Applications – B&K Precision 1745A - Manual User Manual

Page 21

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APPLICATIONS

ELECTRONICS DESIGN LAB

The technician or engineer working in an engineering laboratory

requires a dc power supply to power breadboard and prototype
circuits. This power supply is ideal because it monitors output
current, output voltage, limits current to protect the circuit, is
adjustable over a wide range, and has excellent regulation and very
low ripple.

Use of the instrument in an engineering laboratory is very

similar to that described for servicing electronics equipment and
modules, except that lower currents may be prevalent when
powering individual circuits. The current limiting feature is very
valuable in this application because it can protect unproven circuits
from damage.

ELECTRONICS EDUCATION

The student in an electronics curriculum may use the power

supply for

powering

equipment

and

circuits

as

previously

described for all other applications. In addition, the power supply
can be used in the classroom laboratory to conduct experiments in
f undamental electronics. In learning Ohm’s law, for example, the
relationships

of resistance, current,

and

voltage

are

easily

demonstrated by the use of a power supply. Being able to observe
both the current and voltage meter simultaneously is a great aid in
such experiments.

BATTERY CHARGING

The power supply can be used as a battery charger to

restore the charge in rechargeable batteries such as lead-acid,
nickel-cadmium, and some alkaline types. Refer to the
battery manufacturer’s charging specifications for proper
voltage

and

current

settings.

Charging

information

is

sometimes printed on the batteries. Battery charging, at least
initially, requires the constant current mode of operation.
Before connecting the power supply to the battery, preset the
VOLTAGE controls to the fully charged terminal voltage
specified by the battery manufacturer. Turn off the power
supply while connecting the battery. Observe proper polarity
and connect as for constant current operation. Adjust the
CURRENT control for the maximum charging current
specified by the battery manufacturer. (If the maximum
charging current is greater than the power supply’s maximum
load current, set the CURRENT control to maximum). The
CC indicator will light and the battery will charge at the
preset current limit. As the battery approaches full charge, its
terminal voltage will approach that of the power supply
output and the charging current will taper off. The power
supply may automatically switch to CV (constant voltage)
operation. When this occurs, the power supply will continue
to provide a trickle charge.

21

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