Tektronix 2213A Operator's Manual

G R ATIC ULE
The graticule is i n te rn ally mar ke d on t
h
e face p late of
t h
e
crt to enable accu r ate measu r eme n ts
wit h
out parallax
error
(see F ig ur e 3-1) . It is ma rk ed wit h eig h t vertical and ten
h ori-
zon tal ma j or d ivisio ns . Each ma j or division is d ivi d ed into
five sub d ivisions . T h e vertical d eflection facto r s and h
orizon-
tal timing are calibrate d to t
h
eg
r
aticule so
t h at acc ur ate
measurements ca
n
be made d
i r
ectly
f r
om
t h
e c
r t . Also, per-
ce n tage
mar k
e
r
s fo
r
t
h
e meas ur eme
n t of rise and fall times
are located on t h e left si d e of t
h
e g
r
aticule .
G
R
O UN
DI N G
T he most r elia b le sig n al measu
r
eme
n
ts are
made w hen
t h e 2213
Α
and
t h
e u
n it
u nde
r test are con n ecte db y α com-
mon
r
efe
r
e
n
ce (gro und lead),
i n
a
dd itio n to t he sig n al lea d or
probe . T he pro b e's ground lea d provides t he best grounding
met h od for signal interconnectio n an d ensures t h e maxi-
mum amount of signal-lead sh ieldi ng i n t he p ro b e ca b le .
Α sepa r ate ground lead ca n also be connecte d from t he unit
under test to t h e oscillosco pe G N D con nector locate d on
t he fro n t p anel .
SIG N A L CO NNE CTIO N S
Ge n erally, p robes offer t he most convenient mea
n
s of
connecting an in p ut signal to t he instrume
n t . T h
ey
a r e
sh iel d ed to p revent pic ku p of electromagnetic interfe r ence,
and t h e sup plie d 10 Χ probe offers α h ig h i np ut impe d ance
t h at minimizes circ u it loading . T h is allows t he circuit u
n
der
test to operate wit h α minimum of c h a n ge f r om its
n
ormal
cond ition as measurements are bei
ng
ma
d e .
Coaxial cables may also be
u se d to con n ect sig n als to
t h e in p ut con nectors, but t hey may h ave co n siderable effect
on
t h
e acc
u racy of α displayed waveform .
To
maintain t h e
original
fre
q uency c
h aracteristics
of an
a pp lied signal,
only
h ig h - q uality,
low-loss
coaxial cables sh ould b e u sed .
Coaxial cables
sh ould be terminated at both ends i n t h eir
c
h
aracte
r istic im p ed ance . If t h is is n ot p ossi b le, use suitable
impedance-matc h ing devices .
I NPU T CO UPL I N G
CA P ACITO R PRE C H A R GI N G
Wh en t he
In p
ut
Cou p ling switc h is set to G N D, t he in p ut
signal is co
n nected to grou nd t hr oug h t he in p ut co u pling
cap acitor
in series wit h α 1 ΜΩ r esisto r to fo r m α
p rec ha r gi n g network .
T h
is
n
etwo
rk
allows
t h
e
in p
ut coupling
capacitor to charge to t
h
e average dc-voltage
level of t h e
signal applied to t
h
e probe .
T h
us any large
voltage
tra n sie n ts t h at may accide n tally be generated will not b e
ap p lie d to t h e am p lifier in pu t w h en t h e I np ut Cou p ling switc h
is moved
from G N D to AC . T h e prec h arging n etwor k also
p rovides α measure of p rotectio n to t he exte r nal ci r cuitry by
red u
cing t h e cu r rent levels t h at can b e d raw n fr om t he ex-
ternal
circuitry during cap acitor ch arging .
T h e followi ng p r ocedure s h oul d be used w h enever t he
pro be ti p is connected to α signal source h
aving
α
different
do level t han t h at previously a pp lied, esp
ecially if
t
h
e dc-

Tektronix 2213A Specifications

General

Brand	Tektronix
Model	2213A
Category	Test Equipment
Language	English