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5. 6
Procedure
(1)
Firstly,
set
up
the
120MHz
Loop
as follows:-
(2)
Using the multimeter
set to
a
d.c. voltage
range, monitor
link
LKl
on p.c.b. 19-0849
(Fig. 18).
Verify a reading
(to
chassis)
of
-2.0V
± 0.2V.
If
necessary
adjust the
core of inductor L2
to
obtain
this
reading.
(3)
Disconnect
the
multimeter
.
(4)
Note
the
frequency reading on
the display.
Set the rear
panel
STANDARD
switch
to
EXTERNAL
and check
that the
frequency
display extinguishes.
(5)
Connect
a
1MHz
external standard
to
the external
standard input
socket,-
the
1MHz
output from
a
counter
is
suitable^and
check
that
the display
is
restored
and
the
frequency reading
has
not
changed.
(6)
Set the
STANDARD
switch
to
INTERNAL.
(7)
Set the
TUNE
switch
to
FAST,
SLOW
and
HOLD
in
turn
and
verify
that
the resolution
on
the
display
is
Fast:
100kHz
Slow:
1kHz
Hold:
10Hz
(8)
Set the
modulation
selector switches
and
the
FINE
TUNE
selector
switches
to
OFF.
Check
that the
OUTPUT
switch
is
at
NORMAL.
(9)
Set the
TUNE
switch
to
FAST
and
CHANNEL
SPACING
kHz
to
'5'
.
(10)
Starting
with
the
256-512
range,
set the
RANGE MHz
switch
to
each
range
in
turn
and, by operating
the
TUNE
spin
wheel and
observing
the display, verify that
the
frequency coverages,
in
Table 7 are
obtained
.
9081
&
9082 Vol.2.
5-6
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