B&K Precision 1762 - Manual - Manual (Page 5)

5
INTRODUCTION
These B+K Precision Triple Output DC Power Supplies are high
quality, general purpose DC power sources. They provide two “main”
supplies and a “third” auxiliary output with a 4-6.5V (2-6.5V for
models 1761 & 1762) DC output. The “main” V supplies are adjustable
with both coarse and fine voltage controls for precise settability and are
capable of current output of 0-2A (0-3A for model 1761). The “third”
supply has a current output of 0-5A, allowing it to handle extensive
digital logic circuitry. Two large panel-mounted LED meter displays
can monitor either the output current or output voltage of each supply.
The two “main” volt supplies can be operated independently or in
one of two tracking modes. In the series tracking mode, the “B” Supply
tracks from 5% to 100% of the voltage of the “A” Supply. Maximum
current setting of the two supplies can still be set independently when
in the series tracking operating mode. In the series tracking mode the
“A” and “B” supplies are connected in series, allowing for double the
voltage setting. In the parallel tracking mode, the two supplies are
connected together in parallel, allowing for double the current setting.
Both “main” volt supplies 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.
The “third” V supply is ideal for powering digital logic
circuitry. The 0-5 amp capacity allows the supply to be used
for large circuits. Built-in overload protection automatically
limits the current output to a maximum of 5 amps. An
indicator lights when the supply is overloaded.
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.
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. Additionally, the two
“main” volt supplies can be used as a “split supply” with two
positive voltages and a common negative, two negative
voltages and a common positive, or one positive, one
negative, and a common. All of these configurations can be
used with either matching (tracking) or differing
(independent) voltages.