Teac A-6010GSL - Signal to Noise Ratio Check

50 100 600K eK S eoete
Fig.
7-4
Frequency
Response
Limits
-Playback-
0 mK PeiPK WOK 20K
Nite one
Fig. 7-5 Equalization Curves -Playback-
SIGNAL TO NOISE RATIO CHECK
NOTE:
Values
given
are
obtained
using
an
unweighted
level
meter
while
the
supply
and
take-up
motors
have
voltage
applied
but
are
not
rotating.
The
OUTPUT
control
should
be
at
specified
output
position.
1.
Thread
a
tape
on
the
unit,
leaving
the
tape
outside
the
capstan
and
pinch
roller.
Tension
arm
should
be
in
ON
position.
2.
Place
the
unit
in
the
PLAY mode
(
pb
)
(the
tape
will
not
move).
4.
The
level
meter
connected
to
the
LINE
QUT
jacks
should
indicate
as
listed
below.
vwvy v v
-56dB/7-1/2ips
-54dB/3-3/4ips
For example: -56 dB indicated corresponds
to a signal to noise ratio of 48 dB (dif-
ference between residual noise -56 dB and
the specified output level of -8 dB for
1% THD).
For a 3% THD signal to noise ratio, 6 dB
is
added,
giving
54
dB
(3%
THD
is
6
dB
—e
a
above
1%
THD
level).
Fig.
7-6
Signal
&
Noise—
Computation
7-4