B&K Precision 1745A - Manual - Manual (Page 4)

INTRODUCTION
The B+K Precision Models 1744A &1745A DC Power
Supplies are high quality, general purpose dc power sources.
They provide 0-35 volts dc output, adjustable with both coarse
and fine voltage controls for precise settability. The current
output is 0-10 amps, adjustable with both coarse and fine current
controls (model 1745A). Two large LED meters continuously
monitor the output voltage and current (model 1745A). The
VOLTAGE meter is green, while the CURRENT meter is red
(model 1745A).
These models exhibit excellent regulation and low ripple
characteristics. The circuit design incorporates a pre-regulator,
which greatly reduces internal power dissipation at low output
voltages. The styling is both attractive and functional.
These instruments may be used in constant voltage or constant
current applications. The crossover from constant voltage to
constant current modes is smooth and automatic. LED’s indicate
the “CV” (constant voltage) or “CC” (constant current) mode of
operation. In constant voltage applications, a current limit may
be preset. When load variations cause the current to reach the
preset limit, the unit then regulates output current rather than
output voltage.
Current limits are adjustable from 5% to 100% of maximum.
In constant current applications, the maximum voltage may
be preset. When load variations cause current to drop below
the regulated value, the unit reverts to regulated voltage
operation at the preset value.
Reverse polarity protection prevents accidental damage to
the power supply from improper connection to an external
voltage, and current limiting protects the equipment being
powered, as well as the power supply.
The output is isolated from chassis and earth ground,
which permits full flexibility of connections. When needed,
the (+) or (- ) polarity may be strapped to ground, or either
polarity may be floated to an external voltage. Two supplies
may be connected in series as a 0-to- 70 volt power source, or
two supplies may be connected in parallel, with suitable
balancing resistor s, for up to twice the output current.
These power supplies are well suited for a wide variety of
electrical and electronics applications, including service
shops,
engineering labs, production testing, school
laboratories, and home use by hobbyists.
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