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7
Sect.
tV
Pa€ie
2
(C
to
O)
the
ieft
hand
counter
goes
through during the
.ounting
.y.t".
Ten cornplete
cvcles
on
the
left
hand
"nunt",
ittOic"tu" correct operation with
a
10
SEC
gate
time.
I1
thc
above
illdications
ar.e
ol)tained
from the
instru-
ment
it
irdicates that the
majority oI
the
circuits
are
of.,o."tir,g
proputly.
U
lhe indication
for
a
pxrlicLrlsr
nr,"
trn,-"'t" al|"rys
K
I
llDos
the
(
oI'rect lndication'
i.,here
K
is
a la(
tor
such
rs
8.
'9
1
1'
1
2
ctc
'
or
r
oruiuct of
two
or
more o[ these
f]clors, il
indicates
if,'ri
.
pt"nt"",ton
trequency
divicler
(ircuit
is
out
of
adrustment. Reter
to paragraph 4-6 of
ftis
manual
for
philntastloll f,djuslmcnt
procedure (tcfer to
paragraph
a-tf
ot
tni"
manual
for
complete
trouble
shooting
procedure.
4.4
ADJUSTING
IHE
POWER
SUPPLY
Melasure
the
+200
\'olt
regulated supply
on
pins
3
and
6
oi V11?. Adjust
R1?4
(marked 200V), Iocated
on
the top
oI the
chassis, until the regulated
voltage
is exactly
200
volts as indicated
on
the most accurate
meter available.
4.5
ADJUSTING THE
AMPLITUDE DISCRIMINATOR
UNITS
a.
Set
the panel
controls
as
follows;
FUNCTION
SE
LECTOR
to
10 PERIOD AVERAGE
TIME
L,'NIT
selector to
MILLISECONDS
DISPLAY
TIME
( ont
rol to
miDimum
MANUAL GATE
switch
closed.
b.
Set
Rl1B and R119
(SENS
UNIT'S
1
and
2)
to
their
maximum clockw ise positions'
c.
Cor[I€ct a
1OO0
cycle voltage having
al
ampljtude
of .5 volts rms to
the input
terminal'
d.
Adjust
R2 (located on top
of
dlscriminator
2),
using a small screwdriver that wiU not short
the
shaftlo
ground, to the center ol the range that
produces an
indication
oi approximately
1
mil-Iisecond'
Watch
the
neon
indicator
on
the
parel to
be
sure
it
is
ilashing
on
and
oIf
when
making these adjustments'
e.
Reduce
t}le input voltage to approximately
'
15
.
volts rms
and
rotate
R119
(SENS
UNIT 2) coun-
terclockwise
until the instrument iust
begins
to
pro-
duce an
indication of approximately
1
millisecond'
i.
Repeat step
d.
wit-tr
the reduced input voltage
and
then
repeit
step
e'startingwithRl19
again
at
its
maximum clockwise
position
and
rotatlng
it
coun-
telclockwise.
Watch the
flashing
neon
indicator
to
rnake
"ur"
the instrument
is
operating properly'
g.
Reset
the panel controls
as
follows:
FUNCTION SELECTOR tO FREQUENCY
FREQUENCY UNIT
se
lector
set
for
a gate
time
of ,1
secords.
h.
Increase the amplitude oI the
1000
cycle
input
voltage
to 0.5
volt
rms.
i.
Adjust
r12
(Iocated on
top of discriminator
1),
using a
smal-I
screwdriver,
to the center
ol
the
range
thit
produces an
indication of approximately
1000
cycles.
i.
rleduce thg amplitude of the input voltage
to
0,
15
volts ims
and
rotate
i1118
(counterclock-
wise) until the instrument just
begins
to
indicate
approximately
1000 cYcIes.
k.
rlepeat step
i.
with the reduced input voltage
and
the.t repeat step
i.
stafting with
R118
ma-x-
imum clockwise
and
rotating
it
counte rc
lockwise
urtil
1000
cycles.
4.6
ADJUSTING THE PHANIASTRON
FRE9UENCY
DI{IDERS
Each
Dhantast
ron frequency
divider
must be
adjListed
to divlde bv
ten.
These
dividers must
be adjusted
in
the
order indicated
since t}te low
Irequency
dlvidels
obtain
their
input
from
the
higher frequency units'
Set
the controls
as
follows:
FUNCTION SELECTOR
to
CHECK
FRIQUENCY UNIT selector
as
indicated below
MANUAL GATE switch closed
DISPLAY
TIME control minimum
Set
the FREQUENCY UNIT switch Jor a
STD'
GATE
TIME
of
.
OO1
SEC.
and
adjust the
10
kc control
(R211), Iocated
on
top
oi the chassis, until
an
ildi-
cation'of
OOlOO
is
obtained. Indications of
00090,
00100, and 00110,
indicating division by
9,
10,
or
11,
may be obtained
witl
this control'
The
correct
seiting
ior
tire
control is
the
center of the range that
produces an
indication oI
00100'
Alt
adjustments
are available
on
top
of the chassis
and
arL
clearly marked.
Make
aII adjustments in the
order listed
below
following the
same
procedure out-
Lined
Ior
the 10-kc
Phantastron.
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