+ 0.5 dB
0
-0.5
dB
+ 0.5 dB
0
-0
.5 dB
---
-
----
--
--
f-
I
Attenuator
I
----=
---
---
-
-
,
Attenuator
II
+
Typical value1
/"
/
r-/
t::::_---
--
~~
---~
"
/
/
.,...""L_
--
--~
b
~
......
,~
',
====
~
& K
r"ncel
± 0.2
dB
I
2
5 2 5
2
5 7 10
5
Hz
169126
Fig.4.11.
A ttenuator frequency characteristics
voltage (0.5 V
RMS
corresponding
to
meter fsd) may be
taken
for
tape
recorder,
level
recorder etc.
Note: 5 V
RMS
(fsd)
is
available with METER SWITCH
in
position
"Batt.
( Rec.)", see section 6.
1.
4.8. OUTPUT OVERLOAD INDICATOR
As mentioned
in
the
Introduction,
the
I
EC
extension
of
179 proposes
that
in
order
to
safeguard against harmonic distortion
due
to
overdriving
of
the
amplifier by signals with
too
high a peak value, overload indicators
should be placed
at
the
amplifier stage before
the
meter rectifier.
An
output
overload indicator
is
thus
fitted before
the
meter rectifier.
When it
flashes,
but
no overdeflection
of
the
meter needle occurs, it
indicates
that
the crest factor
of
the
signal
is
too
high for
the
instrument.
The indicator's operation
is
similar
to
that
of
the
input overload indicator.
36
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