
( 0
. 75%)
P
age
5- 23
St ep
29
REPL
AC
E
:
The
ent i r e
st ep
wi t
h
t
h
e
f ol l owi ng
:
29
.
C
h
ec
k
Di f f er ent i al Ti me
Measur ement
±
.
Appl y
50
ns
t i me
mar
k
s
f r om
t
h
e
t i me- mar
k
gener at or
.

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