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5TUDER RÄ/OX
c,278
13
Q.a-"I.-i-E
r-a*t
i."s-"q
-.,-(-=*,t
e*n-de-{'d'.'"r*"e--v-"e*l
)
-."..".".-
--.
-*--
In the following paragraphs you will not {ind
anv
detäiled
instructisns
for
celibrating
or
recalibratinq your
machine
but only a definition
o'F
the
ct:m,nonly
used levels and measuring variables-
Detailed
infsrmatian
can
be
{ound
in
the
maintenance
manLral.
0 dFm
Thig level definition has
been
derived {rom the I
rnbl
power
level'
The
voltage droP across a
6O0
ohm
load is tr.773
V.
O
dFu(=O.775V) This leve1 corresponds to ä vol-
tage of
8.773V
without re{erence
to a load resistance'
O
dFv
{=1V}
dE
Line level
Operating
level
Tape
flux
This 1evel ctrrresponds to
a
voltaqe o{ I V without reference
to a load resigtance.
This designation does not
sPeci{Y
an ab=olute value bltt a ratio
between
two voltage=.
Def.: tdBl = ?0 lsg (Ul I
U2).
The line level. referg to the level
that is available ät the output of
a taFe recorder.
Corresponds
to a level that
produces
a ü
VU
reading on a
VU
rnster.
Speci*ies the magnetic +Iux of the
tape. In the
C?7E}
it is ?57
nhlb/m
for
O
dE er:tpr-tt
level.
The factory
ad-ir-r=ts
the C27A tape Fecr:rders tt:
the *ollowing values:
IECICCIR
- standard
NAB
- standard
Definition
Line
levEl
tdBml
VIJ-l'leter-readi
ng
tdBl
Tape
flux
nWb/m
Ref.
level
0
0
257
De{
i ni
ti
on
Line level
tdBml
VU-Meter-readi
ng
tdBl
Tape
+Iux
ntllb
/n
opereting
L
Peak Level
+4
+10
0
+6
237
514
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