EasyManua.ls Logo

Akai GXC-750

Akai GXC-750
60 pages
To Next Page IconTo Next Page
To Next Page IconTo Next Page
To Previous Page IconTo Previous Page
To Previous Page IconTo Previous Page
Loading...
il.
MEASURING
METHOD
1.
TAPE
SPEED
DEVIATION
Frequency
Counter
Line
GXC-75D
Output
Input
Fig.
2
As
shown
in
Fig.
2
connect
a
Frequency
Counter
to
the
Line
Output
of
Model
GXC-75D.
Playback
a
1,000
Hz
pre-recorded
test'tape.
Take
a
Frequency
Counter
reading
at
the
biginning,
middle,
and
end
of
tape
winding
during
playback,
and
obtain
the
tape
speed
deviation
from
the
following.
formula.
TAPE
SPEED
DEVIATION
(%)
=
Frequency
counter
reading
(Hz)
-
1,000
Hz
1,000
Hz
sa
2.
WOW
AND
FLUTTER
Line
input
W
d
GXC-75D
(Output
ne
Aine
aces
Fig.
3
Method
A
As
shown
in
Fig.
3,
connect
a
Wow
and
Flutter
Meter
to
the
Line
Output
of
Model
GXC-75D.
Playback
a
3,000
Hz
pre-reocrded
test
tape
and
take
a
Wow
and
Flutter
reading
at
the
beginning,
middle,
and
end
of
tape
winding
during
playback.
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
the
resultant
signal.
Measure
Wow
and
Flutter
with
a
Wow
and
Flutter
Meter,
(The
Wow
and
Flutter
value
of
method
B
will
be
close
to
\/2
times
of
method
A.)
3.
FREQUENCY
RESPONSE
Audio
Frequency
Oscillator
output
input
GXC-75D
High
Sensitivity
V.T.V.M.
Fig.
4
For
measuring
Frequency
Response,
connect
instru-
ments
as
shown
in
Fig.
4
and
proceed
as
follows.
1)
Supply
a
1,000
Hz
sine
wave
signal
to
the
Line
Input
of
Model
GXC-75D
from
an
Audio
Frequ-
ency
Oscillator
through
an
Attenuator.
2)
Set
Deck
to
recording
mode
and
turn
recording
level
control
to
maximum.
Adjust
Attenuator
to
obtain
a
0
dBm
High
Sensitivity
V.T.V.M.
reading.
3)
Under
conditions
described
in
2)
above,
readjust
Attenuator
so
that
the
Line
Output
is
-20
dBm,
and
record
50
to
13,000
Hz
spot
frequencies.
4)
Take
High
Sensitivity
V.T.V.M.
spot
frequency
readings
and
plot
the
values
on
a
graph.
NOTE:
When
measuring
Frequency
Response,
new
tape
should
be
used.
4.
SIGNAL
TO
NOISE
RATIO
7
aoe
GXC-75D
output
mput
High
Sensitivity
|
V.T.V.M.
Fig.
5
As
shown
in
Fig.
5,
connect
a
High
Sensitivity
V.T.V.M.
to
the
Line
Output
of
Model
GXC-75D.
Playback
a
250
Hz
OVU
pre-recorded
test
tape
and
measure
the
output
level.
Then
remove
the
tape
and
measure
the
noise
level
under
the
same
condition.
Convert
each
of
the
measured
values
into
decibels.

Table of Contents

Related product manuals