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2.7
SIGNAL LEVEL AND OVERLOAD DETECTOR
The Model 535's
differential
input
amplifiers
are
capable
of
being driven
by
signals
up to
a
level
of
+20 dB
(Ref.
0.775 V rms),
above which clipping and
distortion
occurs.
The overload LED turns
on
when peak signals approach
the
clipping level, and
it
will remain
on long
enough
to
be
seen even
if
the
excess signal
is
only
a
brief
transient.
To
avoid audible distortion, when
the
LED indicator
flashes more than occasionally, either lower
the
output
level
of
the
source feeding the equalizer, or use an external attenuation
pad.
Because
of the
possible combination
of
control settings,
the
overload
is
monitored
at
several points
in
the
circuit:
1.
Input amplifier
(maximum signal
level +20 dB,
ref.
0.775
V rms).
2.
Filter amplifiers. which could
be
driven
into clipping
as
a
result
of
boost equalization.
3.
Output amplifier, which
is
capable
of
delivering
+24 dBm
into
a
600
-ohm
load (12.3 V rms), or +26 dBm*
into
a
150
-ohm load (7.75 V rms).
*NOTE: +26 dBm into 150 ohms
is
equivalent
to
+20 dB
referenced
to
0.775 volts, i.e., 7.75
V rms.
2.8
ACCESSORIES
A security cover
(SC -1)
may
be
installed over
the front panel
of
the
Model 535 only. This protects all controls from unwanted
adjustments.
Only
the
power switch remains accessible.
The smoke
gray plexiglas cover
is
transparent enough
to
allow viewing
of the
control settings.
The Model
301
adapter
is
available
for the use
of
XLR/QG connectors; two
are
needed for
the
Model
535.
2.9
RACK MOUNTING
A
MODEL
533
The
SR -21 kit (optional) allows
mounting
of
one 533
in
a
standard
19"
USASI rack.
The unit
occupies
two
standard spaces
(3-1/2" high).
The SR -21 kit should contain
the
following
items:
QUANTITY
DESCRIPTION
UREI PART
NUMBER
2
Rack Adapter Angles
25-12108
2
Rack Extensions
25-12109
4
#6-32 Oval Head Screws
4
#6
Lock Washers
4
#6-32 Nuts
4
#8-32 Pan Head Screws
4
#8
Lock
Washers
-8-
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