Tektronix 2213 - Page 79

A dj ustment Procedure-2213 Se
r
vice
e . Set t he Χ 10
M ag n ifier off ( kno b i n) .
f . C HE C K -T h ere is
no d iscerna b le s h ift in t h e time
mar k er w h en switc
h ing between Χ 10 M ag n ifier on and Χ 10
M agnifier off .
g . T u rn
t he Χ 10 M agnifie r on ( knob
o u t) a nd re p eat
p arts b t
hr ough e until no f u rt h er imp
rovemen t is note d .
3 . A d j ust 5- μ s Timi ng (C626)
α . Set t he SE C/DI
V
switc
h to 5μ s .
b
. Select 5- μ s time mar k ers from t
h
e
time-ma rk
ge n erator .
ε . AD JU
ST-5 μ s Timing (C626) for 1 time mar k er
per
d ivision across t
he graticule area .
4 . A dj ust H ig h -S p ee d Timing
(C754, C774,C784,
an d C734)
α . Set t h e S E C/DI
V switc h to 0 .05 μ s .
b .
Select 50- n s time mar ke rs from t
he time-ma rk
generator .
ε . AD
JU ST-50 ns L inearity (C754)
for e qu ally spaced
time mar
k e r
s at
t he start of t he swee p .
d . Set t h e Χ 10 M
agnifier
on
( knob out) and select 10-ns
time mar k e r s from t he time-mar
k generator .
e .
AD
JU ST-5 ns Timing (C774 an d C784) alte
r nately
for one time
mar ke r eve r y 2 divisio n s over t h e center 8
divisions of t h e mag n ifie d
sweep .
f . A d ju st t h e H orizo n tal
P OSITIO N control so t h at the
5t
h time mar k er is aligned with t
h
e 2n
d vertical graticule
li ne .
ΝΟΤΕ
/ η t
he next part, keep the adjustment
screws for
C774 and C784 as close to
the same length as possible .
g . AD JU ST-5 n s L inea r ity (C734)
fo r one time mar k er
every 2 divisions ove
r t h e ce n ter
8
d ivisions of t h e mag-
nifie d sweep . A
dj ust t h e H orizo n tal P OSITIO N control to
ch ec
k
t
h e li n ea r ity to t he 15t h time mar k er .
h . R epeat parts e t h ro u g
h g u ntil no furt h er improve-
me nt is note d .
i .

Set t h e

X10 M
agnifier off ( kno b in) and recenter t he
trace using t he H orizo n tal
P OSITIO N cont r ol .
R epeat p arts b t hroug
h i un til
no
furt h er imp rove-
j .
ment is noted .
5 . C
h
ec
k Timing Accuracy
α . Select 50-ns time
mar
k ers
from t h e time- m ar k
generator .
b . U se t
h e
C
h annel 1 P OSITIO N control to center
t he
t
r
ace
vertically . A dj ust t he T R IGG ER LEVEL
control
for α sta b le, t r iggered dis p lay .
ε . U se t
h e H orizontal P OSITIO N control to align t
h e
first time
mar k er t h at is 50 ns b eyond t h e start of t h
e
sweep wit h t he 2nd vertical g r aticule line .
When making timing measu r ements, u se as α
reference
the same
point
on
eachtime marker .
d . C HE C K -Timing
acc u racy is with in t he limits s h own
in Ta b le 5-6 for the a pp lica b le p osition
of
t
he
Χ 10
M ag-
nifier
.
Wh
en ma k ing t he ch ec k with t he Χ 10 M ag
n ifie r
On,
exclude any
portion of t h e sweep past t h e 100th
magnifie d
d ivision .
Χ 10 M agnifier
Off ( k nob i n )
On ( k nob o u t)
ΝΟΤΕ
Table 5-6
Timi n g Accuracy
Accuracy at 10th V ertical Gratic
u
le
L ine
3°/ α (0
.24 d ivisio n )
5%
(0 .40
divisio n )
e . Repeat
parts b t h ro u g h d for t
h
e S
E
C/DI
V and time-
mar
k generator setting
combinations s
h ow n in Tab le 5-7
und er t h e " N ormal"
column .