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1. INTRODUCTION
TP series 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 PS-303DU/305DU, it is only the key to cut off or resume the output as other similar instrument.
b. For model PS-2303/2305, it is not only the key to cut off or resume the output, but also be endowed with a
new function which its kindred has not. Also in this way, an over current by any unknown load can be avoided.
So the new function of the key is a safety design. Especially this feature is very important to the student use.
