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9.
Set the
voltage
between
IC3(2),
and
IC3(3) to
0
Vdc
±100
/iV,
using
R
107.
See
Figure
4-4.
10.
Set the voltage
between
IC4(2),
and
IC4(3)
to
0
Vdc
±100
juV,
using
R
1
13.
11.
Set the voltage
between
IC5(2),
and
IC5(3) to
0
Vdc
±1
00
juV,
using
R123.
12.
Set the voltage
between
IC6(2),
and
IC6(3) to 0
Vdc
±100
/LiV,
using
R125.
13.
With
FREQ
DIAL
still
fully
clockwise,
set
the voltage
between
IC2(2)
and ground
(at
R95)
to
0
Vdc
±100
jLtV,
using
R93.
14.
Set
FREQ
DIAL
to
1
and
adjust voltage
between
TP6
and
TP7
to
0
Vdc ±200
/iV,
using
R129.
15.
Adjust
voltage
between
TPS
and
TP9
to
0
Vdc
±200
jLxV,
using
R132.
4.2.5 Triangle
Amplitude Adjustment
16.
Set
FREQ
HZ
to
X
100,
FREQ
DIAL
to 10,
WAVE-
FQRM
SELECTQR
to
TRIANGLE,
and
SYMMETRY
to
OFF.
17.
Connect
the
oscilloscope
probe
(a
type
W
or
1A5
plug-in
module
should be used with the scope)
to
\
position of the
WAVEFORM
selector switch,
SW2,
see
Figure
4-4.
18.
Adjust
the
triangle
amplitude
to
±1.25
V
±5
mV,
using
R12
and R23,
see
Drawing
142-010.
4.2.6
Sine Distortion
19.
Set
FREQ
HZ
to
X
100,
VERNIER
to
CAL,
WAVE-
FORM
SELECTOR
to
SINE,
FREQ
DIAL
to
10,
and
OUTPUT ATTEN
to
0
dB.
20.
Set
30
V
P-P
MAX
control to
3/4ths
of
full
CW,
and connect
oscilloscope
probe
to
^
position of
the
WAVEFORM
selector
switch (SW2),
see
Figure
4-4.
21.
Adjust
R153
so that
the
dc
offset
of the
sine
ampli-
fier
is
zero.
22.
Connect
the
test
equipment
as
shown
in
Figure
4-1,
and
adjust
R159, R168, and R 145
for
minimum
sine
wave
distortion.
Figure
4-1
-
Distortion Analysis
Test
Set-Up
23.
Set
FREQ
HZ
to
X
IK
and
readjust
R159, R168,
and
R
1
45
for
optimum
sine distortion.
24.
Set
FREQ HZ
to
X
100 and
readjust
R159, R168,
and
R145
if
necessary
25.
Alternately
perform
steps
24
and 25
until
the
least
amount
of
sine
wave
distortion
is
obtained
on
both
ranges
—
typically
.14%.
26.
Adjust
R165
for a 2.5
V
p-p
signal
output from
the
sine
amplifier
±25
mV.
27.
Readjust
R153
so
that the
dc
offset
of the
sine
amplifier
is
0
V
±5
mV.
28.
Connect
the
Spectrum
Analyzer
as
shown
in
Figure
4-2,
and check
the
sine
wave
distortion
at
frequencies
higher
than
600
kHz.
If
distortion
does not
meet
the
specification,
check
calibration
of
C95,
follow proce-
dure
4.2.10.
Figure 4-2
-
Spectrum
Analysis Test
Set-Up
4-3
7/71
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