Tektronix 2213A Operator's Manual

10 . Calculate t
h
e instantaneous voltage, usi
n g t h e fol-
lowing formula :
VO L TS/DI V
Instanta-

ve r tical

switc h setting
n eo u s

= d eflectio n χ

p olarity

χ

in d icated by 1 Χ
V oltage

(divisio n s)

(+
o r -)

(or 10 Χ wh e n 10 Χ
p ro b e is u sed)
E XAMPLE : T he measu r e d ve r tical deflection from t h e
refe r en ce line is 4 .6 d ivisio ns (see F igu r e 4-2), t h e wave-
fo r m poi n t is ab ove t he r efe r e nce li n e, α 10 Χ attenuator
p ro be is being use d , an d t he V O L TS/DI V switc h is set to
2V (at 10 Χ pro be setting) .
Su b stituting t
h
e give
n
values :
Insta n taneous V oltage = 4 .6 div χ (+1) χ 2 V /div =
9 .2 V .
Algeb r aic A dd itio n
W it h t he VER TICA L M OD E switc hes set to BOTH and
ADD, t he waveform d is p laye d is t he algebraic sum of t h e
sig n als applied to the C h
annel 1
and C
h
a
nn
el
2 in p
uts
(C H 1 +C H 2) . If t he C hann el 2 I NVER
T
butto
n
is pressed
in, t he wavefo rm d is p layed is t he d ifference b etwee
n
t
h
e
signals a pp lied to t he C hann el 1 and C
h annel
2 inputs (C
H 1
-C H 2) . Wh en bot h V O L TS/DI V switc hes are set to t
h
e
same deflectio n facto r , t h e deflectio n facto r i n t he ADD
mode is eq ual to
t h
e d
eflection
factor
i nd
icate
d b y eit h er
VO L
TS/DI V
switc
h .
T h
e
following
ge
n
e
r
al
p
reca
u tio ns sh ould b e observed
w hen using t he ADD mo de .
α . Do not excee d t he i npu t voltage rating of t he
oscilloscope .
b . Do not apply sig n als t h at exceed t
h
e e q uivalent of
ab out eig h t times t he V O LTS/DI V switc
h
settings, since
large voltages may distort t he display .
F
or exam
p
le,
wit h α
V O LTS/DI V switc h setti ng of 0 .5 V, t
h
e voltage a pp lied
to
t h at ch annel sh ould n ot exceed ap p roximately 4 volts .
c . U se C h annel 1 and C h annel
2 P
OSITIO
N control
settings w h ic h most nearly positio n t he sig n al on eac h ch
an-
nel to mi d scree n , w hen viewed
in eit h
e
r
CH
1 or C H 2
VER TICA L M OD E
.
T h is ensu res t
h
e greatest
dy n amic
range for ADD mode o p eration .
d . To attain
similar
res p onse
from
eac
h
ch
annel,
set
bot h t he C h annel 1 and Ch annel 2 I np ut Cou p ling switc h es
to
t h
e same p
osition .
Common- M o de R e j ectio n
T he following p rocedure sh ows h ow to eliminate un-
wanted ac input-power fre q uency com p onents . Similar
met h ods coul d b e used eit h e r to elimi n ate ot h er unwanted
fr eq uency components or to p r ovi deα do offset .
1 . P reset instrument controls and obtain α baseline
tr ace .
2 . Apply t he signal contai n ing t h e unwanted line-fre-
quen cy com p onents to t he C H 1 in pu t connector .
3 . Apply α line-fre q uency signal to t h e CH 2 in p ut con -
nector . To maximize cancellatio n , t he sig n al ap p lied to
C h ann el 2 must be in ph ase wit h t he u nwa n ted li n e-fre-
quency compone n t on t h e C hann el 1 i np ut .
4 . Select BOTH and A L
T
VER TICA L
M
OD E and set
b ot h V O L TS/DI V switc h es to produce displays of app roxi-
mately 4- or 5- d ivisio n s in am p litude .
5 . Ad ju st t h e C H 2 V O L TS/DI V switc
h
and C
H 2
V O LTS/DI VV ariable control so t h at t he C ha
n
nel 2 d isplay is
a pp
roximately t h
e same am
p
litude as
t he und esi r ed p ortion
of t
h
e C
h annel 1
dis p lay (see
F igure 4-3 Α ) .

Tektronix 2213A Specifications

General

Brand	Tektronix
Model	2213A
Category	Test Equipment
Language	English