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Akai 4000DS

Akai 4000DS
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II.
MEASURING
METHOD
1.
T
APE
SPEED
DEVIATION
1
Frequency
4000DS
counter
Line
output
input
Fig.
1
As
shown
in
Figure
1,
connect
a
Frequency
Counter
to
the
Line
Output
of
Model
4000DS.
Take
a
frequency
counter
reading
at
the
beginning,
middle,
and
end
of
tape
winding
during
playback.
The
maximum
value
of
these
respective
readings
will
represent
tape
speed
deviation.
2.
W
OW
AND
FLUTTER
Vl/fMii
•mil
1
4
lai#
1
nr
4000DS
>Y()W
cIlKJ
I
inner
Meter
input
Line
output
Fig.
2
Method
A
As
shown
in
Fig.
2,
connect
the
Line
Output
of
Model
4000DS
to
the
Input
of
a
Wow
and
Flutter
Meter.
Use
a
3,000
Hz
pre-recorded
test
tape
and
take
a
wow
and
flutter
meter
reading
at
the
beginning,
middle,
and
end
of
tape
winding.
The
maximum
value
of
these
respective
readings
will
represent
the
wow
and
flutter.
Method
B
Supply
a
3,000
Hz
sine
wave
signal
from
an
Audio
Frequency
Oscillator
and
make
a
recording
on
a
blank
tape
at
the
beginning,
middle,
and
end
of
tape
winding.
Rewind
and
playback
tape.
Measure
wow
and
flutter
with
a
Wow
and
Flutter
Meter.
(The
wow
and
flutter
value
of
Method
B
will
be
close
to
twice
that
of
Method
A.)
3.
F
REQUENCY
RESPONSE
Audio
Frequency
ollt
Oscillator
put
f
.
4000DS
Line
input
Line
output
ATT.
<
High
Sensitivity
V.T.V.M.
Fig.
3
For
measuring
frequency
response,
connect
instru¬
ments
as
shown
in
Fig.
3
and
proceed
as
follows:
1)
Supply
a
1.000
Hz
sine
wave
to
the
Line
Input
of
Model
4000DS
from
an
Audio
Frequency
Oscil¬
lator
through
an
Attenuator.
Set
recorder
to
re¬
cording
mode
and
turn
recording
level
volume
control
to
maximum.
Adjust
Attenuator
to
obtain
a
+4
dB
V.T.V.M.
reading.
2)
Under
conditions
described
in
I)
above,
re-adjust
Attenuator
so
that
the
Line
Output
is-16
dB,
and
record
40
to
20,000
Hz
spot
frequencies.
3)
Rewind
tape
and
playback
from
the
beginning.
Take
V.T.V.M.
spot
frequency
readings
and
plot
values
on
a
graph.
NOTE:
When
measuring
frequency
response,
new
tape
should
be
used.
4.
S
IGNAL
TO
NOISE
RATIO
4000DS
High
Sensitivity
Line
output
V.T.V.M.
Fig.
4
As
shown
in
Fig.
4,
connect
a
High
Sensitivity
V.T.V.M.
to
the
Line
output
of
Model
4000DS.
Playback
a
250
Hz
“O”
VU
pre-recorded
test
tape
and
measure
the
output.
Then
remove
the
tape
and
measure
the
noise
level
under
the
same
condition.
Convert
each
of
the
measured
values
into
decibels.

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