Table of Contents
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Introduction
T
h
e outp
u
t of t
h
e Signal Splitter Am p lifier is co
nn
ecte
d
to t
h
e oscilloscope mai
n
frame via t
h
e interface connector .
T
h
is section of t
h
e manual contains α
d
escri
p
tion of t
h
e
circuitry
u
se d in t
h
e 7 Α 16 Α am p lifier . T
h
e 7A1 6A
d
escri p-
tion begins wit
h
α d iscussion of t
h
e instr
u
me
n
t usi
n
g t
h
e
b
loc
k
diagram s
h
ow
n
in t
h
e Diagrams section . T
h
e
n
, eac
h
circuit is d escribed in
d
etail using b loc
k d
iagrams to s
h
ow
t
h
e interconnections
b
etween stages in eac
h
ma
j
or circuit
a
n
d
t
h
e relations
h
ip of t
h
e front- p anel controls to t
h
e
in d ivi d ual stages .
Com
p
lete sc
h
ematics of eac
h
circ
u
it a
r
e give
n
in t
h
e
Diagrams section .
R
efer to t
h
ese sc
h
ematics t
h
roug
h
out t
h
e
following
circ
u
it
d
esc
r
iptio
n
for
electrical val
u
es a
nd
relations
h
ip .
BL
OC
K
DIAG
R
A
M
Th
e signal to
b
e d isp laye d on t
h
e C
R
T is ap
p
lie d to t
h
e
I
NPU
T connector . T
h
e sig
n
al
p
asses t
h
ro
u
g
h
t
h
e in
p
ut
cou p ling switc
h
, w
h
ere t
h
e a
p
p ro p riate cou p ling is selecte d ,
to t
h
e attenuators . T
h
e V O
L
TS/DI
V
switc
h
selects t
h
e
correct amount of atten
u
ation and t
h
e signal is p asse d to
t
h
e In
pu
t Source
F
ollower .
T
h
e
P
olarity Amplifier provides α conve
n
ient mea
n
s of
inverting t
h
e
d
is p laye d trace . T
h
e out put of t
h
e
P
olarity
Amplifier
d
rives t
h
e 2 Χ Gain Am
p
lifier :
CI R C U IT D E SC R I PTIO N
R
eadout enco d ing
circuitry
u
se
d
i
n
t
h
e 7 Α 16 Α is
standard to t
h
e 7000-Series .
D
E
TAI
LE
D CI
R
C
U
IT D
E
SC
R
I
P
TIO
N
AC-G
N
D-DC Switc
h
In p ut signals connecte d to t
h
e I
NPU
T connector can
b
e
AC-co
u
ple
d
,
DC-couple d ,
or
i
n
ternally
d isconnected .
S100A
is α cam-ty pe
switc
h
; α contact-clos
u
re c
h
a
r
t
s
h
owing t
h
e operatio
n
is given on t
h
e sc
h
e
m
atic
d
iagrams .
Wh
en t
h
e AC-G
N
D-DC switc
h
is i
n
t
h
e DC
p
ositio
n
, t
h
e
I
NPU
T signal is connecte
d d
irectly to t
h
e atten
u
ators . In
t
h
e AC
p
osition, t
h
e I
NPU
T signal
p
asses t
h
ro
u
g
h
ca
p
acito
r
C10 . T
h
e ca
p
acitor
p
revents t
h
e DC component of t
h
e
signal from passing to t
h
e am p lifier . T
h
e G
N
D
p
ositio
n
o
pens t
h
e signal
p
at
h
and con
n
ects t
h
e inp
u
t circ
u
it of t
h
e
amplifier to gro
u
nd . T
h
is
p
rovi des α gro
u
n d reference
wit
h
out t
h
e nee d to discon
n
ect t
h
e a pplie d signal from t
h
e
I
NPU
T connector .
R
esistor
R
102, co
nn
ected across t
h
e
AC-G
N
D-DC switc
h
, allows C10 to
b
e
p
re-c
h
arged in t
h
e
G
N
D
p
ositio
n
.
Inp
u
t Attenuator
Section 3-7 Α 16 Α
W
it
h
t
h
e V O
L
TS/DI
V
switc
h
set to t
h
e 5 m
V
an d
T
h
e effective overall
d
eflection facto
r
of t
h
e 7 Α 16 Α is
10 m
V p
ositio
n
s, t
h
e signal connecte d to t
h
e
I N
PU
T
d ete
r
mi
n
e
d b
y t
h
e setting of t
h
e V O
L
TS/DI
V
switc
h
,
connector is
p
asse
d
t
h
roug
h
t
h
e attenuators υη -attende d .
S100
B
. T
h
e
b
asic deflection factor is 5 millivolts
p
er
To ac
h
ieve α deflection factor of 5 m
V
/Div t
h
e gain of t
h
e
d
ivision of C
R
T d eflection . To increase t
h
e
b
asic
d
eflection
2 Χ Gai
n
Am p lifier is increase d from one to two . Inter
n
al
factor to t
h
e val
u
es i
nd
icated on t
h
e front panel,
p
recisio
n
gain an d
b
ala
n
ce a d
ju
stments are incl
u
ded in t
h
e am
p
lifier .
attenuators are switc
h
e
d
into t
h
e circuit . S100
B
is α
ca
m
-type switc
h
and t
h
e dots on t
h
e contact-closure c
h
art
(see Diagram 1) in d icate w
h
e
n
t
h
e associate d contacts are in
Overall GAI
N
an d V A
R
IA
BLE
gain is a
dj
usted in t
h
e
t
h
e positio
n
s
h
own (o
p
e
n
or close
d
) . In t
h
e 5 m
V
/Div and
Gain
Amplifier .
V aria
b
le
B
alance and
h
ig
h
f
r
e
q
ue
n
cy
10 m
V
/Div
p
ositions, t
h
e atten
u
ators are
n
ot use d ; t
h
e
a
dj
ustme
n
ts a
r
e also controlled in t
h
e Gain Am
p
lifier . T
h
e
in
pu
t sig
n
al is co
nn
ecte d d irectly to t
h
e Sou
r
ce
F
ollower .
out
p
ut of t
h
e Gain Amplifier is connected to t
h
e
P
osi-
T
h
e 10 m
V
/Div positio
n d
ecreases t
h
e gain of t
h
e 2 Χ Gain
tioni
n
g circ
u
itry w
h
ere t
h
e
P
OSITIO
N
an d ID
EN
TI
F
Y
Amplifier .
F
or switc
h
positions above ten millivolts
p
er
f
u
nctions are controlle
d
.
d
ivision, t
h
e atten
u
ators are switc
h
e d into t
h
e circ
u
it singly
o
r
i
n
pairs to
p
ro d uce t
h
e d eflection factor in d icate d on t
h
e
front
panel .
T
h
ese
h
ybri d
atte
n
uators
are fre
qu
ency
T
h
e Signal Splitter Am
p
lifier provi
d
es
d
ifferential sig
n
al
com
p
e
n
sate
d
voltage d ividers .
F
or DC and low-frequency
o
u
t
p
uts fo
r
t
h
e signal line and t
h
e trigger line . T
h
is stage
sig
n
als, t
h
e attenuators are
p
ri
m
arily
r
esista
n
ce
d
ivi d ers an
d
contains α
b
andwi
d
t
h
limiter t
h
at limits t
h
e
upp
er fre
qu
e
n
-
at
h
ig
h
f
r
e
q
uencies t
h
e atten
u
ator
b
ecomes
p
rimarily α
cy res p onse to 20
MH
z .
ca
p
acitive divi
d
er .
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