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BRUEL & KJAER 2305 - Power Supply Unit Configuration

BRUEL & KJAER 2305
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Power
Supply.
Rectifiers.
The
power
supply
section
of
th
e
apparatus
contains
two
full·
wave
and
two
half·wa
ve rectifiers.
One
of
the
full·wave
rectifiers supplies
the
DC
for
the
magnetic
clutch,
the
event
marking
arra
ngement,
and
the
lifting
magnet.
The
AC
ripple
of
thi
s
rectifier
is
us
ed to
dri
ve
th
e electro·
mec
hanical
chopper
in
th
e
Recorder
input
circuit.
The
output
voltage is
24
volts
and
is
also
available
at
th
e
7'pin
socket
for
re
mote
co
ntrol,
see
Figs.
1.9
and
2.3.
Ex
te
rn
al loads
placed
across
the
24
volts DC
should
not
draw
more
than
250
rnA')
of
curr
ent.
The
second
full·wave
re
ctifier
supplies
the
plate
voltage
to
all the amplifier
tubes
with
the
exception
of
the
tubes
in
the
DC
output
stage.
The
positive
reference
voltage
for
the
servo
system
is also
supplied
from
this
rectifier
and
stabilized
by
means
of
a
Zener
diode
.
Both
half·wave
rectifiers
are
supplied
from
the
same
section
of
the
trans
·
former
winding
and
act
as
a
type
of
voltage
doubling
circuit. One
of
the
half
·wave
rectifiers
supplies
the
positive
and
the
other
the
negative voltage
for
the
DC
output
stage. A
portion
of
the
negative voltage is stabilized
by
mea
ns
of
a
Zener
diode
and
supplies
the
negative
reference
voltage
for
the
bal
anced
servo
sy
stem
.
100 mV Ref.
The
input
reference
voltage
("100 mV Ref.")
for
sensitivity
calibration
of
the
Recorder
is developed
across
the
transformer
winding used
for
the
24
volts rectifier,
the
voltage being
amplitude
limited
and
stabilized
by
means
of
a
zener
diode. By
this
means
a
square
·wave signal is produced
and
the
input
reference
voltage will
vary
less
than
1 %
for
a
10
% variation
in
the
mains
.
Mains
Frequencies
and
Voltages.
The
apparatus
should
be
operated
from
a
50 Hz (cis) (or 60 Hz (cis)
as
specified)
power
line.
When
changing
the
Level
Recorder
from
50 Hz (cis)
to
60 Hz (ds)
or
vice
versa,
the
only
modification
to
be
carried
out
is
the
replacing
of
the
two
nylon
gear
wheels
"I"
and
"2"
by
oth
er
s (See
Fig
. 1.6).
For
more
details,
see
part
Op
era
tion,
page
37.
Adjustment
can
be
made
for
main~
voltages
of
100-
115-127-150
- 220
and
240
volts
by
means
of
a Voltage Selector
on
[be
top
plate.
The
power
consumption
is 115 W
(1
45
W
with
motor
running)
.
If
the
apparatus
is to
be
oper
ated
from
an
acc
umulator
or
from
other
types
of
DC supply, the
use
of
a DC/AC
converter
(for
50
or
60 Hz (cis)
resp
ectively) is nece
ssary
.
In
these
circumst
ances
it
should
be
noted
that
the
accuracy
of
the
various
mechanical
speeds
is de
pendent
on
the
fr
e
quency
of
the
power
supply
in
use.
*)
If
the
Level Recorder is also used to control
the
filter switch of the Spectrometer Type
2112,
the
Band·Pass
Filter
Set
Type
1612,
or
the
Turntable
Type
3921,
otber
external
loads must
not
load
the
24
volts supply by
more
than
50
rnA.
19

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