Power Supply - BRUEL & KJAER 1022 Instructions And Applications
Beat frequency oscillator
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addition
to
the
volt calibration on
the
switch
ATTENUATOR
OUTPUT
there is
a1so a dB calibration, and
the
calibration
is,
as
mentioned
above,
given
in dB re. 1
volt. An example will explain
the u
se
of
the dB
scale:
If
the OUTPUT LEVEL
is
adjusted
in
such a
way, that
20
dB is read on
the meter
scale, and
the switch
ATTENUATOR
OUTPUT is in the
position
-
30 dB then the
signal
level
at
the
output
socket
will
be 20
-
30
=
-
10 dB
re. 1 volt
( o.316 V).
The signal-to-noise
ratio
of
the Oscillator is
greater
than 70 dB
for
maximum
output
voltage.
It
is independent
of
the
position of
the
attenuator, but some-
what dependent
on
the position
of
the potentiolffieter marked OUTPUT
LEVEL. The best
result
is
obtained when
the
voltmeter
has
a
deflection
around
20 dB.
Harmonic distortion is dependent
on
the
setting of
the OUTPUT LEVEL
potentiometer.
As
long
as
the
output
is kept within the meter range, the
distortion will be of the
order
indicated in
Fig.
1.3.
Power Supply.
The Oscillator
can be operated
from
a 240, 220,
150, 127, 115
or
100
volts AC
power
line, the
power consumption
being
about 60
watt
s.
The proper
voltage
is
selectable by a switch-fuse combination situated at
the rear
of
the instrument.
To select
the
voltage
it
is
necessary to
remove
the
fuse by turning the hexagonal
disc
head in the
centre of
th
e
switch
anti-
clockwise.
Then turn the head
of
the
voltage adjuster with a
coin until the
white mark is
aligned
with the required
voltage. The
fus
e
is th en replaced.
It
should
be noted that if
the aparatus
is to
be operated
from
a
DC power
line,
or from an accumulator, a vibrator
unit
or a
rotary
converter
is
required.
12
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