Tektronix 2235 User Manual

A dju stme n t Pr oced ur e-2235
Service
2 . C h ec k H ig h - V oltage S up p ly

c . Set t he generator to p ro d
uce α 50- kH z, 4-division
display .
W A RN I NG
Instrume n t must be tur n ed off w hen removing
o
r
re-
placing t h e crt cover and ca p .
b . C HE C K - V oltmeter readi n g is b etwee n
-1900
V
and
-2100 V .
3 . Ad j ust C RT Grid Bias ( R 851)
b . Ad j ust t h e front-panel F OC US control to p
roduce α
well-
d efined dot .
c . R otate t he Α I NT EN SITY con trol fully
counter cloc kwise .
e . Disconnect the 50- Ω termination
from the ΕΧΤ Ζ AXIS
INPUT connector .
4 . Adjust Astigmatism
(R874)
α . Set :
Α INTENSITY

V
isible display
CH 1 V OLTS/DIV

5 mV
C hannel 1 AC-GND-DC

DC
Α
S E C/DI V 5
μs
d . AD JU ST-Astig ( R 874) and t he front-panel
F OC U S
control for t h e b est defi ned
wavefo
r m .
e . Disconnect t he test equi p ment from
t
h
e instrume n t .
α . R emove t he crt cover and ca p
and co
nn
ect α do volt-

5 . Ad j ust T r ace Alig n ment
mete r cap able of measuring at least
-2500
V
b etween pi n

α . P osition t h e trace
to
t h
e ce
n
ter h orizo n tal graticule
2 of t he crt sock et and ch assis ground . P i n 2
of
t h
e crt is

line .
negative wit h res p ect to t he ch assis .
b . AD JU ST-T h e fro n t- p
anel
TR AC
E R OTATIO N co n -
trol for o p timum alignment of t he
trace
wit h
t he cente r h ori-
zon tal graticule li n e .
c . Disconnect t h e voltmeter leads a nd re p lace t h
e
crt
cap

6 . Ad ju st Geometry ( R 870)
and cover .

α . Set :
C H 1 V O L TS/DI V 50 m V
ΑS E C/DI V 0 .1 ms
α . Connect α 50- Ω termination to t h e ΕΧΤ Ζ AXIS I NPU T
connector
locate d on t he rear p anel .

b . Connect
50- Ει s time mar k ers fr om t he time-mark gen-
erator via α 50- Ω cable
an d α 50- Ω terminatio n to t h e C H 1
ORΧ in p ut connector
.
c . Ad j ust t he C h annel 1 P OSITIO N
cont
r
ol to p osition t he
b aseline p art of t he display below t h
e bottom h o r izontal
graticule line .
d . Ad j ust t h
e S
E
C/DI
V V
aria b le control for 5 mar k e r s pe r
d i visio n .
d . ADJUST-Grid B ias (R851) for
α visible dot . Then
b
ack
off the Gri d B ias p otentiometer until the dot just
disappears .

e . ADJUST-Geom (R870) for minimum
curvature of the
time markers at the left and right
edges of the graticule .
f . Set the Channel 1
AC-GND-DC switch to GND .
g . ADJUST-Geom (R870) for minimum curvature
of the
b aseline trace when positioned at the top and b ottom hori-
zontal graticule lines using the Channel 1 P OSITION
control .
h . Set the Channel 1 AC-GND-DC switch to DC .
i . R ep
eat parts e t
h
roug h h fo r op tim u m comp r omise be-
b . Co n nect 50-As time
mar k ers fr om t he time-mar k gen-

tween t he vertical
and
h
orizo n tal displays .
erator via α 50- Ω cable an
d α 50- Ω termi n ation to t he C H 1
O R Χ i np ut connector .

j .
Disconnect t h e test eq uipme n t f r
om t he instr u ment .

Tektronix 2235 Specifications

General

Brand	Tektronix
Model	2235
Category	Test Equipment
Language	English