BK Precision 1715A, Instruction Manual

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APPLICATIONS
GENERAL
The Model 1715 power supply has a very wide variety of applications
in electrical and electronics servicing, engineering laboratories, manu­
facturing and testing facilities, schools, and home hobbying. The power
supply output is fully adjustable from0 to 60 volts and Oto 2 amps. This
flexibility makes them suitable for most applications requiring a de
power source.
ELECTRONICS SERVICING
Most electronics troubleshooting and repair is performed on a test
bench. This power supply can provide the de power source to operate a
module or circuit board on the test bench when it is removed from its
parent equipment. It can be used to power portable, battery-operated
equipment and check the effect of low battery voltage. It can power
vehicular equipment such as tape players, auto sound systems, CB radios,
etc. on the test bench.
Most automobiles and other vechicles use 12-volt electrical systems.
Although the electrical system is normally referred to as a 12-volt
system, actual battery voltage when fully charged is approximately 14
volts. The power supply may be set to 14 volts for servicing equipment
from vehicles with 12-volt electrical systems. Some trucks use a 24-volt
electrical system; bench testing of equipment from these systems should
be performed at 28 volts.
Some servicing applications require the injection of a variable de
voltage for certain tests, such as checking the effect of AOC bias in a
television receiver. This requires an isolated de power supply, such as
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the Model 1715. The equipment being tested may contain its own power
supply and operate from ac power. A de voltage may already be present
in the circuit. One polarity of the power supply output is floated to an
appropriate point in the circuit, such as the emitter of a transistor. The
other polarity of the power supply output is then applied to another point
in the circuit, such as the base of that transistor.Varying the power supply
voltage then varies the de bias on the stage, and the effects may be noted.
A series limiting resistor is often used to protect the circuits from
overdissipation.
ELECTRONICS MANUFACTURING
In electronics manufacturing facilities, the power supply is often used
as a de power source while testing and adjusting modules, subassemblies,
and complete units in the production and assembly area or in the quality
control area. The instrument can be used in incoming inspection as a de
power source for testing purchased components and subassemblies.
This power supply is particularly well suited for manufacturing appli­
cations because of its ease of operation and its continuous duty rating.
When load current or total power dissipation are among the main
characteristics to be measured, the total load cmTent and voltage are
easily displayed on the LED displays. The current limit can be set so that
all units which do not meet the load current specification will cause the
CC indicator to light, and the unit can be rejected.
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