INTRODUCTION
The B & K-hecision Model 1635 DC Power Supply is a
high quality, general purpose dc power source. It provides
0-30 volts dc output, adjustable with both coarse and fine vol-
tage controls for precise settabiiity. The current output is
0-3 amps. A three station pushbutton assembly allows the
Iarge panel-mounted LED meter dispiay to monitors either
the output current, output voltage, or a voltage (up to 199.9
volts) applied to the external metering inputs. LED's indicate
voltage or current metering.
The Model 1635 exhibits excellent regulation ard 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 func-
tional. The mechanical configuration conserves bench space
and allows for easy portability.
This instrument may be used in constant voltage or
constant current applications. The crossover from constant
voltage to constant current modes is smooth arld automatic.
LED's indicate the nCV" (constant voltage) or nCCn (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 resulates
output current rather than output voltage. Current limits a.re
adjustable from 570 to 100% of maximum. In constant cur-
rent 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 weli as the power supply.
The output is isolated from chassis and earth ground,
which permits full flexibility of connections. When needed,
ttre (+) 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-60 volt power soulce, or
two supplies may be connected in parallel, with suitable
balancing resistors, for up to twice the output current.
This power supply is well suited for a wide variety of
electrical and eiectronics applications, including service
shops, engineering labs, production testing, school laborator-
ies, and home use by hobbyists.
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