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BRUEL & KJAER 2209 - Page 14

BRUEL & KJAER 2209
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Fig.2.2. Rear view
of
2209
OUTPUT
ATTENUATOR
(Transparent
knob)
Controls
the
effective gain
of
the
output
amplifier.
To
protect
the
output
amplifier against overload and
to
ensure
the
optimum
signal
to
noise ratio,
the
transparent
knob
should
be
kept
at
its fully clockwise limit as
far
as
possible.
ATTENUATOR SCALE
Attenuator
scales are interchangeable
and
are accessible
by
unscrewing
the
coin
slotted
screw in
the
centre
of
the
attenuator
knobs. With a
properly
calibrated
meter,
the
number
between
the
two
red lines marked
on
the
transparent
knob plus
the
meter
deflection gives
the
correct
result
of
a
sound
level measurement. With vibration
and
voltage measurements,
the
number
between
the
two
red I ines gives
the
full scale
deflection
of
the
Meter.
GAl N ADJUSTMENT
A screwdriver
operated
potentiometer
controlling
the
gain
of
the
input
amplifier, used for matching
the
amplification
of
the
Meter
to
the
sensitivity
of
the
transducer.
12

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