1. INTRODUCTION
Adjustable DC power supply are designed to be used in applications such as powering
operational amplifier, push pull stages, logic circuit and definition systems where plus and
minus voltages are required to track with an insignificant error, and in any application
where three independent power supplies housed in a single package represent an operating
convenience.
The instruments consist of two identical, independently adjustable and one fixed 5V/3A
DC power supplies. A front panel switch selects one of three modes of operation:
independent, series and parallel. In the independent mode, the output voltage and current of
each supply are controlled separately, and each supply is isolated up to 300V from output to
chassis or output to output .In the tracking mode, both outputs are automatically connected
in series or parallel, and the controls of the left supply adjust the magnitudes of both the
positive and negative output voltages. Because the outputs are connected in a tracking
configuration, any internal disturbance in the master supply (such as drift or ripple) will
cause an equal percentage change in the outputs of both the supplies.
Each power supply is a completely transistorized, well-regulated, constant
voltage/constant current supply that will furnish full rated output voltage at the maximum
output current or can be continuously adjusted throughout the output range. The front
panel current controls can be used to establish the output current limit (overload or shout
circuit) when the supply is used as a constant voltage source (independent or tracking modes)
and the voltage controls can be used to establish the voltage limit (ceiling) when the supply is
used as a constant current source(independent mode only).The supply will automatically
cross over from constant voltage to constant current operation(current limited operation in
the tracking mode) and vice versa if the output current or voltage exceeds these preset
limits. Each supply had its own front panel meter that can measure output voltage and
current. One power supply may be used as a master supply controlling, one slave supplies
furnishing various voltages or current for a system. When operated with the front panel
mode switch in the tracking position, the instrument is automatically internally connected in
auto-tracking configuration.
Another feature of this instrument is its output ON/OFF key.
a. For model A/B, it is only the key to cut off or resume the output as other similar
instrument.
(3) Parallel Tracking Operation
In the parallel tracking mode of operation, both supplies are strapped together (in
parallel). This allows for a rating voltage supply with a double rating current capability.
Only the MASTER output terminals are used for parallel tracking operation. In the parallel
tracking mode, the SLAVE supply output voltage and current are tracking the MASTER
supply output voltage and current.
A. Set the power supplies to the TRACKING PARALLEL mode by engaging both
Summary of Contents for Precision AC- DC Power Supply
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