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4.3.3
Band
Rejection
Filter
Pig.
4.
2
Fundamental
Rejection
Filter
check
(a)
Test equipment required
:
Low
distortion oscillator
,
Counter
(b)
Connect
the
TF
2337A
as
shown
in Fig.
4.2,
(c)
Set
TF
2337A
controls
as
follows
j-
Function switch
-
LEVEL
Level range
switch
-
IV
(d)
Connect
the output of
thelow
distortion oscillator
to the input of
the
TF
2337A.
<e)
Set the
frequency
of the
low
distortion oscillator
to
400
Hz
the level
meter
of the
TF
2337A
to
full
scale.
and,
varying
the output, set
-
(f)
Setthe switches
of the
TF
2337A
as follows
:
Function switch
-
400
Hz
'
'
Distortion
range switch-
0.1%
(g)
Vary
the
frequency
of
the
low
distortion
meter
so
that
the distortion
meter
of the
TF
2337A
indicates
0.
007%.
Check
the
frequency
at
two
points
(+
and
-)
of the
fundamental
frequency
to
confirm
that
the,
frequency
width
is
more
than ±3%:
(h)
Check
that
the
centre frequency
of the
two
points
noted
above
is
within
±1%
of
400 Hz.
i)
Select the
TF
2337A
controls as follows
:
-
Function switch
-
1,000 Hz.
i)
Sat the output
frequency
of the
low
distortion oscillator
to
1000
Hz
and, varying
the
frequency
set the
level
meter
of the
TF
2337A
to
full
scale.
k)
Select the
TF
2337A
controls
as
follows
-
Function switch
-
1000
Hz
Distortion
rar^e
switch
-
0.1%
l)
Cany
out
the
operation
described
in
para.
4. 3. 3(g).
Check
that the
centre frequency
of the
two
points
corresponding
to
0.007%
distortion
is
within
'
±1%
of
1000 Hz.
18
TF
2337A
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