Tektronix 2235 - Attenuator Compensation Ad Ju Stments; Adjust Attenuator Compensatio N

Ad j ust m en t Pr oce dur e-2235 Service
b . Set t he cali b ratio n generator to
produce α 20-m V

Ta b le 5-4
signal .

Atte n uato r Com p ensatio
n A dju stme n ts
c . Set t h e b ottom
of t h e signal on t h e center h orizontal
gratic u le line u sing t he
C h annel 2 P OSITIO N cont r ol .
d . Set t h e C h annel 2 AC-G
N D-DC switc h to AC .
e . C HE C K -Dis p lay is ce
n
tere
d ab out t he center h ori-
zontal graticule li ne .
f . M ove t he cable from t
h
e C
H 2
O
RΥ i np ut connector to
t he CH
1
O
RΧ in p
ut
connector . Set t he VER TICA L M OD E
switc h to C
H 1 .
g . R epeat p arts c t h ro u g
h
e
using t he C han nel 1 controls .
α . Set both AC-G N D-DC switc hes to
DC
.
b .
Connect t he h ig h -am p litude s q uare wave outp
u t via α
50-
Ω termination, α p ro b e-ti p -to- BN Ca d apter, an
d t he 10 Χ
probe to t h e C H 1 OR Χ in p u t co
n
nector .
c .
Set t h e gene r ator to produce α 1-
kH z, 5-divisio n
dis-
play
and com p e n sate t he pr obe using t
h
e p
ro b e com p ensa-
tion ad ju stment (see t he p robe instruction
man u al) .
d . Set t he C H 1 V O L TS/DI V switc h to 0 .1
V .
e . R eplace t h e prob ea nd probe-ti
p
-to-
BN
C
adap ter wit h
α 50- Ω cab le .
f . Set t he gen erator to p ro d uce α 5- d
ivision display .
ΝΟΤΕ
A dj ustme n t

Ι

C h a
nn
el
1

1

C ha nn el 2
10 Χ LF Comp

C12

C62
10 Χ In p ut C

C11

C61
100 Χ LF Com p C5

C55
100 Χ I npu t C

C4

C54
h . R eplace t he 50- Ω ca b le a nd 50- Ω termi
n
ation
wit h t he
p ro be and p ro b e-tip-to- BN C adapter .
i . Set t h e ge n erator to p roduce α 5- d
ivision
dis p
lay .
j . AD
JU
ST-T he 10 Χ In p ut C ca p acitor for best flat top .
h . Discon nect t h e test eq u i p ment from t
h
e
instrume n t .
k . R epeat p arts e t h roug h j un til no f ur t h er
improveme n t
9 .
A d ju st Atten u ato r Com p ensatio n (C12, C11, C5,

is
n oted .
C4, C62, C61,C55, an d C54)
Ι . Set t h e C H 1 V O
L TS/DI V switc h to 1 V .
m . R ep lace t he p ro be an
d p robe-ti p -to- BN C ada p ter wit
h
t he 50- Ω ca b le an
d 50- Ω termination .
η . Set t he gen erator to p
roduce α 5-division d is p lay .
ο . AD JU ST-T
h
e
100 Χ LF Com p capacitor for b est fro n t
corn er .
ρ . R eplace t he 50-
Ω cab le and 50- Ω terminatio n wit h t h e
pro b e and p ro b e-tip-to-
BN C ada p ter .
q . Set t h e gen erator to pr oduce
α 5-division d isplay .
r . AD JU ST-T
h
e 100
Χ I np ut C cap acito r fo r b est flat
top .
U se Table 5-4 to identify t h e co r rect capacitor
for
eac h ch a nn el ad j ustme n t .

s . R ep eat p arts
m t hrough r u ntil no furt h er im p rovement
is note d .
g . AD JU ST-T he 10 Χ LF Com
p
capacitor
for b est front
cor n er .

t . Set t he VER
TICA L M OD E switc h to C H2 .