a.
b.
To reset the power supply, press and release
the
set/reset
button 4 . If the overload
condition was intermittent, this action will
restore operation.
If the OVERLOAD lamp 5 remains lighted,
use one of the three following
techniques
before resetting the power supply again:
-Reduce the load current.
-Reduce the voltage slightly with the
LEVEL control 13
.
-Increase the current limit slightly with the
SET CURRENT LIMIT control 3
.
If the
normal load current is unknown, this tech-
nique may be used; but, if the current limit
was already set for the maximum safe
load current, do not increase the current
limit further.
NOTE:
input which results in a surge current
when power is intially applied. When
powering such equipment, the overload
may activate when the STBY-DC ON switch
is placed in the DC ON position with full
operating voltage previously set. If this
occurs, reduce the voltage setting and
bring it up gradually to allow the capaci-
tors in the equipment to charge; this elim-
inates the surge current.
c. If the power supply continues to shut
down
at the correct current limit value, check the
LOAD current to determine the reason for
the overload.
9. To remove power from the load without dii
turbing the voltage or current limiting settings,
merely set the “STBY-DC ON” switch 7 in the
Some equipment has a highly capacitive
STBY position.
APPLICATIONS
GENERAL
This instrument may be used to power a vast
assortment of items in the fields of electronics serv-
icing, electronics manufacturing, electronics design
engineering and electronics education. The power
suply output is fully adjustable from
0
to 50 volts,
and 0 to 2 amperes. This flexibility makes it suitable
for most applications requiring a dc power source.
ELECTRONICS SERVICING
The electronics technician uses the power supply
as
the power source for much dc and battery
powered equipment being tested and serviced. It
may also be used as the power source for testing
modules or circuits that are removed from the equip
ment where it normally receives its power.
SERVICING BATTERY OPERATED EQUIPMENT
Most equipment which operates from internal bat-
teries can be tested and serviced using this power
supply as its power source. The excellent filtering
characteristics makes the power supply a suitable
substitute for batteries, with the added
advantage
that the effects of
varying
the voltage can be
checked. The following items are among the more
6
POKER SUPPLY
common types that may be powered from this
power supply:
Portable
AM or AM/FM radio receivers
Portable short wave and multi-band radio receivers
Portable paging receivers
Portable monitor receivers
Walkie
Talkie type transceivers
Portable two-way communications transceivers
Portable cassette recorders and players
Portable calculators
Other battery operated electrical or electronic
devices
CAUTION
Observe correct polarity. Some equipment
may not contain reverse polarity protec-
tion, and may be damaged if polarities are
reversed.
When servicing this type of equipment, remove
the batteries and connect test leads from the
(+)
and
(-)
terminals of the power supply to the
(+)
and (-)
power input points of the equipment being serviced
as shown in Figure 1. The earth ground terminal of
EQUIPMENT
BEING SERVICED
t
CURRENT LIMIT
Set VOLTAGE to the
to maximum
input
terminal voltage
value
of
fully
charged batteries.
Figure 1. Typical Power Supply Connections to
Battery Operated Equipment
COMPARTMENT
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