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Simpson 460 4 Series - Page 47

Simpson 460 4 Series
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Theory
of
Operation
DC
voltages
of
+12V,
—12V
and
+15V.
The
required
+5
volt
supply
is
provided
by
the
battery.
5.5.7
The
battery
is
charging
whenever
the
460D
is
connected
to
the
AC
line.
A
secondary
winding
from
Transformer
T,
and
the
associated
rectifier
provides
power
to
operate
a
constant
cur-
rent
source
for
charging
the
battery.
The
constant
current
source,
consisting
essentially
of
Z201
and
Q28,
provides
a
charging
current
of
approximately
400
milliamperes
when
the
Instrument
is
OFF.
Approximately
50
milliamperes
is
supplied
to
charge
the
battery
when
the
Instrument's
POWER
switch
is
set
to
ON.
5.5.8
When
the
460D
is
operated
with
AC
line
power
(no
bat-
tery
power)
the
battery-charging
constant
current
source
provides
the
+5V
supply
required
for
operation.

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