EQUIPMENT
BEING
POWERED
NO. 2 (3
V)
POWER
NO. 2
POWER
NO. 2
POWER
NO. 1
POWER
NO. 2
SUPPLY
(15
V)
SUPPLY
(10
V)
Figure 6. Using Two Power Supplies for Two Output Voltages (Typical Examples1
USING
THE POWER SUPPLY
AS A BATTERY CHARGER
The power supply can be used as a battery
charger to restore the charge in rechargeable bat-
teries such as lead-acid, nickel-cadmium and some
alkaline types. Refer to the battery manufacturer’s
charging specifications for proper voltage and cur-
rent settings. Charging information is often printed
on the batteries. For batteries that specify maximum
charge currents of less than 2 amperes, set the cur-
rent limit to the specified value. For batteries with
higher charge current capacities, set the current
limit to maximum. The charging current of a bat-
tery is highest when the charger (power supply) is
initially connected.
As a result, current overload
can occur before voltage is brought up to specified
charging voltage. If this happens, reduce the power
supply voltage slightly so the power supply does
not shut down. After a period of time, increase the
voltage until the full charge value can be obtained
without shutdown.
OTHER SERVICING APPLICATIONS
The instrument can be used as
a bias supply to
test the effects of varying the dc bias, such as the
AGC bias in a television receiver. Typically, the
equipment being tested contains its own power sup
ply and operates from ac power. DC voltages are
present in the circuits.
The power supply is floated
from an appropriate point in the circuit, such as the
emitter of a transistor. The power supply output is
then
applied
to another point, such as the base of
that transistor. Varying the power supply voltage
then varies the dc bias on that stage,
and
the effects
POWER SUPPLY
#l
POWER
SUPPLY
#2
Figure 7. Two Power Supplies in Series
for Cl-100 Volt Output
may be noted.
A series limiting resistor is often
used to protect circuits from overdissipation.
ELECTRONICS MANUFACTURING
In electronics manufacturing, the power supply is
most often used as a dc power source to test
completed units for proper operation and compli-
ance with specifications.
The
instrument could also
be used in incoming inspection to test purchased
equipments or subassemblies. The use of the power
supply for testing complete units is very similar to
that previously described for servicing battery op
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