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APPENDIX
B
BASF
CALIBRATION
TAPE
NO.
15
The
Calibration
Tape
15
is
used
for
adjusting
magnetic
sound
equipment
at
15
ips
tape
seppd.
The
equalization
in
the
frequency
response
section
corresponds
to
50
+
3,180
us.
The
tape
consists
of
3
sections.
The
recordings
are
made
across
the
full
tape
width,
and
the
magnetization
vector
is
parallel
to
the
tape
edges.
Deviations
hereof
are
smaller
than
_+
3
minutes.
Tolerances
mentioned
below
refer
to
full
track
playback.
1.
Reference
Level
Section
When
playing
back
this
section,
the
reference
level
is
determined.
The
recorded
wavelength
corresponds
to
a
frequency
of
1,000
Hz
+
0.3%.
The
effective
tape
flux
in
magnetic
short
circuit
(see
DIN
45
200)
is
32
mIYIaxwell
+_5%,
for
1
mm
of
tape
width.
The
harmonic
distortion
of
the
recorded
signal
is
less
than
2%
The
duration
of
the
signal
is
approximately
30
s.
2.
Azimuth
Alignment
Section
This
section
serves
the
purpose
of
aligning
the
gap
of
the
playback
head.
Furthermore
it
is
used
for
approximate
determination
of
the
frequency
response.
Two
signals
are
recorded
on
this
section.
The
first
one
whose
wavelength
corresponds
to
a
frequency
of
1,000
Hz
lies
lOdB
below
the
reference
level.
Its
duration
is
approximately
8
s.
The
second
signal
whose
wavelength
corresponds
to
a
frequency
of
10,000
Hz
+.5^,
also
lies
lOdB
below
the
reference
level,
taking
into
consideration
the
tape
flux
diagram.
The
duration
of
the
signal
is
approximately
60
s.
The
gap
of
the
playback
head
is
aligned
by
adjusting
the
gap
position
during
playback
of
the
10,000
Hz
signal
until
the
output
voltage
reaches
a
maximum.
Simultaneously
the
variations
of
the
level
are
reduced
to
a
minimum.
The
equalization
of
the
playback
amplifier
is
correct,
when
the
playback
level
of
both
the
1,000
Hz
signal
and
the
10,000
Hz
signal
meet.
3.
Frequency
Response
Section
This
section
is
used
for
determining
and
adjusting,
point
by
point,
the
frequency
response
of
the
playback
amplifier.
The
following
frequencies
are
recorded
on
the
frequency
response
section:
1,000
-
31.5
-
40
-
63
-
125
-
250
-
500
-
1,000
2,000
-
4,000
-
6,300
-
8,000
-
10,000
-
12,500
-
14,000
-
16,000
-
18,000
-
1,000
Hz.
The
duration
of
each
signal
is
about
8
s
and
is
identified
by
a
preceding
announcement.
Deviations
from
the
nominal
frequencies
are
less
than
+
3%.
The
deviations
from
the
level
according
to
the
time
constant
curve
for
the
frequency
range
from
31.5
Hz
up
to
4,000
Hz
are
less
than
+_
0.5
dB
and
less
than
+_
IdB
for
the
frequency
range
from
6,300
Hz
up
to
18,000
Hz.
The
level
of
the
1,000
Hz
signal
lies
approximately
20dB
below
the
reference
level.
The
frequency
response
of
the
tape
flux
corresponds
to
the
impedance
of
a
parallel
combination
of
resistance
and
capacitor
with
a
time
constant
of
50
us
and
a
series
combination
of
resistance
and
capacitor
with
a
time
constant
of
3,180
us.
Each
frequency
starting
from
4,000
Hz
up
to
18,000
Hz
is
repeated
twice.