Tektronix 2235 - Settings for Delay Time Accuracy Checks; Check Delay J Itter

A dju
stme
n
t
Pr
oce d ur e-2235 Service
g . Align t h e start of t h
e Α Swee p wit h t h e 1 st vertical

ρ . Set :
graticule line using t he H
orizontal P OSITIO N cont r
ol
.
h .
C HE C K -I n tensifie
d p ortion of t h e trace starts wit
h in
1 .1 divisio ns of t he sta r t of t h
e swee p .
5- 1 8
i . R epeat p
arts d and e .
j . Set
:
C h a nn el 1
AC-G N D-DC

DC
H O R IZO N TA L
M OD E

Β
ΑSE C/DI V
0 .5 μ s
ΒS E C/DI V
0 .05 μ s
ΒD EL AY
TIME P OSITIO N 1 .00
k . Select
0 .5-ps time mar k e r s from t h
e time-mar k
ge n erator .
Ι .
Ad j ust t h e H orizo n tal P OSITIO N
control so t h at t h e
to p of t h
e
first
fully dis p layed time mar k er
is aligned wit h t h e
center vertical
graticule li n e .
m . W it h
o u t chan gi n g t he H orizontal P OSITIO N
control
setting, set
t
h
e Β D ELAY TIME P OSITIO N
d ial to 9 .00 .
Slig h tly read ju st t h
e Β D EL AYTIME P OSITIO N
dial to alig n
t h e to p of t h e time
mar k er wit h t he center
vertical gratic u le
line .
η .
C
HE
CK -T he Β D EL AY TIME P OSITIO
N dial setti n g
is b etwee n
8 .905 and 9 .095 .
ο . R epeat p
arts
Ι
t h roug h η fo r t he remaining
Α and Β

12 .
Check Delay J itte r
S E C/DI V
and time-mar k gen erato r setting com
b inatio n s
sh ow n i n
Table 5-7 .

α . Set :
Table 5-7
Setti n gs fo r Delay Time
Accu
r
acy Ch ec ks
0 .5 ps

0 .05 μ s

0 .5 us
5 ps

0 .5 us

5 μ s
0 .5
ms

50 μ s

0 .5 ms
5
ms

0 .5 ms

5 ms
0 .5 s

50 ms

0 .5 s
ΑSE
C/DI V 5
μs
Β
SE C/DI V 0
.5 μ s
ΒD EL
AYTIME P OSITIO N 1 .00
q .
Select 5- μ s time mar k ers
from t he time-mark
generator .
r . Ad j ust t he H orizontal P
OSITIO N co n trol so t h
at t
h
e
rising
e d ge of t h e displayed time
mar k er is alig n ed wit h t h
e
cen ter
vertical graticule line .
s .
W
it hout chan ging t he H
o
r
izontal P OSITIO N control
setting,
turn t he ΒD EL AY
TIME
P
OSITIO N dial cloc k
wise
to p osition
t h e n ext time ma rk er
leading edge to t h e cen
ter
ve r tical
gratic u le li n e .
t . C HE CK -T he ΒD EL AY
TIME P OSITIO N dial setti ng
is 0 .975 to 1 .025 greater t h
a
n
t he p revious setti n g .
υ . Set t he ΒD ELAY
TIME
P
OSITIO N dial to t h e
exact
intege r setting .
ν .
R ep eat p arts r t h roug h
υ for eac h successive time
mar k er
up to t he mar k er co r res p
ondi n g to t h eΒ D ELAY
TIME
P
OSITIO N d ial setting of
10 .00 .
Α
S
E
C/DI V 0
.5 ms
Β S E
C/DI
V
0 .5
μ s
Β D EL AY
TIME P OSITIO N 10
.00
b . Select 50- Ει s time mar k ers f r
om t he time-mar k
Α
S EC/DI V

ΒS E C/DI V
Time- M a rk

generator .
Switc h
Setti ng

Switc h Setti n g

Ge ne r ato r Setti ng
c . R
otate t he Β D ELAY
TIME
P
OSITIO Nd ial co u nte r -
cloc kwise to p
osition α time mar k er wit h in t h
e gratic u le a r ea
for eac h
ma j or dial d ivisio n and C HE C K t h at t h
e j itter on t he
leading
edge d oes n ot exceed 0 .5 d ivision
. Disregard slow
drift .
d . Disconnect
t he test eq ui p ment from t h
e
i n
st r ument .