STUDER REVOX C274 - Calibration Level Definitions

sTUDtrR
Rd/OX
c274
13
In the following
päraqräphs
you
HilI
not
{ind any
detailed
in=tructionE
+or
calibration
or
recalibra-
tion
your
machine
but
onty
a definition
of
the
com-
monly used
levelg
and
meaguring
variables.
Detailed
information
cän
be
{ound
in the maintenance
manual.
_L_e.y-e.l-..!-"e*"f
..i.."rt.Lt-i..p_"D""e
B dEm
This level
definition
hä5
been
de-
rived
+rt:fi the
1 mlrl
Power
leveL.
The voltage
droP
across
a
608
shm
load is
A-775
V.
O
dBu
t= 0.775
Vi This
level corresponds
to a
vol-
tage
of 0.773
V without
reference
to a load
resistance-
I dFv
i=l V]
This level
corresponds
to
a vol-
tage
of I V
withor-rt
reference
to
a
load resigtance'
dE
This
designaticrn
does
not speci{y
an abgolute
value
but
a ratio
bet-
ween
tr+o voltages-
Def.:
tdFl
=
?O
1og
{U1 / U?1.
Line
level
Operating
Tatre
flux
The line
level
re{ers
to the
level
thet is
evailable
at
the
output
o+
a tape recorder.
level
Corresponds
to
a level
that
pro-
dt-tceg
a
O VU readinQ
on
a
VU me-
ter.
Specifies
the
magnetic
flux of
the
tape.
In the C?74
it
is 257
nl'fb/m
for
ü dB output
level.
The
{actory adjustg
the
C 274
tape recorderg
to
the
following
vaLt-les:
IEC,/CCIR standard
NAB
-
ständärd
De{
i ni ti
on
Line level
tdBml
Vu-meter
reading
tdBl
TäpP
{lux
ntllb/m
Reference
I evel
u
o
257
Def i ni ti on Line level
tdBml
VlJ-meter
reäding
rdBl
Tape
flux
nWb /m
Operating
L
Peäk Level
+4
+10
0
+6
2e7
514