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Program
a
frequency
of
200
Hz
and
adjust
R51
to
obtain a
total
cycle
length
of 5.
000
msec.
10,
Program
a
frequency
of
400
Hz
and
adjust
R55
to
obtain
a
total
cycle
length
of
2.
500
msec.
Program
a
frequency
of
800
Hz
and
adjust
R59
to
obtain a
total
cycle
length
of
1.250
msec.
12.
Check
the
frequency decade
calibration
by
programming
and
measur-
ing
various frequencies
within one range.
SINE
CONVERTER BOARD
(Board No. 017-103-61)
1.
Set
R30,
R18
and
R6
to
the
center
of their rotation.
2.
Set
R25
fully
CCW,
R17
fully
CW
and
R5
fully
CW.
3.
Set
frequency
to
9.
99
and
XI
00;
see
Figure 5-3
for
waveform
with
oscilloscope on alternate
sweep
and
external trigger.
7
4.
Adjust
R25
until
a
^urb
lq/hear
the
axis
crossing appears.
Center
the
burble
at the
axis
crossing with
R30
(A,
Figure
5-3).
5.
Adjust
R17
and
R18
until
waveform
is
as
illustrated
in
A,
Figure
5-4.
6.
Adjust
R5
and
R6
xintil
distortion
analyzer
null starts to flatten (See
B,
Figure
5-4).
7.
Adjust
R5
and
R6
to
smooth
peaks.
8.
If
above
steps
were
done
correctly,
the
distortion
should be
less
than 1%.
9.
Tune
distortion
analyzer
for
best
null and,
finally,
tune
each
potenti-
ometer
for
minimum
distortion.
OUTPUT
AMPLIFIER
BOARD
(Board No. 017-119-61)
NOTE
In
preparation
for the
adjustments on
the
output amplifier board,
the
following
ad-
justments
must
be
made
on
the
Schmitt &
Switch
Board
(017-104-63).
5-3
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