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Technical appendix
Level definitions
Voltage level
OdBm (-O.775V)
OdBu (=O.775V)
Line level
Voltage reference level
Standard reference level
(operating level)
Calibration (standard level)
Yov tape recorder has been factory Jligned
I'xactly
10 Sllcclf
cations.
n 1he follOWing
p,1
rag raphs
you will no
t find any deta II ed I nSlruc-
tlons for
callbrut on or
recallbratlon of
your
machine but
only
a
definition of
the
common-
ly
used
levels and
measu6ng
varlabll.);;'
Deta;led
calibration InstruC".lons can
be
found
In
lila
service nstructions ior
tre
C270
tape
recorder (Older No.,
1O,30,0r120).
ThiS level
has
been
derived from the
1
mW
powe
r level In
any
load
resistance.
The
vol-
tage drop across
a 6000nm
load IS
0.775
V
ThiS
va
liige
15
defined
as
OdBm
(regardless
of
the
load).
This level
corresponds
~o
a voltage
of
0,
775
V
regardless
of
the 'oad
'csistance,
[d8uJ
15
oc-
caSionally
used In
p'Ii
C<l
of
the voltage
levd
[dBm].
The line level
'ders
to the level that IS
• available at the outpul of a tape record"!
when
a tape
With
reference Ilul<lVlly
IS
being
played,
or
• fed IntO the Input of
e
~ape
recorder when a
recording
produces reierence fluXIVlty
CClR
deslg ,-~tion
for line levp': this level
pro-
ducl.)
s
a
rc
"ding oi
°
dB
on
a quasI peak pro-
g'f1m
'neter (PPM)
A
tenn
commonly
used
I,
the
USA lor a
tape
flux
of
250
nWb/m
(:c
r recording
on
high-out-
put lapes) or
200
nWb/m (IOf
recording
on
standard
tapes):
thiS
level
produces
a
VU-
meter reading
of
OVU,
':1':1
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