B Asic O P Eration; General Operating Information - Tektronix 7A16A Instruction Manual

O
p
eration-7Α16Α
B
ASIC O PER ATIO N
T
he TEK TRO N IX Ρ6053
p
ro be is equi pp ed with α
rea
d
out co
d
ing ring whic h connects to α circ uit in t h e
General . Th is procedure
d
emonstrates the use of the am
p
lifier unit . This automatically corrects t he rea
d
out
co nn ectors and controls of the 7Α16 Α, wh ile at the same
d is played on the C R T to the actual d eflection factor at the
time provi
d
ing α mean s of ch ecking the basic operation of ti p of the p ro be . Th is p ro b e is recommen de
d
for use with
t
he instrument .
th e 7Α 16 Α an
d
an oscilloscope e
q
ui
p
pe
d
with readout . The
TEK T RO
N
IX Ρ 6054 p robe is electrically identical to the
Ρ 6053 b ut is inten
d
e
d
for use with systems not e
q
u i pped
Preliminary Setup . I n stall t he 7 Α 16 Α into any 7000- with rea
d
out. For more information refer to the Te ktronix,
series oscilloscope vertical compartment an
d
set t h e oscillo- Inc. catalog .
sco
p
e VERTICA L M OD E an
d
T
R IGG ER SO UR C E to the
p ro
p
er setti ngs .
Install α 7-series time-base unit into α
h
orizontal Vertical Gain Chec k and A
d
justment
com
p
artment an
d
set the oscillosco pe HO R IZON TA L
To ch ec k
t
he gai n of the 7Α16 Α, set the VO LTS/DIV
M OD E to the
p
ro
p
er setting. Set the time-base unit to α
s
w
itch to 10 m V
a
nd connect α 40 m V, 1 kH z signal from
sweep rate of one-milliseco n
d
per division an
d
set the
the oscillosco p e calibrator to t he In p ut connector . The
triggeri ng mode to A UTO .
vertical d eflection s h ould b e exactly four d ivisions . If not,
a
d
ju st the front panel GAI
N
for exactly four d
ivisions .
Proced u re
1 . Set the 7Α16 Α AC-G N D-DC switch to G N D and
p
ositio n
t
h e trace to th e ce nter of the graticule.
2. Set the VO LTS/DIV switch to 10 m V an
d
apply α
40 mV 1 kH z square-wave signal from th e oscilloscope
CA L I BR ATO R to the 7Α 16 Α I NPUT connector. Set the
AC-G N D-DC switch to DC an
d c
h eck for α four-
d
ivisio n
display.
3 . Set
P
O LA R ITY switch to I NVER T a n
d
chec k
t
hat
the dis
p
laye d signal is inverted as compared to its ap pear-
ance in step 2 .
4 . Set the AC-G N D-DC switch to AC and chec k
t
hat
the trace is centere
d
on the C RT graticule.
5 . Set the oscillosco
p
e CA L I BR ATOR to 4 mV an d
t
he
7Α16 Α MAG switch set to ιΧ 10 . Chec k for α four-
d
ivision
d
is play.
6.
P
ress the 7Α16 Α ID EN TI FY bu tton, chec k
t
hat the
d
is play moves u
p
ward app roximately 0.3 division an
d
t
he
rea
d
out (if so equ ip
p
e
d
) rea
d
s "ID EN TI FY" .
G
EN E RA L
O
PERATING I NF O RM ATIO N
Signal Connections
In
p
ut Coupling
T
he AC-G N D-DC switch allows α ch oice of in
p
ut
cou
p
ling methods. T he ty
p
e of
d
isp lay
d
esired and
t
he
app lie d signal will determine t h e coupli ng to use .
The DC co upling
p
osition ca n be use
d
for most
ap
p
lications. For AC signals with
f
requencies
b
elow about
30
H z (10 H
z with α 10 Χ
p
robe), an d
s
quare waves whose
low-frequency com
p
onents are im portant to the display, it
is necessary to use DC coupling to obtain α satisfactory
p
resentation .
In the AC cou pli ng
p
ositio n
t
he DC component of th e
signal is
b
locke
d
b
y α ca pacitor in the in pu t circ uit . The AC
cou pling position
p
rovides the best display of signals with α
DC component much larger th an the AC com
p
onent. Th e
p
re-c h arge feature shoul
d
be use
d
when there is α
p
ossi bility
of
h
aving α resi
d
ual charge on t he in
p
ut ca
p
acitor of th e
op
p
osite polarity to t h e inte nd ed
i
n
p
ut, and wh en th e
algebraic sum of the com bi nation of ch arges may b e greater
than the maximum in
p
ut limitations of the am plifier . To
use th is feature, first set the coupling switch to G N D, t h en
connect the probe to th e circ uit an
d
wait about two
seco n
d
s for the co up ling ca pacitor to charge, set the
cou pling switch to AC .
In general,
p
robes offer the most co n venient mea ns of
Th e G ND
p
osition
p
rovi d es α ground reference at the
co nnecting α signal to the in
p
ut of the 7Α 16 Α. Α 10 Χ
inpu t of th e am plifier without externally grou nding the
attenuator probe offers α
h
ig h im pe
d
ance and allows the
In
p
ut connectors . However, the signals connecte
d
to the
circ uit under test to
p
erform very close to normal o
p
erating in pu ts are not gro un
d
ed, and t he same DC loa
d
is
p
resente
d
con
d
itions . to the signal source .