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(c)
Adjust
A3 R326
for a
voltage
of
-12
±0. 5
V.
(d)
Transfer
the
voltmeter
leads
to
A3
pin 5
and
7.
Ensure
that
the
voltage
is
+12
±0.
5
V,
,
u
(e)
Measure
the
voltage
between
A3
pin
4
and
7.
This
should
be +5
±0. 3 V,
•r
S.4.2
tevei
Zero Adjustment
(a)
Remove
the
lower
cover.
Set the
FUNCTION
switch
to
LEVEL
and
LEVEL RANGE
1
V.
(b)
With no
signal
applied
to the input adjust
Al RI 34
,ao
that
the
LEVEL METER
indicates zero.
5A3
Level
Gain
(a)
Test equipment
Low
distortion oscillator.
(b)
Set
the
FUNCTION
switch
to
LEVEL
and
LEVEL RANGE
to
1
V.
Apply
a
signal of
1
kHz,
1
V
r.
m.
s.
to the input
terminal.
(c)
Adjust
Al R119
so
that the
LEVEI.
METER
indicates
full
scale.
5.4.4
Distortion
Zero Adjustment
(a)
Test equipment
Low
distortion
oscillator.
(b)
Set
the
FUNCTION
switch
to
LEVEL,
the
LEVEL
RANG^E
tp
1
V
and
the
DISTORTION
RANGE
10 a
convenient
point.
(c)
Apply a
signal of
1
kHz
1
V
r.m.
s.
to
the
TF
2337A
input
terminals.
Adjust
Al R184
so
that the distortion
meter
reads
zero.
'
.'j
'
-
5.4.5
Distortion
Gain and
Ratio
Adjustment
(a)
Test equipment
Low
distortion oscillator.
(b)
Set
the
FUNCTION
switch
to
CAL.
,
LEVEL RANGE
to
1
V.
(c)
Apply
a
signal
of
1
kHz
1
V
r.m,
s.
to the input
terminals.
Adjust
R159
so
that the
distortion
meter
indicates
full
scale.
(d)
Set the
TF
2337A
LEVEL RANGE
switch
to 3
V,
Adjust
Al R176
so
that the
distortion
meter
again
iridicates
full
scale,
(e)
Repeat items
(b)
to
(d)
as
necessary
so
that the
distortion
meter
indicates
full
scale.
5.4.6
400
Hz
Band
Rejection
Filter
(a)
Test equipment
Low
distortion oscillator.
Co)
Press
the
CAL
and 400
Hz
filter
switches simultaneously,
(c)
Apply
a
signal
of 2
kHz
1
V
r.m.
3
.
to
the input
terminals
of the
TF
2337A.
Adjust
A2
R202
(400 Hz).
,
for
full
scale
deflection of the distortion
meter.
TF
2337A
27
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