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o)
The
accuracy
of the distortion
meter
should
be
^3%
of
reading
±3%
f.
s. d.
p)
Select
the
1000
Hz
push-button on
the
Function
switch.
q)
Set the
frequency
of the
low
distortion oscillator to
1000
Hz
and
that
of
the
voltage
calibrator
to
2,200 Hz.
Carry
out
checks
of
items
(c)
to
(n).
/J.3.6
Ratio Circuit
a)
Test equipment required
:
Low
distortion oscillator
Voltage
calibrator
Switch
box
b)
Connect
the
TF
2337A
as
shown
in Fig.
4.3.
c)
Carry
out the
operations
{c)
to
(k)
described
in
distortion
meter
accuracy
check, para.
4. 3.
d)
Vary
the
LEVEL RANGE
from
1
V
to 3
V, ensure
that
the indication
of
distortion
does
not
vary by
more
than ±
1%
of
f.
s, d,
e)
Select the
1
V
push-button on
the
Level Range.
f)
Set
the output
from
the voltage calibrator
to
0.
003 V.
g)
Vary
the
LEVEL RANGE
from
1
V
to 3
V, ensuring
that the indication of distortion
does
not
vary by
more
than
±
1%
of
f.
s.
d.
h)
Select the
1
V
push-button on
the
Level Rai^e.
'
i)
Set the
output
from
the voltage
calibrator
to
0.001 V.
J)
Vary
the
LEVEL RANGE
from
1
V
to 3
V,
ensure
that
the indication
of
distortion
does
not
vary by
more
than
±1%
of
f.
s.
d.
4.3.7
Input Resistance
a)
Test equipment required
:
Oscillator
Resistor
100
kQ ±1%
b)
Connect
the output of
the oscillator to the input
terminals
of the
TF
2337A.
c)
Set the controls of
the
TF
2337A
as
follows
Function switch
-
LEVEL
Level range switch
-
IV
d)
Set the output
frequency
of the
oscillator to
1
kHz.
TF
2337A
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