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Models 461A/462A
Se.tion V
Paragraphs 5-18
to
5-23
f.
Connect 50 ohm load and Oscinoscope
(dc
coupled)
to
OUTPUT of
Model462A.
s.
?ulse
droop should not exceed
1070.
5-I8.
PANEL REA.lOVAI AND
REPLACEMENT,
5-19. The Model
461,4
includes
top,
bottom
and
two
side
panels. For
maintenance
and
calibmtion,
only
top
or
bottom covers need
be removed.
Srde
panel remoral
will
be
necessary only
when
replacilg
front
or rearpanel etc.
Panel
remo€l
is illusirated
in
Figlre
5-?.
a.
Remove
ac power
from
the Model
461,4.
b.
Remove
ihe 6/32 screws thai
hold
the
panel
in
c.
Remove
the panel.
d.
when replacilg
the
panel, simply reverse
the
5-2O.
CALISRATION
PROCEDURE.
5-21. Thefollowirg is
a complete
test
and
adjustment
procedure
and
should
be made
only
if it
has been
de-
termined that the
-hp-
Model 4614
is
out
ol adjust-
ment
as
determined
by Panaraph
5-5,
Performance
Check. lndiscrlminate
adjustment
of the lnternal
controls
to "refine"
seitirgs
may
actually
cause
diJ-
ficulty.
Calibration
procedures
for
the Models
461A
and4o2Aareprovided.
Theheading
of
each
paragraph
indicates whether the procedure ls applicable
to
one
or
both
instnments,
5-22.
IqIlEiqlllf
.{191434
1q?4)
a.
Removetopand bottom
coverstrom Model4614
cabinet (reter
b
lisure
5-?).
b.
Connect
Model
461A to
a
Var lable
Transform€r.
Set
line
voltage
to
115
volts.
c.
connect common lead
of Dc Vonmeter
Ghp-
Moder
412A)
to -hp-
Model 4614
chassis
groud
and
01358-2
VOLTS probe
toterminar
+6
of
Transformer T1
(red
wire).
Reter to
Fisue
5-11.
d
Tn€
Dc voltmeter
shotrld
indicate
+15 +2
votts.
e.
Vary
input
line
voltage
with
var iable
transformer
from
103
to
127
volts.
DC
Voltmeter reading shodd
not
change
by more
ihan
0.5 volts from the reading
observed
in
step
d.
L
Conneci
VOLTSprobe
ofDC
Voltmeter
to
emitter
of
Ql
(yeuow
wire).
g.
DCVoltmeter
shoxld
indicate -15
volts
+2
volts
h.
Vary
input
lrnevoltagewlthlariable transformer
from
103
to
12?
volts.
DC
Voltmeter reading
should
not ctange by more
than 0.
5
volts from the
reading
obsened in
step
g.
i.
Measure
ihe
ac vonase
Ghp-
Moder
400L) be-
tween
emitter of Ql
and
ground;
ripple
voltag€ must
be
less
than
1
mv
for
rated line
voltage.
j.
Measure
ihe ac
voltage
between
terminal {6
of Tlanslormer T1
and
eround;
lippte
voltage must
be
less ttlan
I
mv
for ary
Iated line
voltage.
5-23.
GAIN
CALIBRATION
(46rA
ad
462A).
a.
Connect
the 461,{
as
shown
in
Figue
5-1.
b.
Set
tlle oscillatorfrequency to
500
KHz
with its
amplitude at
minimum.
c.
Set
the
attenuatorto
50
dband connect the
volt-
meter
to
position
A.
d.
Adjust
the
oscillatd
amplitudefor
a
voltmeter
indication of -50
db.
e.
s€t
the
4614 GAIN
(DB)
control
to
40 db
and
comect ihe voltmeter to position
B.
The volimeier
should
read
-10
db
+0.5
db. Il
not,
change
ihe
value
of
A3RlSuntil
the
voltmeter
does
itrdicate
-
10
db
i0-
5
db.
The
\alue ol
A3R18
is typically
4.
?
A
b
10
A.
@uooer
zrza
oscrLLoscoPE
@vooer
rzsa
@vooer
aer
n
WIOE BAND AMPLIFIER
POStrroN "B"
f1r
olea
''/
o
o
oo
,,'-..
{(
)r
o
Figure
5-6.
Pulse Overload Recovery
Check
setup
5-5
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