Tektronix 2235 Operator's Manual

Pr epa r ation for U
se-2235 ΑΝ / US M -488 O p
e
r
ato r s
61

AC-Input sig n al is capacitively cou p led to t he ve r-
tical
amplifier . T he d o co mp onent of t h e inp u t sig-
nal is b loc k
ed .
L ow-f r
eque n cy limit (-3 d B point)
is
app roxi m
ately 10 H z .
4976-05
F ig u
re
2-4 . V
ertical co n t r ols, co n necto r s, and in d icators .
10 Χ PR O BE -In d
icates t h e d eflection factor selected
w hen u sing α 10 Χ pr obe .
VO L TS/DI V V aria b le
Co
n
trols-- Wh en rotate d cou n -
te r cloc k wise out
of t
h
ei r calibrate d d etent p ositio n s,
t h ese controls pr ovide
continuo u sly va r iable, u n cali-
b r ate d d eflection factors
between the cali b rated
settings of t h eV O L TS/DI V
switc hes .
UNCA L In d
icato
r
-T h e LE D ill uminates to indicate
t h at t h eV O L TS/
D I VV aria b le control is out of t he cali-
b r ated p ositio n .
13 Inpu
t Cou p l i ng (AC-G N D-DC) Switc h es-T hr ee-
p osition switc h es t h at select the met hod
of cou
pling
t h
e input signals to t he i n st r u m e n t d eflectio n system .
G
N D-T h
e inp u t of t he vertical amplifier is
gro unde d
to p
r
ovi de α zero (groun d ) reference-
voltage d is p lay ( d oes not ground t h e i np ut sig n al) .
This switc h
position allows pr ech a r gi n g t he i n p u t
cou pli n g capacito
r .
DC-All
f r eq uen cy components of t he i np ut sig n al
a r e cou p
le d to t
h
e vertical deflectio n systems .
CH 1 ORΧ
and C
H
2 O R Υ Inp u t Connectors-
Provide fo r app l i cation ο # external signals to the verti-
cal d eflection
system or for an Χ - Υ d is p lay . In t h eΧ - Υ
mo de (SE C/DI V
switc
h
set to Χ -Y), t he signal con-
nected to t he CH 1 O RΧ inp u t connecto r
provides
ho r izo n tal
deflection (X-axis) and t he sig n al connecte d
to t h e C H 2 O RΥ i np
ut co nn ecto r provides vertical
d eflectio n
(Y-axis) .
VER TICA L M
OD E Switches-Two t hr ee-position
switc hes are use d
to select t he mo de of op eration for
t he vertical
a
mp
lifier system .
CH 1-Selects
only
t h e
C
h annel 1 i
np ut sig n al for
d isplay .
BOTH-Selects b ot
h
C h annel 1 and C hann el 2 i n -
p ut signals for d isplay
.
T h
e C H 1-BOTH-CH 2
switc h m
ust be i n t he BOTH position for eit h e r
ADD, AL T, o r
CHOP operat i on .
CH 2-Selects
only t
h
e Cha nn el 2 inp u t signal for
d isplay .
AD D -Displays t he
algeb
r
aic sum of t h e C hann el 1
a nd C h annel 2 in p
ut signals .
P OSITIO N Co n
trols an d C hann el 2 I NVER T (P U LL)

ALT--Altern ately
d isplays C h annel 1 and C hann el
Switch -T h e
POSITION controls are used to verti-

2 in p u t signals . T he alte r
natio n occurs d uri ng re-
cally p osition t h e d is p
lay on t h e crt .

Wh en t h e

tr ace at t h
e e
n
d of eac h swee p . T h is mo d e is u seful
SE C/DI V switc h is
set to Χ -Y, the C h annel 2 POSI-

fo r viewing bot h in p
ut signals at swee p s pee ds
TI ON contro l
moves t he di splay vertically (Y-axis), and

f r om 0 .05 μ s p er d ivision to 0 .2
ms pe
r
division .
t h eHo r i z on tal P
OSITIO N cont r ol moves t h e d isplay

CHOP-The d isplay switc h es between
the C h an-
h o r i z ontally
(X-axis) .

n el 1

an d C h anne l 2 i np ut s i gn als d u ring the
To invert C h ann el 2
d isplay, pull o u t t he C h a n nel 2

sweep . T h
e switc h i n g rate is ap pr oxi m
ately
P OSITIO N control k nob . W it h t h
e C h a nn el 2 d isplay

500 kH z . Th is mo de is u sef u l fo r viewing
bot
h
i n ve r te d , t he instrument can
be op e r ate d as α d ifferen-

Chan n el 1 an
d C
h
annel 2 i np ut sig n als at sweep
tial amplifier w h
en
t h
e
V
ER TICA L MO D E switc hes a r e

s p
eeds from 0 .5 ms p e
r
d ivision to 0 .5 ,us p
e
r
in BOTH and ADD p
ositions-

d ivision .

Tektronix 2235 Specifications

General

Bandwidth	100 MHz
Channels	2
Vertical Sensitivity	2 mV/div to 5 V/div
Maximum Input Voltage	400 V (DC + AC peak)
Rise Time	3.5 ns
Vertical Resolution	8 bit
Input Impedance	1 MΩ || 20 pF
Power Requirements	90 to 250 V AC, 48 to 440 Hz
Trigger Modes	Auto, Normal, Single
Display	CRT
Weight	17 lb (7.7 kg)